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Physical Layer Security for Satellite Optical Communication under Angle-of-Arrival Fluctuations 认领 引用
1
作者 He Jinyu Xu Guanjun +1 位作者 Song Zhaohui Zhang Qinyu 《China Communications》 SCIE EI CSCD 2026年第2期150-161,共12页
In this paper,we analyze the physical layer security(PLS)performance of a free-space optical(FSO)communication system composed of a transmitting satellite and ground users.Specifically,the FSO fading channels follow t... In this paper,we analyze the physical layer security(PLS)performance of a free-space optical(FSO)communication system composed of a transmitting satellite and ground users.Specifically,the FSO fading channels follow the Málaga distribution.Further,we scrutinize the influence of non-zero boresight pointing errors and angle-of-arrival fluctuations on the PLS performance for the first time.We derived the probability density function and cumulative density function of the FSO link,followed by the closed-form expressions of the secrecy outage probability(SOP)and the probability of strictly positive secrecy capacity(SPSC).The asymptotic SOP expression at the high signal-to-noise ratio regime and diversity order are also provided to reveal the physical mechanism of the PLS of the considered system.Finally,Monte Carlo simulation results are presented to verify the correctness of the analytical expressions.The results afford helpful insights for the future design of satellite FSO communication systems. 展开更多
关键词 angle-of-arrival fluctuations M´alaga distribution non-zero boresight pointing errors physical layer security satellite optical communication
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Evolution of Satellite Communication Systems Toward 5G/6G for 2030 and Beyond 认领 引用
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作者 Afang Yuan Zhihua Yang Zhili Sun 《Engineering》 SCIE EI CSCD 2025年第11期35-41,共7页
1.Introduction From the first-generation(1G)through the second-generation(2G)Global System for Mobile Communications(GSM),the third-generation(3G)wideband code division multiple access(WCDMA)to the fourth-generation(4... 1.Introduction From the first-generation(1G)through the second-generation(2G)Global System for Mobile Communications(GSM),the third-generation(3G)wideband code division multiple access(WCDMA)to the fourth-generation(4G)long-term evolution(LTE)wireless networks,terrestrial networks(TNs)have demonstrated significant success in increasing communication speeds and improving quality of service(QoS)for users. 展开更多
关键词 communication speeds G satellite communication evolution code division multiple access wcdma system mobile communications gsm networksterrestrial networks tns quality service
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An ISS-OFDM based adaptive filtering mechanism for interference suppression in wireless multi-hop communication network 认领 引用
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作者 秦丹阳 Ma Lin +1 位作者 Xu Renheng Ding Qun 《High Technology Letters》 EI CAS 2014年第3期230-236,共7页
The negative impact on communication performance in wireless multi-hop communication net-work caused by limited bandwidth,high bit eror rate （BER）,fading,noise and interference is alleviated by an adaptive filtering... The negative impact on communication performance in wireless multi-hop communication net-work caused by limited bandwidth,high bit eror rate （BER）,fading,noise and interference is alleviated by an adaptive filtering game based on frequency subbands selection and predetemined threshold.Such threshold is being obtained in Gaussian and multipath fading channel according to the frequency-matching principle and BER performance.The dynamic selection of subbands will obtain high use efficiency without the help of frequency hopping,and propound a new thought to improve band limited communication for wireless multi-hop communication network.The effectiveness of the adaptive filtering method has been verified by interleaving spread spectrum orthogonal frequency division multiplexing （ISS-OFDM） in different interference conditions,and the simulating results based on network simulator 2 （NS2） indicate that system BER can be improved greatly. 展开更多
关键词 multi-hop communication adaptive filtering interleaving spread spectrum orthogonal frequency division multiplexing （ISS-OFDM） interference suppression
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Performance analysis of hybrid carrier DS CDMA communication system 认领 引用
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作者 邱昕 沙学军 梅林 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2012年第4期77-82,共6页
A hybrid carrier (HC) DS CDMA communication system is proposed, combining 4-weighted fractional Fourier transform (4-WFRFT) with code division multiple access (CDMA) technique. The signals are modulated in a certain o... A hybrid carrier (HC) DS CDMA communication system is proposed, combining 4-weighted fractional Fourier transform (4-WFRFT) with code division multiple access (CDMA) technique. The signals are modulated in a certain order fractional Fourier domain and transformed by 4-WFRFT to compose the hybrid carrier signals. In the time domain CDMA technique is adopted for multiple accesses and time diversity gain. Compared to orthogonal frequency division multiplexing (OFDM) system, in which Fourier transform is adopted, the signal energy in HC system is distributed on the time-frequency plane more evenly and symmetrically. Thus, when there is a deep fading notch or single-frequency interference in the channel, the proposed method can split the interference to a broader range in order to reduce the influence, resulting in the better system performance. Moreover, the performances of the proposed system, such as peak-to-average power rate (PAPR) and security are also discussed in the paper. 展开更多
关键词 4-weighted fractional Fourier transform code division multiple access carrier scheme selective channel
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Identification of VC merging source during multipoint-to-point communication 认领 引用
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作者 ZOU Xinguang +1 位作者 JIA Shilou 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2002年第3期276-279,共4页
The VC merging algorithm is used widely for multipoint to point ATM communication. For AAL5 lacking multiplex ID field, the downstream receiving point cannot distinguish the multiplexed source in a multipoint to point... The VC merging algorithm is used widely for multipoint to point ATM communication. For AAL5 lacking multiplex ID field, the downstream receiving point cannot distinguish the multiplexed source in a multipoint to point VC after VC merging. So the source based rate distribution algorithms cannot work properly. We designed a source detection algorithm to enable the switch to know the number of sources and the cell rate of each source in a multipoint to point VC. These information is very important for the source based rate distribution algorithm. We used the ERICA algorithm in our simulations and the simulations demonstrated the proper operation of the source detection algorithm. 展开更多
关键词 multipoint-to-point, VC merging source detection, source based rate distribution
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Signal modeling of the OFDM-based fractional fourier domain communication system 认领 引用
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作者 迟永刚 张生昱 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2012年第3期10-14,共5页
In this paper,a new transmission scheme for Fractional Fourier Domain Transform Communication System(FrFDCS) based on OFDM is proposed,which can be potentially applied in transmitting control information in the cognit... In this paper,a new transmission scheme for Fractional Fourier Domain Transform Communication System(FrFDCS) based on OFDM is proposed,which can be potentially applied in transmitting control information in the cognitive radio(CR) network.The proposed system can take advantage of concentration property of non-stationary signals in fractional domain to obtain a better performance against Chirp like jammers.Meanwhile,Chirp format subcarriers of fractional domain OFDM can solve the orthogonality degradation in the traditional OFDM system,when it comes to the time-frequency-selective channel.The signal model is designed for the OFDM-based FrFDCS and the BER performance in the AWGN channel is analyzed and simulated as well. 展开更多
关键词 cognitive radio OFDM TDCS FrFDCS
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Secrecy Performance Analysis Considering Channel Correlation of MIMO Scenario in Physical Layer Security 认领 引用
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作者 Zhang Jiuning Wu Xuanli +3 位作者 Xu Zhicong Zhang Tingting Xu Tao Meng Xiangyun 《China Communications》 SCIE EI CSCD 2025年第6期276-290,共15页
Physical layer security is an important method to improve the secrecy performance of wireless communication systems.In this paper,we analyze the effect of employing channel correlation to improve security performance ... Physical layer security is an important method to improve the secrecy performance of wireless communication systems.In this paper,we analyze the effect of employing channel correlation to improve security performance in multiple-input multipleoutput(MIMO)scenario with antenna selection(AS)scheme.We first derive the analytical expressions of average secrecy capacity(ASC)and secrecy outage probability(SOP)by the first order Marcum Q function.Then,the asymptotic expressions of ASC and SOP in two specific scenarios are further derived.The correctness of analytical and asymptotic expressions is verified by Monte Carlo simulations.The conclusions suggest that the analytical expressions of ASC and SOP are related to the product of transmitting and receiving antennas;increasing the number of antennas is beneficial to ASC and SOP.Besides,when the target rate is set at a low level,strong channel correlation is bad for ASC,but is beneficial to SOP. 展开更多
关键词 average secrecy capacity channel correlation multiple-input multiple-output physical layer security secrecy outage probability
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Age-Optimal Cached Distribution in the Satellite-Integrated Internet of Things via Cross-Slot Directed Graph 认领 引用
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作者 Hu Zhouyong Li Yue +1 位作者 Zhang Hanxu Yang Zhihua 《China Communications》 SCIE EI CSCD 2025年第6期300-318,共19页
In the Satellite-integrated Internet of Things(S-IoT),data freshness in the time-sensitive scenarios could not be guaranteed over the timevarying topology with current distribution strategies aiming to reduce the tran... In the Satellite-integrated Internet of Things(S-IoT),data freshness in the time-sensitive scenarios could not be guaranteed over the timevarying topology with current distribution strategies aiming to reduce the transmission delay.To address this problem,in this paper,we propose an age-optimal caching distribution mechanism for the high-timeliness data collection in S-IoT by adopting a freshness metric,as called age of information(AoI)through the caching-based single-source multidestinations(SSMDs)transmission,namely Multi-AoI,with a well-designed cross-slot directed graph(CSG).With the proposed CSG,we make optimizations on the locations of cache nodes by solving a nonlinear integer programming problem on minimizing Multi-AoI.In particular,we put up forward three specific algorithms respectively for improving the Multi-AoI,i.e.,the minimum queuing delay algorithm(MQDA)based on node deviation from average level,the minimum propagation delay algorithm(MPDA)based on the node propagation delay reduction,and a delay balanced algorithm(DBA)based on node deviation from average level and propagation delay reduction.The simulation results show that the proposed mechanism can effectively improve the freshness of information compared with the random selection algorithm. 展开更多
关键词 age of information cached distribution satellite-integrated internet of things time-varying graph
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Performance of Physical-Layer Network Coding in Asymmetric Two-Way Relay Channels 认领 引用 被引量：4
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作者 李博 王钢 +3 位作者 Peter H.J.Chong 杨洪娟 Yongliang GUAN 沙学军 《China Communications》 SCIE CSCD 2013年第10期65-73,共9页
In this paper, we study the performance of physical-layer network coding in asymmetric two-way relay channels using four different cases having different poor channels:phase asymmetry, downlink asymmetry, uplink asymm... In this paper, we study the performance of physical-layer network coding in asymmetric two-way relay channels using four different cases having different poor channels:phase asymmetry, downlink asymmetry, uplink asymmetry and node asymmetry. The decision and mapping rule for symmetric and asymmetric cases are studied. The performance in terms of bit error rate for each case will be studied and analysed by computer simulation. Analytical and simulation results show that uplink asymmetry is the worst case;intra-phase asymmetry and unreliable uplink channels will more severely affect the performance degradation, which is caused by channel asymmetry. 展开更多
关键词 physical-layer network coding two-way relay channels asymmetric channels bit error rate
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UWB channel modeling for indoor line-of-sight environment 认领 引用 被引量：6
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作者 汪洋 许洪光 +1 位作者 张钦宇 张乃通 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2007年第6期866-870,共5页
SV/IEEE 802.15.3a model has been the standard model for Ultra-wide bandwidth (UWB) indoor non-line-of-sight (NLOS) wireless propagation,but for line-of-sight (LOS) case,it is not well defined. In this paper,a new stat... SV/IEEE 802.15.3a model has been the standard model for Ultra-wide bandwidth (UWB) indoor non-line-of-sight (NLOS) wireless propagation,but for line-of-sight (LOS) case,it is not well defined. In this paper,a new statistical distribution model exclusively used for LOS environment is proposed based on investigation of the experimental data. By reducing the number of the visible random arriving clusters,the model itself and the parameters estimating of the corresponding model are simplified in comparison with SV/IEEE 802.15.3a model. The simulation result indicates that the proposed model is more accurate in modeling small-scale LOS environment than SV/IEEE 802.15.3a model when considering cumulative distribution functions (CDFs) for the three key channel impulse response (CIR) statistics. 展开更多
关键词 UWB line-of-sight indoor propagation channel multipath statistical model
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Analysis on Connectivity of Inter-Orbit-Links in a MEO/LEO Double-Layer Satellite Network 认领 引用 被引量：5
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作者 王振永 李集林 +1 位作者 郭庆 顾学迈 《Chinese Journal of Aeronautics》 EI CAS 2006年第4期340-345,共6页
As an important scheme of future global mobile satellite communication systems to provide multimedia service, a Double-Layer Satellite Network （DLSN） with MEO satellites and LEO satellites is proposed. The Inter-Orb... As an important scheme of future global mobile satellite communication systems to provide multimedia service, a Double-Layer Satellite Network （DLSN） with MEO satellites and LEO satellites is proposed. The Inter-Orbit-Links （IOLs） between layers is an essential factor, which affects the performances of the DLSN systems. Considering certain constellation parameters, the geometric characteristics of IOLs are described and the connectivity of MEO satellites and LEO satellites in the DLSN is analyzed. By computer simulation, the results show that IOLs should be selectively established according to certain parameters rather than the simple in-sight principle. 展开更多
关键词 double-layer satellite network MEO/LEO inter-orbit-links connectivity
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Detection Performance Analysis of Spectrum Sensing in Cognitive Radio Networks with Mobile Secondary Users 认领 引用 被引量：2
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作者 Xinyu Wang Min Jia +2 位作者 Qing Guo Xuemai Gu Jian Yang 《China Communications》 SCIE CSCD 2016年第11期214-225,共12页
The majority of existing papers about spectrum sensing have the assumption that secondary users(SUs) are stationary. However,mobility is an essential feature of mobile communications networks. In this paper,the detect... The majority of existing papers about spectrum sensing have the assumption that secondary users(SUs) are stationary. However,mobility is an essential feature of mobile communications networks. In this paper,the detection performance of spectrum sensing by mobile SUs was analyzed. Three performance metrics,i.e.,detection probability,miss detection probability and false alarm probability,were thoroughly investigated. In our analysis,a critical variable was the real-time received primary user signal power by a mobile SU. Its probability distribution and mathematical expectation were analytically derived. Moreover,the three performance metrics in single-node spectrum sensing and multi-node collaborative spectrum sensing systems were also derived. Extensive simulations were performed. The results are consistent with the theoretical analysis. And it is concluded that SU mobility has a significant impact on the detection probability and the miss detection probability,but not on the false alarm probability. 展开更多
关键词 cognitive radio spectrum sensing mobility random variable analysis probability density function
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Joint resource allocation for MIMO-OFDM video transmission systems with unequal error protection 认领 引用 被引量：4
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作者 张成文 刘鑫 谭学治 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2012年第2期119-124,共6页
To improve the performance of MIMO-OFDM video transmission systems on the limitation of wireless bandwidth and transmitting power,we propose an adaptive joint resource allocation algorithm with unequal error protectio... To improve the performance of MIMO-OFDM video transmission systems on the limitation of wireless bandwidth and transmitting power,we propose an adaptive joint resource allocation algorithm with unequal error protection(UEP) based on joint source-channel coding(JSCC) according to H.264 video compression standard and RCPT channel coding.According to different thresholds of the average SNR of subchannels,the algorithm dynamically allocates the source coding parameters of original video data and the channel coding parameters of RCPT,which realizes UEP for the compressed video data of different importance.Through the bit and power allocation based on MQAM modulation and the subspace allocation based on beamforming technology for different subcarriers,an adaptive joint resource allocation making full use of space-frequency domain resources have been realized.The simulation results indicate that the algorithm improves the adaptability of video transmission systems in different wireless environments and the quality of video retrieval. 展开更多
关键词 video transmission MIMO-OFDM unequal error protection joint source-channel coding
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Guaranteeing Wireless Communication Secrecy via a WFRFT-Based Cooperative System 认领 引用 被引量：19
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作者 Fang Xiaojie Sha Xuejun Mei Lin 《China Communications》 SCIE CSCD 2015年第9期76-82,共7页
In this paper, a weighted fractional Fourier transform(WFRFT) based cooperative overlay system, aiming to guarantee physical layer(PHY) security, is proposed. The paper elaborates how WFRFT and physical layer properti... In this paper, a weighted fractional Fourier transform(WFRFT) based cooperative overlay system, aiming to guarantee physical layer(PHY) security, is proposed. The paper elaborates how WFRFT and physical layer properties of the wireless medium are collaborated to guarantee the secrecy of wireless transmissions. In the proposed system, WFRFT is first preform on the secret data, such that the transmitted signal is distorted and can only be neutralized by inverse-WFRFT with the same parameter. And then two streams of the transformed sequences that bearing different messages are cooperatively and simultaneously transmitted to two legitimate receivers via a beamforming-liked method, respectively. In general, both the rapid spatial decorrelation property and the inherent security features of WFRFT are leveraged, such that only the eavesdropper's is degraded, and hence, the wireless communication secrecy is reliably guaranteed. Numerical simulations are conducted to evaluate the performance of the proposed system in terms of the average bit error rate and the secrecy capacity. 展开更多
关键词 weighted fractional Fourier trans-form（WFRFT） physical layer（PHY） security secrecy capacity
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Exhaustive entropy based SLM method for PAPR reduction of OFDM system 认领 引用 被引量：1
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作者 宁磊 王振永 +2 位作者 潘晶 杨明川 郭庆 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2012年第2期91-97,共7页
Orthogonal frequency division multiplexing(OFDM) is an attractive technology to provide immense improvement in wireless transmission capacity but high peak-to-average power ratio(PAPR) is a major drawback of OFDM syst... Orthogonal frequency division multiplexing(OFDM) is an attractive technology to provide immense improvement in wireless transmission capacity but high peak-to-average power ratio(PAPR) is a major drawback of OFDM system.Selected mapping(SLM) scheme has good performance for PAPR reduction.It requires the transmitting data to be multiplied by random phase sequences.However,the sequences are pseudo-random which will decrease the method effectiveness.Exhaustive entropy is introduced in this paper which can identify the strength of random phase sequences property.Then an exhaustive entropy based on SLM method is proposed.The scheme improves the effectiveness of random phase sequences by selecting the larger exhaustive entropy of them.The simulation results show that the PAPR reduction performance is better than that of conventional SLM through this method. 展开更多
关键词 exhaustive entropy orthogonal frequency division multiplexing(OFDM) peak-to-average power ratio(PAPR) selected mapping(SLM)
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Performance analysis of amplify-and-forward cooperative diversity with multiple-antenna nodes via analog network coding 认领 引用 被引量：1
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作者 杨洪娟 孟维晓 李博 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2012年第6期13-16,共4页
Network coding (NC), which works in the network layer, is an effective technology to improve the network throughput, by allowing the relay to encode the information from different users and ensuring the destination to... Network coding (NC), which works in the network layer, is an effective technology to improve the network throughput, by allowing the relay to encode the information from different users and ensuring the destination to retrieve the desired information. Employing network coding technique in a cooperative network can improve the network performance further. In this paper, we introduce analog network coding (ANC) to a simple two-user cooperative diversity network, which adopts amplify-and-forward (AF) mode and all nodes use multiple antennas. The impact of the number of antenna on the system achievable rate is investigated. And the bit error rate (BER) performances of the traditional relay cooperative network and the cooperative network based on analog network coding under different propagation conditions are discussed. The simulation results show that the performance of the traditional cooperative network has improved significantly due to the employ of network coding. 展开更多
关键词 cooperative diversity amplify-and-forward multiple antennas network coding analog network coding
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Mathematical Modeling and Design of RIS Deployment in a RIS-Assisted Metal Cuboid for WAIC Systems 认领 引用 被引量：1
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作者 Hongchi Lin Qiyue Yu 《China Communications》 SCIE CSCD 2023年第4期86-101,共16页
Wireless avionics intra-communications(WAIC)is an emergent research topic,since it can improve fuel efficiency and enhance aircraft safety significantly.However,there are numerous baffles in an aircraft,e.g.,seats and... Wireless avionics intra-communications(WAIC)is an emergent research topic,since it can improve fuel efficiency and enhance aircraft safety significantly.However,there are numerous baffles in an aircraft,e.g.,seats and cabin bulkheads,resulting in serious blockage and even destroying wireless communications.Thus,this paper focuses on the reconfigurable intelligent surface(RIS)deployment issue of RIS-assisted WAIC systems,to solve the blockage problem caused by baffles.We first propose the mirror-symmetric imaging principle for mathematically analyzing electromagnetic(EM)wave propagation in a metal cuboid,which is a typical structure of WAIC systems.Based on the mirror-symmetric imaging principle,the mathematical channel model in a metal cuboid is deduced in detail.In addition,we develop an objective function of RIS's location and deduce the optimal RIS deployment location based on the geometric center optimization lemma.A two-dimensional gravity center search algorithm is then presented.Simulation results show that the designed RIS deployment can greatly increase the received power and efficiently solve the blockage problem in the aircraft. 展开更多
关键词 wireless avionics intra-communications(WAIC) reconfigurable intelligent surface(RIS) channel modeling deployment optimization
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Dynamic Characteristics of Inter-Satellite Links in LEO Networks 认领 引用 被引量：1
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作者 王亮 张乃通 温萍萍 《Journal of Systems Engineering and Electronics》 EI 2003年第4期25-29,48,共5页
To establish an efficient inter-satellite link (ISL) in an LEO network, the effect of geometric characteristics of ISL on the ISLs and the devices on the LEO satellite should be examined. Because of the continuous mov... To establish an efficient inter-satellite link (ISL) in an LEO network, the effect of geometric characteristics of ISL on the ISLs and the devices on the LEO satellite should be examined. Because of the continuous movement of the LEO satellite, the time-varying behaviours of the ISL's geometric charactersistics continuously change with the changes of the satellite's position on the orbit. These dynamic geometric characteristics of the ISLs are important for ISL's performance analyzing and the design of the devices on the LEO satellite. This paper describes dynamic geometric characteristics of ISL, analyzes the impact of these regulations on the tracking system of the satellite's antenna and the power adjusting system of the satellite's transmitter, with the Iridium system as an example. 展开更多
关键词 inter-satellite link LEO constellation dynamic characteristics.
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A novel adaptive classification scheme for digital modulations in satellite communication 认领 引用 被引量：1
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作者 吴丹 Gu Xuemai Guo Qing 《High Technology Letters》 EI CAS 2007年第2期145-149,共5页
To make the modulation classification system more suitable for signals in a wide range of signal to noise ratios （SNRs）, a novel adaptive modulation classification scheme is presented in this paper. Differ-ent from ... To make the modulation classification system more suitable for signals in a wide range of signal to noise ratios （SNRs）, a novel adaptive modulation classification scheme is presented in this paper. Differ-ent from traditional schemes, the proposed scheme employs a new SNR estimation algorithm for small samples before modulation classification, which makes the modulation classifier work adaptively according to estimated SNRs. Furthermore, it uses three efficient features and support vector machines （SVM） in modulation classification. Computer simulation shows that the scheme can adaptively classify ten digital modulation types （i.e. 2ASK, 4ASK, 2FSK, 4FSK, 2PSK, 4PSK, 16QAM, TFM, π/4QPSK and OQPSK） at SNRS ranging from 0dB to 25dB and success rates are over 95% when SNR is not lower than 3dB. Accuracy, efficiency and simplicity of the proposed scheme are obviously improved, which make it more adaptive to engineering applications. 展开更多
关键词 adaptive modulation classification support vector machine SNR estimation digital modulation
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Enhanced multiple access schemes for future broadband satellite communications 认领 引用
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作者 贾敏 顾学迈 郭庆 《Journal of Central South University》 SCIE EI CAS 2010年第1期117-122,共6页
A new structure of next generation integrated communication system was proposed, which is composed of space segment based on satellites and terrestrial segment. Moreover, the characteristics of enhanced multiple acces... A new structure of next generation integrated communication system was proposed, which is composed of space segment based on satellites and terrestrial segment. Moreover, the characteristics of enhanced multiple access schemes based on orthogonal frequency division multiplexing (OFDM) technique were analyzed for satellite links. However, OFDM is a doubtful candidate as its higher peak-to-average power ratio (PAPR) that causes the distortion of high power amplifier (HPA). Furthermore, different schemes were evaluated and compared in terms of the HPA nonlinearity and the link level performance in detail. And the pilot-aided channel estimation and equalization techniques were also considered for analyzing the problem. Simulation results show that the bit error rate (BER) and block error rate (BLER) performance of orthogonal frequency division multiple access (OFDMA) outperforms that of single carrier-frequency division multiple access (SC-FDMA) for the satellite links in the proposed structure, though discrete Fourier transform-spread OFDM DFT-S OFDM has low PAPR, especially the BER performance of OFDMA is 3.6 dB larger than that of SC-FDMA at the target BER. 展开更多
关键词 satellite orthogonal frequency division multiplexing discrete Fourier transform high power amplifier channel estimation
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