We study the impact of various modulation mapping strategies and signal constellation shapes on the se- crecy rates achievable with bit-interleaved coded modulation （BICM） schemes. Transmission over an ergodic Rayle...We study the impact of various modulation mapping strategies and signal constellation shapes on the se- crecy rates achievable with bit-interleaved coded modulation （BICM） schemes. Transmission over an ergodic Rayleigh fading channel is assumed throughout this work. Various constellations and mapping techniques are considered in this work to maximize the capacity difference between the main channel and the eavesdropper channel, rather than to opti- mize the capacity of both channels. We show that in terms of achievable secrecy rate, Gray and Quasi-Gray mappings only perform Well at low SNR but outperformed by other mapping techniques when SNR increases. The proper design of signal mapping can significantly enhance the achievable secrecy rate in BICM schemes. It is indicated that the key parameter to the secrecy rate of a BICM system is the distance spectrum of Euclidean distances for mappings.展开更多
Iterative demodulation and decoding scheme is analyzed and modulation labeling is considered to be one of the crucial factors to this scheme. By analyzing the existent mapping design criterion, four aspects are found ...Iterative demodulation and decoding scheme is analyzed and modulation labeling is considered to be one of the crucial factors to this scheme. By analyzing the existent mapping design criterion, four aspects are found as the key techniques for choosing a label mapping. Based on this discovery, a novel mapping design criteflon is proposed and two label mappings are searched according to it. Simulation results show that the performance of BICM-ID using the novel mappings is better than the former ones. The extrinsic information transfer （EXIT） chart is introduced and it is used to evaluate the proposed mapping design criteria.展开更多
为了研究Polar码在编码调制(CM)系统中的性能,提出了一种基于Polar码的比特交织编码调制(BICM)系统.分析了高斯白噪声(AWGN)信道中不同调制方式对系统误比特率(BER)性能的影响,并将所提系统的BER性能与基于低密度奇偶校验(LDPC)码的BIC...为了研究Polar码在编码调制(CM)系统中的性能,提出了一种基于Polar码的比特交织编码调制(BICM)系统.分析了高斯白噪声(AWGN)信道中不同调制方式对系统误比特率(BER)性能的影响,并将所提系统的BER性能与基于低密度奇偶校验(LDPC)码的BICM系统性能进行了对比.仿真结果表明,在QPSK调制下,基于Polar码的BICM系统与基于Polar码的无编码调制系统的BER曲线几乎完全重合;而在16QAM调制下,当码长较大时,基于Polar码的BICM系统较基于Polar码的无编码调制系统最大节省0.8 d B的比特信噪比.当信道编码码长为1 024、码率为0.5时,在中高比特信噪比区域上,基于Polar码的BICM系统可比基于LDPC码的BICM系统获得至少2 d B的比特信噪比增益.展开更多
文摘We study the impact of various modulation mapping strategies and signal constellation shapes on the se- crecy rates achievable with bit-interleaved coded modulation （BICM） schemes. Transmission over an ergodic Rayleigh fading channel is assumed throughout this work. Various constellations and mapping techniques are considered in this work to maximize the capacity difference between the main channel and the eavesdropper channel, rather than to opti- mize the capacity of both channels. We show that in terms of achievable secrecy rate, Gray and Quasi-Gray mappings only perform Well at low SNR but outperformed by other mapping techniques when SNR increases. The proper design of signal mapping can significantly enhance the achievable secrecy rate in BICM schemes. It is indicated that the key parameter to the secrecy rate of a BICM system is the distance spectrum of Euclidean distances for mappings.
文摘Iterative demodulation and decoding scheme is analyzed and modulation labeling is considered to be one of the crucial factors to this scheme. By analyzing the existent mapping design criterion, four aspects are found as the key techniques for choosing a label mapping. Based on this discovery, a novel mapping design criteflon is proposed and two label mappings are searched according to it. Simulation results show that the performance of BICM-ID using the novel mappings is better than the former ones. The extrinsic information transfer （EXIT） chart is introduced and it is used to evaluate the proposed mapping design criteria.
文摘为了研究Polar码在编码调制(CM)系统中的性能,提出了一种基于Polar码的比特交织编码调制(BICM)系统.分析了高斯白噪声(AWGN)信道中不同调制方式对系统误比特率(BER)性能的影响,并将所提系统的BER性能与基于低密度奇偶校验(LDPC)码的BICM系统性能进行了对比.仿真结果表明,在QPSK调制下,基于Polar码的BICM系统与基于Polar码的无编码调制系统的BER曲线几乎完全重合;而在16QAM调制下,当码长较大时,基于Polar码的BICM系统较基于Polar码的无编码调制系统最大节省0.8 d B的比特信噪比.当信道编码码长为1 024、码率为0.5时,在中高比特信噪比区域上,基于Polar码的BICM系统可比基于LDPC码的BICM系统获得至少2 d B的比特信噪比增益.
