摘要
将比特交织编码调制(BICM)技术应用于差分跳频(DFH)通信系统,在加性白高斯噪声(AWGN)信道及频率非选择性瑞利慢衰落信道下,对采用无迭代译码及迭代译码的系统比特误码率(BER)上界进行了理论推导及数值仿真验证,并与传统的差分跳频系统的性能进行了比较。其数值仿真结果表明:采用BICM技术的差分跳频系统,可以在不增加跳频带宽及译码复杂度的情况下,利用最优卷积码增大了其G函数网格图的最小自由距离。同时对于可用频率数为16的无迭代译码BICM/DFH,当BER为10-5时,在瑞利信道下相对于CHESS系统而言,其性能改善可达6dB。若采用迭代译码,则当BER为10-7时,其性能相对于无迭代译码可进一步改善3 dB。
The bit-interleaved coded modulation （BICM） technique is applied to the differential frequency hopping （DFH） system. Bit error rate （BER） upperbounds corresponding to noniterative decoding and iterative decoding are derived, over both the additive white Gaussian noise （AWGN） channel and the frequency nonselective Rayleigh fading channel. All the numerical results are verified via simulations. A comparisons has been made between the BICM/DFH system and the conventional DFH system, shouing that the application of B1CM allows the DFH system to in- crease the minimum free distance of its function G trellis by employing the optimum convolutional code without increasing the system bandwidth and decoding complexity. For the noniterative decoded BICM/DFH with 16 available frequencies, there is 6 dB performance improvement at the BER of 10-5 compared with CHESS over Rayleigh fading channels. When iterative decoding is used, the performance im- provement is 3 dB at the BER of 10-7 compared with noniterative decoding over Rayleigh fading channels.
出处
《电波科学学报》
EI
CSCD
北大核心
2009年第1期15-21,共7页
Chinese Journal of Radio Science
基金
国家自然科学基金资助项目(60672043)
