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将协作分集技术与正交频分复用(OFDM)技术相结合,研究了采用16QAM调制方式,基于OFDM系统的两种CRC和卷积码编码的协作通信。同时利用仿真分析了采用16QAM调制协作通信的两种解码转发与放大转发方案。也对比分析了CRC编码协作与卷积码编码协作的仿真性能,然后综合比较了DF、AF、CRC编码、卷积码编码协作通信的性能。仿真结果显示,基于CNV-OFDM的编码协作通信获得了显著的分集增益,系统性能得到了更大的提高。可见,CNV-OFDM的编码协作大大提高了无线通信系统的性能,降低了误码率。
Combining cooperative diversity technology and Orthogonal Frequency Division Multiplexing (OFDM) technology, cooperative communication based on 16QAM modulation scheme and two CRC and convolutional coding schemes based on OFDM system is studied. At the same time, two kinds of decoding forwarding and amplifying and forwarding schemes using 16QAM modulation cooperative communication are analyzed by simulation. The simulation performance of CRC encoding cooperation and convolutional code encoding is compared and analyzed. Then, the performance of DF, AF, CRC encoding and convolutional code encoding collaborative communication is comprehensively compared. The simulation results show that the CNV-OFDM-based coding cooperative communication achieves significant diversity gain and the system performance has been greatly improved. Can be seen, CNV-OFDM coding collaboration greatly improves the performance of wireless communication systems, reducing the bit error rate.