网络-信道联合编码的DmF协作通信技术

提出了一种采用网络-信道编码的解调前传(DmF)协作通信方案.与译码前传(DF)相比,DmF协作方式在中继处只对信号进行解调而非译码,因此,大大降低了中继节点的复杂度.在由两个用户、一个中继节点和一个基站组成的通信模型中,采用LDPC信道编码与网络编码结合的方式,构造了一种DmF协作传输方式.在基站处,通过构造的H矩阵对来自两用户及中继的信号进行联合译码.仿真结果表明:所给方案的性能优于非协作方式及无网络编码的协作通信方式,随着信噪比的增加这种优势会更加明显;另外,DmF的性能与DF的非常接近,但其设备复杂度却大大降低,因此DmF比DF方式更具实用性.同时,该方案在降低设备复杂度、减少延迟、有效对抗无线信道慢衰落、提高通信性能及频谱利用率等方面都是非常有效的.

DmF Cooperative Communication with Joint Network-Channel Coding

A strategy of Demodulate and Forward (DmF) cooperation based on joint network channel coding in wireless communication is proposed. For DmF, the relay only performs demodulation instead of decoding, so there is lower complexity than Decode and Forward (DF). With the combination of network coding and the LDPC channel coding, DmF cooperative communication which comprises two users, a base station and a relay node in the cooperative uplink performs better. At the base station,a matrix [WTHX]H[WTBZ] is designed, which is used for decoding signals from two users and the relay jointly. Simulation results show that the proposed strategy outperforms that of the communication without cooperation and that of the cooperative communication without network coding. What is more, this advantage becomes more obvious as the signal to noise ratio(SNR) becomes larger,and the performance of DmF is almost close to that of DF with lower complexity, so DmF is more practical than DF. The proposed scheme is effective for reducing the complexity of equipment and delay, combating fading, improving communication performance, increasing spectrum efficiency in wireless communication systems.