摘要
为进一步提升协作通信系统的频谱效率,将重叠编码复用技术引入协作通信,设计了采用重叠编码的放大转发(ampli-fy-and-forward,AF)系统,并采用复数域的Viterbi解码算法对其进行译码。在平坦Rayleigh衰落信道下的仿真表明,通过改变不同的编码复用系数,新系统仅使用二阶调制就能使频谱效率高于1(b/s)/Hz。此外,在相同频谱效率下,较传统高阶调制AF协作通信系统,新系统的误比特率(bit error rate,BER)性能有显著提升,如当BER等于10-3时,新系统的每比特能量与噪声功率谱密度之比(Eb/N0)将减少6~7 dB。
Overlapped code division multiplexing (OVCDM)is applied in the cooperative communication system to improve the spectrum efficiency.A scheme combining amplify-and-forward (AF)cooperative communication system with OVCDM is pro-posed,and Viterbi algorithm in complex domain is used to decode it.The simulation under the flat fading Rayleigh channel shows that the spectrum efficiency of the proposed system is higher than 1 (b/s)/Hz only using binary modulation by changing different coding multiplexing coefficients.Furthermore,under the same spectrum efficiency,the bit error rate (BER)performance is im-proved significiantly compared with the high order modulation AF cooperative communication system.The energy per bit to noise power spectral density ratio (Eb/N0 )of the proposed system will decreases 6-7 dB when BER equals to 10-3 .
出处
《中国科技论文》
CAS
北大核心
2014年第10期1083-1086,共4页
China Sciencepaper
基金
陕西省教育厅科研计划项目(09JK598)
关键词
协作通信
放大转发
重叠编码
cooperative communications amplify-and-forward overlapped code division multiplexing