中国科技论文
中國科技論文
중국과기논문
Sciencepaper Online
2014年
10期
1083-1086
,共4页
协作通信%放大转发%重叠编码
協作通信%放大轉髮%重疊編碼
협작통신%방대전발%중첩편마
cooperative communications%amplify-and-forward%overlapped code division multiplexing
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。
為進一步提升協作通信繫統的頻譜效率,將重疊編碼複用技術引入協作通信,設計瞭採用重疊編碼的放大轉髮(ampli-fy-and-forward,AF)繫統,併採用複數域的Viterbi解碼算法對其進行譯碼。在平坦Rayleigh衰落信道下的倣真錶明,通過改變不同的編碼複用繫數,新繫統僅使用二階調製就能使頻譜效率高于1(b/s)/Hz。此外,在相同頻譜效率下,較傳統高階調製AF協作通信繫統,新繫統的誤比特率(bit error rate,BER)性能有顯著提升,如噹BER等于10-3時,新繫統的每比特能量與譟聲功率譜密度之比(Eb/N0)將減少6~7 dB。
위진일보제승협작통신계통적빈보효솔,장중첩편마복용기술인입협작통신,설계료채용중첩편마적방대전발(ampli-fy-and-forward,AF)계통,병채용복수역적Viterbi해마산법대기진행역마。재평탄Rayleigh쇠락신도하적방진표명,통과개변불동적편마복용계수,신계통부사용이계조제취능사빈보효솔고우1(b/s)/Hz。차외,재상동빈보효솔하,교전통고계조제AF협작통신계통,신계통적오비특솔(bit error rate,BER)성능유현저제승,여당BER등우10-3시,신계통적매비특능량여조성공솔보밀도지비(Eb/N0)장감소6~7 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 .