通信技术
通信技術
통신기술
COMMUNICATIONS TECHNOLOGY
2014年
1期
24-28
,共5页
无线通信%连续相位调制%逐幸存处理%Viterbi译码
無線通信%連續相位調製%逐倖存處理%Viterbi譯碼
무선통신%련속상위조제%축행존처리%Viterbi역마
wireless communication%continuous phase modulation%PSP( per-survivor processing)%Viter-bi decoder
针对时变频率选择性衰落信道，研究了连续相位调制( CPM)信号的逐幸存检测算法。该算法在未知信道状态的条件下，利用训练序列对信道参数进行初始估计。在对CPM信号进行Viterbi解调过程中，采用PSP技术实现信道的无延时跟踪。基于频域均衡的CPM检测算法虽然可以有效抗多径干扰且计算复杂度较低，但不能对时变信道进行跟踪。仿真结果表明，在时变多径信道下，基于PSP均衡的CPM检测算法能有效地进行信道参数估计，比频域均衡算法具有更好的误码性能。
針對時變頻率選擇性衰落信道，研究瞭連續相位調製( CPM)信號的逐倖存檢測算法。該算法在未知信道狀態的條件下，利用訓練序列對信道參數進行初始估計。在對CPM信號進行Viterbi解調過程中，採用PSP技術實現信道的無延時跟蹤。基于頻域均衡的CPM檢測算法雖然可以有效抗多徑榦擾且計算複雜度較低，但不能對時變信道進行跟蹤。倣真結果錶明，在時變多徑信道下，基于PSP均衡的CPM檢測算法能有效地進行信道參數估計，比頻域均衡算法具有更好的誤碼性能。
침대시변빈솔선택성쇠락신도，연구료련속상위조제( CPM)신호적축행존검측산법。해산법재미지신도상태적조건하，이용훈련서렬대신도삼수진행초시고계。재대CPM신호진행Viterbi해조과정중，채용PSP기술실현신도적무연시근종。기우빈역균형적CPM검측산법수연가이유효항다경간우차계산복잡도교저，단불능대시변신도진행근종。방진결과표명，재시변다경신도하，기우PSP균형적CPM검측산법능유효지진행신도삼수고계，비빈역균형산법구유경호적오마성능。
A detection algorithm based on PSP( per-survivor processing) equalization for continuous phase modulation over time-varying frequency-selective fading channels is proposed. In the proposed receiver, initial channel impulse ( CIR) is estimated with a training sequence. PSP provides a general framework for the detection of CPM signal whenever the presence of unknown parameters prevents the precise use of clas-sical Viterbi algorithm. FDE has a very wide range of application because it provides a solution to mul-tipath interference with low complexity. However the algorithm couldn't be used in tracking time-varying channels. It is found that the bit-error-rate performance of PSP decoder without channel state information ( CSI) is better than that of the frequency domain equalization algorithm in multipath fading channels.
