系统工程与电子技术
繫統工程與電子技術
계통공정여전자기술
SYSTEMS ENGINEERING AND ELECTRONICS
2014年
12期
2526-2532
,共7页
部分传输序列%循环移位%交换%盲检测
部分傳輸序列%循環移位%交換%盲檢測
부분전수서렬%순배이위%교환%맹검측
partial transmit sequence (PTS)%cyclic shift%switch%blind detection
为了降低多输入多输出正交频分复用（multiple input multiple output orthogonal frequency division multiplexing，MIMO-OFDM）系统中传统部分传输序列（partial transmit sequence，PTS）算法的计算复杂度，提出了联合时域和空间域信号处理的改进PTS算法。在时域信号处理部分，通过信号子块循环移位实现备选序列的增加；在空间域部分，利用天线间信号子块交换实现峰均功率比（peak to average power ratio，PAPR）抑制。同时在接收端，利用子块相位旋转引起的相位差异，本方法通过比较接收信号与星座点的距离，可以实现信号的盲检测，从而有效提高MIMO-OFDM系统的频谱利用率。仿真结果表明，提出的方法能有效地抑制MIMO-OFDM信号的PAPR，而且明显降低了传统PTS算法的计算复杂度，同时可获得跟传统PTS 方法已知边带副信息时相似的比特误码率（bit error rate，BER）性能。
為瞭降低多輸入多輸齣正交頻分複用（multiple input multiple output orthogonal frequency division multiplexing，MIMO-OFDM）繫統中傳統部分傳輸序列（partial transmit sequence，PTS）算法的計算複雜度，提齣瞭聯閤時域和空間域信號處理的改進PTS算法。在時域信號處理部分，通過信號子塊循環移位實現備選序列的增加；在空間域部分，利用天線間信號子塊交換實現峰均功率比（peak to average power ratio，PAPR）抑製。同時在接收耑，利用子塊相位鏇轉引起的相位差異，本方法通過比較接收信號與星座點的距離，可以實現信號的盲檢測，從而有效提高MIMO-OFDM繫統的頻譜利用率。倣真結果錶明，提齣的方法能有效地抑製MIMO-OFDM信號的PAPR，而且明顯降低瞭傳統PTS算法的計算複雜度，同時可穫得跟傳統PTS 方法已知邊帶副信息時相似的比特誤碼率（bit error rate，BER）性能。
위료강저다수입다수출정교빈분복용（multiple input multiple output orthogonal frequency division multiplexing，MIMO-OFDM）계통중전통부분전수서렬（partial transmit sequence，PTS）산법적계산복잡도，제출료연합시역화공간역신호처리적개진PTS산법。재시역신호처리부분，통과신호자괴순배이위실현비선서렬적증가；재공간역부분，이용천선간신호자괴교환실현봉균공솔비（peak to average power ratio，PAPR）억제。동시재접수단，이용자괴상위선전인기적상위차이，본방법통과비교접수신호여성좌점적거리，가이실현신호적맹검측，종이유효제고MIMO-OFDM계통적빈보이용솔。방진결과표명，제출적방법능유효지억제MIMO-OFDM신호적PAPR，이차명현강저료전통PTS산법적계산복잡도，동시가획득근전통PTS 방법이지변대부신식시상사적비특오마솔（bit error rate，BER）성능。
To reduce the computational complexity of the traditional partial transmit sequence (PTS)algo-rithm in the multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM)system, a modified PTS algorithm combining time domain and space domain signal processing is proposed.In the time domain,sub-blocks are operated by cyclic shift to achieve more candidate sequences.In the space domain,sub-blocks are switched between the antennas to suppress the peak to average power ratio (PAPR).At the receiver part,the signals at each sub-block multiply by different phase rotation factors and the sum of distances between the signal and its nearest constellation points is calculated to realize the blind detection of the signals.The simu-lation results show that the proposed method can reduce the PAPR effectively.In addition,compared with the traditional PTS algorithm,the proposed method can reduce the complexity significantly and obtain similar bit er-ror rate (BER)performance.
