OFDM/OQAM散射系统格状成形峰均比抑制方法
|
摘要
针对交错正交幅度调制的正交频分复用(OFDM/OQAM)散射系统峰均比(PAPR)过高的问题,提出了一种基于格状成形(TS)的峰均比抑制方法。该方法通过在OQAM调制方式中引入星座冗余来实现信号PAPR的无失真降低,并设计了适用于OFDM/OQAM系统的Viterbi算法的分支度量。仿真结果表明,与传统的峰均比抑制算法相比,格状成形方法具有更好的降低OFDM/OQAM系统PAPR的能力,但由于符号传输的不确定性,系统的误码率(BER)性能有一定程度的下降。
In OFDM/OQAM-based scattered system, the peak-to-average ratio is maintaining at an excessively high level. To solve this problem, we proposed a suppression method based on Trellis Shaping. The method achieves distortion-free reduction of PAPR by introducing constellation redundancy into OQAM modulation mode and designs the branching measurement of Viterbi algorithm for OFDM/OQAM system. The simulation results showed that, compared with the traditional PAPR suppression algorithms, Trellis Shaping possesses better ability to reduce the PAPR of OFDM/OQAM system. However, the BER performance is degrading to some extent due to the uncertainty of symbol transmission.
In OFDM/OQAM-based scattered system, the peak-to-average ratio is maintaining at an excessively high level. To solve this problem, we proposed a suppression method based on Trellis Shaping. The method achieves distortion-free reduction of PAPR by introducing constellation redundancy into OQAM modulation mode and designs the branching measurement of Viterbi algorithm for OFDM/OQAM system. The simulation results showed that, compared with the traditional PAPR suppression algorithms, Trellis Shaping possesses better ability to reduce the PAPR of OFDM/OQAM system. However, the BER performance is degrading to some extent due to the uncertainty of symbol transmission.
引文
[1]Vangala S,Sundru A.Overlapped scaling tone reservation method for PAPR reduction in OFDM/OQAM systems[J].Procedia Computer Science,2016,93:632-638.
[2]Jone A E,Wilkinson T A,Barton S K.Block coding scheme for reduction of peak to mean envelop power ratio of multicarrier transmission schemes[J].IEEE Electronic Letters,1994,30(25):2089-2099.
[3]Wulich D.Reduction of peak to mean ratio of multicarrier modulation using cyclic coding[J].IEEE Electronic Letters,1996,32(5):432-433.
[4]Muller S,Huber J.OFDM with reduced peak-to-average power ratio by optimum combination of partial transmit sequences[J].IEEE Electronic Letters,1997,33(5):368-369.
[5]Jedwab J.Comment:M-sequence for OFDM peak-to-average power ratio reduction and error correction[J].IEEE Electronic Letters,1997,33(15):1293-1294.
[6]O'Neill R,Lopes L B.Envelope variations and spectral spatter in clipped multicarrier signals[J].In Proc.Personal,Indoor and Mobile Radio Communications (PIMRC),1995:71-75.
[7]Li X D,Cimini L J Jr.Effects of clipping and filtering on the performance of OFDM[J].IEEE Communications Letters.1998,2(5):131-133.
[8]Kim D,Stuber G L.Clipping noise mitigation for OFDM by decdision-aided reconstruction[J].IEEE Communications Letters,1999,3(1):4-6.
[9]Bauml R W,Fischer R F H,Huber J B.Reducing the peak-to-average power ratio of multicarrier modulation by selected mapping[J].IEEE Electronic Letters,1996,32(22):2056-2057.
[10]Forney G D.Trellis shaping[J].IEEE Trans.Inform.Theory,1992,38:281-300.
[11]Ochiai H.A novel trellis-shaping design with both peak and average power reduction for OFDM systems[J].IEEE Transactions on Communications,2004,52(11):1916-1926.
[12]Lele C.Iterative scattered-based channel estimation method for OFDM/OQAM[J].Eurasip Journal on Advances in Signal Processing,2012,2012(1):1-14.
[13]杨品露.OFDM信号的峰均比抑制技术研究[D].南京:东南大学,2011.
[14]Yoshizawa R,Ochiai H.Trellis-assisted constellation subset selection for PAPR reduction of OFDM signals[J].IEEE Transactions on Vehicular Technology,2017,66(3):2183-2198.
[15]李志勇,秦建存,梁进波.对流层散射通信工程[M].北京:电子工业出版社,2017.
[2]Jone A E,Wilkinson T A,Barton S K.Block coding scheme for reduction of peak to mean envelop power ratio of multicarrier transmission schemes[J].IEEE Electronic Letters,1994,30(25):2089-2099.
[3]Wulich D.Reduction of peak to mean ratio of multicarrier modulation using cyclic coding[J].IEEE Electronic Letters,1996,32(5):432-433.
[4]Muller S,Huber J.OFDM with reduced peak-to-average power ratio by optimum combination of partial transmit sequences[J].IEEE Electronic Letters,1997,33(5):368-369.
[5]Jedwab J.Comment:M-sequence for OFDM peak-to-average power ratio reduction and error correction[J].IEEE Electronic Letters,1997,33(15):1293-1294.
[6]O'Neill R,Lopes L B.Envelope variations and spectral spatter in clipped multicarrier signals[J].In Proc.Personal,Indoor and Mobile Radio Communications (PIMRC),1995:71-75.
[7]Li X D,Cimini L J Jr.Effects of clipping and filtering on the performance of OFDM[J].IEEE Communications Letters.1998,2(5):131-133.
[8]Kim D,Stuber G L.Clipping noise mitigation for OFDM by decdision-aided reconstruction[J].IEEE Communications Letters,1999,3(1):4-6.
[9]Bauml R W,Fischer R F H,Huber J B.Reducing the peak-to-average power ratio of multicarrier modulation by selected mapping[J].IEEE Electronic Letters,1996,32(22):2056-2057.
[10]Forney G D.Trellis shaping[J].IEEE Trans.Inform.Theory,1992,38:281-300.
[11]Ochiai H.A novel trellis-shaping design with both peak and average power reduction for OFDM systems[J].IEEE Transactions on Communications,2004,52(11):1916-1926.
[12]Lele C.Iterative scattered-based channel estimation method for OFDM/OQAM[J].Eurasip Journal on Advances in Signal Processing,2012,2012(1):1-14.
[13]杨品露.OFDM信号的峰均比抑制技术研究[D].南京:东南大学,2011.
[14]Yoshizawa R,Ochiai H.Trellis-assisted constellation subset selection for PAPR reduction of OFDM signals[J].IEEE Transactions on Vehicular Technology,2017,66(3):2183-2198.
[15]李志勇,秦建存,梁进波.对流层散射通信工程[M].北京:电子工业出版社,2017.