利用部分傳輸序列減小MCCDMA系統(tǒng)的峰均比
Peak-to-Average Power Ratio Reduction in MC-CDMA Systems by Using Partial Transmit Sequence Schemes
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摘要: 為了更好地利用部分傳輸序列(PTS)來降低多載波碼分多址(MC-CDMA)系統(tǒng)的峰均功率比(PAR)，該文提出了對多路傳輸?shù)淖虞d波信號采用非均勻相鄰分割方法。即在子載波頻段上適當?shù)販p小低頻和高頻子載波塊的大小，增大中間頻率子載波塊的大小可以進一步減小PAR。當中間頻段數(shù)據(jù)塊的大小是最低(或高)頻段數(shù)據(jù)塊的2倍時PAR達到最小，比均勻分割法下降0.2dB。針對旋轉(zhuǎn)矩陣最優(yōu)解的求解空間太大，該文同時采用遺傳算法來減小計算的復(fù)雜度，仿真表明經(jīng)過60代的進化可以達到最優(yōu)解。
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關(guān)鍵詞:
- MC-CDMA; 峰均功率比（PAR）; 子載波分割; 遺傳算法
Abstract: The un-uniform adjacent subcarrier partition method is proposed in order to reduce the Peak-to-Average power Ratio (PAR) of the signal in MultiCarrier-CDMA(MC-CDMA) systems by using Partial Transmit Sequence (PTS) scheme. That is reducing the number of subcarriers of high and low frequencies within a data block, and enhancing the number of subcarriers of intermediate frequencies if considering all subcarriers frequency as an band of frequency. When the number of subcarriers of the intermediate frequency within a data block is double of the number of subcarriers of the high (or low) frequencies, the PAR reduces 0.2dB comparing with that of the uniform partition. The Ganetic Algorithm(GA) is proposed in order to reduce the iterative number when the space of rotate-matrix is very big. By 60 generations evolution, the optimum value can be obtained. The results of simulation validate the proposed method. -
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