V-BLAST系統(tǒng)中采用發(fā)射功率分配的MMSE迭代軟干擾抵消算法

唐萬斌; 張亮; 李少謙

V-BLAST系統(tǒng)中采用發(fā)射功率分配的MMSE迭代軟干擾抵消算法

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出版歷程
- 收稿日期: 2004-12-17
- 修回日期: 2005-08-04
- 刊出日期: 2006-09-19

MMSE Iterative Soft Interference Cancellation Algorithm Using Transmit Power Allocation Scheme in V-BLAST System

摘要

摘要: 作為一種軟輸入軟輸出的MIMO檢測算法，MMSE迭代軟干擾抵消算法在MIMO Turbo接收機(jī)中得到廣泛的關(guān)注。為了進(jìn)一步改善系統(tǒng)性能，采用鏈路自適應(yīng)方案是很好的選擇。該文給出變發(fā)射功率的MMSE迭代軟干擾抵消算法，并采用了一種有效的發(fā)射功率分配方案，只需要很少的控制信令，就可以獲得較大的誤碼率性能改善。通過沒有信道編譯碼的鏈路仿真，在4發(fā)4收QPSK調(diào)制的V-BLAST系統(tǒng)中，如果誤碼率要求為BER=10-3，MMSE迭代軟干擾抵消檢測算法迭代次數(shù)為2時，采用推薦的發(fā)射功率分配方案比不采用發(fā)射功率分配方案的系統(tǒng)性能提高了約2dB，如果調(diào)制方式為16QAM，系統(tǒng)性能提高了約6dB。
- V-BLAST; 發(fā)射功率分配; MMSE; 軟入軟出
Abstract: In an achieving near-capacity V-BLAST turbo receiver, Soft-In/Soft-Out (SISO) signal detector is needed. Minimum Mean Square Error (MMSE) iterative soft interference canceller is a popular SISO detector in such system. Link adaptation is a good scheme to improve performance in wireless system. In the paper, a modification of MMSE iterative soft interference cancellation detector is presented for variable transmission power, and an effective transmit power scheme is proposed to decrease Bit Error Rate (BER). This scheme requires small feedback overhead. By simulation of uncoded V-BLAST system with 4 transmit antennas and 4 receive antennas, it is proved that if the performance requirement of BER=10-3, the modified V-BLAST system with transmit power allocation outperforms the conventional V-BLAST system about 2dB when QPSK modulation is used and iterative number of detection equals 2. When 16QAM is used, the proposed scheme outperforms the conventional scheme about 6dB.

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參考文獻(xiàn)(1)

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