單載波寬帶MIMO系統(tǒng)廣義近似消息傳遞Turbo頻域均衡
doi: 10.11999/JEIT140267 cstr: 32379.14.JEIT140267
基金項(xiàng)目:
國(guó)家自然科學(xué)基金(61172086)資助課題
Generalized Approximate Message Passing Based Turbo Frequency Domain Equalization for Single Carrier Broadband MIMO Systems
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摘要: 針對(duì)編碼單載波循環(huán)前綴(SC-CP)多輸入多輸出(MIMO)系統(tǒng)，該文采用消息傳遞算法研究軟輸入軟輸出MIMO頻域均衡器(FDE)的設(shè)計(jì)問(wèn)題?；趶V義近似消息傳遞(GAMP)算法，該文提出一種新的低復(fù)雜度MIMO頻域均衡方法。這種消息傳遞MIMO均衡方法的顯著特點(diǎn)是既保留了SC-CP傳輸所產(chǎn)生的頻域均衡的優(yōu)點(diǎn)，同時(shí)又避免了傳統(tǒng)MIMO FDE中逐頻點(diǎn)MIMO矩陣求逆運(yùn)算，所以具有隨MIMO系統(tǒng)接收天線數(shù)增加而線性增長(zhǎng)的計(jì)算復(fù)雜度。計(jì)算機(jī)仿真結(jié)果表明，與傳統(tǒng)方案相比，該文提出的MIMO頻域均衡算法具有明顯的誤碼率(BER)性能優(yōu)勢(shì)。
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關(guān)鍵詞:
- 無(wú)線通信 /
- 單載波循環(huán)前綴 /
- 多輸入多輸出 /
- 廣義近似消息傳遞算法 /
- Turbo頻域均衡
Abstract: The design of soft-input soft-output Frequency Domain Equalizer (FDE) is explored by using message passing methods for MIMO Single Carrier-Cyclic Prefix (SC-CP) systems. A novel low-complexity MIMO Turbo frequency domain equalization scheme is proposed based on the Generalized Approximate Message Passing (GAMP) algorithm. This new message passing MIMO equalization approach can circumvent the problem of MIMO matrix inversion on each frequency bin involved in the conventional MIMO FDE, while retaining the merits of frequency domain equalization due to SC-CP transmission. Thus, it has a complexity that grows linearly with the number of receive antennas. Simulation results show that the proposed MIMO equalization algorithm can significantly outperform the conventional counterpart in the terms of Bit Error Rate (BER) performance. -
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