一種基于QR分解的穩(wěn)健干擾對(duì)齊算法

謝顯中; 張森林; 肖正瑛

doi:10.11999/JEIT141585

一種基于QR分解的穩(wěn)健干擾對(duì)齊算法

doi: 10.11999/JEIT141585

基金項(xiàng)目:

國家自然科學(xué)基金(61271259, 61301123)，重慶市自然科學(xué)基金(CTSC2011jjA40006)，重慶市教委科學(xué)技術(shù)研究項(xiàng)目(KJ120501, KJ130536)，長江學(xué)者和創(chuàng)新團(tuán)隊(duì)發(fā)展計(jì)劃(IRT1299)和重慶市科委重點(diǎn)實(shí)驗(yàn)室專項(xiàng)經(jīng)費(fèi)(CSTC)

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出版歷程
- 收稿日期: 2014-12-11
- 修回日期: 2015-04-20
- 刊出日期: 2015-08-19

Robust Interference Alignment Algorithm Based on QR Decomposition

摘要

摘要: 大多數(shù)干擾對(duì)齊算法都假定發(fā)送端可以獲得理想的信道狀態(tài)信息(CSI)，由于信道估計(jì)誤差、反饋延遲等原因，實(shí)際通信系統(tǒng)中CSI往往是有誤差的。為此，該文提出一種基于QR分解的穩(wěn)健干擾對(duì)齊算法。對(duì)含有誤差的聯(lián)合接收信號(hào)進(jìn)行基于QR分解的預(yù)處理，消除一半有誤差的干擾；然后在有誤差的等效信道聯(lián)合矩陣下，充分考慮信道誤差和干擾的影響，通過最小化發(fā)送端泄漏到非目標(biāo)接收端的干擾信號(hào)功率來設(shè)計(jì)預(yù)編碼矩陣，并基于最小均方誤差(MMSE)準(zhǔn)則來設(shè)計(jì)干擾抑制矩陣。最后，在理想CSI和誤差CSI的情況下，通過實(shí)驗(yàn)仿真，證明了該算法有效地提高了系統(tǒng)性能。
- 無線通信 /
- 穩(wěn)健干擾對(duì)齊 /
- 信道估計(jì)誤差 /
- QR分解 /
- 系統(tǒng)性能
Abstract: Most interference alignment algorithms assume that the senders know perfect Channel State Information (CSI), but in practical communication systems, due to the channel estimation error, the delayed feedback and so on, the CSI often exists the error. Therefore, a robust interference alignment algorithm is presented based on the QR decomposition. Firstly, the QR is used to preprocess the jointly received signal with the of error for eliminating half of the interference terms. Then this paper minimizes the interference power from the sender to the other receivers to design the pre-coding matrix, and utilizes Minimum Mean Square Error (MMSE) criterion to design the interference suppression matrix. Finally, under the conditions of perfect CSI and error CSI, the simulation results verify that the proposed algorithm improves effectively the performance of the system.
- Wireless communication /
- Robust interference alignment /
- Channel estimation error /
- QR decomposition /
- Performance of system

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參考文獻(xiàn)(17)

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