雙向中繼系統(tǒng)用戶聯(lián)合預(yù)編碼與檢測(cè)算法研究
doi: 10.11999/JEIT141455
基金項(xiàng)目:
國(guó)家自然科學(xué)基金(61179018, 41476089)和泰山學(xué)者建設(shè)工程專項(xiàng)經(jīng)費(fèi)資助課題
Research on Users Joint Precoding and Detection in Two-way Relay Systems
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摘要: 雙向中繼協(xié)同通信系統(tǒng)的兩用戶節(jié)點(diǎn)通過中繼節(jié)點(diǎn)相互交換信息，顯示了其在頻譜效率上的優(yōu)勢(shì)。在系統(tǒng)裝備多天線的情況下，為進(jìn)一步改善誤比特率性能，論文提出一種基于格規(guī)約算法的用戶聯(lián)合預(yù)編碼與檢測(cè)算法。該算法通過一次復(fù)數(shù)域格規(guī)約處理來提高信道增益矩陣的正交性，預(yù)編碼和檢測(cè)算法聯(lián)合應(yīng)用處理后的矩陣，中繼節(jié)點(diǎn)僅需要對(duì)接收信號(hào)進(jìn)行求模運(yùn)算和放大轉(zhuǎn)發(fā)，算法的復(fù)雜度主要集中在兩用戶節(jié)點(diǎn)上。仿真結(jié)果顯示：相比于傳統(tǒng)的預(yù)編碼和檢測(cè)算法，用戶聯(lián)合預(yù)編碼與檢測(cè)算法在計(jì)算復(fù)雜度僅增加了對(duì)信道增益矩陣一次格規(guī)約計(jì)算的前提下，可顯著降低系統(tǒng)的誤比特率，提高分集增益，具有工程實(shí)用價(jià)值。Abstract: Two-way relay cooperative communication system demonstrates significant gain in spectral efficiency when two user nodes exchange information via a relay node. For improving the Bit Error Rate (BER) performance, a joint precoding and detection algorithm is proposed based on Lattice Reduction (LR) when all the nodes equipped with multiple antennas. The proposed algorithm modifies the channel gain matrix into more orthogonal matrix by the complex lattice reduction. Precoding and detection algorithms are combined to apply the modified matrix. The relay node processes the receiving signal by simple modulo operation and amplification. The main complexity of the algorithm is in the two user nodes. The simulation evaluations show that, the computational complexity of the algorithm is increasing just because the channel gain matrix is modified by lattice reduction. The proposed joint precoding and detection algorithm can significantly improve the performance of BER and achieve full diversity, hence it is applicable to engineering.
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Key words:
- Cooperative communication /
- Two-way relaying /
- Lattice Reduction (LR) /
- Precoding /
- Detection
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