一種基于小波聚類的NOMA系統(tǒng)SIC盲檢測算法
電子技術應用
劉佳1,2,張浩1,王波1
1.桂林電子科技大學 信息與通信學院, 廣西 桂林 541004;2.北京三星通信技術研究有限公司,北京 100028
摘要: 非正交多址接入(Non-Orthogonal Multiple Access, NOMA)下行多用戶傳輸場景中,基站將發(fā)送給多個用戶的信息在頻率域進行疊加,各用戶通過串行干擾消除(Successive Interference Cancellation, SIC)來消除其他用戶的干擾。在解調(diào)和SIC前,需要進行多用戶的參數(shù)盲檢測, 從而降低NOMA 系統(tǒng)信令開銷。通過對星座圖的形狀特征的利用,提出一種基于小波聚類的多參數(shù)盲檢測算法,該算法利用到了聚類中的網(wǎng)格法。仿真結果表明,提出的算法檢測性能優(yōu)于經(jīng)典的基于對數(shù)最大似然估計(Max-Log Likelihood Estimation, MLLE)算法且計算復雜度與之相當。
關鍵詞:NOMA;盲檢測;小波聚類;網(wǎng)格法
中文引用格式: 劉佳,張浩,王波. 一種基于小波聚類的NOMA系統(tǒng)SIC盲檢測算法[J]. 電子技術應用,2023,49(12):114-119.
英文引用格式: Liu Jia,Zhang Hao,Wang Bo. A novel blind detection algorithm for successive interference cancellation in NOMA system based on wavelet cluster[J]. Application of Electronic Technique,2023,49(12):114-119.
英文引用格式: Liu Jia,Zhang Hao,Wang Bo. A novel blind detection algorithm for successive interference cancellation in NOMA system based on wavelet cluster[J]. Application of Electronic Technique,2023,49(12):114-119.
A novel blind detection algorithm for successive interference cancellation in NOMA system based on wavelet cluster
Liu Jia1,2,Zhang Hao1,Wang Bo1
1.School of Information and Communication Engineering, Guilin University of Electronic Technology, Guilin 541004, China; 2.Samsung Research China-Beijing (SRC-B), Beijing 100028,China
Abstract: In NOMA downlink multi user transmission scenario, the base station transmits a data packet by multi-user superposition to a destination in the frequency domain. In this system, successive interference cancellation (SIC) receiver is used to eliminate the co-channel interference for each user. Before demodulation and SIC, a blind detection for multi user parameter is required to reduce the signaling overhead of the NOMA system. By utilizing the shape features of constellation map, a blind detection algorithm for multi parameters based on wavelet clustering is proposed, which utilizes the grid-based method in clustering. The simulation results show that the proposed algorithm achieves higher detection performance than the max-log likelihood estimation (MLLE) algorithm under the approximate computation complexity.
Key words : NOMA;blind detection;wavelet cluster;grid-based method
0 引言
為大規(guī)模無線設備和數(shù)據(jù)傳輸提供有效支持,是當前5G及下一代蜂窩網(wǎng)無線通信6G的主要目標[1]。非正交多址接入(Non-Orthogonal Multiple Access, NOMA)系統(tǒng)在發(fā)送端進行了疊加編碼技術, 且在接收端采用串行干擾消除(Successive Interference Cancellation, SIC)接收機來消減干擾,因此,相比正交多址接入(Orthogonal Multiple Access, OMA)系統(tǒng),NOMA系統(tǒng)SIC具有更高的頻譜效率[2]。由于NOMA系統(tǒng)接收機的正常工作離不開接收端用戶設備的網(wǎng)絡層參數(shù),比如預編碼矩陣指示(Pre-coded Matrix Index, PMI)、調(diào)制階數(shù)(Modulation Order)和秩指示(Rank Index, RI)等。然而,這些網(wǎng)絡層參數(shù)都是由無線資源控制(Radio Resource Control, RRC)信令攜帶[3],這些網(wǎng)絡層參數(shù)在NOMA系統(tǒng)中傳輸相對于OMA系統(tǒng)而言會增加信令的消耗[4]。為了降低信令的開銷,需要對多用戶的這些動態(tài)信令進行全部或者部分盲檢測。
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作者信息:
劉佳1,2,張浩1,王波1
(1.桂林電子科技大學 信息與通信學院, 廣西 桂林 541004;2.北京三星通信技術研究有限公司,北京 100028)
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