Massive MIMO中通信高效的分布式预编码设计

doi:10.11959/j.issn.1000-436x.2023147

Abstract

Abstract:

A communication-efficient distributed precoding scheme was proposed for multi-baseband processing unit (BBU) baseband processing architecture, aiming to reduce fronthaul data exchange and computational complexity between BBUs.Firstly, a distributed framework based on R-WMMSE algorithm was proposed, which utilized the subspace property of the optimal solution to compress the interactive data losslessly, thereby reducing data exchange.Furthermore, two learnable compression modules based on matrix multiplication were designed, using optimized computing structures and matrix parameters to reduce the parameters and computations while maintaining function expressiveness.Finally, the learnable modules and the distributed precoding framework were jointly optimized with achievable rate as the optimization objective to obtain the final model.The proposed scheme can achieve guaranteed precoding performance under lower requirements on data interaction and computational complexity

Key words: distributed precoding, data compression, deep learning, joint optimization

CLC Number:

TN929.53

Mian LI, Yang LI, Zonghui ZHANG, Qingjiang SHI. Communication-efficient distributed precoding design for Massive MIMO[J]. Journal on Communications, 2023, 44(8): 37-48.

Figures/Tables 6

算法	数据交互量/个
R-WMMSE	$\frac{1}{2} C N^{2} + C D N = 8 192$
DSC 16×16	$\frac{1}{2} C N^{2} + \frac{1}{2} C D N = 6 144 (- 25.0 %)$
SSC 16×16
FC 256×1
DSC 12×16	$\frac{1}{2} C N^{2} + \frac{3}{8} C D N = 5 632 (- 31.2 %)$
SSC 12×16
FC 192×1

References 19

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参数名称	参数取值	代码取值	含义
中央频率	qd_simulation_parameters.center_frequency	4.9×10⁹	频谱中心频率为4.9 GHz
3GPP基线	qd_simulation_parameters.use_3GPP_baseline	1	使用3GPP规定的信道特性，不使用额外特性
随机相位	qd_simulation_parameters.use_random_initial_phase	1	使用随机相位
自相关函数	qd_simulation_parameters.autocorrelation_function	‘Comb300’	使用梳状自相关函数，包含300个正弦信号，用于产生与空间位置相关的随机信号
阵列类型	tx_array.qd_arrayant[1]	‘3GPP-mmw’	3GPP毫米波阵列
通道垂直振子数	tx_array.qd_arrayant[2]	4	每通道4垂直振子
通道水平振子数	tx_array.qd_arrayant[3]	1	每通道1水平振子
极化类型	tx_array.qd_arrayant[5]	6	±45°极化
天线下倾角	tx_array.qd_arrayant[6]	15	下倾角15°
振子间距	tx_array.qd_arrayant[7]	0.5	振子间距半波长
每列通道数	tx_array.qd_arrayant[8]	4	每列4通道
每行通道数	tx_array.qd_arrayant[9]	4	每行4通道
通道垂直间距	tx_array.qd_arrayant[10]	0.5	垂直间距半波长
通道水平间距	tx_array.qd_arrayant[11]	0.5	水平间距半波长
接收天线类型	rx_array.qd_arrayant[1]	‘xpol4’	4极化天线
基站抬高	—	25	基站抬高25 m
用户随机分布区域	—	—	天线阵列指向方向，以基站为圆心、半径为 120 m、角度为120°的扇形区域
用户随机分布类型	—	—	均匀分布

方法	复杂度/次
R-WMMSE	400 320
FC 256×1	426 112 (+6.4%)
FC 192×1	360 576 (-9.9%)
DSC 16×16	188 544 (-52.9%)
SSC 16×16	180 352 (-55.0%)
DSC 12×16	182 400 (-54.4%)
SSC 12×16	176 256 (-56.0%)

Communication-efficient distributed precoding design for Massive MIMO

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