OTFS接收端信道估计辅助的无记忆功放非线性失真补偿算法

doi:10.11959/j.issn.1000-436x.2022239

Abstract

Abstract:

A compensation algorithm for OTFS receiver was proposed to solve the problem of transmission signal distortion caused by the nonlinear characteristics of power amplifier (PA) in the orthogonal time frequency space (OTFS) system.The channel state information was estimated by Bussgang theorem combined with the complex coefficient polynomial of PA and the average energy of the distortion term.Based on it, the transmitted signal was reconstructed with distortion term and the estimated value was updated for the polynomial normalization.Furthermore, the iterative zero-forcing equalization algorithm was employed to complete adaptive compensation analysis of the nonlinear distortion at the receiver.The results show that the nonlinear influence on transmission signals is reduced, which caused by Saleh and Rapp models, and BER performance of OTFS system is improved effectively.

Key words: OTFS, power amplifier, nonlinear distortion, channel estimation, adaptive compensation

CLC Number:

TN92

Zhanjun JIANG, Huan LIU, Huawei ZHANG, Cuiran LI. Nonlinear distortion compensation algorithm aided by channel estimation of memoryless power amplifier for OTFS receiver[J]. Journal on Communications, 2022, 43(12): 134-145.

Figures/Tables 20

步骤	计算复杂度
步骤 2)计算时频域信道响应估计值 ${\hat{H}}_{λ}$	$O (N^{3} M^{3} + N^{2} M)$
步骤 3)计算归一化系数估计值向量 $\hat{ξ}$	$O (M^{6} + N M^{2} + N^{2} M)$
所有步骤	$O (M^{6} + N^{3} M^{3} + N M^{2} + N^{2} M)$

步骤	计算复杂度
步骤1)计算发送信号估计值 $\hat{X}$	$O (N^{6} + N^{2} M)$
步骤2)计算 $\hat{d} \in ℂ^{N \times M}$	$O (N M)$
步骤3)补偿非线性失真项	$O (N M)$
步骤4)更新发送信号估计值 $\hat{X}$	$O (N^{6} + N^{2} M)$
所有步骤	$O (N^{6} + N^{2} M + N M)$

系统	信号处理	发送端复数乘法	接收端复数乘法	N=16,M =32时系统复杂度
DD 域信号处理的OTFS系统	（ISFFT+海森堡变换）/（维格纳变换+SFFT）	$N M lb N + \frac{N M}{2} lb M$	$N M lb N + \frac{N M}{2} (1 + lb M)$	发送端 $O$ (3 328)
				接收端 $O$ (3 584)
				总复杂度 $O$ (6 912)
TF域信号处理的OTFS系统	（海森堡变换）/（维格纳变换）	$\frac{N M}{2} lb M$	$\frac{N M}{2} (1 + lb M)$	发送端 $O$ (1 280)
				接收端 $O$ (1536)
				总复杂度 $O$ (2 816)

参数名称	参数数值
载波频率( f_c)/GHz	6
子载波间隔(Δf )/kHz	30
子载波数(M )	32
OTFS符号数(N )	16
调制方式	64-QAM,256-QAM
带宽(W =M Δf )/MHz	0.96
时延分辨率 $d_{r} = \frac{1}{W}$ )/ns	104
OTFS符号持续时间 $T = \frac{M}{W}$ )/ns	33 333
多普勒分辨率( $f_{r} = \frac{1}{N T}$ )/Hz	1 875
最大时速(v_max )/(km·h^-1)	500

References 31

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Nonlinear distortion compensation algorithm aided by channel estimation of memoryless power amplifier for OTFS receiver

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