基于频域迭代判决反馈均衡的低复杂度FTN接收机

doi:10.11959/j.issn.1000-436x.2017052

Abstract

Abstract:

Faster-than-Nyquist (FTN) signaling can improve the system effectiveness without reducing the system reliability,but the fierce inter-symbol interference (ISI) introduced by it may cause that the complexity of the optimal receiver is intolerable.An effective low-complexity FTN receiver is iterative block decision feedback equalizer (IBDFE),which can achieve performance close to the optimal receiver with much lower complexity,but its complexity can be further reduced.Therefore,a reduced-complexity IBDFE (RC-IBDFE) was proposed for FTN communication systems,which was based on IBDFE,but introduced a simplified method to design the feedforward and feedback filters.When packing factor is τ={0.8,0.7},numerical results and analysis indicate that,compared with IBDFE,RC-IBDFE has stronger robustness,its complexity is reduced by {45.7%,25%},and its performance gain is {0.605 4,0.193 6} dB when the bit error rate (BER) is 10^-5.Compared with the existing low-complexity IBDFE (LC-IBDFE),RC-IBDFE has stronger robustness,its complexity is reduced by {13.6%,-25.8%},and its performance gain is {0.289 7,0.531 2} dB when the BER is 10^-5.

Key words: FTN signaling, inter-symbol interference, iterative block decision feedback equalizer, complexity

CLC Number:

TN911.23

Juan ZENG,Ying WANG,Xiao-na LI,Zhong-fang WANG,Yong-ming WANG. Low-complexity FTN receivers based on frequency domain iterative decision feedback equalization[J]. Journal on Communications, 2017, 38(4): 190-198.

Figures/Tables 12

接收机	所需的复乘次数
IBDFE	N_IL_blbL_b
LC-IBDFE	N_IL_blbL_b-N_IL_b+L_b
RC-IBDFE	$N_{I} L_{b} lb L_{b} - \frac{L_{b}}{2 lb L_{b}} - N_{I} L_{b} + 2 L_{b}$

References 14

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参数	参数取值
调制方式	8PSK
信道h(t)	AWGN信道
{s_n}数据块总数	10 000
{s_n}数据块长度L_b	L _b=1 024
{q_n}长度L_q	τ=0.8时,L_q=13;τ=0.7时,L_q=15
ISI长度L_ISI	τ=0.8时,L_ISI=12;τ=0.7时,L_ISI=14
PN序列长度L_PN	τ=0.8时,L_PN=12;τ=0.7时,L_PN=14
{d_n}数据块长度L_d	τ=0.8时,L_d=1012;τ=0.7时,L_d=1010
脉冲成型滤波器 f(t)	根升余弦（滚降因子0.5、截断长度5T）

接收机	信号处理、滤波器设计所需的总的复乘数		相对IBDFE降低的复杂度
接收机	τ=0.8	τ=0.7	τ=0.8	τ=0.7
IBDFE	35 840	53 248	-	-
LC-IBDFE	22 528	31 744	37.1%	40.4%
RC-IBDFE	19 456	39 936	45.7%	25%

差异类型	差异值/dB
差异类型	τ=0.8	τ=0.7
IBDFE-LC-IBDFE	0.315 7	-0.337 6
IBDFE-RC-IBDFE	0.605 4	0.193 6
LC-IBDFE-RC-IBDFE	0.289 7	0.531 2

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Low-complexity FTN receivers based on frequency domain iterative decision feedback equalization

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