基于多层叠加传输的超奈奎斯特传输方案

doi:10.11959/j.issn.1000-436x.2017185

通信学报 ›› 2017, Vol. 38 ›› Issue (9): 86-94.doi: 10.11959/j.issn.1000-436x.2017185

基于多层叠加传输的超奈奎斯特传输方案

李双洋^1,²,平磊¹,白宝明¹,马啸³

¹ 西安电子科技大学综合业务网理论及关键技术国家重点实验室，陕西西安 710071
² 通信网信息传输与分发技术重点实验室，河北石家庄 050081
³ 中山大学数据科学与计算机学院，广东广州 510006

修回日期:2017-07-05 出版日期:2017-09-01 发布日期:2017-10-18
作者简介:李双洋（1991-），男，辽宁沈阳人，西安电子科技大学博士生，主要研究方向为带宽有效调制技术、均衡算法以及应用信息理论。|平磊（1990-），男，河南郑州人，西安电子科技大学硕士生，主要研究方向为Turbo码编译码研究及硬件实现。|白宝明（1966-），男，山西大同人，西安电子科技大学教授，主要研究方向为信息论与信道编码、无线通信和量子通信。|马啸（1968-），男，河南焦作人，博士，中山大学教授，主要研究方向为信息理论与信道编码的应用。
基金资助:
国家自然科学基金资助项目(61372074);国家自然科学基金资助项目(91438101)

Faster-than-Nyquist transmission based on multi-layer superposition

Shuang-yang LI^1,²,Lei PING¹,Bao-ming BAI¹,Xiao MA³

¹ State Key Lab of Integrated Service Networks,Xidian University,Xi’an 710071,China
² Science and Technology on Communication Networks Laboratory,Shijiazhuang 050081,China
³ School of Data and Computer Science,Sun Yat-Sen University,Guangzhou 510006,China

Revised:2017-07-05 Online:2017-09-01 Published:2017-10-18
Supported by:
The National Natural Science Foundation of China(61372074);The National Natural Science Foundation of China(91438101)

摘要/Abstract

摘要：

超奈奎斯特（FTN,faster-than-Nyquist）传输技术作为一种能够有效提高系统频谱利用率的手段，受到了广泛的关注。针对该技术在信号检测中所具有的检测复杂度高的缺陷，提出一种基于多层叠加传输的 FTN 传输系统。通过理论推导给出了其每层最佳编码方案的选择依据，并通过仿真证明在每一层码率与功率同时变化的性能优于仅功率发生变化的情形，仿真结果同时表明在脉冲成形函数的滚降系数不为0的条件下，该系统的性能优于级联了更大星座的正交传输系统的性能。

关键词: 超奈奎斯特传输, 多层结构, 逐次干扰抵消, 叠加编码, 检测算法

Abstract:

Faster-than-Nyquist (FTN) signaling technique has received much attention recently as an effective way of enhancing the spectral efficiency.In order to reduce the detection complexity for FTN signals,a multi-layer superposition transmission approach was present.In addition,how to calculate upper bounds on the highest information transmission rate was shown and how to choose suitable component codes was suggested.Numerical results show that the system with different code rates and power on each layer outperforms the system with only power variance on each layer,meanwhile results also imply that given the roll-off factor of the pulse shaping function is not zero,the proposed system is superior to the orthogonal system with a higher modulation format.

Key words: faster-than-Nyquist signaling, multi-layer structure, successive interference cancellation, superposition cod-ing, detection method

中图分类号:

TN911.23

李双洋,平磊,白宝明,马啸. 基于多层叠加传输的超奈奎斯特传输方案[J]. 通信学报, 2017, 38(9): 86-94.

Shuang-yang LI,Lei PING,Bao-ming BAI,Xiao MA. Faster-than-Nyquist transmission based on multi-layer superposition[J]. Journal on Communications, 2017, 38(9): 86-94.

图/表 11

图1

图2

图3

图4

表1

多层叠加传输的FTN传输系统仿真参数1"

参数	第一层参数		第二层参数	奈奎斯特系统参数
编码方式	Turbo码		Turbo码	Turbo码
信息位长度	N₁=6 000		N₂=3 000	N=12 008
码率	$R_{1} = \frac{2}{3}$		$R_{2} = \frac{1}{3}$	$R = \frac{2}{3}$
编码后比特长度	9 012		9 012	18 024
调制方式	QPSK		QPSK	8PSK
发送功率比	0.5		0.5	1
频谱效率		η₁=1.536bit·s^?1·Hz^?1		η₂=1.537bit·s^?1·Hz^?1

表1

表2

每层等码率不等功率的FTN传输系统仿真参数"

参数	第一层参数	第二层参数
编码方式	LDPC码	LDPC码
信息位长度	N₁=16 384	N₂=16 384
码率	$R_{1} = \frac{2}{3}$	$R_{2} = \frac{2}{3}$
编码后比特长度	24 576	24 576
调制方式	QPSK	QPSK
每层功率比	0.730 9	0.269 1

表2

表3

每层不等码率不等功率的FTN传输系统仿真参数"

参数	第一层参数	第二层参数	第三层参数
编码方式	Turbo码	Turbo码	Turbo码
信息位长度	N₁=5 458	N₂=8 187	N₃=8 187
码率	$R_{1} = \frac{1}{3}$	$R_{2} = \frac{1}{2}$	$R = \frac{1}{2}$
编码后比特长度	16 386	16 386	16 386
调制方式	QPSK	QPSK	QPSK
每层功率比	0.106 0	0.291 5	0.602 5

表3

图5

图6

表4

高谱效率下多层FTN传输系统的仿真参数"

参数	第一层	第二层	第三层	第四层	第五层	第六层	奈奎斯特系统
编码方式	Turbo码	Turbo码	Turbo码	Turbo码	Turbo码	Turbo码	Turbo码
信息位长度	N₁=10 000	N₂=10 000	N₃=10 000	N₄=10 000	N₅=10 000	N₆=10 000	N=90 009
码率	$R_{1} = \frac{1}{2}$	$R_{2} = \frac{1}{2}$	$R_{3} = \frac{1}{2}$	$R_{4} = \frac{1}{2}$	$R_{5} = \frac{1}{2}$	$R_{6} = \frac{1}{2}$	$R = \frac{3}{4}$
编码后比特长度	20 012	20 012	20 012	20 012	20 012	20 012	120 024
调制方式	QPSK	QPSK	QPSK	QPSK	QPSK	QPSK	256-QAM

表4

图7

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基于多层叠加传输的超奈奎斯特传输方案

Faster-than-Nyquist transmission based on multi-layer superposition

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