双向中继系统中基于对角空时码的空间调制传输算法

doi:10.11959/j.issn.1000-436x.2015164

摘要/Abstract

摘要：

在双向中继系统中，针对采用SSK传输不能获得发射分集且频谱效率较低的问题，提出了一种对角空时码空间调制算法，简称为 DSTC-SM。该算法在源节点处采用 DSTC-SM 码字发送信号，在中继节点处配置单根天线对接收到的信号进行放大并将其转发至目的节点。DSTC-SM 码字的构造中以对角码作为基本码块，并与空间调制（SM）技术相结合，采用循环结构来激活不同的天线。此外，通过对旋转角度的优化使该方案在即使只激活一根天线的情况下仍然可以获得发射分集增益。仿真结果表明，所提的算法比现有的算法具有较好的误码性能。

关键词: 双向中继, 对角空时码, 空间调制, 发射分集

Abstract:

In two-way relay system,focusing on the problem that using SSK transmission can not achieve the transmit diversity and has lower spectral efficiency,a diagonal space-time coded spatial modulation scheme called DSTC-SM scheme was proposed.In the DSTC-SM scheme,the source nodes transmit signals to the relay node by using the DSTC-SM codewords,and then the relay node equipped with one antenna amplifies the received signals and broadcasts them to the destination nodes.The proposed scheme uses the diagonal space-time codes as the core space-time block code (STBC) to construct the DSTC-SM codewords,and combines with SM technology to take advantage of the benefits of DSTC and SM.The antenna pairs activated in different codewords are moving cyclically along the total transmit antenna array.In addition,the rotation angles are further optimized to maximize the diversity and coding gains of the DSTC-SM codewords,so the proposed scheme can still obtain diversity gain even though only one transmit antenna is activated.Simulation results show that the proposed scheme outperforms the existing schemes.

Key words: two-way relay, diagonal space-time code, spatial modulation, transmit diversity

李峰,王磊,陈志刚. 双向中继系统中基于对角空时码的空间调制传输算法[J]. 通信学报, 2015, 36(9): 244-251.

Feng LI,Lei WANG,Zhi-gang CHEN. ce-time coded scheme for two-way relay system[J]. Journal on Communications, 2015, 36(9): 244-251.

图/表 6

图1

表1

表2

表3

图2

图3

参考文献 15

[1]	RANKOV B , WITTNEBEN A . Spectral efficient protocols for half-duplex fading relay channels[J]. IEEE J Sel Areas Commun, 2007,25(2): 379-389.
[2]	WANG R , TAO M X . Joint source and relay precoding designs for MIMO two-way relaying based on MSE criterion[J]. IEEE Trans Sig-nal Proc, 2012,60(3): 1352-1365.
[3]	CUI T , GAO F F , HO T . Distributed space-time coding for two-way wireless relay networks[J]. IEEE Trans Signal Proc, 2009,57(2): 658-671.
[4]	GONG F K , ZHANG J K , GE J H . Distributed concatenated alamouti codes for two-way relaying networks[J]. IEEE Wire Commun, 2012,1(3): 197-200.
[5]	GONG F K , ZHANG J K , GE J H . Novel distributed quasi- orthogonal space-time block codes for two-way two-antenna relay networks[J]. IEEE Wire Commun, 2013,12(9): 4338-4349.
[6]	BASAR E , üMIT A , ERDAL PANAYRC . Space-time block coded spatial modulation[J]. IEEE Trans Commun, 2011,59(3): 823-832.
[7]	LI X F , WANG L . High rate space-time block coded spatial modulation with cyclic structure[J]. IEEE Commun Lett, 2014,18(4): 532-535.
[8]	JEGANATHAN J , GHRAYEBA , SZCZECINSKI L . Generalized space shift keying modulation for MIMO channels[A]. Proc IEEE Symp Pers,Indoor and Mobile Radio Commun[C]. French Riviera,France, 2008.1-5.
[9]	YANG Y , AISSA S . Information-guided transmission in de-code-and-forward relaying systems:spatial exploitation and throughput enhancement[J]. IEEE Trans Wirel Commun, 2011,10(7): 341-2351.
[10]	SUGIURA S , CHENG SHENG , HAAS H . Coherent versus non-coherent decode-and-forward relaying aided cooperative space-time shift keying[J]. IEEE Trans Commun, 2011,59(6): 1707-1719.
[11]	YANG D , XU C , YANG L L . Transmit-diversity-assisted space-shift keying for colocated and distributed/cooperative MIMO elements[J]. IEEE Trans Veh Tech, 2011,60(6): 2864-2869.
[12]	NIKOLA S , SINAN S , MARCO R I . Dual-hop spatial modulation (Dh-SM)[A]. Proc IEEE Spring Vehicular Techn Conf[C]. Budapest, 2011.1-5.
[13]	RAED M , SALAMA I , Performance analysis of space shift keying (SSK) modulation with multiple cooperative relays[J]. EURASIP J Adv Signal Process, 2012,(4): 1-10.
[14]	XIE X Q , ZHAO Z Y , PENG M G . Spatial modulation in two way network coded channels:Performance and mapping optimization[A]. Proc IEEE Symp Pers,Indoor and Mobile Radio Commun,Sydney[C]. Budapest, 2012.72-76.
[15]	WEN M W , CHENG X , JIAO B L Use of SSK modulation in two-way amplify-and-forward relaying[J]. IEEE Trans Veh Tech, 2014,63(3): 1498-1504.

N_t	M-PSK/QAM	θ1	θ2	θ3	φ	CG
	BPSK	1.1	—	—	0.87	1.28
3	QPSK	2.75	—	—	2.36	0.15
	8-QAM	1.45	—	—	2.44	0.006 7
	BPSK	1.1	—	—	0.87	1.28
4	QPSK	2.75	—	—	2.36	0.15
	8-QAM	1.45	—	—	2.44	0.006 7
	BPSK	2.36	1.58	0.8	2.2	0.755 9
5	QPSK	0.94	1.26	0.32	2.06	0.042 2
	8-QAM	1.17	2.34	3.51	1.45	0.002
	BPSK	2.36	1.58	0.8	2.2	0.755 9
6	QPSK	0.94	1.26	0.32	2.06	0.042 2
	8-QAM	1.17	2.34	3.51	1.45	0.002

N_t	STBC-SM	DSTC-SM
3	0.5	1
4	1	1.5
5	1.5	2
6	1.5	2
7	2	2.5
8	2	2.5

N_t	SSK-TW	DSTC-SM
3	—	1
4	1	1.25
5	—	1.5
6	—	1.5
7	—	1.75
8	1.5	1.75