非正交多址中继系统复数域网络编码优化设计

doi:10.3969/j.issn.1000-436x.2012.11.009

Abstract

Abstract:

Wireless relay and network coding are two fundamental techniques to enhance the throughput of wireless communication system.The optimized design of complex field network coding scheme in non-orthogonal multiple access single relay system was addressed.Firstly,given the total transmitting power at all source nodes (equal transmitting power at every source node was assumed) and the relay node,the system might achieve the minimal symbol error probability (SEP) when the total transmitting power were equally allocated to all source nodes and relay node.Secondly,the choice of the complex field network coding coefficients plays an important role in the achieved SEP for the non-orthogonal multiple access single relay system was disclosed,and the optimized coding coefficient design in terms of the maximal coding gain were presented for arbitrary number of source nodes.It was shown that,the similarity of network coded signal of multiple source signals could be effectively avoided by using the optimized coding coefficient,which accounted for the realized performance improvement in the non-orthogonal multiple access single relay system.

Key words: non-orthogonal multiple access relay, complex field network coding, optimal power allocation, optimal coding coefficient

Xi CAI,Ping-zhi FAN,Qing-chun CHEN. Optimized design of complex field network coding scheme in non-orthogonal multiple access relay system[J]. Journal on Communications, 2012, 33(11): 67-73.

Figures/Tables 6

情况	源节点个数	调制方式	$\| A_{x} \|$	$d_{\min}^{D_{1}}$	$d_{\min}^{D_{2}}$ ^[7]
1	2	BPSK	4	$2 \sqrt{E_{b}^{S}}$	$\sqrt{2.3432 E_{b}^{R}}$
2	3	BPSK	8	$2 \sqrt{E_{b}^{S}}$	$\sqrt{1.0718 E_{b}^{R}}$
3	4	BPSK	16	$2 \sqrt{E_{b}^{S}}$	$\sqrt{0.2202 E_{b}^{R}}$
5	2	QPSK	16	$2 \sqrt{E_{b}^{S}}$	$\sqrt{0.6863 E_{b}^{R}}$
6	3	QPSK	256	$2 \sqrt{E_{b}^{S}}$	近似为0
7	4	QPSK	4096	$2 \sqrt{E_{b}^{S}}$	$\sqrt{0.0272 E_{b}^{R}}$
8	2	16QAM	256	$2 \sqrt{E_{b}^{S}}$	$\sqrt{0.0417 E_{b}^{R}}$

源节点数目	调制方式	网络编码系数	$d_{\min}^{D_{2}}$
2	BPSK	1,i]	$2 \sqrt{E_{b}^{R}}$
3	BPSK	1,0.809 0+0.587 8i,-0.809 0+0.587 8i]	$\sqrt{1.5279 E_{b}^{R}}$
4	BPSK	1,0.866 0+0.500 0i,i,0.500 0-0.866 0i]	$\sqrt{1.0717 E_{b}^{R}}$
5	BPSK	1,0.907 8+0.419 3i,-0.889 4+0.457 2i,0.707 1+0.707 1i,-0.649 4+0.760 4i]	$\sqrt{0.4924 E_{b}^{R}}$
2	QPSK	1,0.500 0-0.866 0i]	$\sqrt{1.0717 E_{b}^{R}}$
3	QPSK	1,0.953 7+0.300 7i,0.300 7+0.953 7i]	$\sqrt{0.3703 E_{b}^{R}}$
4	QPSK	1,0.989 2+0.146 6i,0.956 6+0.291 4i,-0.819 2-0.573 6i]	$\sqrt{0.0864 E_{b}^{R}}$

References 13

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