OFDM中继系统中能效优化的资源联合分配算法

doi:10.11959/j.issn.1000-436x.2015078

Abstract

Abstract:

In cooperative orthogonal frequency division multiplexing (OFDM) systems, the resource allocation rationally is significant to enhance the system performance. Aiming at maximizing the total system energy efficiency, the joint as-signment problem of relay, sub-carrier and power among users is modeled. Since the joint assignment issue subject to each user's maximal energy efficiency under minimal capacity constraints can be modeled as a NP-hard problem, a suboptimal algorithm is proposed to solve this problem. The proposed algorithm uses the conflict graph (CG) to denote the possible resource conflict relations. Then, the resource is assigned using maximal weight independent set (MWIS) algorithm. Numerical results demonstrate that the proposed algorithm (JRAA) can improve the system energy efficiency by joint assignment of relay,sub-carrier and power.

Key words: resource allocation, energy efficiency, maximum weight independent set, conflict graph, OFDM

Yun LI,Hai-xia DUAN,Kai-rong SU,Bin CAO. Resource assignments algorithm based on energy efficiency optimization in OFDM relay networks[J]. Journal on Communications, 2015, 36(3): 224-231.

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源用户ID	中继	第一时隙子载波ID	第二时隙子载波ID
1	57	47	30
2	71	41	18
3	83	46	9
4	30	48	5
5	69	49	25
6	23	24	37
7	47	44	42
8	40	45	43
9	56	36	21
10	84	31	35

参数名称	参数值
子信道带宽B	15 kHz
热噪声 n₀²=n₁²	-128.95 dBw
信号载频f	2 GHz
最大发送功率 P_max	5 dBw
最低信噪比γ	5 dB

Resource assignments algorithm based on energy efficiency optimization in OFDM relay networks

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