OFDM中继网络随机接入协议研究
首发时间:2009-11-20
摘要:本文给出了一种基于OFDM系统的中继网络随机接入协议——业务区分随机接入(SDRA)协议。该协议采用TDD-OFDMA(时分双工—正交频分复用多址)的多址方式,将接入业务按照对时延要求的不同分为实时业务和非实时业务,并采用不同的接入方式实现接入。通过理论和仿真性能分析可知,相对于一般的随机接入协议,提出的SDRA协议能够有效地提高业务的接入成功率、降低平均接入时延,在保证了实时业务的服务质量(QoS)的同时也提高了非实时业务的接入性能。
关键词: 业务区分随机接入协议 OFDM系统 中继网络 随机接入
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Random Access Protocol Research of OFDM Relay Networks
Abstract:In this paper, a Service Differentiated Random Access (SDRA) protocol is proposed. The protocol is based on TDD-OFDMA (Time Divided Duplex—Orthogonal Frequency Division Multiplexing Access), and the services in the network are differentiated into real-time services and non real-time services according to the requirements of delay, which will adopt different access mode. As illustrated by the theoretical analyses and simulation results the proposed SDRA protocol can effectively improve successful access rate and reduce average access delay for both the real-time services and the non real-time services.
Keywords: Service Differentiated Random Access (SDRA) OFDM system Relay network Random access
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