基于OFDM系统的随机信道接入方案
A Random Access Mechanism Based on OFDM System
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摘要: 双忙音多址信道接入(DBTMA)协议是一种信道利用率较高的无线局域网信道随机接入控制方案。但是, 该协议的硬件实现复杂度较高。该文在对DBTMA协议进行简单修改的基础上,结合节能意识多址接入(PAMAS) 协议提出了一种基于OFDM系统的DBTMA信道接入系统,并对此系统做了简要分析。分析结果显示,该文提出的随机信道接入系统的性能良好且实现方式简单。Abstract: A MAC protocol, termed Dual Busy Tone Multiple Access(DBTMA), is a random access mechanism with high channel utilization for WLAN. However, it is difficult to realize the protocol with hardware. This paper proposes a new random access mechanism based on OFDM system by making simple modification on DBTMA and integrating it with power awase multi-access protocol with signalling. Furthermore, the new protocol is analysed and the result indicates that the proposed random access system shows well performance and is easy to be realized.
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Deng J, Haas Z J. Dual busy tone multiple access (DBTMA): A new medium access control for packet radio networks[J].IEEE ICUPC98 International Conference on Universal Personal Communications. Florence, Italy 5- 9 Oct.1998, Vol.2:973-[2]Nee R V, Prasad R. OFDM Wireless Multimedia Communications [R]. Boston: Artech House Publishers, 2000.[3]Suresh Singh, Raghavendra C. PAMAS-power aware multiaccess protocol with signalling for ad hoc networks. ACM SIGCOMM Computer Communication Review, 1998, 28(3): 5 -26.[4]Tobagi F A, Kleinrock L. Packet switching in radio channels: Part Ⅱ-The Hidden terminal problem in carrier sense multiple-access and busy-tone solution. IEEE Trans. on Communications, 1975,COM-23(12): 1417- 1433.[5]谢希仁.计算机网络(2版.大连:大连理工大学出版社,1996,第五章第四节. -
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