基于信道状态感知的多信道认知多址接入协议

doi:10.3969/j.issn.1000-436x.2014.04.008

Abstract

Abstract:

For multi-channel cognitive radio network (CRN), the inconsistent transmission conditions of common control channel (CCC) and data channels deteriorate the performance of cognitive MAC protocols. Focusing on this problem, a novel channel aware multi-channel cognitive MAC protocol (CAM-MAC) was proposed, which consists of two-level four-way handshaking mechanism. The first level two-way handshaking was optimized to reduce the mean successful reservation time on CCC. The other level two-way handshaking was implemented by a cross-layer approach to adopt the adaptive transmission based on instantaneous SNR on each Nakagami fading data channel to improve the data rate. These mechanisms improve the performance of CAM-MAC. Simulation results validate the throughput of CAM-MAC outper-forms that of the existing one, about 50% improvement in the throughput under certain conditions.

Key words: multichannel MAC protocol;, adaptive transmission, cognitive radio networks, dynamic spectrum access

Liang WANG,Min SHENG,Yan ZHANG,Xiao MA. CAM-MAC: channel aware multi-channel MAC protocol in cognitive radio network[J]. Journal on Communications, 2014, 35(4): 65-73.

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References 13

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参数名称	取值	解释
RTS	30 byte	RTS帧长
CTS	30 byte	CTS帧长
CT	20 byte	CT帧长
TP	20 byte	TP帧长
ACK	20 byte	ACK帧长
SIFS	16 μs	短帧间隔
DIFS	34 μs	DCF帧间隔
σ	9 μs	时隙长度
RC	1 Mbit/s	控制信道速率
CW_max	1 024	最大退避窗值

M-QAM	使用概率	信噪比范围/dB
信道中断	0.118 3	0≤γ＜21
BPSK	0.210 1	21≤γ＜26
4-QAM	0.303 7	26≤γ＜30.2
8-QAM	0.231 9	30.2≤γ＜33
16-QAM	0.136 0	γ≥33

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CAM-MAC: channel aware multi-channel MAC protocol in cognitive radio network

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