DocumentCode :
76609
Title :
Cognitive MAC protocol with minimum sampling time and cross-layer cooperation for low signal-to-noise ratio environments
Author :
Xie Xianzhong ; Hu Xiaofeng ; Yang Helin ; Ma Bin ; Lei Weijia
Author_Institution :
Chongqing Key Lab. of Mobile Commun. Technol., Chongqing Univ. of Posts & Telecommun., Chongqing, China
Volume :
10
Issue :
12
fYear :
2013
fDate :
Dec. 2013
Firstpage :
125
Lastpage :
138
Abstract :
The previous Decentralised Cognitive Medium Access Control (DC-MAC) protocol allows Secondary Users (SUs) to independently search for spectrum access opportunities without the need for a central coordinator. DC-MAC assumes that the detection scheme is ideal at the Physical (PHY) layer. In fact, a more complex detection algorithm is impractical in distributed spectrum sharing scenarios. Energy Detection (ED) at the PHY layer has become the most common method because of its low computational and implementation complexities. Thus, it is essential to integrate the DC-MAC with ED at the PHY layer. However, ED requires the Minimum Sampling Time (MST) duration to achieve the target detection probability in low Signal-to-Noise Ratio (SNR) environments. Otherwise, it cannot achieve the expected detection performance. In this paper, we derive an accurate expression of MST for ED in low SNR environments. Then, we propose an Optimised DC-MAC (ODC-MAC) protocol which is based on MST, and which amends the aforementioned problems of DC-MAC with ED. Moreover, the closed-form expressions for the unreliable data transmission probability are derived for both DC-MAC and ODC-MAC. We show that the simulation results agree well with the theoretical analyses. The proposed ODC-MAC can improve the data transmission reliability and enhance the throughput compared to the performance of the traditional DC-MAC.
Keywords :
access protocols; computational complexity; data communication; probability; radio spectrum management; telecommunication network reliability; DC-MAC protocol; MST; cognitive MAC protocol; complex detection; computational complexity; cross-layer cooperation; data transmission probability; data transmission reliability; decentralised cognitive medium access control protocol; distributed spectrum sharing; energy detection; minimum sampling time; physical layer; secondary users; signal-to-noise ratio environments; Data communication; Light emitting diodes; Media Access Protocol; Reliability; Sensors; Signal to noise ratio; Throughput; MAC; cognitive radio; energy detection; minimum sampling time; the unreliable data transmission probability; throughput;
fLanguage :
English
Journal_Title :
Communications, China
Publisher :
ieee
ISSN :
1673-5447
Type :
jour
DOI :
10.1109/CC.2013.6723885
Filename :
6723885
Link To Document :
بازگشت