Title :
Throughput Analysis for a Multi-User, Multi-Channel ALOHA Cognitive Radio System
Author :
Li, Xiaofan ; Liu, Hui ; Roy, Sumit ; Zhang, Jianhua ; Zhang, Ping ; Ghosh, Chittabrata
Author_Institution :
Key Lab. of Universal Wireless Commun. for the Minist. of Educ., Beijing Univ. of Posts & Telecommun., Beijing, China
fDate :
11/1/2012 12:00:00 AM
Abstract :
In this paper, we investigate a novel slotted ALOHA-based distributed access cognitive network in which a secondary user (SU) selects a random subset of channels for sensing, detects an idle (unused by licensed users) subset therein, and transmits in any one of those detected idle channels. First, we derive a range for the number of channels to be sensed per SU access. Then, the analytical average system throughput is attained for cases where the number of idle channels is a random variable. Based on that, a relationship between the average system throughput and the number of sensing channels is attained. Subsequently, a joint optimization problem is formulated in order to maximize average system throughput. The analytical results are validated by substantial simulations.
Keywords :
access protocols; cognitive radio; optimisation; wireless channels; SU access; idle channel detection; joint optimization problem; multiuser multichannel ALOHA cognitive radio system; random channels subset; secondary user; sensing channels; slotted ALOHA-based distributed access cognitive network; throughput analysis; Media Access Protocol; Optimization; Random variables; Sensors; Throughput; Wireless communication; Wireless sensor networks; Cognitive radio; distributed system; multi-channels; number of sensing channels; throughput analysis;
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/TWC.2012.092112.111425
