On the Capacity Region for Cognitive Multiple Access over White Space Channels

Details On the Capacity Region for Cognitive Multiple Access over White Space Channels On the Capacity Region for Cognitive Multiple Access over White Space Channels

2012-02-10

arxiv.org/abs/1202.2175v1

Computer Science

Information Theory

Scientific paper

Cognitive Radio (CR) has stirred great interest with its potential to exploit the already scarce spectrum resource. The cognitive multiple access channels (CogMAC) are commonly seen in many applications, such as the Cognitive Radio Sensor Networks (CRSN), and the 802.22 cognitive Wireless Regional Area Networks (WRAN). In this paper, the primary user (PU) activities are treated as on/off side information, which can be obtained causally or non-causally. The cognitive MAC channels are then modeled as multi-switch channels and their rate regions are characterized. Explicit forms of outer and inner bounds of this rate region are derived by assuming additional side information, and they are shown to be tight in some special cases. An optimal rate and power allocation scheme that maximizes the sum rate is also proposed. The numerical results show the importance of side information in enhancing the capacity and the effectiveness of our rate allocation scheme.

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