On the capacity of partially cognitive radios

Authors:
G. Chung;S. Sridharan;S. Vishwanath;C. S. Hwang
Affiliations:
Wireless Networking and Communication Group, University of Texas at Austin, Austin, TX;Wireless Networking and Communication Group, University of Texas at Austin, Austin, TX;Wireless Networking and Communication Group, University of Texas at Austin, Austin, TX;Communication Lab., SAIT, Samsung Electronics Co. Ltd., Yongin, Korea
Venue:
ISIT'09 Proceedings of the 2009 IEEE international conference on Symposium on Information Theory - Volume 1
Year:
2009

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Abstract

This paper considers the problem of cognitive radios with partial message information. Here, an interference channel setting is considered where one transmitter (the "cognitive" one) knows the message of the other ("legitimate" user) partially. An outer bound on the capacity region of this channel is found for the "weak" interference case (where the interference from the cognitive transmitter to the legitimate receiver is weak). This outer bound is shown for both the discrete-memoryless and the Gaussian channel cases. An achievable region is subsequently determined for a Gaussian partially cognitive-radio channel. The achievable strategy described in this paper is a combination of superposition and dirty paper coding.