Multiuser Cognitive Radio Networks: An Information Theoretic Perspective
arXiv:1102.4126 · doi:10.1007/s12572-013-0079-1
Abstract
Achievable rate regions and outer bounds are derived for three-user interference channels where the transmitters cooperate in a unidirectional manner via a noncausal message-sharing mechanism. The three-user channel facilitates different ways of message-sharing between the primary and secondary (or cognitive) transmitters. Three natural extensions of unidirectional message-sharing from two users to three users are introduced: (i) Cumulative message sharing; (ii) primary-only message sharing; and (iii) cognitive-only message sharing. To emphasize the notion of interference management, channels are classified based on different rate-splitting strategies at the transmitters. Standard techniques, superposition coding and Gel'fand-Pinsker's binning principle, are employed to derive an achievable rate region for each of the cognitive interference channels. Simulation results for the Gaussian channel case are presented; they enable visual comparison of the achievable rate regions for different message-sharing schemes along with the outer bounds. These results also provide useful insights into the effect of rate-splitting at the transmitters, which aids in better interference management at the receivers.
50 pages, 15 figures, submitted to IEEE Transactions on Information Theory
References in corpus (4)
- On the Capacity of a Class of MIMO Cognitive Radios
- New inner and outer bounds for the discrete memoryless cognitive interference channel and some capacity results
- The Capacity of the Semi-Deterministic Cognitive Interference Channel and its Application to Constant Gap Results for the Gaussian Channel
- On the Sum Rate of a 2 x 2 Interference Network