Making optimal use of the asymmetric interference channel

The asymmetric interference channel is an appropriate model for many realistic scenarios, especially those arising more frequently as dynamic spectrum access (DSA) becomes more prevalent. As DSA nodes evolve to become more cognitive (e.g. self aware, environment aware, and adaptive), the prevailing white space seeking and gray space adapting policies leave a significant portion of the spectrum, namely, the black space, untapped [10]. This paper offers a throughput versus SINR result and corresponding technique for jointly choosing the transmission rate and multiuser detection algorithm that allows computationally constrained cognitive DSA nodes high rate operation in spectrum black space. In addition, this paper derives an information theoretic motivated policy for seemingly insignificant waveform design choices that greatly enhance the throughput of a secondary sender-receiver pair while fulfilling a given complexity requirement within the secondary node´s receiver. This paper shows typical throughput improvements of 10 to 50 times when using this technique over the traditional approach to maintaining a disadvantaged link within an asymmetric interference channel.