Limited-rate feedback resource allocation algorithm based on MIMO-OFDM for cognitive radio systems
Xiaofei Zhang · Journal of Communications · 2010
Limited-rate feedback resource allocation algorithm was proposed for cognitive radio systems based on multiple-input multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) technology considering the trellis coded modulation.Firstly,the algorithm defined the effective set of transmission mode per user.Secondly,it allocated the resource allocation with the goal of maximizing the collaborative awareness group throughput according to the function of link quality indicator.Thirdly,it reallocated the subcarriers and power among the cognitive users with the goal of guaranteeing the cognitive users to access the spectrum fairly.Finally,it updated the Lagrange multipliers utilizing stochastic approximation tools and obtained the asymptotic convergence solution of resource allocation by means of on-line recursion.Simulations corroborate that the algorithm not only improves the throughput of collaborative awareness group effectively but also ensures the cognitive users to access the spectrum fairly,while requiring low feedback overhead.