|
|
|
| Min-Max Fair Power and Rate Control Algorithm for Dynamic Spectrum Access |
| Gu Hong-yu;Yang Chen-yang |
| School of Electronics and Information Engineering, Beihang University, Beijing 100191, China |
|
|
|
|
Abstract In this paper, the power control problem is studied for secondary users to share primary users’ spectrum. The joint power and rate control under minimal-maximal fair criterion is formulated as a quasi-concave optimization, and an algorithm is proposed to obtain the optimal solution by iteratively solving linear programmings. Moreover, an approach is presented to estimate the link gains used in power control, the statistics of estimation error is analyzed, and the safeguard margins are used to alleviate the impact of the estimation error on the quality of service (QoS) of primary users and secondary users. Simulation results show that the proposed algorithm reduces the computation time by 50%~90% or more without performance loss, and that 1 dB interference margin and 1.5 dB signal-to-interference and noise margin are enough to guarantee the QoS of both primary and secondary users in the presence of the link gain estimation error, respectively.
|
|
Received: 09 September 2008
|
|
|
|
|
|
|
|
|
2009, Vol. 31 
