These cooperations are facilitated by dynamically and opportunistically assigning one of the secondary users as a relay to assist the other one, which results in more efficient spectrum hole detection. Also, we investigate the impact of erroneous

基于MIMO系统信道容量公式的推倒来推倒协作系统遍历性容量公式，介绍的很详细。-MIMO system channel capacity based on the formula down to tear down the cooperative system ergodic capacity formula, described in great detail.

The Combination Algorithm for Total Optimisation (CAT) is proposed to support smooth upgrading of third generation systems and to fulfil the requirements of current cellular networks. The CAT algorithm solves the problem of base-station locat