... “System design issues and perfor-mance evaluations for adaptive modulation in new wirelessaccess systems,” Proceedings of the IEEE, vol. 95, no. 12, pp. 245 6– 247 1, 2007. [4] Q. Liu, S. Zhou, and ... overwireless links,” IEEE Transactions on Wireless Communications,vol. 3, no. 5, pp. 1 746 –1755, 20 04. [5] J. M. Peha, “Approaches to spectrum sharing,” IEEE Commu-nications Magazine, vol. 43 , no. 2, ... “Spectrum pooling: an innova-tive strategy for the enhancement of spectrum efficiency,” IEEE Communications Magazine, vol. 42 , no. 3, pp. S8–S 14, 20 04. [7] M. Gastpar, “On capacity under received-signal...