The essential problem of Spectrum Sensing Cognitive Radio is in designing high quality spectrum sensing devices and algorithms for exchanging spectrum sensing data between nodes. Applications of Spectrum Sensing Cognitive Radio include emergency networks and WLAN higher throughput and transmission distance extensions. Engineers are now working to bring that kind of flexible operating intelligence to future radios, cell phones and other wireless communications devices. During the coming decade, cognitive radio technology should enable nearly any wireless system to locate and link to any locally available unused radio spectrum to best serve the consumer. It is proposed to investigate and develop cognitive radio algorithms to enable co-existence between IEEE 802.11b and 802.16a networks in the same unlicensed band. In particular, a system model would be developed in which the two wireless systems share radio resources in frequency, space and time, and coordination methods will be used to reduce the mutual interference and improve link throughput. The cognitive radio schemes will utilize the available degrees of freedom in frequency, power and time, and react to observations in these dimensions to avoid interference.