Wireless communication system using hybrid cooperative and noncooperative sensing

摘要: A combination of cooperative and non-cooperative sensing methods improves spectrum utilization by switching network nodes not interfering with both primary system secondary users to mode. The method then keeps record the number times result a node matches or differs from sensing. Also, sets thresholds shift register values determine when switch back forth between non modes, sending control messages let user access spectrum. In present disclosure two antenna are considered for each separate types broadcast reply messages.