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Supported by the National Natural Science Fund(NSFC) Project Theoretical Designing of Multi-Layer Cooperative Wireless Networks (Award No.:60472027) and the NSFC-RGC (Research Grants Council of Hong Kong) joint research project Cooperation and Cross-layer Design in Cognitive Radio Systems(Award“,”Supported by the National Natural Science Fund(NSFC) Project Theoretical Designing of Multi-Layer Cooperative Wireless Networks (Award No.:60472027) and the NSFC-RGC (Research Grants Council of Hong Kong) joint research project Cooperation and Cross-layer Design in Cognitive Radio Systems(Award