In this paper, modulation diversity is incorporated into an underlay cognitive relay network where a secondary source communicates with the secondary destination directly and via an intermediate secondary relay. Modulation diversity is employed both at the secondary source and the secondary relay, where it rotates and interleaves the signal components before transmission to enhance the diversity order as well as the system's performance. Due to the modulation diversity, source and relay transmit different symbols to the destination that improves the mutual information of the system and the conditional probability of error, therefore its performance analysis and results are different than the conventional underlay cognitive relay network. Exact outage probability of the proposed system is derived and validated with Monte Carlo simulations. Moreover, error probability of the system is derived and compared with the computer simulations. Furthermore, interference power constraints and correlation among received signal-to-noise ratios are considered in all of the performance analysis to accurately analyze the proposed system.
Underlay Cognitive Relay Network with Modulation Diversity
2018-08-01
158487 byte
Conference paper
Electronic Resource
English
Modulation Identification of MQAM Signals in Underlay Cognitive Radios
British Library Online Contents | 2018
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