Abstract
In this work, novel cooperative communication strategies like Decode and Forward based relay schemes, joint maximum likelihood signal detection in combinational Multiple Input Multiple Output (MIMO) cooperative relay cognitive networks are used. The joint cooperative signal detection using Maximum-Likelihood (ML) detector at each relays, and associated path links improves the quality of services at the destination node, which can be dynamically altered using different relay combinations and associated iterative computational complexity accumulated during ML detection. Here the relay performs ML decoding and transmit the detected symbols to the destination and also to the multiple antennas equipped for cooperative communication. The same ML detection at the destination combines the MIMO based diversity to narrow down the error probability among different orthogonal transmissions. The combination of iterative signal detection and relay assisted decoding scheme shows superior error rate performance when compared to non-iterative hard decoded signal detection. The simulations results proved the influence of MIMO assisted cooperative communication and the associated performance penalty gaps that come with imperfect channel state information at the destination node.
Highlights
Cognitive Radio (CR) improves the radio spectrum utilization and offers highly reliable communication for generation wireless communication systems
Cooperative Communication Schemes (CCS) [3] is widely in many wireless communication applications to overcome the shortage of this limited source
In [10], it is discussed about Multiple Input Multiple Output (MIMO) cooperative communication in cognitive radio relay network is systematized by using multiple antennas at the site of Secondary User Transmitter (ST) and operating Amplify-and-Forward transmission in a half-duplex mode
Summary
Cognitive Radio (CR) improves the radio spectrum utilization and offers highly reliable communication for generation wireless communication systems. Even though CCS employ relay based nodes, throughput rate in terms of packet delivery ratios and a feasible amount of Quality of Services (QoS) could not be attained due to poor channel links between source to the destination. To address these problems, Manuscript received on April 22, 2021. The received demodulation symbols at relay are erroneous because of the path link quality and the desired diversity gain is not achieved in real time To tackle these gaps, Decode-and-Forward protocol is formulated. To attain a considerable diversity gain at the relay nodes, it is enabled to use virtual MIMO system rather than using multiple antennas and by doing so a stealthy performance metric might be got out with multiple collaborative nodes using AF protocol
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