Abstract-In this paper, a cognitive-radio-inspired asymmetric network coding (CR-AsNC) scheme is proposed for multipleinput-multiple-output (MIMO) cellular transmissions, where information exchange among users and base-station (BS) broadcasting can be accomplished simultaneously. The key idea is to apply the concept of cognitive radio (CR) in network coding transmissions, where the BS tries sending new information while helping users' transmissions as a relay. In particular, we design an asymmetric network coding method for information exchange between the BS and the users, although many existing works consider the design of network coding in symmetric scenarios. To approach the optimal performance, an iterative precoding design for CR-AsNC is first developed. Then, a channeldiagonalization-based precoding design with low complexity is proposed, to which power allocation can be optimized with a closed-form solution. The simulation results show that the proposed CR-AsNC scheme with precoding optimization can significantly improve system transmission performance. Index Terms-Multiple-input-multiple-output (MIMO), multiway transmission, network coding, precoding design.
In REF , the authors aim to minimize the mean square error at the destinations and design an asymmetric network coding solution for data transmission between the BS and the users.
On the Design of Cognitive-Radio-Inspired Asymmetric Network Coding Transmissions in MIMO Systems
IEEE Transactions on Vehicular Technology
IEEE Transactions on Vehicular Technology
Computer Science