An Ordering Scheme Exploiting Modulation Information for Tree Search Based Detection in Interference-Limited MIMO Systems

作者：Zhou Guangxia^*; Xu Wen; Bauch Gerhard

来源：IEEE Wireless Communications Letters, 2013, 2(1): 2-5.

DOI：10.1109/WCL.2013.011713.120760

• MIMO systems
• V-BLAST
• joint detection
• sphere decoder
• detection ordering
• inter-cell interference

The well-known vertical Bell Labs layered spacetime (V-BLAST) ordering has been widely employed for tree search algorithms such as sphere decoder. The V-BLAST ordering was derived under the assumption that all transmitted symbols utilize the same modulation. In an interference-limited scenario, a cell-edge user probably receives serving and interfering signals with different modulations. In this case, the conventional V-BLAST ordering does not provide a satisfactory solution for complexity reduction. This letter shows how to incorporate the modulation information into the V-BLAST ordering to significantly reduce the complexity of the tree search algorithms. Simulation results show the new ordering based sphere decoder can provide a better trade-off between complexity (e.g., in terms of operations) and performance (e.g., in terms of throughput or error rate) in the interference-limited scenario.

• 出版日期2013-2