Performance Enhancement of MLD with Parallel Interference Canceller by Unequal-Power Transmission in MIMO Systems

Masaaki FUJII  

IEICE TRANSACTIONS on Communications   Vol.E89-B    No.4    pp.1447-1450
Publication Date: 2006/04/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.4.1447
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
MIMO,  MLD,  QRM-MLD,  parallel interference cancellation,  unequal-power transmission,  

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This letter describes unequal-power transmission for multiple-input and multiple-output (MIMO) systems with a parallel interference canceller (PIC) applied to a maximum likelihood detector (MLD) or complexity-reduced MLD at the receiver. Unequal-power transmission reduces the possibility that all substreams are incorrectly decoded. Canceling the correctly decoded substreams enables more reliable detection in the next stage. The simulation results demonstrated that unequal-power transmission improves the transmission performance of the PIC applied to MLDs or complexity-reduced MLDs, compared with equal-power transmission cases.