NDLI: QOSTBC coded MIMO system with reduced complexity and optimised decoding for rank deficient channels

Content Provider	IET Digital Library
Author	Gupta, Bhasker Balyan, Vipin Saini, Davinder S.
Abstract	In multiple-input multiple-output (MIMO) systems, rank deficient channels are the most common and key areas of research. In these channels, the number of transmit antennas (M Tx) is higher than receive antennas (M Rx) and subsequently the unknown variables are more than the number of equations. In such situations, the conventional sphere decoder (SD) fails due to the presence of zero diagonal elements in Cholesky decomposition. This study analyses the quasi-orthogonal space-time block code (QOSTBC) of symbol rate-2 for M Tx = 4 with modified double-layer SD detection to overcome rank deficiency problem. The first half of transmitted symbols is detected using two partially dependent SDs with optimised search radii. The remaining half is detected by employing single symbol maximum likelihood detection. Simulation and analytical results indicate that the proposed detection scheme reduces bit error rate and complexity compared to existing techniques.
Starting Page	646
Ending Page	654
Page Count	9
ISSN	17518628
Volume Number	14
e-ISSN	17518636
Issue Number	Issue 4, Mar (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/14/4
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2018.6014
Journal	IET Communications
Publisher Date	2019-11-26
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Antenna Array Bit Error Rate Channel Coding Cholesky Decomposition Code Combinatorial Mathematics Communication Complexity Decoding Error Statistics Maximum Likelihood Detection MIMO Communication Modified Double-layer SD Detection Multiple-input Multiple-output System Optimisation Technique QOSTBC Coded MIMO System Quasiorthogonal Space-time Block Code Radio Link And Equipment Rank Deficiency Problem Rank Deficient Channel Receiving Antenna Search Problem Search Radii Optimisation Signal Detection Single Symbol Maximum Likelihood Detection Space-time Block Code Sphere Decoder Statistics Symbol Rate-2 Transmitting Antenna Zero Diagonal Element
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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