access icon free QOSTBC coded MIMO system with reduced complexity and optimised decoding for rank deficient channels

© The Institution of Engineering and Technology
Received 12/10/2018, Accepted 20/11/2019, Revised 04/10/2019, Published 26/11/2019

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.

Inspec keywords: space-time block codes; decoding; receiving antennas; transmitting antennas; communication complexity; maximum likelihood detection; search problems; channel coding; error statistics; antenna arrays; MIMO communication

Other keywords: multiple-input multiple-output systems; bit error rate; zero diagonal elements; sphere decoder; symbol rate-2; single symbol maximum likelihood detection; Cholesky decomposition; receiving antennas; rank deficiency problem; QOSTBC coded MIMO system; rank deficient channels; quasiorthogonal space-time block code; transmitting antennas; modified double-layer SD detection; search radii optimisation

Subjects: Combinatorial mathematics; Optimisation techniques; Signal detection; Codes; Antenna arrays; Radio links and equipment; Other topics in statistics

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