Application of an Iterative Soft V-BLAST Detector for Spatial Diversity in Adaptive MIMO-OFDM Systems
https://doi.org/10.32603/1993-8985-2026-29-3-6-21
Abstract
Introduction. Conventional implementations of adaptive MIMO-OFDM make suboptimal use of computational resources, as they require parallel execution of distinct algorithmic architectures: Space-Time Block Coding (STBC) for transmission reliability and spatial multiplexing for increased throughput. Consequently, the algorithmic development of a unified signal-processing architecture remains an open problem.
Aim. This study develops and evaluates a unified adaptive MIMO-OFDM architecture that eliminates dedicated hardware STBC encoders from the transmit chain. This is achieved by compensating for the loss of orthogonality through an iterative receiver with soft interference cancellation while maintaining stable channel adaptation.
Materials and methods. The proposed algorithm performs iterative soft-information exchange between a Soft V-BLAST detector and a Low-Density Parity-Check (LDPC) decoder. Its performance was evaluated through computer simulation against established reference schemes. To assess operability under non-stationary conditions, a link-adaptation algorithm for the Modulation and Coding Scheme (MCS) was implemented using the block-error-rate criterion.
Results. The proposed iterative receiver achieves BER performance comparable to that of conventional STBC schemes within two iterations, without employing orthogonal transmit coding. Integrating the detector into the adaptation loop enables dynamic maintenance of a target error rate, effectively trading the diversity gain for increased channel throughput.
Conclusion. The proposed unified architecture enables software-defined adjustment of the transmission strategy from maximum reliability to maximum spectral efficiency within a single algorithmic core, thereby minimizing computational and logic-resource overhead in transceiver implementation.
About the Authors
Q. C. Pham
The Bonch-Bruevich Saint Petersburg State University of Telecommunications
Russian Federation
Russian Federation
Quyen Cong Pham, Specialist in Special radio engineering systems (2024, Military Order of Zhukov University of Radio Electronics (Cherepovets)), Postgraduate student
22, Bolshevikov Ave., Saint Petersburg 193232
E. I. Glushankov
The Bonch-Bruevich Saint Petersburg State University of Telecommunications
Russian Federation
Russian Federation
Evgeny I. Glushankov, Dr Sci. (Eng.) (1991), Professor (1994), Professor of the Department of Radio Engineering
22, Bolshevikov Ave., Saint Petersburg 193232
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Review
For citations:
Pham Q., Glushankov E.I. Application of an Iterative Soft V-BLAST Detector for Spatial Diversity in Adaptive MIMO-OFDM Systems. Journal of the Russian Universities. Radioelectronics. 2026;29(3):6-21. (In Russ.) https://doi.org/10.32603/1993-8985-2026-29-3-6-21
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