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Sugiura S.,Toyota Central RandD Laboratories Inc. | Chen S.,University of Southampton | Hanzo L.,University of Southampton
IEEE Communications Surveys and Tutorials | Year: 2012

In this tutorial, we first review the family of conventional multiple-antenna techniques, and then we provide a general overview of the recent concept of the powerful Multiple-Input Multiple-Output (MIMO) family based on a universal Space-Time Shift Keying (STSK) philosophy. When appropriately configured, the proposed STSK scheme has the potential of outperforming conventional MIMO arrangements. © 1998-2012 IEEE.


Sugiura S.,Toyota Central RandD Laboratories Inc. | Chen S.,University of Southampton | Hanzo L.,University of Southampton
IEEE Communications Surveys and Tutorials | Year: 2012

In this treatise, we firstly review the associated Multiple-Input Multiple-Output (MIMO) system theory and review the family of hard-decision and soft-decision based detection algorithms in the context of Spatial Division Multiplexing (SDM) systems. Our discussions culminate in the introduction of a range of powerful novel MIMO detectors, such as for example Markov Chain assisted Minimum Bit-Error Rate (MC-MBER) detectors, which are capable of reliably operating in the challenging high-importance rank-deficient scenarios, where there are more transmitters than receivers and hence the resultant channel-matrix becomes non-invertible. As a result, conventional detectors would exhibit a high residual error floor. We then invoke the Soft-Input Soft-Output (SISO) MIMO detectors for creating turbo-detected two- or three-stage concatenated SDM schemes and investigate their attainable performance in the light of their computational complexity. Finally, we introduce the powerful design tools of EXtrinsic Information Transfer (EXIT)-charts and characterize the achievable performance of the diverse near-capacity SISO detectors with the aid of EXIT charts. © 1998-2012 IEEE.


Sugiura S.,Toyota Central RandD Laboratories Inc.
IEEE Communications Letters | Year: 2011

In this Letter, we introduce an efficient dispersion-matrix optimization technique for the recent concept of Space-Time Shift Keying (STSK). By exploiting the STSK-specific signal structure relying on the dispersion-matrix activation, rather than the classic spatial multiplexing, computational complexity imposed by the system optimization is reduced by tens of times, in comparison to that of the conventional approach. Our simulation results reveal that the proposed technique substantially reduces computational cost and time required for the dispersion-matrix optimization, which is especially beneficial for large search-space scenarios, such as a high number of transmit antennas, symbols per space-time block and constellation points. © 2011 IEEE.


Sugiura S.,Toyota Central RandD Laboratories Inc. | Hanzo L.,University of Southampton
IEEE Transactions on Wireless Communications | Year: 2013

Joint dispersion-matrix and constellation optimization algorithm is proposed, which is invoked for the recent space-time shift keying (STSK) scheme. More specifically, the theoretical gradients of the discrete-input continuous-output memoryless channel's (DCMC) capacity with respect to both a dispersion-matrix set and to the modem constellations are derived, which allows a substantial reduction in the computational complexity required for maximizing the system's capacity. Furthermore, we also conceive a near-capacity irregular-precoded STSK (IR-PSTSK) architecture, which is designed with the aid of extrinsic information transfer (EXIT) charts, while invoking STSK subcodes, which are optimized by using the proposed algorithm. © 2013 IEEE.


Sugiura S.,Toyota Central RandD Laboratories Inc. | Hanzo L.,University of Southampton
IEEE Signal Processing Letters | Year: 2012

In this letter, we investigate the effects of training-based channel estimation on the achievable performance of the recent spatial modulation (SM) based multiple-input multiple-output (MIMO) scheme. This is motivated by the fact that the SM transmitter is constituted by a single radio-frequency (RF) branch and multiple antenna elements (AEs), hence simultaneous pilot transmissions from the AEs are impossible, unlike in the classic multiple-RF MIMO transmitters. Our simulation results demonstrate that the SM scheme's BER curve exhibits a performance penalty, while relying on realistic imperfect channel-estimation. In order to combat these limitations, we propose two single-RF arrangements, namely a reduced-complexity joint channel estimation and data detection aided SM scheme as well as a non-coherently detected single-RF space-time shift keying scheme dispensing with channel estimation. © 1994-2012 IEEE.

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