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Hierarchical multi-functional layered spatial modulation

Hierarchical multi-functional layered spatial modulation
Hierarchical multi-functional layered spatial modulation
In pursuit of optimal Index Modulation (IM)-aided Multiple-Input Multiple-Output (MIMO) systems, where information is implicitly conveyed by relying on the on/off mechanism of the system’s components in addition to the classical amplitude, phase or frequency components, we present in a tutorial style our novel Multi-Functional (MF) architecture of Layered Multi- Set (LMS) modulation. This generalized framework subsumes various MIMO techniques exhibiting different multiplexing and diversity functionalities. Our LMS design relies on three constituents, namely the space-time (ST) unit, the layered unit as well as the spatial switching unit. More specifically, the ST unit relies on the Generalized Space-Time Shift Keying (GSTSK) scheme, where P – rather than one – out of Q ST dispersion matrices are selected for dispersing an equivalent number of PSK/QAM symbols across the antennas and time-slots. In the layered unit, multiple GSTSK codewords are stacked within the layers of codewords spread over time and space. The spatial switching unit activates Nt c out of Nt transmit antennas. Owing to its hierarchical MF architecture, our LMS system strikes a flexible design trade-off between the achievable throughput as well as the attainable diversity gain and it can potentially subsume various conventional MIMO schemes, such as Bell Lab’s Layered Space- Time (BLAST), Space-Time Block Codes (STBCs), Layered Steered Space-Time Codes (LSSTCs), Spatial Modulation (SM), Space-Shift Keying (SSK), Linear Dispersion Codes (LDCs), Generalized SM (GSM), STSK, GSTSK, Quadrature SM (QSM) as well as Multi-Set STSK (MS-STSK). Additionally, we derive the LMS system’s Discrete-input Continuous-output Memoryless Channel (DCMC) capacity, which encompasses the capacity limit of all the LMS subsidiaries. We also propose a two-stage serially concatenated soft-decision (SD) based LMS detector by relying on an inner and an outer decoder that iteratively exchange their extrinsic information in order to achieve a near-capacity performance. Last but not least, we utilize the EXtrinsic Information Transfer (EXIT) charts for analyzing the convergence behavior of our SD-aided coded LMS scheme.
2169-3536
Hemadeh, Ibrahim A.
6576ce7e-fe4c-4f4d-b5db-84935f38cd9c
El-Hajjar, Mohammed
3a829028-a427-4123-b885-2bab81a44b6f
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Hemadeh, Ibrahim A.
6576ce7e-fe4c-4f4d-b5db-84935f38cd9c
El-Hajjar, Mohammed
3a829028-a427-4123-b885-2bab81a44b6f
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1

Hemadeh, Ibrahim A., El-Hajjar, Mohammed and Hanzo, Lajos (2018) Hierarchical multi-functional layered spatial modulation. IEEE Access. (doi:10.1109/ACCESS.2018.2802863).

Record type: Article

Abstract

In pursuit of optimal Index Modulation (IM)-aided Multiple-Input Multiple-Output (MIMO) systems, where information is implicitly conveyed by relying on the on/off mechanism of the system’s components in addition to the classical amplitude, phase or frequency components, we present in a tutorial style our novel Multi-Functional (MF) architecture of Layered Multi- Set (LMS) modulation. This generalized framework subsumes various MIMO techniques exhibiting different multiplexing and diversity functionalities. Our LMS design relies on three constituents, namely the space-time (ST) unit, the layered unit as well as the spatial switching unit. More specifically, the ST unit relies on the Generalized Space-Time Shift Keying (GSTSK) scheme, where P – rather than one – out of Q ST dispersion matrices are selected for dispersing an equivalent number of PSK/QAM symbols across the antennas and time-slots. In the layered unit, multiple GSTSK codewords are stacked within the layers of codewords spread over time and space. The spatial switching unit activates Nt c out of Nt transmit antennas. Owing to its hierarchical MF architecture, our LMS system strikes a flexible design trade-off between the achievable throughput as well as the attainable diversity gain and it can potentially subsume various conventional MIMO schemes, such as Bell Lab’s Layered Space- Time (BLAST), Space-Time Block Codes (STBCs), Layered Steered Space-Time Codes (LSSTCs), Spatial Modulation (SM), Space-Shift Keying (SSK), Linear Dispersion Codes (LDCs), Generalized SM (GSM), STSK, GSTSK, Quadrature SM (QSM) as well as Multi-Set STSK (MS-STSK). Additionally, we derive the LMS system’s Discrete-input Continuous-output Memoryless Channel (DCMC) capacity, which encompasses the capacity limit of all the LMS subsidiaries. We also propose a two-stage serially concatenated soft-decision (SD) based LMS detector by relying on an inner and an outer decoder that iteratively exchange their extrinsic information in order to achieve a near-capacity performance. Last but not least, we utilize the EXtrinsic Information Transfer (EXIT) charts for analyzing the convergence behavior of our SD-aided coded LMS scheme.

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Accepted/In Press date: 29 January 2018
e-pub ahead of print date: 5 February 2018

Identifiers

Local EPrints ID: 417726
URI: https://eprints.soton.ac.uk/id/eprint/417726
ISSN: 2169-3536
PURE UUID: c5e90286-3907-4df8-ab68-45ed8840a64a
ORCID for Mohammed El-Hajjar: ORCID iD orcid.org/0000-0002-7987-1401
ORCID for Lajos Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

Catalogue record

Date deposited: 12 Feb 2018 17:30
Last modified: 03 Mar 2018 17:30

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Contributors

Author: Ibrahim A. Hemadeh
Author: Mohammed El-Hajjar ORCID iD
Author: Lajos Hanzo ORCID iD

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