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 Ntc 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.
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).
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 Ntc 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: http://eprints.soton.ac.uk/id/eprint/417726
ISSN: 2169-3536
PURE UUID: c5e90286-3907-4df8-ab68-45ed8840a64a
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Date deposited: 12 Feb 2018 17:30
Last modified: 18 Mar 2024 03:22
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Author:
Ibrahim A. Hemadeh
Author:
Mohammed El-Hajjar
Author:
Lajos Hanzo
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