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Hybrid automatic-repeat-reQuest systems for cooperative wireless communications

Hybrid automatic-repeat-reQuest systems for cooperative wireless communications
Hybrid automatic-repeat-reQuest systems for cooperative wireless communications
As a benefit of achieving a diversity gain and/or a multiplexing gain, MIMO techniques are capable of significantly increasing the achievable throughput and/or the network coverage without additional bandwidth or transmit power. For the sake of striking an attractive trade-off between the attainable diversity gain and/or multiplexing gain, in this thesis the novel Space-Time-Frequency Shift Keying (STFSK) concept is proposed for the family of MIMO systems. More specifically, in order to generate space-time-frequency domain codewords, the STFSK encoding schemes activate one out of Q dispersion matrices, and the associated address bits are then combined with a classic time-domain and frequency-domain modulation scheme. The resultant arrangements impose no inter-symbol interference and are capable of eliminating the inter-antenna interference, hence offering a range of benefits over other classic MIMO arrangements. Additionally, a soft-output STFSK demodulator is designed for iterative detection and the complexity of both the hard- as well as soft-decision demodulators is quantified. Furthermore, the STFSK performance is studied in both the single-user and the multipleuser multi-cell environment in order to investigate the effects of these techniques on the performance of the holistically optimized systems.

Furthermore, we studied the H-ARQ systems advocated in the context of cooperation-aided wireless networks, where the MIMO elements are constituted by the individual elements of separate network nodes. Both perfect and imperfect coherent detection as well as non-coherent detection aided cooperative H-ARQ schemes are considered. In the perfect coherent detection based pilot symbol assisted scheme, a novel relay-switching aided H-ARQ scheme is proposed for mitigating the effects of correlation in fading wireless channels, followed by a H-ARQ scheme employing systematic Luby transform codes. In contrast to the unrealistic perfect coherent detection, realistic imperfect coherent schemes are studied, where the channel impulse responses are imperfectly estimated. Furthermore, non-coherent differential detection aided cooperative H-ARQ schemes are proposed and compared to their coherent detection assisted counterparts. Finally, a novel cooperative H-ARQ arrangement based on distributed space-time codes is proposed for the sake of improving the attainable system throughput, while reducing the system’s complexity.
Ngo, Hoang Anh
c7839dbb-8b72-4376-9f70-0ab7dd5ce400
Ngo, Hoang Anh
c7839dbb-8b72-4376-9f70-0ab7dd5ce400
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1

Ngo, Hoang Anh (2012) Hybrid automatic-repeat-reQuest systems for cooperative wireless communications. University of Southampton, School of Electronics and Computer Science, Doctoral Thesis, 278pp.

Record type: Thesis (Doctoral)

Abstract

As a benefit of achieving a diversity gain and/or a multiplexing gain, MIMO techniques are capable of significantly increasing the achievable throughput and/or the network coverage without additional bandwidth or transmit power. For the sake of striking an attractive trade-off between the attainable diversity gain and/or multiplexing gain, in this thesis the novel Space-Time-Frequency Shift Keying (STFSK) concept is proposed for the family of MIMO systems. More specifically, in order to generate space-time-frequency domain codewords, the STFSK encoding schemes activate one out of Q dispersion matrices, and the associated address bits are then combined with a classic time-domain and frequency-domain modulation scheme. The resultant arrangements impose no inter-symbol interference and are capable of eliminating the inter-antenna interference, hence offering a range of benefits over other classic MIMO arrangements. Additionally, a soft-output STFSK demodulator is designed for iterative detection and the complexity of both the hard- as well as soft-decision demodulators is quantified. Furthermore, the STFSK performance is studied in both the single-user and the multipleuser multi-cell environment in order to investigate the effects of these techniques on the performance of the holistically optimized systems.

Furthermore, we studied the H-ARQ systems advocated in the context of cooperation-aided wireless networks, where the MIMO elements are constituted by the individual elements of separate network nodes. Both perfect and imperfect coherent detection as well as non-coherent detection aided cooperative H-ARQ schemes are considered. In the perfect coherent detection based pilot symbol assisted scheme, a novel relay-switching aided H-ARQ scheme is proposed for mitigating the effects of correlation in fading wireless channels, followed by a H-ARQ scheme employing systematic Luby transform codes. In contrast to the unrealistic perfect coherent detection, realistic imperfect coherent schemes are studied, where the channel impulse responses are imperfectly estimated. Furthermore, non-coherent differential detection aided cooperative H-ARQ schemes are proposed and compared to their coherent detection assisted counterparts. Finally, a novel cooperative H-ARQ arrangement based on distributed space-time codes is proposed for the sake of improving the attainable system throughput, while reducing the system’s complexity.

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More information

Published date: January 2012
Organisations: University of Southampton, Southampton Wireless Group

Identifiers

Local EPrints ID: 210915
URI: http://eprints.soton.ac.uk/id/eprint/210915
PURE UUID: 3ba7f4ba-5e6e-4772-84c1-f323580103d2
ORCID for Lajos Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

Catalogue record

Date deposited: 20 Mar 2012 17:02
Last modified: 21 Nov 2021 02:35

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Contributors

Author: Hoang Anh Ngo
Thesis advisor: Lajos Hanzo ORCID iD

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