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Achieving full diversity in multi-antenna two-way relay networks via symbol-based physical-layer network coding

Achieving full diversity in multi-antenna two-way relay networks via symbol-based physical-layer network coding
Achieving full diversity in multi-antenna two-way relay networks via symbol-based physical-layer network coding
This paper considers physical-layer network coding (PNC) with M-ary phase-shift keying (MPSK) modulation in two-way relay channel (TWRC). A low complexity detection technique, termed symbol-based PNC (SPNC), is proposed for the relay. In particular, attributing to the outer product operation imposed on the superposed MPSK signals at the relay, SPNC obtains the network-coded symbol (NCS) straightforwardly without having to detect individual symbols separately. Unlike the optimal multi-user detector (MUD) which searches over the combinations of all users’ modulation constellations, SPNC searches over only one modulation constellation, thus simplifies the NCS detection. Despite the reduced complexity, SPNC achieves full diversity in multi-antenna relay as the optimal MUD does. Specifically, antenna selection based SPNC (AS-SPNC) scheme and signal combining based SPNC (SC-SPNC) scheme are proposed. Our analysis of these two schemes not only confirms their full diversity performance, but also implies when SPNC is applied in multi-antenna relay, TWRC can be viewed as an effective single-input multiple-output (SIMO) system, in which AS-PNC and SC-PNC are equivalent to the general AS scheme and the maximal-ratio combining (MRC) scheme. Moreover, an asymptotic analysis of symbol error rate (SER) is provided for SC-PNC considering the case that the number of relay antennas is sufficiently large.
physical-layer network coding, pnc, single-input multiple-output, simo, two-way relay, multi-antenna relay, diversity analysis
3445-3457
Cao, Ruohan
5a033409-9b40-44ac-ad1d-b3261983119b
Lv, Tiejun
fb465673-1068-4cae-bb94-93ab1dd63f4d
Gao, Hui
d1b095e6-df29-4eb6-b7fb-efa6baf8e162
Yang, Shaoshi
df1e6c38-ff3b-473e-b36b-4820db908e60
Cioffi, John M.
af35a929-e715-4104-8c38-c5afb9ddb9ab
Cao, Ruohan
5a033409-9b40-44ac-ad1d-b3261983119b
Lv, Tiejun
fb465673-1068-4cae-bb94-93ab1dd63f4d
Gao, Hui
d1b095e6-df29-4eb6-b7fb-efa6baf8e162
Yang, Shaoshi
df1e6c38-ff3b-473e-b36b-4820db908e60
Cioffi, John M.
af35a929-e715-4104-8c38-c5afb9ddb9ab

Cao, Ruohan, Lv, Tiejun, Gao, Hui, Yang, Shaoshi and Cioffi, John M. (2013) Achieving full diversity in multi-antenna two-way relay networks via symbol-based physical-layer network coding. IEEE Transactions on Wireless Communications, 12 (7), 3445-3457. (doi:10.1109/TWC.2013.061413.121223).

Record type: Article

Abstract

This paper considers physical-layer network coding (PNC) with M-ary phase-shift keying (MPSK) modulation in two-way relay channel (TWRC). A low complexity detection technique, termed symbol-based PNC (SPNC), is proposed for the relay. In particular, attributing to the outer product operation imposed on the superposed MPSK signals at the relay, SPNC obtains the network-coded symbol (NCS) straightforwardly without having to detect individual symbols separately. Unlike the optimal multi-user detector (MUD) which searches over the combinations of all users’ modulation constellations, SPNC searches over only one modulation constellation, thus simplifies the NCS detection. Despite the reduced complexity, SPNC achieves full diversity in multi-antenna relay as the optimal MUD does. Specifically, antenna selection based SPNC (AS-SPNC) scheme and signal combining based SPNC (SC-SPNC) scheme are proposed. Our analysis of these two schemes not only confirms their full diversity performance, but also implies when SPNC is applied in multi-antenna relay, TWRC can be viewed as an effective single-input multiple-output (SIMO) system, in which AS-PNC and SC-PNC are equivalent to the general AS scheme and the maximal-ratio combining (MRC) scheme. Moreover, an asymptotic analysis of symbol error rate (SER) is provided for SC-PNC considering the case that the number of relay antennas is sufficiently large.

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More information

Published date: July 2013
Keywords: physical-layer network coding, pnc, single-input multiple-output, simo, two-way relay, multi-antenna relay, diversity analysis
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 344553
URI: https://eprints.soton.ac.uk/id/eprint/344553
PURE UUID: 3703ecd1-bdd2-415d-906a-99aeeb00f029

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Date deposited: 25 Oct 2012 09:18
Last modified: 18 Jul 2017 05:15

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Contributors

Author: Ruohan Cao
Author: Tiejun Lv
Author: Hui Gao
Author: Shaoshi Yang
Author: John M. Cioffi

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