Pre-Filter Based on Allpass Filter for Blind MIMO-OFDM Equalization Using CMA Algorithm

Naoto SASAOKA; James OKELLO; Masatsune ISHIHARA; Kazuki AOYAMA; Yoshio ITOH

doi:10.1587/transcom.2015EBP3517

Pre-Filter Based on Allpass Filter for Blind MIMO-OFDM Equalization Using CMA Algorithm

Naoto SASAOKA, James OKELLO, Masatsune ISHIHARA, Kazuki AOYAMA, Yoshio ITOH

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Summary :

We propose a pre-filtering system for blind equalization in order to separate orthogonal frequency division multiplexing (OFDM) symbols in a multiple-input multiple-output (MIMO) - OFDM system. In a conventional blind MIMO-OFDM equalization without the pre-filtering system, there is a possibility that originally transmitted streams are permutated, resulting in the receiver being unable to retrieve desired signals. We also note that signal permutation is different for each subcarrier. In order to solve this problem, each transmitted stream of the proposed MIMO-OFDM system is pre-filtered by a unique allpass filter. In this paper, the pre-filter is referred to as transmit tagging filter (TT-Filter). At a receiver, an inverse filter of the TT-filter is used to blindly equalize a MIMO channel without permutation problem. Further, in order to overcome the issue of phase ambiguity, this paper introduces blind phase compensation.

Publication: IEICE TRANSACTIONS on Communications Vol.E100-B No.4 pp.602-611

Publication Date: 2017/04/01

Publicized: 2016/10/28

Online ISSN: 1745-1345

DOI: 10.1587/transcom.2015EBP3517

Type of Manuscript: PAPER

Category: Wireless Communication Technologies

Authors

Naoto SASAOKA
  Tottori University
James OKELLO
  University of KwaZulu-Natal
Masatsune ISHIHARA
  Tottori University
Kazuki AOYAMA
  Tottori University
Yoshio ITOH
  Tottori University

Keyword

MIMO-OFDM, blind equalization, permutation, allpass filter

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Naoto SASAOKA, James OKELLO, Masatsune ISHIHARA, Kazuki AOYAMA, Yoshio ITOH, "Pre-Filter Based on Allpass Filter for Blind MIMO-OFDM Equalization Using CMA Algorithm" in IEICE TRANSACTIONS on Communications, vol. E100-B, no. 4, pp. 602-611, April 2017, doi: 10.1587/transcom.2015EBP3517.
Abstract: We propose a pre-filtering system for blind equalization in order to separate orthogonal frequency division multiplexing (OFDM) symbols in a multiple-input multiple-output (MIMO) - OFDM system. In a conventional blind MIMO-OFDM equalization without the pre-filtering system, there is a possibility that originally transmitted streams are permutated, resulting in the receiver being unable to retrieve desired signals. We also note that signal permutation is different for each subcarrier. In order to solve this problem, each transmitted stream of the proposed MIMO-OFDM system is pre-filtered by a unique allpass filter. In this paper, the pre-filter is referred to as transmit tagging filter (TT-Filter). At a receiver, an inverse filter of the TT-filter is used to blindly equalize a MIMO channel without permutation problem. Further, in order to overcome the issue of phase ambiguity, this paper introduces blind phase compensation.
URL: https://globals.ieice.org/en_transactions/communications/10.1587/transcom.2015EBP3517/_p

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@ARTICLE{e100-b_4_602,
author={Naoto SASAOKA, James OKELLO, Masatsune ISHIHARA, Kazuki AOYAMA, Yoshio ITOH, },
journal={IEICE TRANSACTIONS on Communications},
title={Pre-Filter Based on Allpass Filter for Blind MIMO-OFDM Equalization Using CMA Algorithm},
year={2017},
volume={E100-B},
number={4},
pages={602-611},
abstract={We propose a pre-filtering system for blind equalization in order to separate orthogonal frequency division multiplexing (OFDM) symbols in a multiple-input multiple-output (MIMO) - OFDM system. In a conventional blind MIMO-OFDM equalization without the pre-filtering system, there is a possibility that originally transmitted streams are permutated, resulting in the receiver being unable to retrieve desired signals. We also note that signal permutation is different for each subcarrier. In order to solve this problem, each transmitted stream of the proposed MIMO-OFDM system is pre-filtered by a unique allpass filter. In this paper, the pre-filter is referred to as transmit tagging filter (TT-Filter). At a receiver, an inverse filter of the TT-filter is used to blindly equalize a MIMO channel without permutation problem. Further, in order to overcome the issue of phase ambiguity, this paper introduces blind phase compensation.},
keywords={},
doi={10.1587/transcom.2015EBP3517},
ISSN={1745-1345},
month={April},}

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TY - JOUR
TI - Pre-Filter Based on Allpass Filter for Blind MIMO-OFDM Equalization Using CMA Algorithm
T2 - IEICE TRANSACTIONS on Communications
SP - 602
EP - 611
AU - Naoto SASAOKA
AU - James OKELLO
AU - Masatsune ISHIHARA
AU - Kazuki AOYAMA
AU - Yoshio ITOH
PY - 2017
DO - 10.1587/transcom.2015EBP3517
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E100-B
IS - 4
JA - IEICE TRANSACTIONS on Communications
Y1 - April 2017
AB - We propose a pre-filtering system for blind equalization in order to separate orthogonal frequency division multiplexing (OFDM) symbols in a multiple-input multiple-output (MIMO) - OFDM system. In a conventional blind MIMO-OFDM equalization without the pre-filtering system, there is a possibility that originally transmitted streams are permutated, resulting in the receiver being unable to retrieve desired signals. We also note that signal permutation is different for each subcarrier. In order to solve this problem, each transmitted stream of the proposed MIMO-OFDM system is pre-filtered by a unique allpass filter. In this paper, the pre-filter is referred to as transmit tagging filter (TT-Filter). At a receiver, an inverse filter of the TT-filter is used to blindly equalize a MIMO channel without permutation problem. Further, in order to overcome the issue of phase ambiguity, this paper introduces blind phase compensation.
ER -