Transparent inband feedback for training-based mimo systems

Oussama Souihli, Tomoaki Ohtsuki

Research output: Contribution to journalArticle

Abstract

Recently, Echo-MIMO, a delay-free feedback scheme has been proposed for Closed-Loop MIMO systems, where the receiver echoes the received signal on the fly to the transmitter without any processing. While this reduced feedback latency allows for more use of the channel's coherence time for data transmission, it comes at high power-and-bandwidth costs, as twoMIMO transmissions are required in the feedback phase. In this paper, we present a feedback scheme that preserves the advantages of Echo-MIMO while requiring only one feedback transmission. The echoed signals are judiciously combined with the receiver's signals such that their separation at the transmitter be lossless, and that no extra transmit power nor bandwidth be required. In addition, we highlight the estimation accuracy degradation in Echo-MIMO owing to the echoed noise, and analytically confirm the intuition that removing the noise prior to echoing the received signal provides better estimation than echoing the noisy received signal as is and later account for the noise effect upon echo reception. Simulation results show that the proposed scheme outperforms Echo-MIMO in terms of channel estimation accuracy and achievable capacity.

Original languageEnglish
Pages (from-to)587-599
Number of pages13
JournalWireless Personal Communications
Volume63
Issue number3
DOIs
Publication statusPublished - 2012

Fingerprint

MIMO systems
Feedback
Transmitters
Signal receivers
Bandwidth
Channel estimation
Data communication systems
Degradation
Processing
Costs

Keywords

  • Channel estimation
  • Channel feedback
  • Closed-Loop MIMO
  • Rayleigh fading

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Science Applications

Cite this

Transparent inband feedback for training-based mimo systems. / Souihli, Oussama; Ohtsuki, Tomoaki.

In: Wireless Personal Communications, Vol. 63, No. 3, 2012, p. 587-599.

Research output: Contribution to journalArticle

@article{adc157d2bb0a43e79c4159d0d703f223,
title = "Transparent inband feedback for training-based mimo systems",
abstract = "Recently, Echo-MIMO, a delay-free feedback scheme has been proposed for Closed-Loop MIMO systems, where the receiver echoes the received signal on the fly to the transmitter without any processing. While this reduced feedback latency allows for more use of the channel's coherence time for data transmission, it comes at high power-and-bandwidth costs, as twoMIMO transmissions are required in the feedback phase. In this paper, we present a feedback scheme that preserves the advantages of Echo-MIMO while requiring only one feedback transmission. The echoed signals are judiciously combined with the receiver's signals such that their separation at the transmitter be lossless, and that no extra transmit power nor bandwidth be required. In addition, we highlight the estimation accuracy degradation in Echo-MIMO owing to the echoed noise, and analytically confirm the intuition that removing the noise prior to echoing the received signal provides better estimation than echoing the noisy received signal as is and later account for the noise effect upon echo reception. Simulation results show that the proposed scheme outperforms Echo-MIMO in terms of channel estimation accuracy and achievable capacity.",
keywords = "Channel estimation, Channel feedback, Closed-Loop MIMO, Rayleigh fading",
author = "Oussama Souihli and Tomoaki Ohtsuki",
year = "2012",
doi = "10.1007/s11277-010-0152-z",
language = "English",
volume = "63",
pages = "587--599",
journal = "Wireless Personal Communications",
issn = "0929-6212",
publisher = "Springer Netherlands",
number = "3",

}

TY - JOUR

T1 - Transparent inband feedback for training-based mimo systems

AU - Souihli, Oussama

AU - Ohtsuki, Tomoaki

PY - 2012

Y1 - 2012

N2 - Recently, Echo-MIMO, a delay-free feedback scheme has been proposed for Closed-Loop MIMO systems, where the receiver echoes the received signal on the fly to the transmitter without any processing. While this reduced feedback latency allows for more use of the channel's coherence time for data transmission, it comes at high power-and-bandwidth costs, as twoMIMO transmissions are required in the feedback phase. In this paper, we present a feedback scheme that preserves the advantages of Echo-MIMO while requiring only one feedback transmission. The echoed signals are judiciously combined with the receiver's signals such that their separation at the transmitter be lossless, and that no extra transmit power nor bandwidth be required. In addition, we highlight the estimation accuracy degradation in Echo-MIMO owing to the echoed noise, and analytically confirm the intuition that removing the noise prior to echoing the received signal provides better estimation than echoing the noisy received signal as is and later account for the noise effect upon echo reception. Simulation results show that the proposed scheme outperforms Echo-MIMO in terms of channel estimation accuracy and achievable capacity.

AB - Recently, Echo-MIMO, a delay-free feedback scheme has been proposed for Closed-Loop MIMO systems, where the receiver echoes the received signal on the fly to the transmitter without any processing. While this reduced feedback latency allows for more use of the channel's coherence time for data transmission, it comes at high power-and-bandwidth costs, as twoMIMO transmissions are required in the feedback phase. In this paper, we present a feedback scheme that preserves the advantages of Echo-MIMO while requiring only one feedback transmission. The echoed signals are judiciously combined with the receiver's signals such that their separation at the transmitter be lossless, and that no extra transmit power nor bandwidth be required. In addition, we highlight the estimation accuracy degradation in Echo-MIMO owing to the echoed noise, and analytically confirm the intuition that removing the noise prior to echoing the received signal provides better estimation than echoing the noisy received signal as is and later account for the noise effect upon echo reception. Simulation results show that the proposed scheme outperforms Echo-MIMO in terms of channel estimation accuracy and achievable capacity.

KW - Channel estimation

KW - Channel feedback

KW - Closed-Loop MIMO

KW - Rayleigh fading

UR - http://www.scopus.com/inward/record.url?scp=84897573687&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84897573687&partnerID=8YFLogxK

U2 - 10.1007/s11277-010-0152-z

DO - 10.1007/s11277-010-0152-z

M3 - Article

AN - SCOPUS:84897573687

VL - 63

SP - 587

EP - 599

JO - Wireless Personal Communications

JF - Wireless Personal Communications

SN - 0929-6212

IS - 3

ER -