Interference supression for quasi-orthogonal space-frequency MIMO OFDM systems

L Y Song; A G Burr

Interference supression for quasi-orthogonal space-frequency MIMO OFDM systems

Electronic Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

In this paper, we use quasi-orthogonal STBC (QO-STBC) instead of the conventional O-STBC as the inner code for OFDM MIMO systems, resulting in a quasi-orthogonal space-frequency STBC (QO-SFBC). Due to the effects of multi-path, the conventional pair-wise signal detector will introduce severe interference and hence cause an irreducible error floor in the high signal-to-noise ratio (SNR) region for the new QO-SF-OFDM systems. This paper addresses this issue by employing iterative interference cancellation to reduce the error floor. While the computational complexity of the IC detector is a little higher than that of the conventional pair-wise detector, the new IC detector provides much better performance by subtracting the interference resulting from variations between the adjacent OFDM sub-carriers (SCs).

Original language	English
Title of host publication	VTC2005-FALL: 2005 IEEE 62ND VEHICULAR TECHNOLOGY CONFERENCE, 1-4, PROCEEDINGS
Place of Publication	NEW YORK
Publisher	IEEE
Pages	1460-1464
Number of pages	5
ISBN (Print)	0-7803-9152-7
Publication status	Published - 2005
Event	62nd IEEE Vehicular Technology Conference - Dallas Duration: 25 Sept 2005 → 28 Sept 2005

Conference

Conference	62nd IEEE Vehicular Technology Conference
City	Dallas
Period	25/09/05 → 28/09/05

Keywords

quasi-orthogonal space-time block codes
OFDM
space-frequency codes
diversity
WIRELESS COMMUNICATIONS

Cite this

@inproceedings{2a40c250c6ba40a7a86557345bb59048,

title = "Interference supression for quasi-orthogonal space-frequency MIMO OFDM systems",

abstract = "In this paper, we use quasi-orthogonal STBC (QO-STBC) instead of the conventional O-STBC as the inner code for OFDM MIMO systems, resulting in a quasi-orthogonal space-frequency STBC (QO-SFBC). Due to the effects of multi-path, the conventional pair-wise signal detector will introduce severe interference and hence cause an irreducible error floor in the high signal-to-noise ratio (SNR) region for the new QO-SF-OFDM systems. This paper addresses this issue by employing iterative interference cancellation to reduce the error floor. While the computational complexity of the IC detector is a little higher than that of the conventional pair-wise detector, the new IC detector provides much better performance by subtracting the interference resulting from variations between the adjacent OFDM sub-carriers (SCs).",

keywords = "quasi-orthogonal space-time block codes, OFDM, space-frequency codes, diversity, WIRELESS COMMUNICATIONS",

author = "Song, {L Y} and Burr, {A G}",

year = "2005",

language = "English",

isbn = "0-7803-9152-7",

pages = "1460--1464",

booktitle = "VTC2005-FALL: 2005 IEEE 62ND VEHICULAR TECHNOLOGY CONFERENCE, 1-4, PROCEEDINGS",

publisher = "IEEE",

address = "United States",

note = "62nd IEEE Vehicular Technology Conference ; Conference date: 25-09-2005 Through 28-09-2005",

}

TY - GEN

T1 - Interference supression for quasi-orthogonal space-frequency MIMO OFDM systems

AU - Song, L Y

AU - Burr, A G

PY - 2005

Y1 - 2005

N2 - In this paper, we use quasi-orthogonal STBC (QO-STBC) instead of the conventional O-STBC as the inner code for OFDM MIMO systems, resulting in a quasi-orthogonal space-frequency STBC (QO-SFBC). Due to the effects of multi-path, the conventional pair-wise signal detector will introduce severe interference and hence cause an irreducible error floor in the high signal-to-noise ratio (SNR) region for the new QO-SF-OFDM systems. This paper addresses this issue by employing iterative interference cancellation to reduce the error floor. While the computational complexity of the IC detector is a little higher than that of the conventional pair-wise detector, the new IC detector provides much better performance by subtracting the interference resulting from variations between the adjacent OFDM sub-carriers (SCs).

AB - In this paper, we use quasi-orthogonal STBC (QO-STBC) instead of the conventional O-STBC as the inner code for OFDM MIMO systems, resulting in a quasi-orthogonal space-frequency STBC (QO-SFBC). Due to the effects of multi-path, the conventional pair-wise signal detector will introduce severe interference and hence cause an irreducible error floor in the high signal-to-noise ratio (SNR) region for the new QO-SF-OFDM systems. This paper addresses this issue by employing iterative interference cancellation to reduce the error floor. While the computational complexity of the IC detector is a little higher than that of the conventional pair-wise detector, the new IC detector provides much better performance by subtracting the interference resulting from variations between the adjacent OFDM sub-carriers (SCs).

KW - quasi-orthogonal space-time block codes

KW - OFDM

KW - space-frequency codes

KW - diversity

KW - WIRELESS COMMUNICATIONS

M3 - Conference contribution

SN - 0-7803-9152-7

SP - 1460

EP - 1464

BT - VTC2005-FALL: 2005 IEEE 62ND VEHICULAR TECHNOLOGY CONFERENCE, 1-4, PROCEEDINGS

PB - IEEE

CY - NEW YORK

T2 - 62nd IEEE Vehicular Technology Conference

Y2 - 25 September 2005 through 28 September 2005

ER -