Iterative detection for OFDMA uplink with frequency offsets

S. Ahmed; Li Zhang

doi:10.1109/WCNC.2009.4917764

Iterative detection for OFDMA uplink with frequency offsets

S. Ahmed^*, Li Zhang

^*Corresponding author for this work

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

Abstract

In this work, we propose an iterative algorithm for the detection of transmitted symbols at the uplink of an orthogonal frequency-division multiple access (OFDMA) system. The algorithm allows distinct frequency-offsets (FO)s from each user that cause self- and multiple-access-interference. The proposed algorithm squeezes the interference of subcarrier k into 2D +1 nearby subcarriers by preprocessing the received signal, which yields a banded structure interference matrix. This banded structure is exploited to realize a low complexity iterative softinterference- cancellation minimum mean-squared error (SICMMSE) equalizer that can be used in Turbo equalization. Simulation results show that the bit-error-rate (BER) performance of the proposed algorithm outperforms existing detection algorithms and is very much close to the zero-FO frequencydomain-equalization (zero-FO-FDE) at low computational cost.

Original language	English (US)
Title of host publication	2009 IEEE Wireless Communications and Networking Conference, WCNC 2009 - Proceedings
DOIs	https://doi.org/10.1109/WCNC.2009.4917764
State	Published - 2009
Externally published	Yes
Event	2009 IEEE Wireless Communications and Networking Conference, WCNC 2009 - Budapest, Hungary Duration: Apr 5 2009 → Apr 8 2009

Other

Other	2009 IEEE Wireless Communications and Networking Conference, WCNC 2009
Country/Territory	Hungary
City	Budapest
Period	04/5/09 → 04/8/09

Keywords

Iterative MMSE equalizer
OFDMA

ASJC Scopus subject areas

Engineering(all)

Access to Document

10.1109/WCNC.2009.4917764

Cite this

@inproceedings{d1051f1a51de4d96bee483808031fad0,

title = "Iterative detection for OFDMA uplink with frequency offsets",

abstract = "In this work, we propose an iterative algorithm for the detection of transmitted symbols at the uplink of an orthogonal frequency-division multiple access (OFDMA) system. The algorithm allows distinct frequency-offsets (FO)s from each user that cause self- and multiple-access-interference. The proposed algorithm squeezes the interference of subcarrier k into 2D +1 nearby subcarriers by preprocessing the received signal, which yields a banded structure interference matrix. This banded structure is exploited to realize a low complexity iterative softinterference- cancellation minimum mean-squared error (SICMMSE) equalizer that can be used in Turbo equalization. Simulation results show that the bit-error-rate (BER) performance of the proposed algorithm outperforms existing detection algorithms and is very much close to the zero-FO frequencydomain-equalization (zero-FO-FDE) at low computational cost.",

keywords = "Iterative MMSE equalizer, OFDMA",

author = "S. Ahmed and Li Zhang",

year = "2009",

doi = "10.1109/WCNC.2009.4917764",

language = "English (US)",

isbn = "9781424429486",

booktitle = "2009 IEEE Wireless Communications and Networking Conference, WCNC 2009 - Proceedings",

note = "2009 IEEE Wireless Communications and Networking Conference, WCNC 2009 ; Conference date: 05-04-2009 Through 08-04-2009",

}

TY - GEN

T1 - Iterative detection for OFDMA uplink with frequency offsets

AU - Ahmed, S.

AU - Zhang, Li

PY - 2009

Y1 - 2009

N2 - In this work, we propose an iterative algorithm for the detection of transmitted symbols at the uplink of an orthogonal frequency-division multiple access (OFDMA) system. The algorithm allows distinct frequency-offsets (FO)s from each user that cause self- and multiple-access-interference. The proposed algorithm squeezes the interference of subcarrier k into 2D +1 nearby subcarriers by preprocessing the received signal, which yields a banded structure interference matrix. This banded structure is exploited to realize a low complexity iterative softinterference- cancellation minimum mean-squared error (SICMMSE) equalizer that can be used in Turbo equalization. Simulation results show that the bit-error-rate (BER) performance of the proposed algorithm outperforms existing detection algorithms and is very much close to the zero-FO frequencydomain-equalization (zero-FO-FDE) at low computational cost.

AB - In this work, we propose an iterative algorithm for the detection of transmitted symbols at the uplink of an orthogonal frequency-division multiple access (OFDMA) system. The algorithm allows distinct frequency-offsets (FO)s from each user that cause self- and multiple-access-interference. The proposed algorithm squeezes the interference of subcarrier k into 2D +1 nearby subcarriers by preprocessing the received signal, which yields a banded structure interference matrix. This banded structure is exploited to realize a low complexity iterative softinterference- cancellation minimum mean-squared error (SICMMSE) equalizer that can be used in Turbo equalization. Simulation results show that the bit-error-rate (BER) performance of the proposed algorithm outperforms existing detection algorithms and is very much close to the zero-FO frequencydomain-equalization (zero-FO-FDE) at low computational cost.

KW - Iterative MMSE equalizer

KW - OFDMA

UR - http://www.scopus.com/inward/record.url?scp=70349170512&partnerID=8YFLogxK

U2 - 10.1109/WCNC.2009.4917764

DO - 10.1109/WCNC.2009.4917764

M3 - Conference contribution

AN - SCOPUS:70349170512

SN - 9781424429486

BT - 2009 IEEE Wireless Communications and Networking Conference, WCNC 2009 - Proceedings

T2 - 2009 IEEE Wireless Communications and Networking Conference, WCNC 2009

Y2 - 5 April 2009 through 8 April 2009

ER -

Iterative detection for OFDMA uplink with frequency offsets

Abstract

Other

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this