Low-complexity channel estimation for OFDM systems in high-mobility fading channels

Mahmut YALÇIN; Aydın AKAN; Hakan DOĞAN

Article Details

Low-complexity channel estimation for OFDM systems in high-mobility fading channels

Authors:

Mahmut YALÇIN | Aydın AKAN | Hakan DOĞAN

Publisher:

TUBITAK

Journal:

Turkish Journal of Electrical Engineering and Computer Science 2012 Vol.20 Issue 4, pp.583-592

Document Type:

Article

Publication Date:

3/2012

Document Language:

Turkish

Document ID (Org No.):

2000743571

Frequency:

Bimonthly

eISSN:

1303-6203

pISSN:

1300-0632

Abstract:

 

Nowadays, multicarrier transmission is very popular because  of the high data rate requirement of wireless systems.  Orthogonal  frequency-division multiplexing (OFDM) is a special case of  multicarrier transmission.  It is considered an effective technique  for frequency-selective channels because of its spectral efficiency,  its robustness in different multipath propagation environments, and  its ability of combating intersymbol interference.  Losing subchannel  orthogonality causes interchannel interference, but many conventional  channel estimators assume that the channel is time-invariant during  one OFDM symbol.  This assumption causes error floors along the OFDM  symbol for high-mobility cases.  In this paper, we propose  2-dimensional pilot symbol-assisted channel estimation for wireless  OFDM systems by using frequency and time-domain interpolation.  This  method has the advantage of minimizing the system complexity and  processing delay while closely approximating the actual mobile  channel.  The performance of our proposed method is compared to  coherent modulation with perfect channel estimation as well as other  conventional channel estimation methods.  Different detection  techniques were used to test our proposed channel estimation  algorithm.

 

Nowadays, multicarrier transmission is very popular because  of the high data rate requirement of wireless systems.  Orthogonal  frequency-division multiplexing (OFDM) is a special case of  multicarrier transmission.  It is considered an effective technique  for frequency-selective channels because of its spectral efficiency,  its robustness in different multipath propagation environments, and  its ability of combating intersymbol interference.  Losing subchannel  orthogonality causes interchannel interference, but many conventional  channel estimators assume that the channel is time-invariant during  one OFDM symbol.  This assumption causes error floors along the OFDM  symbol for high-mobility cases.  In this paper, we propose  2-dimensional pilot symbol-assisted channel estimation for wireless  OFDM systems by using frequency and time-domain interpolation.  This  method has the advantage of minimizing the system complexity and  processing delay while closely approximating the actual mobile  channel.  The performance of our proposed method is compared to  coherent modulation with perfect channel estimation as well as other  conventional channel estimation methods.  Different detection  techniques were used to test our proposed channel estimation  algorithm.

Article Details

Low-complexity channel estimation for OFDM systems in high-mobility fading channels

Authors: Mahmut YALÇIN | Aydın AKAN | Hakan DOĞAN

Publisher: TUBITAK

Journal: Turkish Journal of Electrical Engineering and Computer Science 2012 Vol.20 Issue 4, pp.583-592

Document Type: Article

Publication Date: 3/2012

Document Language: Turkish

Document ID (Org No.): 2000743571

Frequency: Bimonthly

eISSN: 1303-6203

pISSN: 1300-0632

Issues

Authors:

Mahmut YALÇIN | Aydın AKAN | Hakan DOĞAN

Publisher:

TUBITAK

Journal:

Turkish Journal of Electrical Engineering and Computer Science 2012 Vol.20 Issue 4, pp.583-592

Document Type:

Article

Publication Date:

3/2012

Document Language:

Turkish

Document ID (Org No.):

2000743571

Frequency:

Bimonthly

eISSN:

1303-6203

pISSN:

1300-0632