Channel estimation techniques based on pilot arrangement in OFDM systems

Sinem Coleri; Mustafa Ergen; Anuj Puri; Ahmad Bahai

doi:10.1109/TBC.2002.804034

Channel estimation techniques based on pilot arrangement in OFDM systems

Sinem Coleri^*, Mustafa Ergen, Anuj Puri, Ahmad Bahai

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

1319 Citations (Scopus)

Abstract

The channel estimation techniques for OFDM systems based on pilot arrangement are investigated. The channel estimation based on comb type pilot arrangement is studied through different algorithms for both estimating channel at pilot frequencies and interpolating the channel. The estimation of channel at pilot frequencies is based on LS and LMS while the channel interpolation is done using linear interpolation, second order interpolation, low-pass interpolation, spline cubic interpolation, and time domain interpolation. Time-domain interpolation is obtained by passing to time domain through IDFT (Inverse Discrete Fourier Transform), zero padding and going back to frequency domain through DFT (Discrete Fourier Transform). In addition, the channel estimation based on block type pilot arrangement is performed by sending pilots at every sub-channel and using this estimation for a specific number of following symbols. We have also implemented decision feedback equalizer for all sub-channels followed by periodic block-type pilots. We have compared the performances of all schemes by measuring bit error rate with 16QAM, QPSK, DQPSK and BPSK as modulation schemes, and multi-path Rayleigh fading and AR based fading channels as channel models.

Original language	English
Pages (from-to)	223-229
Number of pages	7
Journal	IEEE Transactions on Broadcasting
Volume	48
Issue number	3
DOIs	https://doi.org/10.1109/TBC.2002.804034
Publication status	Published - Sept 2002
Externally published	Yes

Funding

Manuscript received February 19, 2002; revised June 12, 2002. This work was supported by the Office of Naval Research and National Semiconductor. S. Coleri, M. Ergen, and A. Puri are with Electrical Engineering, UC Berkeley, Berkeley, CA, USA (e-mail: {csinem; ergen; anuj}@ eecs.berkeley.edu). A. Bahai is with Electrical Engineering, Stanford University, Stanford, CA, USA (e-mail: [email protected]). Publisher Item Identifier 10.1109/TBC.2002.804034.

Funders	Funder number
Office of Naval Research

Keywords

Cochannel interference
Communication channels
Data communication
Digital communication
Frequency division multiplexing
Frequency domain analysis
Time domain analysis
Time-varying channels

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10.1109/TBC.2002.804034

Cite this

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title = "Channel estimation techniques based on pilot arrangement in OFDM systems",

abstract = "The channel estimation techniques for OFDM systems based on pilot arrangement are investigated. The channel estimation based on comb type pilot arrangement is studied through different algorithms for both estimating channel at pilot frequencies and interpolating the channel. The estimation of channel at pilot frequencies is based on LS and LMS while the channel interpolation is done using linear interpolation, second order interpolation, low-pass interpolation, spline cubic interpolation, and time domain interpolation. Time-domain interpolation is obtained by passing to time domain through IDFT (Inverse Discrete Fourier Transform), zero padding and going back to frequency domain through DFT (Discrete Fourier Transform). In addition, the channel estimation based on block type pilot arrangement is performed by sending pilots at every sub-channel and using this estimation for a specific number of following symbols. We have also implemented decision feedback equalizer for all sub-channels followed by periodic block-type pilots. We have compared the performances of all schemes by measuring bit error rate with 16QAM, QPSK, DQPSK and BPSK as modulation schemes, and multi-path Rayleigh fading and AR based fading channels as channel models.",

keywords = "Cochannel interference, Communication channels, Data communication, Digital communication, Frequency division multiplexing, Frequency domain analysis, Time domain analysis, Time-varying channels",

author = "Sinem Coleri and Mustafa Ergen and Anuj Puri and Ahmad Bahai",

year = "2002",

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AU - Coleri, Sinem

AU - Ergen, Mustafa

AU - Puri, Anuj

AU - Bahai, Ahmad

PY - 2002/9

Y1 - 2002/9

N2 - The channel estimation techniques for OFDM systems based on pilot arrangement are investigated. The channel estimation based on comb type pilot arrangement is studied through different algorithms for both estimating channel at pilot frequencies and interpolating the channel. The estimation of channel at pilot frequencies is based on LS and LMS while the channel interpolation is done using linear interpolation, second order interpolation, low-pass interpolation, spline cubic interpolation, and time domain interpolation. Time-domain interpolation is obtained by passing to time domain through IDFT (Inverse Discrete Fourier Transform), zero padding and going back to frequency domain through DFT (Discrete Fourier Transform). In addition, the channel estimation based on block type pilot arrangement is performed by sending pilots at every sub-channel and using this estimation for a specific number of following symbols. We have also implemented decision feedback equalizer for all sub-channels followed by periodic block-type pilots. We have compared the performances of all schemes by measuring bit error rate with 16QAM, QPSK, DQPSK and BPSK as modulation schemes, and multi-path Rayleigh fading and AR based fading channels as channel models.

AB - The channel estimation techniques for OFDM systems based on pilot arrangement are investigated. The channel estimation based on comb type pilot arrangement is studied through different algorithms for both estimating channel at pilot frequencies and interpolating the channel. The estimation of channel at pilot frequencies is based on LS and LMS while the channel interpolation is done using linear interpolation, second order interpolation, low-pass interpolation, spline cubic interpolation, and time domain interpolation. Time-domain interpolation is obtained by passing to time domain through IDFT (Inverse Discrete Fourier Transform), zero padding and going back to frequency domain through DFT (Discrete Fourier Transform). In addition, the channel estimation based on block type pilot arrangement is performed by sending pilots at every sub-channel and using this estimation for a specific number of following symbols. We have also implemented decision feedback equalizer for all sub-channels followed by periodic block-type pilots. We have compared the performances of all schemes by measuring bit error rate with 16QAM, QPSK, DQPSK and BPSK as modulation schemes, and multi-path Rayleigh fading and AR based fading channels as channel models.

KW - Cochannel interference

KW - Communication channels

KW - Data communication

KW - Digital communication

KW - Frequency division multiplexing

KW - Frequency domain analysis

KW - Time domain analysis

KW - Time-varying channels

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JO - IEEE Transactions on Broadcasting

JF - IEEE Transactions on Broadcasting

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ER -

Channel estimation techniques based on pilot arrangement in OFDM systems

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