APPA symbol timing recovery scheme for turbo codes

L Zhang; A Burr

APPA symbol timing recovery scheme for turbo codes

L Zhang, A Burr

Electronic Engineering

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

Abstract

A timing recovery system is proposed based on Maximum Likelihood Estimation, suited to coding systems employing iterative soft-in/soft-out decoding like Turbo Codes, as this method utilises the soft-output from the decoder to assist in the timing estimation. Timing recovery is combined with decoding through an iterative technique in contrast to the traditional approaches where timing recovery is carried out prior to decoding. The timing estimate is one of the zeros on the S-curve (the log-likelihood function derivative) corresponding to the maximum of the loglikelihood function. It is resolved using an interpolation algorithm based merely on four samples and avoids generating the whole S-curve for every block. The synchroniser has effectively no acquisition period. The performance of the estimator is analysed in terms of the mean and the variance of the timing estimate, and it is shown that it provides a significant improvement over the NDA method and approaches the results obtained from the DA method (which ideally assumes the data is known and available all the time) after 5 iterations.

Original language	English
Title of host publication	13TH IEEE INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS, VOL 1-5, PROCEEDINGS
Place of Publication	NEW YORK
Publisher	IEEE
Pages	44-48
Number of pages	5
ISBN (Print)	0-7803-7589-0
Publication status	Published - 2002
Event	13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications - LISBON Duration: 15 Sept 2002 → 18 Sept 2002

Conference

Conference	13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications
City	LISBON
Period	15/09/02 → 18/09/02

Cite this

@inproceedings{e587bff66e384c899958bacbb46f7214,

title = "APPA symbol timing recovery scheme for turbo codes",

abstract = "A timing recovery system is proposed based on Maximum Likelihood Estimation, suited to coding systems employing iterative soft-in/soft-out decoding like Turbo Codes, as this method utilises the soft-output from the decoder to assist in the timing estimation. Timing recovery is combined with decoding through an iterative technique in contrast to the traditional approaches where timing recovery is carried out prior to decoding. The timing estimate is one of the zeros on the S-curve (the log-likelihood function derivative) corresponding to the maximum of the loglikelihood function. It is resolved using an interpolation algorithm based merely on four samples and avoids generating the whole S-curve for every block. The synchroniser has effectively no acquisition period. The performance of the estimator is analysed in terms of the mean and the variance of the timing estimate, and it is shown that it provides a significant improvement over the NDA method and approaches the results obtained from the DA method (which ideally assumes the data is known and available all the time) after 5 iterations.",

author = "L Zhang and A Burr",

year = "2002",

language = "English",

isbn = "0-7803-7589-0",

pages = "44--48",

booktitle = "13TH IEEE INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS, VOL 1-5, PROCEEDINGS",

publisher = "IEEE",

address = "United States",

note = "13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications ; Conference date: 15-09-2002 Through 18-09-2002",

}

TY - GEN

T1 - APPA symbol timing recovery scheme for turbo codes

AU - Zhang, L

AU - Burr, A

PY - 2002

Y1 - 2002

N2 - A timing recovery system is proposed based on Maximum Likelihood Estimation, suited to coding systems employing iterative soft-in/soft-out decoding like Turbo Codes, as this method utilises the soft-output from the decoder to assist in the timing estimation. Timing recovery is combined with decoding through an iterative technique in contrast to the traditional approaches where timing recovery is carried out prior to decoding. The timing estimate is one of the zeros on the S-curve (the log-likelihood function derivative) corresponding to the maximum of the loglikelihood function. It is resolved using an interpolation algorithm based merely on four samples and avoids generating the whole S-curve for every block. The synchroniser has effectively no acquisition period. The performance of the estimator is analysed in terms of the mean and the variance of the timing estimate, and it is shown that it provides a significant improvement over the NDA method and approaches the results obtained from the DA method (which ideally assumes the data is known and available all the time) after 5 iterations.

AB - A timing recovery system is proposed based on Maximum Likelihood Estimation, suited to coding systems employing iterative soft-in/soft-out decoding like Turbo Codes, as this method utilises the soft-output from the decoder to assist in the timing estimation. Timing recovery is combined with decoding through an iterative technique in contrast to the traditional approaches where timing recovery is carried out prior to decoding. The timing estimate is one of the zeros on the S-curve (the log-likelihood function derivative) corresponding to the maximum of the loglikelihood function. It is resolved using an interpolation algorithm based merely on four samples and avoids generating the whole S-curve for every block. The synchroniser has effectively no acquisition period. The performance of the estimator is analysed in terms of the mean and the variance of the timing estimate, and it is shown that it provides a significant improvement over the NDA method and approaches the results obtained from the DA method (which ideally assumes the data is known and available all the time) after 5 iterations.

M3 - Conference contribution

SN - 0-7803-7589-0

SP - 44

EP - 48

BT - 13TH IEEE INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS, VOL 1-5, PROCEEDINGS

PB - IEEE

CY - NEW YORK

T2 - 13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

Y2 - 15 September 2002 through 18 September 2002

ER -