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Joint synchronization and SNR estimation for turbo codes in AWGN channels | IEEE Journals & Magazine | IEEE Xplore

Joint synchronization and SNR estimation for turbo codes in AWGN channels


Abstract:

Turbo codes are sensitive to both (timing) synchronization errors and signal-to-noise ratio (SNR) mismatch. Since turbo codes are intended to work in environments with ve...Show More

Abstract:

Turbo codes are sensitive to both (timing) synchronization errors and signal-to-noise ratio (SNR) mismatch. Since turbo codes are intended to work in environments with very low SNR, conventional synchronization methods often fail. This paper investigates blind symbol-timing synchronization and SNR estimation based on oversampled data frames. The technique is particularly suitable for low-rate turbo codes operating in additive white Gaussian noise at low SNR and modest data-transfer rates, as in deep space, satellite, fixed wireless, or wireline communications. In accordance with the turbo principle, intermediate decoding results are fed back to the estimator, thereby facilitating decision-directed estimation. The analytical and simulated results show that with three or more samples per symbol and raised cosine-rolloff pulse shaping, performance approaches that of systems with perfect timing and SNR knowledge at the receiver.
Published in: IEEE Transactions on Communications ( Volume: 53, Issue: 7, July 2005)
Page(s): 1136 - 1144
Date of Publication: 31 July 2005

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