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Sensitivity to SNR mismatch in interference cancelling based turbo equalizers | IEEE Conference Publication | IEEE Xplore

Sensitivity to SNR mismatch in interference cancelling based turbo equalizers


Abstract:

We study the sensitivity of a special iterative detection scheme, called turbo-equalizer, to an SNR (signal-to-noise ratio) mismatch at the receiver. For turbo equalizati...Show More

Abstract:

We study the sensitivity of a special iterative detection scheme, called turbo-equalizer, to an SNR (signal-to-noise ratio) mismatch at the receiver. For turbo equalization, the same algorithm as for SISO (soft-input soft-output) decoding is used for equalization at the first iteration. This turbo equalizer uses a MAP (maximum a posteriori) or Viterbi based SISO equalizer at the first iteration, and employs a simple interference canceller in the next iterations. It is shown that the sensitivity to an SNR mismatch is more for larger encoder memory length, as well as for difficult-to-equalize (highly delay-dispersive) channels. For the case that no information is available on SNR, a simple online SNR estimation technique is proposed, which gives satisfying results.
Date of Conference: 18-18 September 2002
Date Added to IEEE Xplore: 10 December 2002
Print ISBN:0-7803-7589-0
Conference Location: Lisbon, Portugal

References

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