Channel Estimation Considerations for Iterative Decoding in Wireless Communications | IEEE Conference Publication | IEEE Xplore

Channel Estimation Considerations for Iterative Decoding in Wireless Communications


Abstract:

The time-varying nature of wireless channels poses a challenge for using soft-decision iterative decoders on such channels. Even if the channel gain is perfectly known to...Show More

Abstract:

The time-varying nature of wireless channels poses a challenge for using soft-decision iterative decoders on such channels. Even if the channel gain is perfectly known to the receiver, inaccurate estimation of the additive noise power, results in incorrect log-likelihood computation at the receiver and hence significant performance degradation in the decoder. Through a detailed study of the effects of channel estimation errors on the performance of soft-decision iterative decoders in uncorrelated block-fading channels, we propose a solution which does not need a knowledge of the power of the additive noise. We show that this solution performs almost identical to the case for which a perfect knowledge of the power of the additive noise exists at the receiver. The choice of the block-fading channel reflects a situation where the equivalent variance of the additive Gaussian noise can change in a wide range and thus the decoder performance seriously relies on the knowledge of the noise power at the receiver.
Date of Conference: 24-28 June 2007
Date Added to IEEE Xplore: 13 August 2007
Print ISBN:1-4244-0353-7

ISSN Information:

Conference Location: Glasgow, UK

I. Introduction

In the past few years, motivated by the exemplary performance of graphical codes, such as turbo-codes [1] and low-density parity-check (LDPC) codes [2], a great deal of research has been put into analysis and design of iterative decoders. By now, graphical codes are proposed for many channel models including wireless channels [3]–[5].

References

References is not available for this document.