title   
  

Semi-blind sparse channel estimation with constant modulus symbols

Çetin, Müjdat and Sadler, Brian M. (2005) Semi-blind sparse channel estimation with constant modulus symbols. In: IEEE International Conference on Acoustics, Speech, and Signal Processing, Philadelphia, PA, USA

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Official URL: http://dx.doi.org/10.1109/ICASSP.2005.1415771

Abstract

We propose two methods for the estimation of sparse communication channels. In the first method, we consider the problem of channel estimation based on training symbols, and formulate it as an optimization problem. In this formulation, we combine the objective of fidelity to the received data with a non-quadratic constraint reflecting the prior information about the sparsity of the channel. This approach leads to accurate channel estimates with much shorter training sequences than conventional methods. The second method we propose is aimed at taking advantage of any available training-based data, as well as any "blind" data based on unknown, constant modulus symbols. We propose a semi-blind optimization framework making use of these two types of data, and enforcing the sparsity of the channel, as well as the constant modulus property of the symbols. This approach improves upon the channel estimates based only on training sequences, and also produces accurate estimates for the unknown symbols.

Item Type:Papers in Conference Proceedings
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
ID Code:1345
Deposited By:Müjdat Çetin
Deposited On:27 Dec 2005 02:00
Last Modified:12 Nov 2007 22:07

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