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Subspace-Based Blind Channel Identification for Cyclic Prefix Systems Using Few Received Blocks

Su, Borching and Vaidyanathan, P. P. (2007) Subspace-Based Blind Channel Identification for Cyclic Prefix Systems Using Few Received Blocks. IEEE Transactions on Signal Processing, 55 (10). pp. 4979-4993. ISSN 1053-587X. https://resolver.caltech.edu/CaltechAUTHORS:SUBieeetsp07b

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Abstract

In this paper, a novel generalization of subspace-based blind channel identification methods in cyclic prefix (CP) systems is proposed. For the generalization, a new system parameter called repetition index is introduced whose value is unity for previously reported special cases. By choosing a repetition index larger than unity, the number of received blocks needed for blind identification is significantly reduced compared to all previously reported methods. This feature makes the method more realistic especially in wireless environments where the channel state is usually fast-varying. Given the number of received blocks available, the minimum value of repetition index is derived. Theoretical limit allows the proposed method to perform blind identification using only three received blocks in absence of noise. In practice, the number of received blocks needed to yield a satisfactory bit-error-rate (BER) performance is usually on the order of half the block size. Simulation results not only demonstrate the capability of the algorithm to perform blind identification using fewer received blocks, but also show that in some cases system performance can be improved by choosing a repetition index larger than needed. Simulation of the proposed method over time-varying channels clearly demonstrates the improvement over previously reported methods.


Item Type:Article
Additional Information:© Copyright 2007 IEEE. Reprinted with permission. Manuscript received August 10, 2006; revised January 4, 2007. [Posted online: 2007-09-24] The associate editor coordinating the review of this manuscript and approving it for publication was Dr. Petr Tichavsky. This work was supported in part by the NSF by Grant CCF-0428326, by the ONR by Grant N00014-06-1-0011, and by the Moore Fellowship of the California Institute of Technology.
Subject Keywords:Blind identification, cyclic prefix, orthogonal frequency division multiplexing (OFDM), repetition index, single-carrier cyclic prefix (SC-CP), subspace-based methods
Issue or Number:10
Record Number:CaltechAUTHORS:SUBieeetsp07b
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:SUBieeetsp07b
Alternative URL:http://dx.doi.org/10.1109/TSP.2007.896262
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9085
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:26 Oct 2007
Last Modified:02 Oct 2019 23:57

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