Performance analysis of a subspace algorithm for cochannel TDMA signals

Rajiv Chandrasekaran; Kuei-Chiang Lai; John J. Shynk

Performance analysis of a subspace algorithm for cochannel TDMA signals

Rajiv Chandrasekaran, Kuei-Chiang Lai, John J. Shynk

Department of Electrical Engineering

Research output: Contribution to journal › Conference article

Abstract

In this paper, we analyze the performance of a subspace algorithm that separates cochannel TDMA signals using an adaptive antenna array. The algorithm processes a block of data in two passes. In the first pass, the weight vector is constrained to lie in a subspace that contains the direction vector of the signal of interest and is orthogonal to the subspace spanned by the direction vectors of the interferers. In the second pass, this weight vector is modified by projecting it onto an appropriate subspace determined by the cochannel interferers. The analysis includes expressions for the beamformer weights and the mean-square error in terms of the signal direction vectors. These results allow one to numerically evaluate the performance of the subspace algorithm for different cochannel scenarios.

Original language	English
Pages (from-to)	1494-1499
Number of pages	6
Journal	Conference Record of the Asilomar Conference on Signals, Systems and Computers
Volume	2
Publication status	Published - 1998 Dec 1
Event	Proceedings of the 1998 32nd Asilomar Conference on Signals, Systems & Computers. Part 1 (of 2) - Pacific Grove, CA, USA Duration: 1998 Nov 1 → 1998 Nov 4

All Science Journal Classification (ASJC) codes

Signal Processing
Computer Networks and Communications

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Chandrasekaran, R., Lai, K-C., & Shynk, J. J. (1998). Performance analysis of a subspace algorithm for cochannel TDMA signals. Conference Record of the Asilomar Conference on Signals, Systems and Computers, 2, 1494-1499.

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AU - Chandrasekaran, Rajiv

AU - Lai, Kuei-Chiang

AU - Shynk, John J.

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N2 - In this paper, we analyze the performance of a subspace algorithm that separates cochannel TDMA signals using an adaptive antenna array. The algorithm processes a block of data in two passes. In the first pass, the weight vector is constrained to lie in a subspace that contains the direction vector of the signal of interest and is orthogonal to the subspace spanned by the direction vectors of the interferers. In the second pass, this weight vector is modified by projecting it onto an appropriate subspace determined by the cochannel interferers. The analysis includes expressions for the beamformer weights and the mean-square error in terms of the signal direction vectors. These results allow one to numerically evaluate the performance of the subspace algorithm for different cochannel scenarios.

AB - In this paper, we analyze the performance of a subspace algorithm that separates cochannel TDMA signals using an adaptive antenna array. The algorithm processes a block of data in two passes. In the first pass, the weight vector is constrained to lie in a subspace that contains the direction vector of the signal of interest and is orthogonal to the subspace spanned by the direction vectors of the interferers. In the second pass, this weight vector is modified by projecting it onto an appropriate subspace determined by the cochannel interferers. The analysis includes expressions for the beamformer weights and the mean-square error in terms of the signal direction vectors. These results allow one to numerically evaluate the performance of the subspace algorithm for different cochannel scenarios.

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