Uppsala universitet

Combined Spatial and Temporal Equalization Using an Adaptive Antenna Array and a Decision Feedback Equalization Scheme

Erik Lindskog, Anders Ahlén and Mikael Sternad

IEEE International Conference on Acoustics, Speech and Signal Processing, Detroit, MI, May 8-12, 1995. © 1995 IEEE.

When digital data are transmitted over multipath radio channels, the use of base station receivers with multiple antenna elements can improve the performance significantly, if the measurements are combined in an appropriate way. The paper studies ways to perform this combination in TDMA systems. A key problem is that a large number of filter coefficients may have to be adjusted based on short training sequences.

The purpose of this paper is to investigate the use of combined spatial and temporal equalization, in particular for short training sequences. The motivation for combining spatial and temporal equalization is the existence of multipath propagation and co-channel interference.

Our main concern is to obtain good performance yet low complexity. We will suggest a low complexity algorithm utilizing a circular antenna array. Although it has inferior performance in an asymptotic sense, it turns out to be superior to the general solution for short training sequences.

This conclusion is supported by simulations where a number of algorithms are evaluated for different scenarios involving co-channel interference.

Related publications:
PhD Thesis by Erik Lindskog.
Licentiate Thesis by E Lindskog 1995, which includes the paper.
Conference paper in IEEE VTC'95, which investigates related algorithms.

Pdf, 202K.

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