Uppsala universitet

Making SMI-Beamforming Insensitive to the Sampling Timing for GSM Signals

Erik Lindskog

6th International IEEE Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC'95),
Toronto, Canada, September 27-29 1995, pp 664-668. © 1995 IEEE.

Beamforming with the Sample Matrix Inversion method (SMI), using an antenna array, is considered for a GSM-signal. The problem of generating the reference signal from the training sequence is addressed. As the proper reference signal to be used varies with the sampling timing within the symbol interval, a modified SMI method is proposed that uses a ``variable'' reference signal.

When working with a short training sequence, as in GSM, the performance of the standard SMI beamforming method is shown to degrade when there is an offset from the sampling instant that the reference signal was designed for. The proposed modified SMI method, however, is shown to be more or less insensitive to where in the symbol interval the sampling takes place.

The proposed method achieves a better mean performance, averaged uniformly over one symbol interval.

Related publications:
PhD Thesis by Erik Lindskog.
Licentiate Thesis by E Lindskog 1995, which includes the paper.
Conference paper Asilomar 95, on estimating co-channel interference from adjacent frames.

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