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Abstract

A method and apparatus are described for estimating channels in a radio communication system using transmit diversity. Channel coefficients g.sub.11,g.sub.12,g.sub.21,g.sub.22 associated with a transmit diversity channel may be estimated in a radio communication system having a Base Station (BS) and at least one Mobile Station (MS) includes a transmit diversity channel transmitted over at least two propagation paths from at least two antennas associated with a BS. A sequence of pilot symbols is provided for each of at least two antennas for transmission from the BS to a MS over the transmit diversity channel. A series of symbols r.sub.1, r.sub.2, r.sub.3, r.sub.4 are received at the MS from the transmit diversity channel and a matrix P of values of the sequence of pilot symbols is established according to a relation which satisfies a full rank condition for the matrix P which may be stored together with P.sup.-1 in a memory. Channels estimates are determined using the matrix and the received sequence.

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First Claim