Importance

Loading Importance Indicators...

Abstract

A method for adaptation to the time-variable channel impulse response during a burst in receivers for TDMA mobile radio systems, each burst including in the center a test sequence which is known to the receiver and by means of which an initial estimate of the channel impulse response is possible, wherein the received signal of a burst is suitably sampled, the received burst is divided in 2N+1 sectors A.sub.-N, . . . , A.sub.+N, it being assumed that the channel impulse response can be regarded as being constant within a sector, a vector x of dimension (2N+1)L is defined, L being the number of channel impulse response coefficients and the (iL+l)-th component of x, -N.ltoreq.i.ltoreq.+N, 0.ltoreq.l.ltoreq.L-1 is initialized before the start of the detection using the l-th coefficient of the estimated value of the channel impulse response obtained from the test sequence, Matrices E, E.sub.i, E.sub.ii, S and vectors x.sub.i, d, r.sub.i are defined, each burst is processed in 2N steps, where in the k-th step, the i-th sector is detected using the components iL, . . . ,(i+1)L-1 of the vector x, where the sector A.sub.i is selected in accordance with a suitable method, for example that described in [5], the matrix P=E.sub.i S*[.sigma..sup.2 I+SE.sub.ii S*].sup.-1 is calculated, and the recursions x:=x+Pd E:=E+PSE.sub.i.sup.* are carried out.

First Claim