of the input signal a control circuit is coupled to receive the output signal a first reference signal and a second reference signal the control circuit is arranged to produce a control signal in response to a comparison of the output signal the first reference signal and the second reference signal application_number US 80862104 A description referring now to fig7 a there is a first embodiment of a mobile unit of the present invention configured for blind detection of transmit diversity this blind detection scheme includes a new implementation of an algorithm disclosed by a wald sequential analysis 1947 mobile antenna 212 receives multipath signals transmitted by base station antennas at leads 180 and 182 fig1 respectively diplexer circuit 702 couples these received multipath signals to lead 704 during receive mode operation doppler frequency estimator circuit 740 is described in detail in copending u s patent application ser no 09 224 632 filed dec 31 1998 and incorporated herein by reference doppler frequency estimator circuit 740 receives the multipath signals on lead 704 and produces an output signal on lead 742 corresponding to the estimated doppler frequency delay profile estimator circuit 720 also receives the multipath signals on lead 704 delay profile estimator circuit 720 includes a despreader circuit as in fig6 and a match filter circuit not shown the delay profile estimator circuit 720 determines which of the received multipath signals should be combined based on the strength of the matched filter output operation of the measurement circuit 746 will now be explained in detail with reference to fig7 c the measurement circuit 746 receives pilot symbol data from received multipath signals on lead 704 channel estimate circuit 750 generates separate diversity signals x 1 and x 2 corresponding to antennas on leads 180.