well as initial frequency tuning relative to vehicle doppler and synthesizer frequency drift with initial tuning established the controller 33 would initiate the frequency hop sequence of the demodulator numerically controlled oscillator 42 by sending a new frequency word every 2 msec the controller 33 would also maintain frequency and symbol synchronization with continuous inputs from the ts matched filter 32 and the adaptive equalizer 21 lastly the controller 33 would provide the symbol block deinterleaver 17 with a frame sync pulse indicating the arrival of a new frame every 66 msec fig7 is a logical schematic of the adaptive equalizer 21 in the mobile receiver to mitigate the intersymbol interference effects of delay spread in order to accommodate roughly 16 u03bcsec delay spread an equalizer with 8 to 10 taps is required the tap delays td 1 td 2 td n are 1 2 symbol increments or slightly less than 2 u03bcsec the equalizer illustrated in fig7 uses a least mean square error algorithm for setting and adjusting the tap weight coefficients this adaptive equalizer collects multipath energy over the delayed paths to form on a best estimate e of symbol phase it also provides a frequency discriminator output f to the controller for maintaining carrier synchronization unique acquisition and tracking techniques are incorporated into this design to overcome distortions of the fading multipath channel and to.