Adaptive maximum likelihood sequence estimation apparatus and adaptive maximum likelihood sequence estimation method

摘要

An adaptive maximum likelihood sequence estimation apparatus includes a first estimation unit for estimating a transmission signal sequence from received signals on the basis of an estimated transmission path impulse response. A second estimation unit estimates an estimated received signal at time k on the basis of a known signal sequence or the transmission signal sequence estimated by the first estimation unit, and a transmission path impulse response estimated at time k-1. An error signal generation unit generates an error signal on the basis of a received signal at time k and the estimated received signal at time k. A third estimation unit estimates a transmission path impulse response at time k using a predetermined adaptive algorithm on the basis of the error signal. Furthermore, the third estimation unit estimates a transmission path impulse response by a non-recursive calculation during the reception period of a known signal sequence of the received signal, and estimates a transmission path impulse response by a recursive calculation during the reception period of an unknown data signal sequence of the received signals following the known signal sequence period.