Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
1993-03-25
1995-08-08
Chin, Stephen
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
371 43, 375346, 375348, 375284, 375285, H03D 106
Patent
active
054405882
ABSTRACT:
A maximum likelihood sequence estimation capable of reducing an amount of real time calculations involved and improving a high speed follow up characteristic. N-dimensional vectors corresponding to all possible transmission sequence candidates of a prescribed length, which are pre-calculated according to a prescribed definition, are stored in a memory. Then, an estimated received signal for each one of the branches at the present sampling time is obtained by calculating an inner product of one of the N-dimensional vectors stored in the memory corresponding to each transmission sequence candidate resulting from each one of the branches reaching to each state at the present sampling time with the N-dimensional received signal vector for the present sampling time obtained from at least N received signals for at least N previous sampling times. The maximum likelihood sequence can be estimated as a survivor path for each state at the present sampling time according to this estimated received signal as usual.
REFERENCES:
patent: 5272726 (1993-12-01), Furuya et al.
Chin Stephen
Kabushiki Kaisha Toshiba
Luther William
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