Pulse or digital communications – Receivers – Angle modulation
Patent
1996-11-14
1999-09-28
Pham, Chi H.
Pulse or digital communications
Receivers
Angle modulation
375331, H03D 124, H03D 300
Patent
active
059600446
ABSTRACT:
A block phase estimator include a phase averaging circuit. A first embodiment of the phase averaging circuit includes a phase differencing circuit coupled to an averager input, a first modulo circuit coupled to the phase differencing circuit, a filter coupled to the first modulo circuit, and a summation circuit having an positive input and a negative input, the positive input being coupled to the averager input, the negative input being coupled to the filter. The phase averaging circuit further includes a second modulo circuit coupled to the summation circuit. An alternative embodiment of the phase averaging circuit includes a delay line having a plurality of taps coupled to an averager input and a plurality of first subtractor circuits, a first input of each first subtractor circuit being coupled to the averager input, a second input of each first subtractor circuit being coupled to a corresponding tap of the plurality of taps. A plurality of first modulo circuits are coupled to the plurality of first subtractor circuits, each first modulo circuit being coupled to a corresponding first subtractor circuit. A summation circuit is coupled to all first modulo circuits, and a scaling circuit is coupled to the summation circuit. The phase averaging circuit further includes a second subtractor circuit, a first input of the second subtractor circuit being coupled to the averager input, a second input of the second subtractor circuit being coupled to the scaling circuit.
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Barnhardt III Hubert J.
Gardner Kelly A.
Massaroni Kenneth M.
Pham Chi H.
Scientific-Atlanta, Inc.
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