Method and apparatus to adaptively control the frequency of rece

Details Method and apparatus to adaptively control the frequency of rece Method and apparatus to adaptively control the frequency of rece

1995-09-01

1996-12-03

Tse, Young T.

Pulse or digital communications

Receivers

Angle modulation

375283, 329304, H04L 2722

Patent

active

055815790

ABSTRACT:
In a digital wireless communication system operating between a first unit and a second unit, the first unit transmits a digitally encoded RF signal at a first frequency in a plurality of a non-contiguous time slots to the second unit. The second unit receives the digitally encoded RF signals. The received RF digitally encoded signal is converted to an intermediate frequency (IF). An A to D converter samples the received IF digitally encoded signals and generates a plurality of discrete binary symbols during one of the plurality of non-contiguous time slots. A phase error signal is generated for each one of the plurality of discrete binary symbols. A frequency error signal is generated for the subsequent symbol in accordance with .DELTA.f(n+1)=.DELTA.f(n)+g.sub.1 (.crclbar.(n)-.crclbar.(n)). The conversion of the RF signal to intermediate frequency is controlled in response to the frequency error signal. The control is adjusted after the one time slot but prior to the commencement of a subsequent one of the plurality of non-contiguous time slots.

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