Patent ID: 7809047
Filing Date: 2010-10-05
Classification: H04B

Abstract:
1. A cellular repeater having an uplink path and a downlink path and configured for use with a donor antenna and coverage antenna for handling wireless signals, the repeater, in each of those paths, comprising: an input analog mixer for frequency down conversion of an input signal to an antenna; an analog-to-digital converter communicating with an output of said input analog mixer to convert the input signal into a digital repeater signal; an echo cancellation circuit communicating in-line with an output of said analog-to-digital converter and operable to reduce an echo signal portion of an input signal to an antenna coupled to the repeater, wherein the echo signal portion is wirelessly received from another antenna coupled to the repeater; an adaptive complex filter operably coupled with the echo cancellation circuit for providing a cancellation signal to the echo cancellation circuit to reduce the echo signal portion in the input signal; a DSP processor coupled to the adaptive complex filter and operable for adjusting the filter coefficients of the filter to thereby adjust the cancellation signal produced by the adaptive complex filter; a digital down-conversion circuit coupled in-line in the circuit; decimation and filter circuitry coupled in-line in the circuit for digitally reducing the sampling rate of the digital signal; a digital band pass channel filter operably receiving the down-converted and digitally reduced signal, the DSP processor coupled for configuring the band pass channel filter to determine the operating band of the repeater; a digital up-conversion circuit communicating with an output of said digital band pass channel filter; interpolation and filter circuitry coupled in-line in the circuit for digitally increasing the sampling rate of the digital signal; each of said digital up-conversion and down- conversion circuits having a quadrature modulation circuit and sharing a digital oscillator; a digital-to-analog converter communicating with an output of said digital band pass channel filter for converting the digital repeater signal to an analog output signal; an output analog mixer for frequency up-conversion, said output analog mixer communicating with an output of said digital-to-analog converter.