Time-domain diversity combining of signals for broadcast receivers

摘要

Systems and methods are disclosed for time-domain diversity combining of radio frequency (RF) broadcast signals. Two channelized quadrature (I/Q) signals are generated by different tuner circuitry coupled to two different antennas, are converted to frequency-domain signals, and are used to generate frequency-domain diversity weighting signals. The frequency-domain diversity weighting signals are then converted to time-domain weights and applied to the channelized I/Q signals. The weighted and channelized I/Q signals are then combined in the time-domain to provide a time-domain diversity combined signal. The resulting combined signal can be further processed, as desired, such as by using a demodulator to generate demodulated output signals. Disclosed methods and systems can be applied to a variety of receiver systems configured to receive RF broadcast signals.

主权项

1. A diversity receiver system, comprising:
first tuner circuitry configured to receive a radio frequency (RF) signal from a first antenna and to down-convert, digitize, and channelize the RF signal to generate a first time-domain channelized quadrature (I/Q) signal; second tuner circuitry configured to receive a radio frequency (RF) signal from a second antenna and to down-convert, digitize, and channelize the RF signal to generate a second time-domain channelized quadrature (I/Q) signal; and time-domain diversity combining circuitry configured to receive the first and second channelized I/Q signals, to convert the first and second channelized I/Q signals to frequency-domain signals, to analyze the frequency-domain signals to determine frequency-domain diversity weights for the first and second channelized I/O signals, to convert the frequency-domain diversity weights into at least one set of time-domain diversity weights, and to apply the time-domain diversity weights to generate a combined time-domain diversity I/Q signal based upon the first and second time-domain channelized I/Q signals; wherein the time-domain diversity combining circuitry comprises:
first FFT (Fast Fourier Transform) circuitry coupled to receive the first time-domain channelized I/Q signal and to output a first frequency-domain signal having multiple frequency components;second FFT circuitry coupled to receive the second time-domain channelized I/Q signal and to output a second frequency-domain signal having multiple frequency components;weight processing circuitry configured to receive the first and second frequency-domain signals and to generate the frequency-domain diversity weights; andIFFT (Inverse Fast Fourier Transform) circuitry coupled to receive the frequency-domain diversity weights and to generate the at least one set of time-domain diversity weights.