Antenna diversity combining for differentially modulated orthogonal frequency division multiplexed (OFDM) signals

摘要

In an embodiment, an apparatus includes a first tuner to receive a radio frequency (RF) signal from a first antenna and to process the RF signal to generate a first time-domain quadrature signal, a second tuner to receive the RF signal from a second antenna and to process the RF signal to generate a second time-domain quadrature signal, and a combiner circuit to receive the first and second time-domain quadrature signals.

主权项

1. An apparatus comprising:
a first tuner configured to receive a radio frequency (RF) signal from a first antenna and to process the RF signal to generate a first time-domain quadrature signal; a second tuner configured to receive the RF signal from a second antenna and to process the RF signal to generate a second time-domain quadrature signal; a combiner circuit configured to receive the first and second time-domain quadrature signals, the combiner circuit including:
a first path circuit configured to convert the first time-domain quadrature signal to a first frequency-domain signal and to differentially decode the first frequency-domain signal;a second path circuit configured to convert the second time-domain quadrature signal to a second frequency-domain signal and to differentially decode the second frequency-domain signal; anda first combiner configured to combine the first and second decoded frequency-domain signals into a combined frequency-domain signal; a re-encoder coupled to the first combiner to generate an estimated signal based on the combined frequency-domain signal; a first filter configured to filter the first time-domain quadrature signal based at least in part on the estimated signal; a second filter configured to filter the second time-domain quadrature signal based at least in part on the estimated signal; and a second combiner configured to combine the filtered first and second time-domain quadrature signals.