Multimode receiver architecture

摘要

A radio receiver comprising a compensator arranged to compensate for intersymbol interference in a signal received at the receiver and a configurator arranged to configure the compensator, wherein the compensator comprises a programmable filter and the configurator is capable of configuring the filter in a first mode to operate as an ISI equaliser or in a second mode to implement a RAKE finger set.

主权项

1. A radio receiver, comprising:
a radio frequency (RF) front end configured to convert a radio signal received at the radio receiver to a baseband signal at a first oversampling rate; a downsampling unit configured to downsample the baseband signal from the first oversampling rate to a second oversampling rate; a filter configured to produce a filtered signal by filtering the baseband signal at the second oversampling rate using configurable filter coefficients; a symbol rate conversion unit configured to convert the filtered signal to a symbol-rate signal; a channel estimation unit configured to calculate a channel impulse response estimate based on the baseband signal at the second oversampling rate; a minimum mean-square error (MMSE) weights calculation unit configured to calculate a first set of filter coefficients for minimum mean-square error (MMSE) equalization, the first set of filter coefficients being based on the channel impulse response estimate; a finger determination unit configured to identify a set of RAKE finger positions based on the baseband signal at the first oversampling rate; and a maximum ratio combining (MRC) weights calculation unit configured to calculate a second set of filter coefficients based on the channel impulse response estimate and the set of RAKE finger positions, the second set of filter coefficients causing the filter in conjunction with symbol rate conversion unit to operate as a RAKE receiver, wherein the filter uses the first set of filter coefficients as the configurable filter coefficients during a first mode and uses the second set of filter coefficients as the configurable filter coefficients during a second mode.