Patent ID: 6798850
Filing Date: 2004-09-28
Classification: H04B,H04L,H04W

Abstract:
A multi-standards radio receiver system comprising:an antenna unit for receiving a radio frequency (RF) signal; a radio frequency unit for downconverting the received RF signal to an intermediate frequency (IF) signal; an A/D-converter for sampling the IF signal with a certain sampling rate and digitizing the sampled signal into a digital signal; a channelizer for filtering out at least two modulated channels from the digital signal, wherein a first channel is modulated according to a Time Division Multiple Access (TDMA) radio communication standard, and a second channel is modulated according to a Code Division Multiple Access (CDMA) radio communication standard, wherein the TDMA and CDMA communication standards have different chip or symbol rates, and the AND converter adjusts the sampling rate in accordance with the chip or symbol rate of a selected one of the TDMA or CDMA standards; and at least two demodulating units, wherein a first demodulating unit demodulates the TDMA channel, and a second demodulating unit demodulates the CDMA channel, each of the demodulating units detecting and delivering a corresponding demodulated channel without having to resample the selected TDMA or CDMA channel.