Patent ID: 6282184
Filing Date: 2001-08-28
Classification: H04B,H04W

Abstract:
A receive section for a multichannel wireless communication system for processing a composite RF (radio frequency) signal containing RF signals each having an RF bandwidth associated with a respective air interface standard, the receive section comprising:a first antenna for receiving the composite RF signal;a wideband receiver connected to the first antenna for down-converting the composite RF signal to produce a down-converted signal;an A-D (analog-to-digital) converter connected to the wideband receiver for performing an analog-to-digital conversion on the down-converted signal to produce a first composite digital signal at a common digitizing rate;for each particular air interface standard:a) an associated RX (receive) channelizer bank connected to receive the first composite digital signal from the A-D converter for adjusting the first composite digital signal data rate to a corresponding standard DSP (digital signal processing) data rate specified by the associated air interface standard to produce a respective adjusted composite digital signal and for extracting from the respective adjusted composite digital signal a respective set of channelized digital signals; andb) a first set of DSP units connected to the RX channelizer bank for digitally processing and demodulating the corresponding set of channelized digital signals to produce a first set of digital channel signals each having an associated channel bandwidth corresponding to the particular air interface standard;wherein the wideband receiver comprises an AGC (automatic gain control) circuit comprising:a controller connected to the D-A converter to compare the D-A converter output to a predetermined reference level for providing a receiver gain setting; andan actuator for applying the receiver gain setting, the actuator having an input port for receiving the down-converted signal, a control port for receiving the gain control setting and an output port for providing a gain controlled down-converted signal to the A-D converter.