System and method for a direct conversion multi-carrier processor

Abstract

A method for a radio communications device such as a receiver, transmitter or transceiver provides direct conversion of quadrature signals between a radio frequency signal and a plurality of resolved channels. The method provides block processing of multiple RF carriers in a wireless communication system using a direct conversion transmitter/receiver and baseband signal processing.

1 . A method for receiving and processing a multi-carrier radio frequency (RF) signal comprising: 
 receiving the multi-carrier RF signal;    amplifying the received multi-carrier RF signal;    demodulating and converting the multi-carrier RF signal into in-phase (I) and quadrature (Q) baseband signals;    processing the I baseband signal by low pass filtering and amplifying and then converting the I baseband signal to a digital I signal;    processing the Q baseband signal by low pass filtering and amplifying and then converting the Q baseband signal to a digital Q signal; and    converting the digital I and Q signals into a plurality of channel signals.    
   
   
       2 . The method of  claim 1  further comprising finite impulse response (FIR) filtering each of the plurality of channel signals.  
   
   
       3 . The method of  claim 1  further comprising controlling the bandwidth of the low pass filtering.  
   
   
       4 . A method for processing and transmitting a plurality of channel signals comprising: 
 digitally up converting said plurality of channel signals into a digital in-phase (I) signal and a digital quadrature (Q) signal corresponding to said plurality of channel signals;    converting said digital I signal to an I analog signal at a baseband frequency and converting said digital Q signal to a Q analog signal at a baseband frequency;    modulating said analog baseband I and Q signals to provide a combined radio frequency (RF) signal; and    transmitting said combined RF signal.    
   
   
       5 . The method of  claim 4  further comprising amplifying said combined RF signal prior to transmission.  
   
   
       6 . The method of  claim 5  further comprising low pass filtering each of said analog I signal and said analog Q signal.  
   
   
       7 . The method of  claim 6  further including controlling the frequency response of the transmission by controlling the bandwidth of said low pass filtering.  
   
   
       8 . The method of  claim 7  further comprising finite impulse response (FIR) filtering each channel signal prior to the digitally up converting.  
   
   
       9 . The method of  claim 4  further comprising low pass filtering each of said analog I signal and said analog Q signal.  
   
   
       10 . The method of  claim 9  further including controlling the frequency response of the transmission by controlling the bandwidth of said low pass filtering.  
   
   
       11 . The method of  claim 10  further comprising finite impulse response (FIR) filtering each channel signal prior to the digitally up converting.