A Baseband transmitter for a radio frequency (RF) communication device according to an embodiment of the present invention includes a single-carrier processor, a pulse shape filter, a multi-carrier processor and a signal combiner. The single-carrier processor generates a single-carrier signal at a first sample rate. The pulse shape filter includes multiple polyphase filters which filter the single-carrier signal according to a time shaping pulse that approximates a multi-carrier power spectrum and a sample switch that selects outputs of the polyphase filters at a second sample rate. The multi-carrier processor generates a multi-carrier signal at the second sample rate. The signal combiner combines the filtered single-carrier signal with the multi-carrier signal while maintaining phase, gain, frequency and timing alignment.
CROSS-REFERENCE TO RELATED APPLICATIONS
The present application is based on U.S. Provisional Patent Application entitled "Sample Rate Change Between Single-Carrier and Multi-Carrier Waveforms", Ser. No. 60/329,676, filed Oct. 16, 2001, which is hereby incorporated by reference in its entirety. The present application is also a continuation-in-part (CIP) of U.S. patent application entitled "Wireless Communication System Configured to Communicate Using a Mixed Waveform Configuration", Ser. No. 10/143,134, filed May 10, 2002 now U.S. Pat. No. 6,754,195, which is hereby incorporated by reference in its entirety.
