Patent ID: 8514785

Claim:
A wireless communications device for transmitting and receiving Long Term Evolution (LTE) and Wideband Code Division Multiplexed (WCDMA) signals on adjacent frequency bands, the communications device comprising: a Radio Frequency (RF) receiver interface that generates a received baseband signal including a WCDMA received signal and a LTE received signal from a received RF signal, wherein the RF receiver interface includes an Analog to Digitgal Converter (ADC) that generates the received baseband signal having a sampling frequency corresponding to a combined channel bandwidth including a WCDMA channel bandwidth and a LTE channel bandwidth; and a baseband circuit including a receiver baseband circuit connected to the RF receiver interface, wherein the receiver baseband circuit comprises: a first time-frequency conversion circuit that converts the received baseband signal to a frequency domain signal based on a time frequency conversion size corresponding to the combined channel bandwidth to the frequency domain signal; a separator that separates the frequency domain signal to a frequency domain WCDMA signal and a frequency domain LTE signal; a Root Raised Cosine (RRC) filter coupled to the separator that root-raised cosine filters the frequency domain WCDMA signal and generates a filtered WCDMA signal; and a first frequency-time conversion circuit that converts the filtered WCDMA signal to a time domain WCDMA signal.