System and method for reducing on-chip memory for frame buffer storage in WCDMA receiver

A system for reducing an on-chip memory associated with storing frame buffer in WCDMA receiver, said system comprising:

• (i) a WCDMA transmitter that transmits a signal to said WCDMA receiver;
• (ii) said WCDMA receiver configured to receive said signal from said WCDMA transmitter, said WCDMA receiver comprising:
• (a) a WCDMA front end receiver;
• (b) an analog to digital convertor communicatively associated with said WCDMA front end receiver and configured to generate a plurality of digital input samples using said received signal, wherein said plurality of digital input samples comprises at least one bit per input sample;
• (c) a sample rate convertor communicatively associated with said analog to digital converter and configure to convert a sampling rate associated with said plurality of digital input samples to a desired sampling rate for a rake receiver;
• a digital to digital sigma-delta converter communicatively associated with said sample rate converter and configured to quantize said plurality of digital input samples with a first number of bits to a plurality of converted data samples with reduced number of bits, wherein a noise is introduced when said plurality of digital input samples are quantized to said plurality of converted data samples;
• (e) a memory unit communicatively associated with said digital to digital sigma delta converter and configured to store said plurality of converted data samples with said reduced number of bits, wherein a memory associated with storing said reduced number of bits is lesser than a memory associated with storing said first number of bits;
• (f) a digital low pass filter communicatively associated with said memory unit and configured to filter said noise from said plurality of converted data samples obtained from said memory unit to generate a plurality of noise filtered converted data samples of said reduced number of bits;
• and
• (g) a WCDMA receiver processing unit communicatively associated with said digital low pass filter and configured to receive said noise filtered converted data samples which are decoded over an entire radio frame.

A method of reducing an on-chip memory associated with storing frame buffer in WCDMA receiver, said method comprising:

• (i) obtaining, at a WCDMA front end receiver, a signal;
• (ii) generating, by an analog to digital convertor of said WCDMA receiver, a plurality of digital input samples and transmitting said generated digital input samples to a sample rate converter of said WCDMA receiver, wherein said plurality of digital input samples comprises at least one bit per input sample;
• (iii) converting, said sample rate convertor, a sampling rate associated with said plurality of digital input samples to a desired sampling rate for a rake receiver;
• (iv) quantizing, by a digital to digital sigma-delta converter of said WCDMA receiver, said plurality of digital input samples with a first number of bits to a plurality of converted data samples of a reduced number of bits, wherein a noise is introduced when said plurality of digital input samples are converted to said plurality of converted data samples;
• (v) storing, at a memory unit of said WCDMA receiver, said plurality of converted data samples with said reduced number of bits;
• (vi) filtering, at a digital low pass filter of said WCDMA receiver, said noise from said plurality of converted data samples to obtain a plurality of noise filtered converted data samples of said reduced number of bits;
• and
• (vii) decoding, at a WCDMA receiver processing unit of said WCDMA receiver, said plurality of noise filtered converted data samples over an entire radio frame.