Configurable all-digital coherent demodulator system for spread spectrum applications

A configurable receiver for a CDMA system, the receiver comprising:

• an RF/IF stage for receiving an analog signal;
• an analog-to-digital (A/D) converter for converting the analog signal to a digital signal;
• a chip-matched filter for filtering the digital signal;
• and
• at least one configurable digital coherent demodulator system for feed forward phase correcting the filtered digital signal,
• wherein the at least one configurable digital coherent demodulator system comprises a configurable pilot channel parameter estimator for processing a signal based on the filtered digital signal and having an input for receiving a configurable accumulator length to allow the parameter estimator to be configured for a given user, application, and/or performance level.

A configurable receiver for a CDMA system, the receiver comprising:

• an RF/IF stage for receiving an analog signal;
• an analog-to-digital (A/D) converter for converting the analog signal to a digital signal;
• a chip-matched filter for filtering the digital signal;
• and
• at least one configurable digital coherent demodulator system for feed forward phase correcting the filtered digital signal,
• wherein the at least one configurable digital coherent demodulator system comprises a configurable correction device having an input for receiving a configurable delay value which establishes an amount of delay between the configurable correction device receiving a sample of a demodulated signal, which is based on the filtered digital signal, and transmitting the sample.

A method of processing data using a configurable CDMA receiver, the method comprising the steps of:

• a) receiving an analog signal at an RE/IF stage;
• b) converting the analog signal to a digital signal using an analog-to-digital (A/D) converter;
• c) filtering the digital signal using a chip-matched filter to obtain a complex channel signal;
• d) processing the complex channel signal using a configurable demodulator system which performs feed forward phase correction;
• e) demodulating a user code sequence from the complex channel signal to produce code demodulated sample;
• and
• f) communicating the code demodulated sample to a plurality of configurable traffic demodulators.

A method of processing data using a configurable CDMA receiver, the method comprising the steps of:

• a) receiving an analog signal at an RF/IF stage;
• b) convening the analog signal to a digital signal using an analog-to-digital (A/D) converter;
• c) filtering the digital signal using a chip-matched filter to obtain a complex channel signal;
• d) processing the complex channel signal using a configurable demodulator system which performs feed forward phase correction;
• and
• e) feeding forward a digital phase correction signal, which is based on the complex channel signal, within each of a plurality of configurable coherent demodulator systems to respectively correct a phase error in each of a plurality of a demodulated multipath data signals, which are based on the complex channel signal.

A method of processing data using a configurable CDMA receiver, the method comprising the steps of:

• a) receiving an analog signal at an RF/IF stage;
• b) converting the analog signal to a digital signal using an analog-to-digital (A/D) converter;
• c) filtering the digital signal using a chip-matched filter to obtain a complex channel signal;
• and
• d) processing the complex channel signal using a configurable demodulator system which performs feed forward phase correction, wherein step d) includes the following sub steps:
• d1) receiving a configurable pilot filter length at a configurable pilot channel estimator portion provided within the configurable demodulator system;
• and
• d2) generating a digital error correction signal, which is based on the complex channel signal, using an open loop phase estimator provided within the pilot channel estimator portion.