System and method for correction of I/Q angular error in a satel

Details System and method for correction of I/Q angular error in a satel System and method for correction of I/Q angular error in a satel

1997-02-10

1998-09-22

Powell, Mark R.

Telecommunications

Wireless distribution system

455304, 455324, H04H 100

Patent

active

058129278

ABSTRACT:
A DBS receiver front end which converts the received signal directly to the baseband representation and maintains a high performance with a new techniques for tracking and counteracting frequency drift, and correcting I/Q angular error and amplitude imbalance. The DBS receiver front end comprises a tuner and a demodulator/decoder. The tuner receives a high frequency signal and converts it to a baseband signal having a frequency offset error. In one embodiment, the DBS receiver front end includes a demodulator/decoder which digitally performs I/Q angular error correction. The tuner converts the high frequency signal to a baseband signal having an in-phase and a quadrature-phase component. Ideally, the components are separated by ninety degrees, but typically an angular error exists. The demodulator/decoder includes an adaptive equalizer for correcting the angular error. Having the equalizer allows for relaxed tolerances in the tuner.

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patent: 5610948 (1997-03-01), Ninomiya et al.
patent: 5640670 (1997-06-01), Samueli et al.

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