OQPSK phase and timing detection

Details OQPSK phase and timing detection OQPSK phase and timing detection

1998-12-30

2000-06-13

Mis, David

Demodulators

Phase shift keying or quadrature amplitude demodulator

329307, 329310, 375324, 375329, H03D 300, H03K 910, H04L 2722, H04L 27227

Patent

active

060754087

ABSTRACT:
A method and an apparatus for generating an error estimate as input for an error recovery loop of a demodulator which receives an offset quadrature phase shift keyed (OQPSK) signal having a symbol interval. The method comprises the following operations: (a) receiving at least four consecutive complex samples z.sub.-1/2, z.sub.0, z.sub.1/2 and z.sub.1 obtained by sampling the OQPSK signal at half the symbol interval; and (b) computing the error estimate based on the complex samples z.sub.-.sub.1/2, z.sub.0, z.sub.1/2 and z.sub.1.

REFERENCES:
patent: 5945875 (1999-08-01), Zhou et al.

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