| US 7,539,167 B2 | ||
| Spread spectrum receiver and method for carrier frequency offset compensation in such a spread spectrum receiver | ||
| Lisa Meilhac, St Laurent du Var (France); and Jonathan Adlard, Sheffield (United Kingdom) | ||
| Assigned to NewLogic Technologies GmbH, Lustenau (Austria) | ||
| Filed on Jan. 05, 2006, as Appl. No. 11/326,001. | ||
| Claims priority of application No. 10 2005 001 696 (DE), filed on Jan. 13, 2005. | ||
| Prior Publication US 2006/0171361 A1, Aug. 03, 2006 | ||
| Int. Cl. H04B 7/216 (2006.01); H04J 3/06 (2006.01); H04B 1/00 (2006.01) | ||
| U.S. Cl. 370—335 [370/342; 370/516; 375/136] | 14 Claims |
| 1. A spread spectrum receiver for receiving and decoding an input signal r(k) consisting of a sequence of chips, the receiver
comprising:
a correlator for processing the input signal r(k) and providing at its output a signal y(n) which consists of a sequence of
symbols;
a phase rotator, coupled to an output of the correlator, for rotating the phase of the signal y(n) based on a filtered phase
error signal θ(n) in order to compensate a carrier frequency offset Ω contained in the input signal r(k);
a detector, coupled to an output of the phase rotator, for receiving the rotated signal z(n) and for taking a decision on
the symbols and providing on an output an output signal c(n) which can subsequently be demapped to a sequence of bits,
an error signal generator, coupled to the outputs of the phase rotator and the detector, for generating a phase error signal
e(n) which depends on the carrier frequency offset of the input signal r(k),
a loop filter, coupled to an output of the error signal generator, for filtering the phase error signal e(n) and feeding the
filtered phase error signal θ(n) to the phase rotator, and
a phase pre-compensation block which comprises a phase pre-compensation estimator, a pre-compensation signal generator and
a pre-compensation phase rotator.
|