US 6,888,877 B2Granted

CDMA receiver

AssigneeInfineon Technologies AG

InventorsMarkus Doetsch, Tideya Kella, Peter Schmidt, Peter Jung, Joerg Plechinger, Michael Schneider

Life of this patent

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Abstract

CDMA Receiver. According to one embodiment, a CDMA receiver is provided for receiving a CDMA signal in a multi-subscriber environment. The multi-subscriber environment can include a receiving device for receiving the CDMA signal. Further, the environment can include a Rake receiving circuit for detection of signal components of the CDMA signal which are transmitted via the various signal paths. The environment can also include a channel estimation circuit for estimating channel coefficients of a transmission channel coefficient h of a transmission channel H by means of a predetermined reference data sequence contained in the received CDMA signal. A weighting coefficient calculation device can calculate weighting coefficients for the various signal components of the CDMA signal. Further, the environment can include a weighting circuit for weighting the signal components with the calculaed weighting coefficients. A combiner can combine the weighted signal components to form an estimated received data signal.

Claims11

Dependent claims

CDMA receiver for receiving a CDMA signal, which is transmitted at a chip clock rate from a transmitter via various signal paths of a physical transmission channel, in a multi-subscriber environment having:

(a) a receiving device for receiving the CDMA signal;
(b) a Rake receiving circuit having a number of parallel-connected delay devices for detection of signal components of the CDMA signal which are transmitted via the various signal paths;
(c) a channel estimation circuit for estimating channel coefficients h of a transmission channel H by means of a predetermined reference data sequence which is contained in the received CDMA signal;
(d) a weighting coefficient calculation device for calculating weighting coefficients m for the various signal components of the CDMA signal as a function of the estimated channel coefficients h and of stored spreading and scrambling codes;
(e) a weighting circuit for weighting the signal components with the calculated weighting coefficients m;
and having
(f) a combiner for combining the weighted signal components to form an estimated received data signal.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/936,771Filed 17 Jan 2001
Priority: DE 100 01 64917 Jan 2000
Published: US 2004/0213332 A128 Oct 2004
Granted: 3 May 2005
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H04B 1/712
Constructive combining of multi-path signals, i.e. RAKE receivers: weighting of fingers for combining, e.g. amplitude control or phase rotation…
H04B 1/7103
Interference-related aspects: the interference being multiple access interference
H04J 13/0044
Orthogonal: oVSF [orthogonal variable spreading factor]
H04B 2201/70701
Relating to direct sequence modulation: featuring pilot assisted reception