Data rate estimation in a communication system

Details Data rate estimation in a communication system Data rate estimation in a communication system

2007-02-20

2007-02-20

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

Reexamination Certificate

active

10149150

ABSTRACT:
The present invention relates to a method and a circuitry for estimating a spreading factor and/or data transmission rate in a communication system that employs variable data transmission rates. A received transmission signal is analyzed in order to estimate noise variances for those spreading factors that are possible for a data frame in the signal. The estimate is based on information that is determined by assuming that the smallest possible spreading factor was used for the transmission of the signal. The estimates are then scaled by predefined constants, each of the constants depending on the respective possible spreading factor. The smallest one of the scaled estimates is determined, whereafter the most probable spreading factor of the received data frame is determined based on the smallest variance estimate.

REFERENCES:
patent: 5978428 (1999-11-01), Hayashi
patent: 0 913 971 (1999-05-01), None
Sheung C N et al: “Rate determination algorithms in IS-95 forward traffic channels” IEEE Vehicular Technology Conference, May 18, 1998, XP002096679 p. 2188.
Kwon K M et al: “One Viterbi Decoder with Data Rate Estimation for IS-95 Wireless Communication” Global Telecommunications Conference (GLOBECOM), US, New York, IEEE, Nov. 3, 1997, pp. 594-598, XP000737608.

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