US 6,687,238 B1 · CDMA signal transmission control

Abstract

The invention is a CDMA transmission control technology that includes various combinations of the following functionality: decresting, in-band to out-of-band ratio (RIO), power control, and spectral shaping. Decresting reduces peaks in the CDMA signal. RIO generates a ratio based on the signal strength of in-band versus out-of-band portions of the CDMA signal. Power control adjusts the gain of the CDMA signal based on quadrature signal calculations. Spectral shaping attenuates in-band portions of the CDMA signal adjacent to the corner frequencies. The CDMA transmission control technology can be implemented in a CDMA base station to extend range and capacity.

Claims42

Dependent claims

A device for processing a Code Division Multiple Access (CDMA) signal, the device comprising:

decresting logic operational to reduce peaks exceeding a threshold in the CDMA signal;
and
spectral shaping logic operational to attenuate in-band signal power near corner frequencies of the CDMA signal, wherein said in-band signal power is contained within bandwidth defined by said corner frequencies around a center frequency.

Dependencies are inferred from the claim text.

Facts

Application

09/265,204Filed 10 Mar 1999

Granted

3 Feb 2004

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

H04W 52/246
Using SIR [Signal to Interference Ratio] or other wireless path parameters: where the output power of a terminal is based on a path parameter…
H04B 1/707
Spread spectrum techniques: using direct sequence modulation
H04W 52/52
Transmission power control [TPC]: using AGC [Automatic Gain Control] circuits or amplifiers
H04B 2201/70706
Relating to direct sequence modulation: with means for reducing the peak-to-average power ratio

CDMA signal transmission control

Life of this patent

CDMA signal transmission control

Life of this patent

Abstract

Claims42