Method and apparatus for regulation of the effective noise figure in a CDMA receiver

Inactive Publication Date: 2001-08-09
JIN XIN +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

0007] An object of the present invention is to provide an improved CDMA rec

Problems solved by technology

This may temporarily degrade the forward link performance of the network and possibly cause the calls in other cells/sectors close to the activating cell/sector to be dropped due to the sudden increase of channel interference from the activating cell/sector.
In addition, the sudden deactivation of a cell/sector will result in calls in the cel

Method used

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  • Method and apparatus for regulation of the effective noise figure in a CDMA receiver
  • Method and apparatus for regulation of the effective noise figure in a CDMA receiver
  • Method and apparatus for regulation of the effective noise figure in a CDMA receiver

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Embodiment Construction

[0025] FIG. 1 of the annexed drawings illustrates a CDMA receiver implementing the regulation function of effective noise Figure in accordance with the present invention. The receiver comprises a plurality of antennas 100. In the example shown, N different antennas are provided, the antennas may be from different sectors of a given cell, for example. The RF signal received by a given antenna is then introduced into M separate channels. Those channels share a common analog processing stage 102. In the example shown, the common analog processing stage 102 includes a frequency downconverter, whose function is to reduce the frequency of the received signal to a certain IF frequency. The analog processing stage may also include frequency selective filters. For simplicity, those components are not detailed in the drawings because they are known to those skilled in the art. The signal generated by the common analog processing stage 102 is supplied to an analog to digital converter (ADC) 10...

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Abstract

The present invention relates to a method for effecting regulation of the effective noise figure of a CDMA (Code Division Multiple Access) receiver. The regulation process can be used to control the receiver during the activation/deactivation of a cell/sector in a CDMA wireless system and during normal operation when the service area of the cell/sector needs to enlarge or shrink. In a most preferred embodiment the CDMA receiver includes a source of pseudo-random noise that is injected in the received signal, downstream of the signal digitization stage. A power detector measures the power in the received digitized signal and a program logic determines the amount of noise figure degradation to be applied. The actual noise power regulation is effected by multiplying the output of the noise generator by a weighing factor. In a multi-channel CDMA system, each channel is provided with an independent system to regulate the effective noise power figure degradation, thus allowing to effect a noise figure regulation on a channel by channel basis.

Description

[0001] This invention relates in general to wireless communications and, more particularly to a method and apparatus for regulating the effective noise figure of a CDMA receiver in a base station. The regulation may be effected to control the blossoming / breathing or wilting functions of a CDMA communication system.[0002] In a CDMA wireless system the activation or deactivation of a cell / sector affects the network. The sudden activation of the cell / sector causes a sudden increase in the total forward link power. This may temporarily degrade the forward link performance of the network and possibly cause the calls in other cells / sectors close to the activating cell / sector to be dropped due to the sudden increase of channel interference from the activating cell / sector. In addition, the sudden deactivation of a cell / sector will result in calls in the cell / sector been dropped. To avoid this problem, when a cell / sector is activated in a CDMA wireless system, the transmitted power of the tr...

Claims

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Application Information

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IPC IPC(8): H04B1/707
CPCH04B1/707
Inventor JIN, XINYANG, HONG-KUINIELSEN, JOHNMCGOWAN, NELLSTANIER, JEFF
Owner JIN XIN
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