User equipment (UE) having an adaptive RF amplifier prelimiter

• US 6,920,127 B2
• Filed: 03/04/2002
• Issued: 07/19/2005
• Est. Priority Date: 08/31/1999
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Ozluturk, Fatih M., Kiernan, Brian
• Primary Examiner(s): Pezzlo, John
• Assistant Examiner(s): Elallam, Ahmed
• Application Number:
  US10/090,497
• Publication Number:
  US 20020080733A1
• Time in Patent Office: 1,233 Days
• Field of Search: 370/315, 370/342, 370/441, 455/108, 455/116, 455/126, 455/127.2, 455/561, 375/297, 375/130, 375/141, 375/144, 375/146
• US Class Current: 370/342
• CPC Class Codes: H03G 11/04 Limiting level dependent on strength of signal; Limiting level dependent on strength of carrier on which signal is modulated H03G11/008 takes precedence
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 2201/70706 with means for reducing the peak-to-average power ratio
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/225 Calculation of statistics, e.g. average, variance
• CPC Class Codes: H04W 52/343 taking into account loading or congestion level
• CPC Class Codes: H04W 52/346 distributing total power among users or channels
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A user equipment (UE) for transmitting signals employing a CDMA technique comprises means for combining a plurality of spread spectrum data signals; means for measuring a characteristic of the output of the combining means for a given time period; and means for adaptively limiting an output of the combining means responsive at least partially to an output of the measuring means.

Claims

1. A user equipment (UE) for transmitting signals employing a CDMA technique, comprising:

means for combining a plurality of spread spectrum data signals;

means for measuring a characteristic of an first output of said combining means for a given time period; and

means for adaptively limiting the first output of said combining means responsive at least partially to a second output of said measuring means;

wherein said measuring means has processing means for determining a standard deviation of said output and said adaptive limiting means limits said output to a given power level based in part on the determined standard deviation and said processing means disables said adaptive limiting means during transmission of short codes.

2. The UE of claim 1 wherein a calculated power level is twice as great as a standard deviation.

3. The UE of claim 1 wherein a calculated power level is at least one standard deviation.

4. The UE of claim 1 wherein said processing mean disables said adaptive limiting means when a number of active users reaches a given value.

5. The UE of claim 1 further comprising a modulator for modulating said first output to produce an RF signal and an amplifier for amplifying the RF signal prior to transmission, said measuring means determining a power level of said first output;

wherein a gain of said amplifier is adjusted by a processing means in response to a calculated power level and stored gain characteristics of said amplifier.