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Controlling multiple modems in a wireless terminal using dynamically varying modem transmit power limits

A technology of modem and transmission power, which is applied in the field of mobile wireless terminals, and can solve problems such as unwanted distortion of RF output signals

Inactive Publication Date: 2006-01-11
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Excessive input power can overdrive the PA, causing the output power to exceed the PA's acceptable operating transmit power limit
This in turn can cause undesired distortion of the RF output signal, including unacceptable out-of-band RF emissions

Method used

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  • Controlling multiple modems in a wireless terminal using dynamically varying modem transmit power limits
  • Controlling multiple modems in a wireless terminal using dynamically varying modem transmit power limits
  • Controlling multiple modems in a wireless terminal using dynamically varying modem transmit power limits

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Embodiment Construction

[0042] A variety of multiple-access communication systems and techniques have been developed for transferring information among a large number of system users. However, spread spectrum modulation techniques, such as those used in Code Division Multiple Access (CDMA) communication systems, offer significant advantages over other modulation schemes, especially when servicing large numbers of communication system users. This technique is disclosed in the principles of U.S. Patent Nos. 4,901,307 and 5,691,174, the former patent issued on February 13, 1990, entitled "Spread Spectrum Multiple Access Communication System Using Satellite or Terrestrial Repeaters", the latter patent issued in 1997 Published November 25, entitled "Method and Apparatus for Using Full Spectrum Transmitted Power in a Spread Spectrum Communication System for Tracking Individual Recipient Phase Time and Energy," both assigned to the assignee of the present invention and incorporated by reference fully integr...

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Abstract

A mobile wireless terminal (MWT) includes multiple wireless modems. The multiple modems have their respective transmit outputs combined together to produce an aggregate transmit output. The multiple modems can concurrently transmit data in a reverse link direction and receive data in a forward link direction. The MWT is constrained to operate under an aggregate transmit power limit. Each of the multiple modems has an individual transmit limit related to the aggregate transmit power limit. An MWT controller adjusts the individual transmit power limits in the multiple modems based on an aggregate transmit power limit of the MWT and respective transmit power estimates from the modems, to cause each individual transmit power limit to track a corresponding individual modem transmit power.

Description

Background of the invention [0001] I.Technical field [0002] The present invention relates generally to mobile radio terminals, and more particularly to mobile radio terminals having a plurality of modems constrained to operate within the aggregate transmit power limit of all modems. [0003] II. Background technology [0004] In a data call established between a mobile wireless terminal (mwt) and a remote station, the mwt can send data to the remote station over a "reverse" communication link. Likewise, MWT can receive data from remote stations via a "forward" communication link. There is an urgent need to increase the transmit and receive bandwidth, ie, data rate, available on both the forward and reverse links. [0005] In general, an MWT includes a transmit power amplifier for power amplification of a radio frequency (rf) input signal. The power amplifier produces an amplified radio frequency output signal having an output power responsive to the input power of the in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H04L12/28H04W52/30H04W52/34H04W52/36H04W52/52
CPCH04W52/30H04W52/36H04W52/34H04W52/52
Inventor F·M·奈A·霍尔米D·吉瑞切特J·J·安德森W·R·潘顿
Owner QUALCOMM INC