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Method and apparatus for reducing transmitter peak power requirements using dual matrices

A peak power, transmitter technology, applied in the field of communication systems, can solve problems such as expensive, no known technology, difficult to build linear PA, etc.

Inactive Publication Date: 2008-12-03
GOOGLE TECHNOLOGY HOLDINGS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Linear PAs are hard to build and very expensive
Limiting the range of output and thus input signals over which the amplifier must demonstrate a degree of linearity over these signals can dictate or involve cost and difficulty
In conventional amplifier systems there are known techniques for manipulating the input signal to help with these purposes, but not when working with FTMs

Method used

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  • Method and apparatus for reducing transmitter peak power requirements using dual matrices
  • Method and apparatus for reducing transmitter peak power requirements using dual matrices
  • Method and apparatus for reducing transmitter peak power requirements using dual matrices

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Embodiment Construction

[0016] This disclosure relates, by way of overview, to communication systems utilizing transmitters to provide services to communication units, and more specifically to users operating therein. More particularly, various inventive concepts and principles embodied in methods and apparatus for reducing transmitter peak power requirements are discussed and disclosed. Communication systems of particular interest are those deployed and developed such as GSM, GPRS, EDGE, TETRA, iDEN, CDMA, W-CDMA, CDMA2000, 2.5G or 3G systems, or their variants and evolutions that require cost effective high availability linear transmitters.

[0017] As discussed further below, various inventive principles and combinations thereof are advantageously used to construct and process signals that the amplifier will encounter essentially at baseband, whereby assuming these principles or their equivalents are used, then in Various problems associated with known systems are mitigated while still facilitati...

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PUM

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Abstract

An apparatus and method thereof for processing base band signals to reduce peak power requirements for a multi-channel transmitter (200) is disclosed. The apparatus includes a first Fourier Transform Matrix (FTM) (203) coupled to one or more input signals (217-220) for providing a plurality of output signals (221-224) each comprising a combination of phase shifted versions of the input signals; a processing unit (205) for limiting a peak value for each of the output signals to provide a plurality of peak limited output signals (225-228), and a second FTM (207) for decomposing the peak limited output signals to provide one or more output base band signals (229-232) suitable for generating one or more low level signals for driving the multi-channel transmitter, each of the output base band signals corresponding to one of the input signals.

Description

technical field [0001] The present invention relates generally to communication systems, and more particularly to methods and apparatus for reducing the peak power requirements of transmitters in such systems using transform matrices. Background technique [0002] Communication systems, especially wireless communication systems, require transmitters of one form or another. From a power standpoint, transmitters, especially higher power transmitters, especially power amplifiers (PAs), are among the more expensive and stressful components of a communication system. For example, taking advantage of the relatively close coupling of PAs to antenna systems, they are often abused due to antenna irregularities such as mismatches and weather or lightning events. For these reasons, transmitters or power amplifiers experience or often suffer a relatively higher failure rate than some system components. These high powered transmitters are typically found in base stations. Base station...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/60H04L5/06H04L27/26
CPCH04L27/2614H04L5/06H04L25/03H03F3/60
Inventor 罗纳德·L.·朴库威廉·C.·格林伍德格伦·A.·弗兰森
Owner GOOGLE TECHNOLOGY HOLDINGS LLC