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System and method for peak power reduction in spread spectrum communications systems

A technology of spread spectrum communication and communication system, which is applied in the field of cellular communication system and signal processing equipment, and can solve problems such as inability to work

Inactive Publication Date: 2003-06-18
INTEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thus, such an approach would not work in real world applications

Method used

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  • System and method for peak power reduction in spread spectrum communications systems
  • System and method for peak power reduction in spread spectrum communications systems
  • System and method for peak power reduction in spread spectrum communications systems

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Embodiment Construction

[0054] refer to Figure 6 , shows a preferred embodiment of a spread spectrum communication system employing peak power reduction according to the present invention. While the illustrated spread spectrum communication systems can be implemented in a wireless cellular network, such as a WCDMA or CDMA network, and these systems provide a preferred application of the present invention, it should be recognized that other applications and environments for the present invention are possible of.

[0055] As shown, a number N of channels are provided as data inputs into the system. A data channel may include audio data, for example in digital cellular applications, or may include any other form of data that is desired to be transmitted over the communication system. The data in each channel then passes through a data-to-symbol converter 100, which provides a stream of symbols from the incoming data bit stream. A wide variety of different symbol encoding schemes can be used to provi...

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Abstract

A system and method for signal peak reduction in a spread spectrum communication system of the type including a filter for limiting signal bandwidth of symbols transmitted from the system. A signal peak reduction unit is provided before the filter that includes a filter predictor that predicts the effect of the filter on input symbols by using filter coefficient values corresponding to the filter impulse response function. Input symbols that are predicted to cause the output signal to exceed a predetermined peak limit value are adjusted. Several examples of suitable algorithms for calculating the necessary peak reduction to be applied to the input symbols are disclosed. The peak reduction unit provides adjusted symbols to the filter for processing and communication system output.

Description

technical field [0001] The present invention relates to code division multiple access communication systems and related methods of operation. More particularly, the present invention relates to cellular communication systems and signal processing devices and methods employed in cellular communication systems. Background technique [0002] Wireless communication systems employing transmissions between a base station and multiple mobile users are key components of modern communication infrastructure. (For the sake of brevity and not to limit the term "cellular" to the particular type of communication system or the particular frequency band with which the term is sometimes associated, such wireless communication systems are referred to herein as "cellular" communication systems). These cellular systems are placed under ever-increasing performance requirements that place a burden on the available equipment, especially the capabilities of the cellular base station equipment. Th...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04L27/26H04L27/36
CPCH04L27/366H04L27/2614H04L25/03343H04B2201/70706H04L27/2621H04B1/707H04J13/10H04W52/36
Inventor M·J·亨顿
Owner INTEL CORP
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