Method for amplitude-limited wide-band radio signal and relative transmitter

A broadband signal and transmitter technology, which is applied in the direction of radio/inductive link selection arrangement, limiting amplitude, adding and generating signals, etc., to achieve the effects of increasing system capacity, reducing costs, and increasing output power

Inactive Publication Date: 2002-07-17
ALCATEL LUCENT SAS
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  • Abstract
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  • Claims
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Problems solved by technology

[0009] Furthermore, an acceptable power amplifier efficiency is provided only at the expense of enormous processing power, not compatible with usual computing power

Method used

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  • Method for amplitude-limited wide-band radio signal and relative transmitter
  • Method for amplitude-limited wide-band radio signal and relative transmitter
  • Method for amplitude-limited wide-band radio signal and relative transmitter

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Embodiment Construction

[0026] According to the present invention, the proposed limiting module eliminates signal overflow above a predetermined threshold, that is, it generates filter pulses that are in phase with the limited signal. Each filter pulse corresponds to an overflow, and the amplitude of each filter pulse is dependent on The magnitude of the corresponding overflow.

[0027] -Figure 1 shows an embodiment of the limiting module according to the invention. The limiting module 10 includes a signal envelope detector 11, an overflow detector 12, an overflow selector 13, a pulse sequence generator 14, a low-pass filter 15 and a subtractor 16. The limiter module receives the baseband signal as input, and the baseband signal is composed of the in-phase part input I and the quadrature part input Q. Preferably, the baseband signal is represented in digital form so that the limiting module 10 performs digital processing.

[0028] The in-phase input I and the quadrature input Q part of the signal are con...

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PUM

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Abstract

The invention relates notably to a method for clipping a wideband signal in order to eliminate signal overshots having an amplitude above a predefined threshold before submitting the wideband signal to a power amplifier. According to the invention, the method comprises the steps of: i. subtracting from the wideband signal filtered pulses in phase the said wideband signal, each filtered pulse corresponding to an overshot, the amplitude of each filtered pulse being dependent on the amplitude of the corresponding overshot and on the predefined threshold. ii. repeating at least two successive iterations of step i on said wideband signal.

Description

Technical field [0001] The invention relates to broadband signal transmission through a radio interface. Background technique [0002] Usually, the transmission link of the radio communication network includes a power amplifier to amplify the signal before transmission through the radio interface. [0003] On the one hand, the peak-to-average ratio (PAR) is an important characteristic of the signal submitted to the power amplifier. The peak to average ratio is defined by the ratio between the highest amplitude of the signal and the average amplitude of the signal. The information superimposed wideband signal transmitted by several users using spread spectrum technology (such as CDMA signal) presents a neighboring Gaussian frequency distribution with a strict spectrum mask, and the wide dynamic envelope modulation results in a high peak-to-average ratio (PAR About 10dB). [0004] On the other hand, a power amplifier is usually characterized by its efficiency defined as the ratio b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G11/00H04J13/00H03F1/32
CPCH03F2201/3236H03F1/3247H03F2200/102
Inventor 卢克·达托伊斯
Owner ALCATEL LUCENT SAS
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