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Complex signal scaling for phase and/or amplitude modulated signals

A technology of amplitude modulation signal and signal, applied in the field of signal calibration, which can solve the problems of low precision and high complexity

Inactive Publication Date: 2007-07-04
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, these devices may exhibit lower precision, which is not satisfactory, or, in terms of architecture, chip size and / or degree of computation, higher complexity

Method used

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  • Complex signal scaling for phase and/or amplitude modulated signals
  • Complex signal scaling for phase and/or amplitude modulated signals
  • Complex signal scaling for phase and/or amplitude modulated signals

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Embodiment Construction

[0024] The drawings serve not only for a clear understanding of the invention but also, if necessary, for its description.

[0025] As schematically shown in FIG. 1 , the transmission path of a wireless communication device mainly includes a digital baseband processor (or device) BBD, a baseband and audio interface device BAI, a radio frequency (RF) device RFD, and a power amplifier PA.

[0026] In the following description, the wireless communication device will be considered to be a mobile phone, eg a GSM / GPRS mobile phone or a UMTS mobile phone, for transmitting (and receiving) phase and / or amplitude modulated signals. But the invention is not limited to this type of device. It may also be eg a laptop or a PDA (Personal Digital Assistant) comprising a communication device.

[0027] For the transmit direction, the digital baseband processor mainly includes a digital signal processor (DSP) and a controller device (for example, ARM) interfaced with the baseband and audio inte...

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Abstract

A signal scaling device (D), for a transmission path of a wireless communication equipment, comprises a processing means (PM) adapted to receive a phase and / or amplitude modulated signal (I / Q) to transmit, and arranged to multiply said phase and / or amplitude modulated signal with a chosen complex gain in order to output said phase and / or amplitude modulated signal with a chosen scaled amplitude and a chosen phase offset.

Description

technical field [0001] The present invention relates to transmit paths (or portions) of wireless communication devices using phase and / or amplitude modulated signals, and more particularly to signal scaling in such devices. Background technique [0002] Those skilled in the art know that the transmission path of some wireless communication devices (for example, GSM or UMTS mobile phones) includes a signal scaling device to change the gain of the transmitted signal. The signal scaling device can be arranged in analog and / or digital components of the transmit path. [0003] Many signal scaling devices have been proposed which are adapted for gain changes in the digital domain. They are mostly multipliers that perform binary multiplication of a digital signal and a selected gain by a "shift-add-store" procedure. Others are based on lookup tables that store and select all possible precomputed values ​​based on the selected address. Some of these devices implement algorithms b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/36
CPCH04L27/366H04L27/36
Inventor P·博德A·兰珀M·赫尔芬施泰因
Owner NXP BV