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Polar modulation apparatus and method using FM modulation

A polar modulation and equipment technology, applied in the direction of modulation, angle modulation, modulation carrier system, etc., can solve the problem of increasing EVM

Inactive Publication Date: 2011-04-27
ST ERICSSON SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the digital domain, this will cause additional aliasing, which in turn increases the EVM

Method used

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  • Polar modulation apparatus and method using FM modulation
  • Polar modulation apparatus and method using FM modulation
  • Polar modulation apparatus and method using FM modulation

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Embodiment Construction

[0017] The preferred embodiment will now be described in connection with a polar modulator device utilizing a wireless network such as Bluetooth, UWB (Ultra Wideband), WLAN (Wireless Local Area Network) or GSM EDGE (Enhanced Data Rates for GSM Evolution). IQ modules in wireless communication systems.

[0018] Fig. 1 shows a schematic block diagram of the proposed polar modulator circuit, in which a digital baseband circuit 10 is provided for generating an in-phase (I) signal and a quadrature-phase (Q) signal or components of an input signal. The I and Q signals are provided to a frequency modulation (FM) modulator circuit 20 which generates a frequency converted analog signal corresponding to the frequency content of the baseband signal reflected by the I and Q components. The resulting frequency-converted signal is taken as the derivative of the phase obtained from the baseband signal. An analog output signal corresponding to this derivative is supplied to a voltage-controll...

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Abstract

The present invention relates to a polar modulation apparatus and method, in which an in-phase and a quadrature-phase signal are processed in the analog domain to generate an analog signal corresponding to a derivative of a phase component of said polar- modulated signal. The analog signal is then input to a control input of a controlled oscillator (40). As an example, the processing may be basedon a differentiate - and - multiply algorithm in the analog domain. Thereby, phase and envelope signals are generated in the analog domain and bandwidth enlargement due to the processing of the polarsignals and corresponding aliasing can be prevented to obtain a highly accurate polar-modulated output signal.

Description

Background technique [0001] Linearity and power efficiency are important requirements in current power amplifier (PA) designs. In practice, the design space of a PA consists of several parameters such as compression point, output power, effective gain or accuracy that affect the linearity and efficiency requirements, which can be represented by the error vector magnitude (EVM). It is difficult to find an optimally designed amplifier because there is a trade-off between these parameters, so they cannot be optimized simultaneously. For example, efficiency and linearity requirements are two conflicting requirements. Theoretically, for high power levels, increased linearity results in decreased power efficiency, and on the other hand, for low power levels, increased efficiency results in poorer linearity. For wireless communication systems with amplitude and phase modulation (eg, quadrature amplitude modulation (QAM)), the above problems become even more demanding. Especially f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03C3/09H03C5/00H04L27/34
CPCH03C3/095H03C3/0941H03C3/0975H04L27/361H03C5/00
Inventor 保罗·马泰耶森多米尼克斯·M·W·利纳尔特斯
Owner ST ERICSSON SA