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Method and apparatus for generating a carrier frequency signal

一种载频信号、频率信号的技术，应用在通信领域，能够解决限制调制带宽等问题，达到增加匹配度、增加精确性、快速信道跳频的效果

Active Publication Date: 2011-10-12
HUAWEI TECH CO LTD
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AI Technical Summary

Problems solved by technology

This creates a problem: when modulating the PLL directly, it limits the modulation bandwidth due to the low-pass filter it applies to the modulation

Method used

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  • Method and apparatus for generating a carrier frequency signal
  • Method and apparatus for generating a carrier frequency signal
  • Method and apparatus for generating a carrier frequency signal

Examples

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Embodiment Construction

[0054] To avoid the problem of low bandwidth, a two-point modulation structure can also be used, where the modulating signal is inserted at one point to modulate the output loop (PLL) and reversed into the loop feedback path so that no modulation occurs in the loop .

[0055] Refer below figure 1 An embodiment of the invention is described showing a method of generating a carrier frequency signal in a two-point modulation structure.

[0056] Step 101: Generate a first frequency signal.

[0057] The first frequency signal can be expressed as f 1 .

[0058] This embodiment may include generating the first frequency signal from a digital tuning word (DTW), or generating a first frequency signal from a tuning voltage (TV) (depending on whether a digitally controlled oscillator (DCO) or a voltage controlled oscillator (VCO) is used VCO)). DTW or TV is the output of the PLL.

[0059] Another problem encountered is that oscillator dragging and injection locking can cause spuri...

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PUM

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Abstract

A method and apparatus for generating a carrier frequency signal is disclosed. The method includes generating a first frequency signal; injecting a modulation signal at a first point of the two-point modulation architecture; 5 generating a second frequency signal from the modulation signal; introducing the second frequency signal by mixing the first frequency signal and the second frequency signal to generate a mixed frequency signal and outputting the carrier frequency signal selected from the mixed frequency signal.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and equipment for generating carrier frequency signals. Background technique [0002] Using the polar modulation structure, the phase modulation of the carrier is performed by a method of modulating a phase locked loop (Phase Locked Loop, PLL) in a frequency synthesizer used to generate the carrier. In order to minimize the noise from the PLL, its loop filter (loop filter, LPF) bandwidth is usually relatively small. The modulation bandwidth of modern wireless communication protocols (such as Wideband Code Division Multiple Access (WCDMA), Enhanced Data Rates for GSM Evolution (EDGE), and others) is usually larger than this bandwidth. Furthermore, the bandwidth required for phase modulation is approximately five times the modulation bandwidth. This creates a problem: when modulating the PLL directly, it limits the modulation bandwidth because it applies a low-pass filt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/04
CPCH04L27/0014H04L2027/0018H03C3/0908H04L27/361
Inventor 克里斯坦·哥如英安德斯·雅各布欧拉·派特森安德斯·艾莫瑞克李炳鑫
Owner HUAWEI TECH CO LTD
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