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Communication device and method of crest factor reduction using amplitude compression

A crest factor, communication device technology, applied in digital transmission system, modulated carrier system, improved amplifier to reduce nonlinear distortion, etc., can solve the problem of low efficiency of power amplifier, difficulty in completely correcting amplitude distortion of transmission signal by digital pre-distortion module, IMD beyond

Inactive Publication Date: 2015-05-27
MICROELECTRONICS TECH INC
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Problems solved by technology

However, if the peak amplitude of the signal reaches the saturation power level, the transmission signal will be affected by distortion, which may cause higher internal intermodulation distortion (Inter-Modulation Distortion, IMD) as the distortion continues to accumulate, making the digital pre- It is difficult for the distortion module to completely correct the amplitude distortion in the transmitted signal, which may cause IMD to exceed the range allowed by the spectrum emission mask
[0004] In order to avoid the above situation, it is possible to transmit the signal at less than the saturation power, but this way of transmitting the signal will cause the power amplifier to be inefficient

Method used

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  • Communication device and method of crest factor reduction using amplitude compression
  • Communication device and method of crest factor reduction using amplitude compression
  • Communication device and method of crest factor reduction using amplitude compression

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Embodiment Construction

[0067] A communication device includes a multi-carrier power amplifier (Multi Carrier Power Amplifier, MCPA) transmission system, and the crest factor reduction (Crest Factor Reduction, CFR) method of the present invention is a method for compressing the peak amplitude of a signal in a CFR processing unit. The embodiment of the present invention gives an example of reducing the crest factor by compressing the peak amplitude of the signal in the communication device with the MCPA transmission system. The communication device with the MCPA transmission system disclosed in the embodiment can be an independent device or integrated into various network gateway devices or network terminal equipment. Various network gateway devices include base stations, routers, switches, hotspots, or hubs in a wireless network. Network terminal equipment includes set-top boxes, mobile phones, personal tablet computers, desktop computers, media players, digital cameras, personal digital assistants, ...

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Abstract

A method of crest factor reduction using amplitude compression for multi carrier signals. Major elements of the inter-modulation distortion caused by amplitude suppression are removed to be outside of the desired signal band, and the peak amplitude is compressed, thus producing a signal with lower peak to average ratio for a required maximum error vector magnitude.

Description

technical field [0001] The invention relates to a signal processing system, in particular to a communication device and a method for reducing crest factor. Background technique [0002] In existing communication systems, broadband transmission waveforms containing multiple carriers or subcarriers are used, and these transmission waveforms are non-constant amplitude waveforms, and fast amplitude can be achieved in waveforms whose peak amplitude is substantially larger than the root mean square amplitude Variety. While maintaining a certain signal quality and high power in adjacent channels to meet the requirements of the spectrum emission template, multi-carrier signals are efficiently transmitted through a multi-carrier power amplifier. [0003] In order to achieve the maximum efficiency of the power amplifier, it is ideal to transmit the signal in a way close to the saturation power. However, if the peak amplitude of the signal reaches the saturation power level, the tran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32H04B1/10H04L27/26
CPCH04L27/2624
Inventor 该谦
Owner MICROELECTRONICS TECH INC
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