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OFDM receiver and frequency response equalization method thereof

A frequency response and receiver technology, applied in the field of signal processing, can solve problems such as excessive computing overhead, and achieve the effect of reducing dynamic changes

Pending Publication Date: 2017-05-24
XINGTERA SEMICON TECH (SHANGHAI) CO LTD
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AI Technical Summary

Problems solved by technology

In order to increase the accuracy and quality of format conversion, fixed-point arithmetic is designed to use many bits, and the operation overhead is too large

Method used

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  • OFDM receiver and frequency response equalization method thereof
  • OFDM receiver and frequency response equalization method thereof
  • OFDM receiver and frequency response equalization method thereof

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Embodiment Construction

[0022] The advantages of the present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0023] refer to image 3 , is a schematic structural diagram of an OFDM receiver conforming to a preferred embodiment of the present invention. In the present invention, the OFDM receiver includes a fast Fourier transform module for performing Fourier transform on the channel and a constellation demapping module for constellation diagram mapping, in order to perform bit width compression on the frequency response output by the fast Fourier transform module , there is also a channel compression module between the above two modules. As the name suggests, the Channel Compression module will "compress" the frequency response bit width. Specifically, the fast Fourier transform module outputs the frequency response to the channel compression module. After the channel compression module receives the frequency response, it performs...

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Abstract

The invention provides an OFDM receiver comprising a fast Fourier transform calculation module and a constellation de-mapping module. The OFDM receiver also comprises a channel compression module which is arranged between the output end of the fast Fourier transform calculation module and the input end of the constellation de-mapping module. The channel compression module performs planarization on the frequency response outputted by the fast Fourier transform module according to block floating point calculation and outputs the frequency response after planarization to the constellation de-mapping module. The invention also discloses a frequency response equalization method of the OFDM. With application of the technical scheme, the process of frequency response planarization can be completed through a small amount of system overhead.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to an OFDM receiver and its frequency response equalization method. Background technique [0002] The frequency response of many communication channels is extremely uneven. refer to figure 1 , is a schematic diagram of the dynamic range of a common frequency response. In this example, the dynamic range of the frequency response is greater than 25dB. Because communication channels are often disturbed by filtering, multipath propagation, signal reflections, etc., their frequency response becomes uneven. [0003] Therefore, for the processing of the frequency response, fixed-point operations, block floating-point operations or a combination of both are used in the prior art. refer to figure 2 , is a schematic diagram of the OFDM transmitter and receiver system. For example, the fast Fourier transform is a block floating-point operation, and the constellation demapper is a fixed-po...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 阿尔韦托·希门尼斯·菲尔茨特罗姆亚历杭德罗·马特奥斯·奥特斯
Owner XINGTERA SEMICON TECH (SHANGHAI) CO LTD
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