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Receiving machine frequency response recognition method, apparatus and compensating method

A technology of frequency response and identification method, which is applied in the field of communication, can solve the problem that the digital baseband cannot distinguish the relative proportion of nonlinear damage and linear response, etc., and achieve the effect of reducing the difference, ensuring the consistency of performance, and improving the maximum signal-to-noise ratio

Inactive Publication Date: 2009-02-11
ST ERICSSON SEMICON BEIJING
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Problems solved by technology

In the usual calibration, only the automatic gain control (AGC), automatic power control (APC) and automatic frequency control (AFC) are calibrated, even in the array antenna calibration, only the relative amplitude and phase without individually identifying and calibrating the frequency response characteristics of each receive channel
[0003] On the other hand, even if the error vector magnitude (EVM) performance of the receiver is basically the same, the digital baseband cannot distinguish the relative weight of the nonlinear impairment and the linear response

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  • Receiving machine frequency response recognition method, apparatus and compensating method
  • Receiving machine frequency response recognition method, apparatus and compensating method
  • Receiving machine frequency response recognition method, apparatus and compensating method

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[0044] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] First introduce the structure of the calibration frame adopted in the embodiment of the present invention, refer to figure 1 , the calibration frame includes complex sine (complex sine) time slots, PN (pseudorandom noise) time slots, probing OFDM (orthogonal frequency division multiplexing) time slots and multiple guard time slots (GP). The following specific numerical parameters are a typical configuration, and different applications can flexibly adjust the parameters in the calibration frame according to requirements.

[0046] After the signal generator is triggered, the calibration frame is sent cyclically within a certain time interval (for example, 100ms). The sampling frequency of the digital baseband of the receiver is set to 5.12MHz, ...

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Abstract

The invention provides a recognition method for the frequency response of a receiver, and a device and a compensating method thereof. The recognition method comprises the following steps: firstly, a receiver receives calibration frames cyclically sent by a signal generator, and each calibration frame comprises a re-sinusoidal time slot, a PN time slot, a detection OFDM time slot and a plurality of protection time slots; secondly, nolinear damage estimation and coarse synchronizing estimation are performed according to the re-sinusoidal time slot in the calibration frame, and the nolinear damage is compensated; thirdly, precise synchronizing estimation is performed according to the coarse synchronizing estimation result and the PN time slot in the calibration frame; fourthly, after precise synchronizing, the recognition of linear response is carried out according to the detection OFDM time slot in the calibration frame after nolinear damage estimation. According to the invention, the channel frequency response of the receiver can be effectively recognized, and the frequency response can be compensated, so as to increase the maximum signal to noise ratio of the signal in the pass band of the receiver, so that the receiver performance can be enhanced equivalently.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to an identification method, device and compensation method of a receiver frequency response. Background technique [0002] On the one hand, for a wireless receiver, the performance of the receiver directly determines the best performance of the wireless link, and there are obvious differences in the performance of different radio frequency (RF) chips. In the usual calibration, only the automatic gain control (AGC), automatic power control (APC) and automatic frequency control (AFC) are calibrated, even in the array antenna calibration, only the relative amplitude and phase without individually identifying and calibrating the frequency response characteristics of each receive channel. [0003] On the other hand, even if the error vector magnitude (EVM) performance of the receiver is basically the same, the digital baseband cannot distinguish the relative proportio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 何林
Owner ST ERICSSON SEMICON BEIJING
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