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A signal processing method, device and system

A signal processing device and signal technology, applied in the field of communication, can solve the problems of limiting the working efficiency of the whole machine, affecting the digital pre-distortion, failing to reach the efficiency of the whole machine, etc., achieving good ability, suppressing peak regeneration, and accurate peak position Effect

Active Publication Date: 2017-08-11
COMBA TELECOM SYST CHINA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A higher peak-to-average ratio of the signal will lead to: 1. The peak fallback caused by the peak-to-average ratio of the signal directly affects the efficiency of the power amplifier, thereby reducing the efficiency of the whole machine
2. The signal peak-to-average ratio will also affect the performance of digital pre-distortion (DPD, Digital Pre-Distortion), further limiting the working efficiency of the whole machine
Due to the low sampling rate of the baseband signal in the peak clipping processing of the baseband signal, and in the current 3G system and LTE system, the bandwidth of the baseband signal is relatively wide, so that after clipping the baseband signal according to the peak clipping threshold , in the subsequent frequency conversion or digital-to-analog conversion processing, the peak regeneration phenomenon of the signal is very serious, which seriously deteriorates the PAPR and complementary cumulative distribution function (CCDF, Complementary Cumulative Distribution Function) of the signal, and greatly reduces the effect of peak clipping. To improve the efficiency of the whole machine

Method used

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  • A signal processing method, device and system
  • A signal processing method, device and system
  • A signal processing method, device and system

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Embodiment 1

[0029] Embodiment 1 of the present invention provides a signal processing device, the structure of which can be as follows figure 1 shown, including:

[0030] The interpolation filter unit 11 is used to perform the interpolation filter processing with an interpolation multiple of L times to the received baseband signal, and the L is a positive number greater than 1; the limiting and peak-cutting unit 12 is used to perform the interpolation filter processing on the interpolation filter unit The obtained signal is subjected to peak clipping processing; the decimation and filtering unit 13 is used to convert the sampling rate of the signal obtained after the peak clipping processing by the limiting and peak clipping unit to a first sampling rate.

[0031] The first sampling rate can be the sampling rate required by the subsequent processing, such as the first sampling rate is the sampling rate required by the digital-to-analog converter, or not the sampling rate required by the s...

Embodiment 2

[0043] Embodiment 2 of the present invention provides a signal processing method, and the step flow of the method can be as follows Figure 4 shown, including:

[0044] Step 101, perform interpolation filtering processing.

[0045] In this embodiment, after receiving the wideband baseband signal, the interpolation filtering unit may perform an interpolation filtering process with an interpolation multiple of L times on the baseband signal, where L is a positive number greater than 1. The interpolation multiple is generally selected according to specific needs. When the wideband baseband signal with a low sampling rate is interpolated to a higher sampling rate, the baseband signal becomes smoother in the time domain, and new peaks appear in the signal at the same time.

[0046] The schematic diagram of the signal processing process can be as follows Figure 5 as shown, Figure 5 Line 1 in represents the broadband baseband signal received by the interpolation filter unit, ...

Embodiment 3

[0061] Specifically, such as Figure 6 As shown, according to the existing technology, the long-term evolution (LTE) 20M broadband baseband signal (line 1) with a sampling rate of 30.72Msps is directly subjected to peak clipping processing, and its CCDF curve is line 2 after peak clipping. If the signal after peak clipping is interpolated to 245.76Msps, due to peak regeneration, as shown in line 3, the CCDF curve deteriorates seriously, and the PAPR of the signal deteriorates from 6.412db before interpolation to 7.689db.

[0062] And as Figure 7 As shown, using the scheme provided by the present invention, the broadband baseband signal (line 1) of LTE20M with a sampling rate of 30.72Msps is subjected to signal processing (interpolation filter processing, peak clipping processing and extraction filter processing in sequence), and the signal obtained after signal processing The CCDF curve (line 2 (solid line)) and the CCDF curve obtained by interpolating the signal obtained af...

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Abstract

Embodiments of the present invention provide a signal processing method, device, and system, which can obtain a baseband signal with a higher sampling rate through interpolation filtering when it is necessary to perform peak clipping on a wideband baseband signal at a lower sampling rate, so that The peak position of the signal is more accurate. By clipping the baseband signal with a higher sampling rate, the peak value can be accurately eliminated, the peak clipping effect can be improved, and the sampling rate of the signal after peak clipping processing can be converted to the first sampling rate, which is convenient for subsequent deal with. After the above processing, the signal amplitude of the subsequent frequency conversion or digital-to-analog conversion processing can be lower than that of the signal obtained by directly clipping the baseband signal for subsequent frequency conversion or digital-to-analog conversion processing. Small, in the subsequent frequency conversion or digital-to-analog conversion process, when interpolation and filtering operations are required, the possibility of peak regeneration is reduced, so that the signal has a good ability to suppress peak regeneration.

Description

technical field [0001] The present invention relates to the communication field, in particular to a signal processing method, device and system. Background technique [0002] With the continuous development of communication technology, the overall efficiency requirements of communication equipment are also getting higher and higher. At present, due to the use of technologies such as multi-user, multi-carrier, and high-order modulation, the signal often has a relatively high peak-to-average ratio (PAPR, Peak to Average Power Ratio). , Long TermEvolution) system is especially obvious. A higher peak-to-average ratio of the signal will lead to: 1. The peak fallback caused by the peak-to-average ratio of the signal directly affects the efficiency of the power amplifier, thereby reducing the efficiency of the whole machine. 2. The signal peak-to-average ratio will also affect the performance of digital pre-distortion (DPD, Digital Pre-Distortion), further limiting the working ef...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03
Inventor 黄嘉强
Owner COMBA TELECOM SYST CHINA LTD
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