CROSS-REFERENCE TO RELATED APPLICATION

This application is a 371 of International Application No. PCT/KR2018/014292 filed on Nov. 20, 2018, the disclosure of which is herein incorporated by reference in its entirety.

BACKGROUND

1. Field

The present disclosure relates to a data processing technology in the field of wireless communication, and more particularly relates to a method, device and system for data compression and decompression.

2. Description of Related Art

The modern wireless communication system adopts a common public radio interface (CPRI) protocol and transmits data by optical fibers. In the current high-speed and wide-broadband era, as increasing of the demand for data transmission in the wireless communication system, it is required to find a method to reduce the demand for high-speed optical fibers for data transmission, and the compression for transmitted data is an important method.

At present, the method for data compression in the wireless communication system is to carry out lossy compression on transmitted data simply. Specifically, the data to be transmitted are directly compressed in the time domain, and then the data compressed in the time domain are transmitted by the CPRI protocol, or the data are transformed to the frequency domain to be compressed, and the data compressed in the frequency domain are transmitted by the CPRI protocol. However, more serious signal noise ratio loss (SNR Loss) of the data transmitted by low power users will be caused by noises brought by using the compression manners above. Therefore, how to reduce the influence of the lossy compression on the data transmitted by low power users on the premise of ensuring an overall data compression ratio, overall mean square error (MSE) or error vector magnitude (EVM) during data transmission in wireless communication system becomes an urgently problem to be solved.

SUMMARY

The embodiments of the present disclosure are implemented as follows.

A method for data compression, comprising:

converting data to be transmitted within each period, from the time domain to the frequency domain, wherein, a default time length is set as a period;

identifying weak power frequencies in the frequency domain data according to a set identification rule;

weighting data transmitted on the identified weak power frequencies to obtain corresponding weighting information;

converting other data converted to the frequency domain and the weighted data back to the time domain;

compressing the data converted back to the time domain; and

transmitting the compressed data along with the weighting information.

The range of the weighting refers to a plurality of sampling points, a symbol, a time slot or a subframe.

The data transmission is through the CPRI protocol.

The identification rule is a rough identification rule, wherein, the rough identification rule comprises: power values of a plurality of consecutive frequency points of a set number are compared, the maximum power is set as a standard, the standard is minified to a set multiple to serve as a threshold, the power values of the multiple frequency points is compared with the threshold, and the frequencies with the power less than the threshold are taken as the weak power frequencies.

The identification rule is a fine identification rule, wherein, the fine identification rule comprises: a set number of consecutive multiple frequency points are set as a frequency point set, the consecutive multiple frequency points of the consecutive time domain are taken as multiple group frequency sets, the consecutive multiple group frequency sets are compared, the maximum power of each frequency of the consecutive multiple frequency points is acquired, the maximum of the maximum power of each frequency of the consecutive multiple frequency points is taken as a standard, the standard is minified to a set multiple to serve as a threshold, the threshold is compared with the frequency power of the subsequent frequency sets, and frequencies with the power less than the threshold in the subsequent frequency sets are taken as the weak power frequencies.

The weighting information is identifiers of the weak power frequencies.

The weighting information is transmitted through idle time-domain signal resources within the period, or transmitted through occupying time-domain signal resources for transmitting data within the period.

The method of claim1is re-executed within each period or within every other set period.

A method for data decompression, comprising:

receiving compressed data and weighting information transmitted in the time domain;

decompressing the compressed data in the time domain;

converting data to be transmitted within each period from the time domain to the frequency domain, wherein, a default time length is set as a period;

unweighting the data transmitted on the identified weak power frequencies, after identifying the weak power frequencies according to the weighting information; and

converting other data converted to the frequency domain and the unweighted data back to the time domain to finish receiving of the transmitted data.

The weighting information is identifiers of the weak power frequencies; and the unweighting is performed according to a set weighted value.

A device for data compression, comprising: a time-frequency converting unit, a frequency-domain weighting unit, a compression unit and a transmission unit, wherein,

the time-frequency converting unit, is to convert the data to be transmitted within each period from the time domain to the frequency domain, wherein, a default time length is set as a period; and convert other data converted to the frequency domain and the weighted data back to the time domain;

the frequency-domain weighting unit is to identify weak power frequencies in the frequency domain data according to a set identification rule, and weight the data transmitted on the identified weak power frequencies;

the compression unit is to compress the data converted back to the time domain; and

the transmission unit is to transmit the compressed data along with the weighting information.

A device for data decompression, comprising: a receiving unit, a decompression unit, a time-frequency converting unit and a frequency-domain unweighting unit, wherein,

the receiving unit is to receive compressed data and weighting information transmitted in the time domain;

the decompression unit is to decompress compressed data in the time domain;

the time-frequency converting unit is to convert the data to be transmitted within each period from the time domain to the frequency domain, wherein, a default time length is set as a period, and convert other data converted to the frequency domain and the unweighting data back to the time domain; and

the frequency-domain unweighting unit is to unweight the data transmitted on the identified weak power frequencies, after identifying the weak power frequencies according to the weighting information.

A system for data compression and decompression, comprising transmitter device and receiver device, wherein,

the transmitter device is to convert data to be transmitted within each period from the time domain to the frequency domain, wherein, a default time length is set as a period; identify weak power frequencies in the frequency domain data according to a set identification rule; weight data transmitted on the identified weak power frequencies to obtain corresponding weighting information; convert other data converted to the frequency domain and the weighted data back to the time domain; compress the data converted back to the time domain; and transmit the compressed data along with the weighting information to the receiver device; and

the receiver device is to receive compressed data and weighting information transmitted in the time domain; decompress the compressed data in the time domain; convert data to be transmitted within each period from the time domain to the frequency domain, wherein, a default time length is set as a period; unweight the data transmitted on the identified weak power frequencies, after identifying the weak power frequencies according to the weighting information; and convert other data converted to the frequency domain and the unweighted data back to the time domain As mentioned above, according to embodiments of the present disclosure, data to be transmitted within each period is converted from the time domain to the frequency domain, wherein, a default time length is set as a period; weak power frequencies in the frequency domain data are identified according to a set identification rule; data transmitted on the identified weak power frequencies is weighted; other data converted to the frequency domain and the weighted data is converted back to the time domain; the data converted back to the time domain is compressed; and the compressed data along with the weighting information is transmitted to the receiver. At the receiver, compressed data and weighting information transmitted in the time domain is received; the compressed data in the time domain is decompressed; data to be transmitted within each period is converted from the time domain to the frequency domain, wherein, a default time length is set as a period; the data transmitted on the identified weak power frequencies is unweighted, after identifying the weak power frequencies according to the weighting information; and other data converted to the frequency domain and the unweighted data is converted back to the time domain. According to the methods devices and system provided by the embodiments of the present disclosure, the data transmitted on the weak power frequencies are weighted, so the loss in a lossy compression transmission process is low, receiver may receive data correctly, and the influence on compression ratio of the overall data will be small, and accordingly the influence of the lossy compression on the data transmitted by weak power users is reduced on the premise of ensuring the compression ratio of the overall data, overall MSE or EVM.

An embodiment of the present disclosure provides a method for data compression, which may reduce the influence of the lossy compression on the data transmitted by low power users on the premise of ensuring the compression ratio of the overall data, overall MSE or EVM.

An embodiment of the present disclosure provides a method for data decompression, which may reduce the influence of the lossy compression on the data transmitted by low power users on the premise of ensuring the compression ratio of the overall data, overall MSE or EVM.

An embodiment of the present disclosure provides a device for data compression, which may reduce the influence of the lossy compression on the data transmitted by low power users on the premise of ensuring the compression ratio of the overall data, overall MSE or EVM.

An embodiment of the present disclosure provides a device for data decompression, which may reduce the influence of the lossy compression on the data transmitted by low power users on the premise of ensuring the compression ratio of the overall data, overall MSE or EVM.

An embodiment of the present disclosure provides a system for data compression and decompression, which may reduce the influence of the lossy compression on the data transmitted by low power users on the premise of ensuring the compression ratio of the overall data, overall MSE or EVM.

