A data compression method and system

Abstract

The invention provides a data compression method and a system, and is used for simplifying a data compression process and improving the data compression rate. The method comprises the following steps of: sampling data in an orthogonal frequency division multiplexing signal; combining M sampling point data into a child window; combining N child windows into a composite window; by aiming at the current composite window, respectively calculating the static information of each child window in the current composite window and the static information of the current composite window; according to the static information of each child window and the static information of the current composite window, calculating the automatic gain control factor of the composite window; carrying out automatic gain control operation to the sampling point data in the composite window by utilizing the automatic gain control factor; determining the value of the parameter in compression operation; according to the value of the parameter, carrying out the compression operation to the data subjected to the automatic gain control operation in the composite window; and splicing the compression data subjected to the compression operation with the control parameter of the composite window into a compressed transmission unit.

Description

technical field [0001] The present application relates to the technical field of communications, and in particular to a data compression method and system. Background technique [0002] With the rapid development of the TD-LTE (TimeDivision-LongTermEvolution, time-division long-term evolution) industry, how to smoothly evolve to TD-LTE is the key to faster and better deployment of TD-LTE network. [0003] IR (synonymous with "Interface between the RRU and the BBU") interface rate compression is a key technology in the evolution process, and IR data compression has significant value for TD-SCDMA network upgrade. IR data compression can realize the smooth evolution of the network by using the IR transmission capability of existing 3G equipment without compromising the performance index, which not only saves the cost of adding or replacing higher-rate optical modules, but also effectively reduces cost of engineering renovations. [0004] At present, the industry generally ad...

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Problems solved by technology

[0009] In the above-mentioned A-law compression method, it is required to select the boundary of the entire Orthogonal Frequency Division Multiplexing Symbol (OFDMSymbol) for the starting position of the buffer depth. Since the OFDMSymbol boundary is related to the frame format information of LTE, the system's uplink and downlink bandwidth, CP ( CyclicPrefix, cyclic prefix) type, OFDMSymbol index number, etc. will all have an impact on buffer control, resulting in more complicated buffer control during data compression

In addition, in order to balance the delay caused by the buffer depth and the accuracy of AGC calculation, the depth selection of 1 / 4~1 / 2Symbol is mostly used. In the broadband configuration (such as 20M) scenario, a large storage space is still required, which is very difficult for the implementation cause a relatively large storage burden

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