A kind of iq data compression method and system
A data compression and data technology, applied in digital transmission systems, transmission systems, electrical components, etc., can solve the problems of small signal compression loss, etc., and achieve the effects of low data error, high compression ratio, and low bit error rate
Inactive Publication Date: 2017-04-26
XI AN JIAOTONG UNIV
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[0008] This linear compression scheme is based on the maximum value of the modulus of the I-channel signal and the Q-channel signal in each group of data, and judges the shift factor according to the number of high-order zeros. It is necessary to calculate the compression for the I-channel signal and the Q-channel signal separately, and for Significant compression loss for small signals containing negative numbers
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[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0028] see figure 1 Shown, take every group of data length as 16bit as an example, the IQ data compression method of the present invention comprises the following steps:
[0029] 1) At the sending end, first convert the IQ data into a 16-bit binary number in the original code form, retain the sign bit of the 16-bit binary number, add an identifier 0 as a flag to the first bit of the 16-bit binary number in the positive sequence, and add the identifier 0 as the flag bit in the reverse sequence 16-bit binary number The first bit of the binary number is added with an identifier 1 as a flag bit, and two sets of parallel positive sequence 16bit binary numbers and reverse sequence 16bit binary numbers are obtained;
[0030] 2) According to the characteristics of IQ data, in addition to the sign bit and the flag bit, the positive sequence 16bit binar...
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The invention discloses a method and a system for compressing IQ (In-phase / Quadrature) data, wherein the method comprises the steps of, at the transmitting end, converting each group of data into Lbit binary numbers in true form at first, remaining the sign bit (the first bit) of the group of data, in the meantime, adding a bit as a positive / negative sequence sign bit to the first bit, processing the rest (L-1) bits, dividing the data into a plurality of groups m according to own characteristics, and carrying out rational abandoning to obtain compressed data. The method is characterized in that the algorithm is executed for both positive and negative sequences in a parallel manner so as to achieve optimal EVM (Error Vector Magnitude) and optimal compression ratio; at the receiving end, zeros padding is performed on the received compressed data according to the characteristics of each group of data and then corresponding data recovery is completed. The method and the system for compressing the IQ data are capable of realizing synchronous operation of multi-carrier IQ data compression, and transmitting the branch of data compressed more obviously according to the compression effects of the positive and negative sequences, and as a result, the compression efficiency is improved and hardware implementation of the method and the system can be fulfilled easily.
Description
[0001] 【Technical field】 [0002] The invention relates to the technical field of mobile communication, in particular to an IQ data compression method and system. [0003] 【Background technique】 [0004] In a mobile communication system, a base station includes a baseband processing unit (BBU) and a remote radio unit (RRU). The BBU and the RRU are connected by an optical fiber to transmit IQ data bidirectionally. The IQ data is the baseband digital signal. The baseband digital signal includes an I-channel signal and a Q-channel signal. [0005] In the base station of the TDD-LTE system, the IR (Interface between the BBU and the RRU) protocol is used between the BBU and the RRU to transmit IQ data. As the transmission data of the air interface continues to increase, the pressure and cost of IR transmission continue to rise. , many manufacturers in the industry have proposed a variety of different methods to compress the bit width of IQ data transmission. [0006] Currently kn...
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IPC IPC(8): H04L1/00H04L29/06
Inventor 张超陈亚伟
Owner XI AN JIAOTONG UNIV