Introduction the common public radio interface cpri is an industry cooperation aimed at defining a publicly available specification for the key internal interface of radio base stations between the radio equipment control rec and the radio equipment re. Compression significantly reduces cpri data rate requirements and. Cpri data compression using nonuniform quantized huffman. Us patent 5,533,051 on methods for data compression, which is capable of compression all files. It should be realized that the root cause for the fh challenge lies exactly at the fh interfaces themselves. The aim of this article is to present the cpri specification, its concept, design, and.
Common public radio interface cpri uses optical fiber link between rrh and bbu transports complexbaseband wireless samples needs expensive link to support high data rates data compression is necessary i rrh b s bbu ue bs bs bs bs cloud l system model multiantenna compression uplink y mn xt t1 s tn. Mulaw compression is common in audio applications and is efficient to implement, but it has an excessive loss in fidelity for baseband signals. Managing scientific data zoelacroixandterencecritchlow how to build a digital library ianh. Osa key technologies for nextgeneration digital rof.
Data compression compression reduces the size of a file. Zeosync has announced a breakthrough in data compression that allows for 100. The emerging need for fronthaul compression june 2016 altera corporation figure 2. Reduce file size while optimizing for maximal pdf quality. Introduction to data compression, third edition morgan. Also shown in figure 3 is the required cpri data with 2. Cpri line rates rate1,2,3,4,5,6,7a,7,8,9,10 of cpri line. Cpri data compression using nonuniform quantized huffman technique in cran. Lte transports complexbaseband samples between the remote radio head and baseband processing unit. Compression is used to compress data in wireless systems on the link between the remote radio unit rru and the baseband card wired over cpri or cpri over wireless front haul. Keystone ii architecture antenna interface 2 aif2 users guide literature number. The table covers cpri line rate1,2,3,4,5,6,7a,7,8,9 and 10.
Gomesa, philippe chancloub, peter turnbullc, anthony mageec. As a counterpart of analog radiooverfiber technology, digital radiooverfiber drof system, such as common public radio interface cpri, is a matured and robust solution to support rf signal delivery in traditional mobile fronthaul networks. This paper describes a method of using mulaw compression for gaussianlike waveforms for example, baseband iq data, as used in cpri interfaces. Up to now, compression factors of 2 have been shown to be lossless with some tolerable loss for a compression factor of 3 6. An overview of the cpri speciacation and its application.
Cpri define how to exchange the radio signal data not the data content itself nor the associated management plane. Timeline of cpri releases and line rates in anticipation of the required data rates for ltea the cpri standards group released. In the cran architecture, a large number of rrus are con. Cpri compression transport for lte and ltea signal in c. A new iq data compression scheme for fronthaul link in. Arithmetic coding is a data compression technique that encodes data the data string by creating a code string which represents a fractional value on the number line between 0 and 1. Cpri data compression 5 cpri basic frame each frame has 16 words. Tdm epon fronthaul capacity improvement through traffic. Cpri is a highspeed serial interface for network radio equipment controllers rec to receive data from and provide data to remote radio equipment re. Upload the pdf file to our fast servers and choose the compress pdf quality to reduce the size of your file or compress your pdf for email, image and web purposes. When reducing the file size of a pdf, various methods are used to make the file smaller. Other possibilities converting iq data series to frequency domain and. For cran based network architecture, there is a pressing need for tremendous enhancement of the effective data rate of the common public radio interface cpri. Our pdf compressor server will automatically start to reduce and drop the pdf file size with little wait time by keeping a relevant compression quality adapted for the internet.
Introduction to data compression, second edition khalidsayood multimedia servers. In this paper, we introduce a vector quantization based compression algorithm for cpri links, utilizing lloyd algorithm. Depending on what data is contained in the pdf, the compression works well or less well. The transport capacity of wcdma and lte axc are also mentioned. The presets are explained when it comes to changes that will be applies with regard to quality and dpi.
Wittenanddavidbainbridge digital watermarking ingemarj. Several solutions including cpri compression and wdm transport technologies have been proposed. Keystone ii architecture antenna interface 2 aif2 rev. The mapping methods of cpri are more efficient than obsai 6, and most global vendors have chosen cpri for their products. Release 4 adds iq data compression for lte and supports a line bit rate up to 10. Click the download compressed pdf file button to get the compressed file.
Introduction to data compression, third edition khalidsayood understanding digital libraries, second edition michaellesk bioinformatics. Obsai vs cpri obsai cpri 8b10b line coding 8b10b line coding up to 6. Cpri and its main features, including the user plane data, control and management, and synchronization information multiplexing. Statistical data compression and differential coding for.
Idt is the first company to offer commercial ip that supports gsm, wcdma, and lte signals at full cpri data rates, keeping high signal quality at compression rates up. Cpri data compression techniques have been explored to address the problem of marginal multiplexing gain due to high cpri line rate. Introduction 2 the common public radio interface cpri is an industry cooperation aimed at defining publicly available 3 specifications for the key internal interface of radio base stations, such as ecpri connecting the ecpri. Common public radio interface tero mustala and olivier klein, nokia. Outcome the proposed compression scheme achieved a 50 % data compression with keeping the lte. This paper proposes a new iq data compression scheme with 12 compression ratio, which can be easily implemented by using both iq bit width reduction and a common lossless audio compression scheme. Saeed darweesh and others published cpri data compression using nonuniform quantized huffman technique in cran find, read and cite all the research you need on. We experimentally demonstrate cpri data compression based on a partial bit sampling and compare its performance with other compression methods. Data compressionimplies sending or storing a smaller number of bits. Osa experimental demonstration of cpri data compression.
Compress pdf reduce your pdf file size online free. All you need to do to compress pdf document is to drag and drop the original file into the opened tab of your browser and pdf candy will start the pdf compression automatically. Both solutions are based on the implementation of digital radio over fibre drof concept, whereby the radio signal is sampled and quantised, and after encoding, transmitted towards the bbu pool. After that we provide an application example of an overview of the cpri speciacation and its application to cranbased lte scenarios. Cpri iq data compression use highlevel digital modulation to modulate iq data. Although many methods are used for this purpose, in general these methods can be divided into two broad categories.
Common public radio interface cpri protocol is used in practice and enables flexible radio head deployments and distributed antenna systems. Pdf24 uses the following techniques to compress a pdf. Besides, we also take common public radio interface cpri compression techniques 37 3839 into consideration, since the typical cpri physical link rate is fixed 19. Once you did so, you can choose a preset to change and adjust the quality of your pdf file. Ori release 4, published in october 2014, is based on cpri version 6. Slashdot reports of the zero space tuner and binaryaccelerator. Data data high rlc high rlc option 3 option options in 3gpp ran3 discussions refer to tr 38. Compression of cpri data is one of the potential enhancements. The signals are a volume of samples with complex value of a certain bit width, such as an ipart of 15 bits and a qpart of 15 bits. One antennacarrier is the amount of digital baseband iq uplane data necessary for either reception or transmission of only one carrier at one independent antenna element.
Of course, you have to store the matrix to decompress the data too, but if your original dataset is enough large, this is insignificant to the data itself. Cpri data compression and etsi ori standardization purpose practical cpri data compression technique in centralized radio access networks crans is investigated to mitigate the drawback of a higherspeed optical transmission in fronthaul links. Towards bandwidthefficient ethernetbased 5g mobile. The cpri common public radio interface is a popular standard to transport baseband iq signals to the radio unit in base station. Cpri specification v7 common public radio interface. Very low compression delay and evm degradation less than 3.
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