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. Outcome the proposed compression scheme achieved a 50 % data compression with keeping the lte. An overview of the cpri speciacation and its application. Cpri data compression using nonuniform quantized huffman technique in cran. Osa key technologies for nextgeneration digital rof. 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. 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. This paper describes a method of using mulaw compression for gaussianlike waveforms for example, baseband iq data, as used in cpri interfaces. Introduction to data compression, second edition khalidsayood multimedia servers. Mulaw compression is common in audio applications and is efficient to implement, but it has an excessive loss in fidelity for baseband signals. Zeosync has announced a breakthrough in data compression that allows for 100. Compression significantly reduces cpri data rate requirements and. 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. Cpri data compression techniques have been explored to address the problem of marginal multiplexing gain due to high cpri line rate.
Compression of cpri data is one of the potential enhancements. Several solutions including cpri compression and wdm transport technologies have been proposed. The emerging need for fronthaul compression june 2016 altera corporation figure 2. Very low compression delay and evm degradation less than 3. Reduce file size while optimizing for maximal pdf quality.
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. In this paper, we introduce a vector quantization based compression algorithm for cpri links, utilizing lloyd algorithm. Once you did so, you can choose a preset to change and adjust the quality of your pdf file. When reducing the file size of a pdf, various methods are used to make the file smaller. Us patent 5,533,051 on methods for data compression, which is capable of compression all files. 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. Click the download compressed pdf file button to get the compressed file. Other possibilities converting iq data series to frequency domain and. Gomesa, philippe chancloub, peter turnbullc, anthony mageec. In the cran architecture, a large number of rrus are con. After that we provide an application example of an overview of the cpri speciacation and its application to cranbased lte scenarios. A new iq data compression scheme for fronthaul link in. Next 15 words contains sampled iq data from receiving antennas. Cpri iq data compression use highlevel digital modulation to modulate iq data.
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. 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. Introduction to data compression, third edition morgan. There is a delay of one cpri frame between the presence of. Data compressionimplies sending or storing a smaller number of bits. Compress pdf reduce your pdf file size online free. Towards bandwidthefficient ethernetbased 5g mobile. Cpri data compression using nonuniform quantized huffman.
We experimentally demonstrate cpri data compression based on a partial bit sampling and compare its performance with other compression methods. Cpri and its main features, including the user plane data, control and management, and synchronization information multiplexing. It should be realized that the root cause for the fh challenge lies exactly at the fh interfaces themselves. Slashdot reports of the zero space tuner and binaryaccelerator. Cpri is a highspeed serial interface for network radio equipment controllers rec to receive data from and provide data to remote radio equipment re. Osa experimental demonstration of cpri data compression. 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. Managing scientific data zoelacroixandterencecritchlow how to build a digital library ianh. Data compression compression reduces the size of a file. The presets are explained when it comes to changes that will be applies with regard to quality and dpi. Depending on what data is contained in the pdf, the compression works well or less well.
Tdm epon fronthaul capacity improvement through traffic. Obsai vs cpri obsai cpri 8b10b line coding 8b10b line coding up to 6. The table covers cpri line rate1,2,3,4,5,6,7a,7,8,9 and 10. Very low compression delay and evm degradation less. Lte transports complexbaseband samples between the remote radio head and baseband processing unit. 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. The transport capacity of wcdma and lte axc are also mentioned. Cpri define how to exchange the radio signal data not the data content itself nor the associated management plane. 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. Release 4 adds iq data compression for lte and supports a line bit rate up to 10. Common public radio interface tero mustala and olivier klein, nokia. 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.
Keystone ii architecture antenna interface 2 aif2 users guide literature number. 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. Up to now, compression factors of 2 have been shown to be lossless with some tolerable loss for a compression factor of 3 6. Cpri specification v7 common public radio interface. Cpri data compression 5 cpri basic frame each frame has 16 words.
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. 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. The mapping methods of cpri are more efficient than obsai 6, and most global vendors have chosen cpri for their products. 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. Data data high rlc high rlc option 3 option options in 3gpp ran3 discussions refer to tr 38. Introduction to data compression, third edition khalidsayood understanding digital libraries, second edition michaellesk bioinformatics. Ori release 4, published in october 2014, is based on cpri version 6. Cpri compression transport for lte and ltea signal in c. 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. Timeline of cpri releases and line rates in anticipation of the required data rates for ltea the cpri standards group released. Keystone ii architecture antenna interface 2 aif2 rev. Statistical data compression and differential coding for. Wittenanddavidbainbridge digital watermarking ingemarj. 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.
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