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 to 3. Index compression indexes, including indexes on declared or created temporary tables, can be compressed in order to reduce storage costs. The common public radio interface cpri intel fpga ip core implements the cpri specification v7. Further, the use of hardware probes within an ethernet fronthaul could aid the optimisation of performance the use of the selfoptimising network.
Recently, a number of iq data compression algorithms have been proposed. 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. The ethernet control channel could be used to support network management protocols. Data compression for highspeed dsp, part 1 ee times. Cpri data compression using nonuniform quantized huffman technique in c ran. Such changes include baseband processing centralization cran and new network capabilities such as higherorder mimo configurations and carrier aggregation. You can use the lzo compression scheme or the gzip compression scheme. In the cran architecture, a large number of rrus are con. Well, the actual algorithms that decide what data gets thrown out in lossy methods and how to best store redundant data in lossless compression are extremely complicated. The file compression category includes software programs that will archive your files and extract archived. Cpri compression transport for lte and ltea signal in cran.
With the right file compression software, sharing and archiving files is easy. File compression for windows free software downloads and. You can use 7zip on any computer, including a computer in a commercial organization. Audio compression algorithms are implemented in software as audio codecs.
The iq compression ip core is a silicon agnostic implementation of a compression and decompression scheme enabling doubling data capacity on exiting cpri. Using the characteristics of the lte signal data, we remove the redundancy in the spectral domain. 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. This is the default and recommended compression method for most types of input data. In addition, there are file compression formats, such as arc and zip. These windows compression tools allow you to quickly and securely compress or zip and unzip files to conserve storage space, speed up email. To address surging costs of cpribased fronthaul to be caused because of drasticallyincreased ultra high capacity of 5g base station, measures have been proposed. Cpri compression transport for lte and ltea signal in c. For auxiliary copy operations, data is copied in the compressed state. Sep, 2011 winzip is one of the most popular compression software. The compression ip handles any radio channel bandwidth and operates on timedomain iq.
Different bandwidth requirements and signal characteristics of the lte downlink and uplink channels imply the use of channelspecific codec configurations. Data compression is the process of modifying, encoding or converting the bits structure of data in such a way that it consumes less space on disk. The common public radio interface cpri standard defines the interface of base stations between the radio equipment controllers rec in the standard, to local or remote radio units, known as radio equipment re fronthaul 1. In signal processing, data compression, source coding, or bitrate reduction involves encoding information using fewer bits than the original representation. The gfpt data frame passes through the gfpt frame processing unit 35 to obtain individual 64b65b code blocks, the 64b65b code blocks pass through the 64b65b decoding unit 36 to obtain the cpri compressed frame data stream, and finally, the cpri frame format information obtained from the cmf frame by the cmf frame processing unit 34 passes. The reduction comes at the expense of some computational effort to compress and decompress. This paper proposes a new iq data compression scheme with 12. Good compression ratio is achieved thanks to the reduction of control information redundancy in common public radio interface cpri structure introduced in 8. Data compression simple english wikipedia, the free. The demand for wireless data has, and is set to continue to increase. In conclusion, data compression is very important in the computing world and it is commonly used by many applications, including the suite of syncback programs. It performs vital functions such as pa linearization and it hosts the radio control unit managing the radio head itself. Saifur rahman, and jianzhong charlie zhang abstract the future wireless network, such as centralized radio access network cran, will need to deliver data rate about 100 to times the current 4g technology. By compressing data on a global scale, existing infrastructure will be able to cope with rising demand.
Software defined applications in cellular and optical networks. Userplane data consumes a large amount of cpri bandwidth resources in each cell. Lowloss compression of cpri baseband data richard maiden altera edn september 17, 2014 modern wireless infrastructure systems use fibers running a cpri common public radio interface protocol to communicate frequency, phase, complex data, and control information. When compression algorithms are discussed in general, the word compression alone actually implies the context of both compression and decompression in this book, we sometimes do. Winzip is one of the most popular compression software. For over 25 years, ahas applicationspecific compression algorithm products have been improving performance in data storage, networking, copiers, printers, scanners and other imaging equipment. To support more carriers or rrusrfusprrus on a cpri. Sep 24, 20 7zip is a wellknown opensource alternative to paid compression software. Both the cpri compression and iq mapper tool have been incorporated. Mulaw compression is common in audio applications and is efficient to implement, but it has an excessive loss in fidelity for baseband signals.
The longterm evolution lte transports complexbaseband samples between the remote radio head and baseband processing unit. Were building the very highest compression rate possible, with low latency and zero loss. Compression is supported by backup software and tape libraries, so there is a choice of data compression techniques. High performance is obtained by exploiting statistical properties of the data.
Ida mengyi pu, in fundamental data compression, 2006. Lossy audio compression algorithms provide higher compression at the cost of fidelity and are used in. Hence, we created a list of free top 5 compression utilities that you can use if paying is not an option for you. As software defined networking sdn is already being developed for ipethernet networks, the use of ethernet in the fronthaul lends itself to this far more easily than using cpri based transport. Od77 the data is compressed by using an lz77 algorithm. How does data compression work from a technical standpoint. A new iq data compression scheme for fronthaul link in centralized. The common public radio interface cpri standard defines the interface of base stations between the radio equipment controllers rec in the standard, to local or remote radio units, known as radio equipment re. Compression saves disk storage space by using fewer database pages to store data. Compression algorithm an overview sciencedirect topics. A compression technique that does not decompress digital data back to 100% of the original. Lossy methods can provide high degrees of compression and result in smaller compressed files, but some. Cpri data compression using nonuniform quantized huffman technique in cran abstract.
He recently added a reference to the protein corpus, a set of difficult to compress files that were first published at the 1999 data compression conference. File compression is the practice of packaging a file or files to use less disk space. 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. The digital unit is at the heart of every radio product and is the enabler of software configurability. Data compression is a set of steps for packing data into a smaller space, while allowing for the original data to be seen again. The evergrowing size of hard drives means the need to reduce file sizes when storing data has been reduced, but sdds.
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. Any compression algorithm will not work unless a means of decompression is also provided due to the nature of data compression. Also shown in figure 3 is the required cpri data with 2. Data compression is also known as source coding or bitrate reduction. Iq compression ip core is a silicon agnostic implementation of a compression and decompression scheme enabling doubling data capacity on existing cpri.
Common public radio interface cpri protocol is used in practice and enables flexible radio head deployments and distributed antenna. The data is compressed by using a 16bit lzw algorithm. Outcome the proposed compression scheme achieved a 50 % data compression with keeping the lte. We experimentally demonstrate cpri data compression based on a partial bit sampling and compare its performance with other compression methods. You do not need to pay for this software even after use in commercial computer. The aim of data compression is to reduce redundancy stored or ated unic comm. Cpri compression compounds the difficultly since different bit widths can be used. Cpri is a highspeed serial interface for network radio equipment controllers rec to receive data from and provide data to remote radio equipment re. A new iq data compression scheme for fronthaul link in.
The longterm evolution lte transports complexbaseband. Reducing data size for storage, transmission, and cpu overhead are the key benefits of ahas line of lossless data compression ics and addin cards. Cpri data compression using nonuniform quantized huffman. The iq compression ip core is a silicon agnostic implementation of a compression and decompression scheme enabling doubling data capacity on existing cpri or ethernet based links or alternatively running lower speed links between remote radio units and baseband. It allows a compression application to interface with either a hardware or software compression engine to execute data compression. Compression significantly reduces cpri data rate requirements and provides system cost savings by using lower data rate optics. Sep 17, 2014 the cpri standard provides a frame structure and general approach to mapping iq data on the cpri frame, but there is no rigid standard, and vendors implement a variety of schemes. Data compression is also widely used in backup utilities, spreadsheet applications, and database management systems. A lossy cpri compression algorithm will degrade signal quality by compressing the data in a manner that cannot be recovered but have the. A simplified application shown in figure 1 illustrates the placement of compression and decompression modules at the cpri iq input and output interface. Audio data compression, not to be confused with dynamic range compression, has the potential to reduce the transmission bandwidth and storage requirements of audio data. 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.
Ori release 4, published in october 2014, is based on cpri version 6. Here is a list of six such software that you can use to compress files in windows and mac. From classic compression software such as winzip and winrar, to slightly less well known, but still hugely popular file compression apps such as 7zip and universal extractor, filehippo is home to the best free data compression software. It enables reducing the storage size of one or more data instances or elements. Release 4 adds iq data compression for lte and supports a line bit rate up to 10. Xlabs is using artificial intelligence to build the most advanced data compression software ever created.
As an alternative approach to ecpri, data compression techniques are now being developed for implementation at the rru, targeted to accommodate the extreme data throughput introduced with massive mimo while ultimately reducing fronthaul bandwidth requirements to a level commensurate with todays lte mimo architectures a cpri data rate. Content manager ondemand compresses the input data. Pros and cons of compression the main advantages of compression are a reduction in storage hardware, data transmission time and communication bandwidth and the resulting cost savings. Top 5 best free file compression software for windows. Very low compression delay and evm degradation less than 3. It performs vital functions such as pa linearization and it hosts. The needed fronthaul capacity can be limited by cpri compression 5, or by functional. Experimental demonstration of cpri data compression based. Lossless compression reduces bits by identifying and eliminating statistical redundancy. It is compatible with windows 7, vista, 98, me, 2000 etc.
It is up to the wireless oem to determine the allocation of this evm budget to cpri compression. 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. Aviat networks compression will likely be required to make wireless cpri fronthaul a reality takeaway. Table compression you can use less disk space for your tables by taking advantage of the db2 table compression capabilities. 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. Considering the over sampling and 14 bits linear quantization in cpri signal, it is possible to realize the suitable iq data compression which can maintain required evm, aclr, latency and other transport performance. In providing a brief overview on how compression works in general it is hoped this article allows users of data compression to weigh the advantages and disadvantages when working with it. We propose using a lowlatency baseband signal compression algorithm to solve this problem by reducing the. The cpri standard provides a frame structure and general approach to mapping iq data on the cpri frame, but there is no rigid standard, and vendors implement a variety of schemes.
The keysight vsa software was then used to demodulate the vivado hls simulation output. A simplified application shown in figure 1 illustrates the placement of compression and decompression modules at the cpri. Software compression is available for all storage media. Figure 1 wireless system with cpri iq compressiondecompression. Gzip is the default compression scheme, but you can use an additional setting to change the compression scheme on a client. Certain types of data, such as bitmapped graphics, can be compressed to a small fraction of their normal size. 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. Us7680149b2 cpri link multiplex transmission method and. It has earned a large user base, despite its plain almost dull interface because it works welland for most people. This unit interfaces with the baseband unit using the obsai or cpri protocols.
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