Recent Advances in Coding Theory for Near Error-Free Communications
نویسندگان
چکیده
He then showed that the most efficient solution to this fundamental problem necessarily involved coding the selected message, before transmission over the channel. Shannon did not say exactly how this coding should be done; he only proved mathematically that efficient coding schemes must exist. Since 1948, a whole generation of later researchers has validated Shannon’s work by devising explicit and practical coding schemes, which are now part of practically every modern digital communication system. Near-earth satellite communication systems, high performance military systems, computer communication networks, high speed modems, and compact-disk recording and playback systems, all rely heavily on sophisticated coding schemes to enhance their performance. The communication channel which has benefitted most from Shannon’s insights, perhaps, is the deep-space channel, i.e., the channel by which spacecraft like Pioneer,Mariner, Voyager, etc., transmit their astonishing views of the Solar System back to planet Earth. In this paper we will discuss the benefits that coding has already brought to deep-space communication, and the benefits that may yet become a reality. Coding has traditionally been divided into two branches: channel coding and source coding. The goal of channel coding is to protect the transmitted message from the errors and distortions which may be caused by the channel. The goal of source coding (sometimes also called data compression), on the other hand, is to ensure that the transmitted message is as dense with information as possible. While channel coding has historically been the more important contributor to deep-space communication technology, future gains may come largely from source coding.
منابع مشابه
Gallager Codes – Recent Results
In 1948, Claude Shannon posed and solved one of the fundamental problems of information theory. The question was whether it is possible to communicate reliably over noisy channels, and, if so, at what rate. He defined a theoretical limit, now known as the Shannon limit, up to which communication is possible, and beyond which communication is not possible. Since 1948, coding theorists have attem...
متن کاملAdvanced Wireless Communications Technologies for Low Power, Reconfigurable Small Satellite Radios
Advances in smart antennas, coding theory, power amplifiers, low-power electronics, and softwaredefined radios have dramatically impacted terrestrial communications. The improvements achieved in frequency reuse, interference mitigation, handset battery life, error performance, and hardware reconfigurability can be transitioned to small satellite communications systems. The stringent power budge...
متن کاملConstruction of Irregular QC-LDPC Codes in Near-Earth Communications
—High-speed, high-reliability requirements and strict power limitation of near-earth communications yield that the channel coding must have high coding gain and lower error floor. In this paper, an irregular quasi-cyclic low-density paritycheck (QC-LDPC) code for specific use in near-earth communications is proposed. In order to eliminate the impact of short-cycles and further improve the perf...
متن کاملInduction of apoptosis and necrosis in human acute erythroleukemia cells by inhibition of long non-coding RNA PVT1
Recent advances in molecular medicine have proposed new therapeutic strategies for cancer. One of the molecular research lines for the diagnosis and treatment of cancer is the use of long non-coding RNAs (LncRNAs) which are a class of non-coding RNA molecules longer than 200 base pairs in length that act as the key regulator of gene expression. Different aspects of cellular activities like cell...
متن کاملCoding enhanced joint detection for multiple access communications
A low complexity approach to coding-enhanced multi-user detection is developed to mitigate the problems associated with nearfar effect and to permit a more efficient assignment of channel resources relative to current multiple access (MA) communications systems. Through prudent integration of error correction decoding, multi-user and inter-symbol integeretace equalization and stripping, a low c...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1995