Journal ArticleDOI
Code Combining--A Maximum-Likelihood Decoding Approach for Combining an Arbitrary Number of Noisy Packets
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TLDR
The receiver adapts to the actual jammer-to-signal(J/S)ratio which is critical when the level of interference is not known a priori, and optimizes the code rate and minimizes the delay required to decode a given packet.Abstract:
It is well known that if the data rate is chosen below the available channel capacity, error-free communication is possible. Furthermore, numerous practical error-correction coding techniques exist which can be chosen to meet the user's reliability constraints. However, a basic problem in designing a reliable digital communication system is still the choice of the actual code rate. While the popular rate-1/2 code rate is a reasonable, but not optimum, choice for additive Gaussian noise channels, its selection is far from optimum for channels where a high percentage of the transmitted bits are destroyed by interference. Code combining represents a technique of matching the code rate to the prevailing channel conditions. Information is transmitted in packet formats which are encoded with a relatively high-rate code, e.g., rate 1/2, which can be repeated to Obtain reliable communications when the redundancy in a rate-1/2 code is not sufficient to overcome the channel interference. The receiver combines noisy packets (code combining) to obtain a packet with a code rate which is low enough such that reliable communication is possible even for channels with extremely high error rates. By combining the minimum number of packets needed to overcome the channel conditions, the receiver optimizes the code rate and minimizes the delay required to decode a given packet. Thus, the receiver adapts to the actual jammer-to-signal (J/S) ratio which is critical when the level of interference J is not known a priori.read more
Citations
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Journal ArticleDOI
Rate-compatible punctured convolutional codes (RCPC codes) and their applications
TL;DR: In this article, the concept of punctured convolutional codes is extended by punctuating a low-rate 1/N code periodically with period P to obtain a family of codes with rate P/(P+l), where l can be varied between 1 and (N-1)P. This allows transmission of incremental redundancy in ARQ/FEC (automatic repeat request/forward error correction) schemes and continuous rate variation to change from low to high error protection within a data frame.
Journal Article
Rate-compatible punctured convolutional codes (RCPC codes) and their applications
TL;DR: The concept of punctured convolutional codes is extended by punctuating a low-rate 1/N code periodically with period P to obtain a family of codes with rate P/(P+l), where l can be varied between 1 and (N-1)P.
Journal ArticleDOI
The throughput of hybrid-ARQ protocols for the Gaussian collision channel
Giuseppe Caire,Daniela Tuninetti +1 more
TL;DR: The throughput of automatic retransmission request (ARQ) protocols is compared to that of code division multiple access (CDMA) with conventional decoding and Interestingly, the ARQ systems are not interference-limited even if no multiuser detection or joint decoding is used, as opposed to conventional CDMA.
Journal ArticleDOI
On the performance of hybrid FEC/ARQ systems using rate compatible punctured turbo (RCPT) codes
D.N. Rowitch,L.B. Milstein +1 more
TL;DR: The proposed RCPT-ARQ system combines the performance of turbo codes with the frugal use of incremental redundancy inherent in the rate compatible punctured convolutional codes of Hagenauer (1988) to achieve enhanced throughput performance over a nonstationary Gaussian channel.
Journal ArticleDOI
Applications of error-control coding
TL;DR: An overview of the many practical applications of channel coding theory in the past 50 years is presented and examples, both historical and current, are given that typify the different approaches used in each application area.
References
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Viterbi Decoding for Satellite and Space Communication
J. Heller,I. Jacobs +1 more
TL;DR: Convolutional coding and Viterbi decoding, along with binary phase-shift keyed modulation, is presented as an efficient system for reliable communication on power limited satellite and space channels.
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A Modified Selective-Repeat Type-II Hybrid ARQ System and Its Performance Analysis
Yu-Ming Wang,Shu Lin +1 more
TL;DR: The throughput efficiency of the pure selective-repeat ARQ for any receiver buffer size can be obtained and it is shown that the modified scheme achieves the same order of reliability as a pure ARQ scheme.
Journal ArticleDOI
An Improved Selective-Repeat ARQ Strategy
TL;DR: Analysis of a new procedure for handling retransmissions in a selective-repeat ARQ system with a receive buffer of minimal size shows that it yields higher throughput than earlier ARQ techniques, and for modest receive buffer size, its throughput differs little from channel capacity.
Journal ArticleDOI
Retransmission Error Control with Memory
TL;DR: An error control technique that is a basic improvement over ARQ is presented, termed ARQ-with-memory (MRQ), which uses the simple idea of utilizing erroneously received blocks in an ARQ system for error control, retaining most of the other aspects of ARQ.