some fundamental limits of unequal error protection

Borade, Shashi; Nakiboğlu, Barış; Zheng, Lizhong

doi:10.1109/isit.2008.4595385

Cited by 14 publications

(5 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There are several definitions for UEP codes in the literature (for example, and ). The main idea in all cases is to have a larger decision region for some special codewords with respect to the others.…”

Section: System Model and Problem Statementmentioning

confidence: 99%

“…(2) How to design such a codebook. In , the authors focus mainly on the first question. In particular, some bounds on the error exponent function of the codebook is provided to allow for larger decision regions for a subset of codewords.…”

Section: System Model and Problem Statementmentioning

confidence: 99%

“…Although the code design is referred to a code for ACMI in the specific satellite communication system model described in subsection 2, the design methodology can be generalized to different systems with similar constraints. In particular, the method yields a systematic way to construct variable‐length codebooks where codewords are not homogeneously distributed in the space, so that some codewords are more protected than others (see, for example, and the references within).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Code design for adaptive coding and modulation indicator in broadcast systems

Kayhan

Montorsi

2015

Int. J. Satell. Commun. Network.

View full text Add to dashboard Cite

In this paper, we address the coding problem for adaptive coding and modulator indicators in communication systems where users are divided into several classes according to their channel quality. Two novel methods are described to construct codebooks with variable length codewords for such an application. The proposed constructions satisfy all constraints of the system model, showing considerable gain in both the maximal and average length of codebook with respect to the current state of the art. The methodology includes a systematic way for constructing variable length codebooks where codewords are not uniformly distributed in the space, and thus, some codewords are more protected than others. The proposed construction can be easily adapted, by zero padding, to obtain a fixed block-length code, with length equal to the maximal length of the designed variable-length code but still smaller than that of the best state-of-the-art code. KEY WORDS: adaptive coding and modulation; frame-header; unequal error protection 1. INTRODUCTION Real-time adaptation of transmission parameters according to the channel conditions is a highly desirable feature in communication systems where the channel parameters may change in time and/or according to the addressed receiver. Time and/or user varying channel condition is an important characteristics of most communication systems such as satellite, cellular networks, and broadcast systems in general. Adaptive coding and modulation (ACM) schemes are used in such systems to provide significant capacity gains by real-time adaptation of the forward error correction (FEC) code rate/length and modulation constellation [1].By employing an ACM scheme, the transmitter is able to switch between several constellations and codes choosing the largest available modulation and code rate, which ensures a target detection error rate (DER), thus providing the maximum reliable spectral efficiency to each user. To successfully decode the message, each user must be able to identify the parameters of the constellation and code, which has been used by the transmitter. To this purpose, each packet consists of two main parts: The first part is called the frame-header (or simply the header) and contains the information regarding the modulation and coding parameters (adaptive coding modulation indicator (ACMI)). The second part is the message, which is encoded using the corresponding ACM parameters. Therefore, it is crucial for each user to preliminary decode the information in the frame-header.In this paper, we concentrate on the coding design problem for the ACMI. Even though the ACMIs usually employ a maximum of 10 bits, the coding strategy is not trivial due to the wide dynamic range of the signal-to-noise ratio (SNR) of the system users. Coding design for frame-headers as a part of the physical layer strongly depends on the system architecture and must satisfy several constraints.

show abstract

Section: System Model and Problem Statementmentioning

confidence: 99%

Section: System Model and Problem Statementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Code design for adaptive coding and modulation indicator in broadcast systems

Kayhan

Montorsi

2015

Int. J. Satell. Commun. Network.

View full text Add to dashboard Cite

show abstract

“…For the binary symmetric channel (BSC), the optimal red alert exponent has a simple and illustrative form. This exponent can be inferred from the general expression in [3,Lemma 1] or via a direct proof due to Sahai and Draper [4] (which appeared concurrently with the conference version [7] of [3]). Let p denote the crossover probability of the BSC and q the probability that a symbol in the codebook is a one.…”

Section: A Related Workmentioning

confidence: 99%

The AWGN Red Alert Problem

Nazer

Shkel

Draper

2013

IEEE Trans. Inform. Theory

View full text Add to dashboard Cite

Consider the following unequal error protection scenario. One special message, dubbed the "red alert" message, is required to have an extremely small probability of missed detection. The remainder of the messages must keep their average probability of error and probability of false alarm below a certain threshold. The goal then is to design a codebook that maximizes the error exponent of the red alert message while ensuring that the average probability of error and probability of false alarm go to zero as the blocklength goes to infinity. This red alert exponent has previously been characterized for discrete memoryless channels. This paper completely characterizes the optimal red alert exponent for additive white Gaussian noise channels with block power constraints.Comment: 13 pages, 10 figures, To appear in IEEE Transactions on Information Theor

show abstract

“…Often, some parts of the information to be transmitted are more important, hence Unequal Error Protection is required. UEP is required for wireless communication system to support a multitude of service [5]. Hierarchical, embedded constellation is a practical way of achieving UEP, which is based on uniform signal constellation [6].…”

Section: Introductionmentioning

confidence: 99%

LDPC coded adaptive multiresolution modulation for Unequal Error Protection

Rajkumarsingh

Nuckchady

2013

2013 Africon

View full text Add to dashboard Cite

Wireless Communications system in the coming future will need to support a large amount of services, each with a different Quality of Service (QOS). This paper proposes a system model which uses Adaptive Multiresolution Modulation (AMM) of 16, 64 and 256 Quadrature Amplitude Modulation (QAM) along with Low Density Parity Check (LDPC) codes of different code rates as a Forward Error Correcting (FEC) code to provide UEP for the heterogeneous traffic and also for maintaining the (QOS) of the different services at the desired level. Comparing with previous works, the difference with the proposed system is that channel coding is accounted while determining the shape of QAM at which the system performs best. Also, a multiresolution modulation is designed which does not degrade the performance of the least important message as that of the most important one is increased. A BER performance gain of 36.6 dB arises for the high priority message with the proposed scheme when compared to a fixed modulation scheme with the same coding used.

show abstract

some fundamental limits of unequal error protection

Cited by 14 publications

References 5 publications

Code design for adaptive coding and modulation indicator in broadcast systems

Code design for adaptive coding and modulation indicator in broadcast systems

The AWGN Red Alert Problem

LDPC coded adaptive multiresolution modulation for Unequal Error Protection

Contact Info

Product

Resources

About