Results 1 - 10 of 86

Effective Erasure Codes for Reliable Computer Communication Protocols

by Luigi Rizzo , 1997
"... Reliable communication protocols require that all the intended recipients of a message receive the message intact. Automatic Repeat reQuest (ARQ) techniques are used in unicast protocols, but they do not scale well to multicast protocols with large groups of receivers, since segment losses tend to b ..."
Abstract - Cited by 470 (14 self) - Add to MetaCart
Reliable communication protocols require that all the intended recipients of a message receive the message intact. Automatic Repeat reQuest (ARQ) techniques are used in unicast protocols, but they do not scale well to multicast protocols with large groups of receivers, since segment losses tend

ARQ strategies for 2×2 spatially multiplexed

by Mimo Systems, Elisabeth De Carvalho, Petar Popovski
"... Abstract — This paper presents packet retransmission strategies for MIMO spatial multiplexing (SM) systems with independent coding and independent ARQ processes per stream. The received signals containing the retransmitted packets are kept in memory and combined. We present two methods to select the ..."
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Abstract — This paper presents packet retransmission strategies for MIMO spatial multiplexing (SM) systems with independent coding and independent ARQ processes per stream. The received signals containing the retransmitted packets are kept in memory and combined. We present two methods to select

PPR: Partial Packet Recovery for Wireless Networks

by Kyle Jamieson, Hari Balakrishnan - In ACM SIGCOMM , 2007
"... Bit errors occur in wireless communication when interference or noise overcomes the coded and modulated transmission. Current wireless protocols may use forward error correction (FEC) to correct some small number of bit errors, but generally retransmit the whole packet if the FEC is insufficient. We ..."
Abstract - Cited by 117 (6 self) - Add to MetaCart
packet recovery (PPR) system. PPR incorporates two new ideas: (1) SoftPHY, an expanded physical layer (PHY) interface that provides PHY-independent hints to higher layers about the PHY’s confidence in each bit it decodes, and (2) a postamble scheme to recover data even when a packet preamble is corrupted

A Flexible Bufferless H-ARQ Processor Based on Dataflow Scheduling

by Pierre-henri Horrein, Christine Hennebert, Frédéric Pétrot
"... Abstract—Flexible radio is a challenging way to implement com-munication standards. In theses standards, Hybrid ARQ (H-ARQ) is admitted as a usual error control protocol. H-ARQ is a cross-layer protocol, offering a number of different possible versions, with multiple instantiations running concurren ..."
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operation mode. Data representation is used to create codewords, associated to an operation. A new buffer management scheme, based on software buffers and independent of the number of protocol instantiations, is proposed. The resulting architecture is able to process any H-ARQ protocol with no throughput

Evaluation of nutritional status of nonhospitalized patients with liver cirrhosis. Arq Gastroenterol

by Luciana Carvalho, Edison Roberto Parise
"... ABSTRACT – Background- Protein-calorie malnutrition is a frequent fi nding in patients with chronic liver disease, but investigations of nutritional status have been rarely performed in individuals seen at outpatient clinics. Aim- To evaluate the nutritional status of patients with alcoholic and non ..."
Abstract - Cited by 7 (0 self) - Add to MetaCart
-hour dietary recall data. Results- About 71 % of the patients studied were chronic alcohol abusers, whereas in 29 % cirrhosis was of nonalcoholic etiology. Independently of the disease etiology 75.3 % of the patients showed some degree of protein-calorie malnutrition, which was moderate or severe in 38

Throughput of RCPT Hybrid ARQ for DS-CDMA with Diversity Reception and Rake Combining

by Deepshikha Garg, Fumiyuki Adachi
"... Abstract — In this paper, we evaluate by computer simulations the throughput performance of rate compatible punctured turbo coded hybrid ARQ (RCPT HARQ) for direct sequence code division multiple access (DS-CDMA) with antenna diversity reception and rake combining in a frequency selective Rayleigh f ..."
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Abstract — In this paper, we evaluate by computer simulations the throughput performance of rate compatible punctured turbo coded hybrid ARQ (RCPT HARQ) for direct sequence code division multiple access (DS-CDMA) with antenna diversity reception and rake combining in a frequency selective Rayleigh

THROUGHPUT PERFORMANCE OF ARQ AND HARQ I SCHEMES OVER A TWO-STATES MARKOV CHANNEL MODEL

by Hatem Boujemâa, Mimouna Ben Said, Mohamed Siala
"... In this paper, we evaluate the throughput performance of ARQ and HARQ I schemes over a two-states Markov channel model. The derived results are compared to those obtained for a block fading channel where the channel is constant over each transmitted packet and independent during the different transm ..."
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In this paper, we evaluate the throughput performance of ARQ and HARQ I schemes over a two-states Markov channel model. The derived results are compared to those obtained for a block fading channel where the channel is constant over each transmitted packet and independent during the different

Joint Source Channel Coding With Hybrid FEC/ARQ For Buffer Constrained Video Transmission

by Rohit Puri, Kannan Ramchandran, Antonio Ortega , 1998
"... We propose an Automatic Repeat Request (ARQ) / Forward Error Correction (FEC) scheme for synchronous transmission of video over a binary symmetric constant rate channel. The approach consists of jointly allocating source and channel rates to video blocks from a given admissible set subject to the bu ..."
Abstract - Cited by 7 (0 self) - Add to MetaCart
We propose an Automatic Repeat Request (ARQ) / Forward Error Correction (FEC) scheme for synchronous transmission of video over a binary symmetric constant rate channel. The approach consists of jointly allocating source and channel rates to video blocks from a given admissible set subject

IEEE COMMUNICATIONS LETTERS 1 A MAC/PHY Cross-Layer Design for Efficient ARQ Protocols

by Dongmyoung Kim, Student Member, Youngkyu Choi, Student Member, Sunggeun Jin, Kwanghun Han, Student Member, Sunghyun Choi, Senior Member
"... Abstract—In many wireless data systems, automatic repeat re-quest (ARQ) and hybrid automatic repeat request (HARQ) work independently. In this paper, we introduce a new ARQ feedback scheme called Cross-Layer ARQ (CL-ARQ), where ARQ closely interoperates with HARQ by making use of the acknowledgement ..."
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Abstract—In many wireless data systems, automatic repeat re-quest (ARQ) and hybrid automatic repeat request (HARQ) work independently. In this paper, we introduce a new ARQ feedback scheme called Cross-Layer ARQ (CL-ARQ), where ARQ closely interoperates with HARQ by making use

An Optimal Power Allocation Scheme for the STC Hybrid–ARQ over Energy Limited Networks

by Hongbo Liu, Leonid Razoumov, Narayan M, Predrag Spasojević
"... Abstract—In this paper, we show that for STC (Space-Time Coded) Hybrid-ARQ (Automatic Repeat reQuest) schemes with (re)transmission power control over independent Rayleigh block fading channels, the problem of optimizing energy efficiency with a PER (Packet Error Rate) constraint can be solved as a ..."
Abstract - Cited by 2 (0 self) - Add to MetaCart
Abstract—In this paper, we show that for STC (Space-Time Coded) Hybrid-ARQ (Automatic Repeat reQuest) schemes with (re)transmission power control over independent Rayleigh block fading channels, the problem of optimizing energy efficiency with a PER (Packet Error Rate) constraint can be solved as a
Results 1 - 10 of 86