Results 171 to 180 of about 2,052 (205)

Adaptive HARQ with Memoryless Relays

2011 IEEE Vehicular Technology Conference (VTC Fall), 2011
In a relay enhanced system the classical HARQ schemes should be adapted to exploit the better channel conditions of the relay in comparison to the direct link. In particular, we need to decide which node (either the source or one of the relays) should retransmit and how many resources have to be spent to avoid further retransmissions.
Petra Weitkemper, Hidekazu Taoka
openaire   +1 more source

Rate Adaptation for Cooperative HARQ

IEEE Transactions on Communications, 2014
We analyze the average throughput and the outage probability for relay-based incremental redundancy HARQ transmission over block fading channel. We focus on the effects of having an error-free multi-bit feedback channel instead of the single-bit ACK/NACK feedback used in conventional HARQ.
Saeed R. Khosravirad, Leszek Szczecinski, Fabrice Labeau   +2 more
openaire   +1 more source

On the Self-Decoding of Polar-Coded HARQ

IEEE Communications Letters, 2021
In this letter, we concern the self-decoding capability of polar-coded hybrid automatic repeat request (Polar-HARQ) schemes. The proposed self-decoding method enables the incremental redundancy (IR) based Polar-HARQ to recover all source bits solely using the retransmission codewords. It provides an extra decoding chance when the joint decoding attempt
Jincheng Dai, Wei Wang 0484, Dexin Zhang, Kai Niu 0001   +3 more
openaire   +1 more source

Performance Evaluation Using Smart: HARQ Versus HARQ Mechanisms Beyond 5G Networks

Wireless Personal Communications, 2019
Since the basic objective of all communication systems is to provide a high-quality performance, the development of effective retransmission schemes with incremental redundancy has gained significant importance recently. In this regard, two retransmission mechanisms had been addressed the hybrid-automatic repeat request (HARQ) and the new smart hybrid ...
Hesham A. Sakr, Mohamed Azim Mohamed
openaire   +1 more source

NTC-HARQ: Network–Turbo-Coding Based HARQ Protocol for Wireless Broadcasting System

IEEE Transactions on Vehicular Technology, 2015
Wireless broadcasting systems employ multiple retransmissions to guarantee the correct reception of each packet. The traditional hybrid automatic retransmission request (HARQ) protocol retransmits one packet per slot. Hence, a large amount of retransmissions is required to correctly receive all the packets, which leads to low spectrum efficiency.
Kui Xu 0001, Wenfeng Ma, Lei Zhu, Youyun Xu, Yuanyuan Gao, Dongmei Zhang 0004, Wei Xie 0001   +6 more
openaire   +1 more source

Mapping Rearrangement for HARQ Based on BPSK

IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference, 2008
In this paper we consider hybrid automatic repeat request transmission based on binary phase shift keying modulation. Our objective is to improve the performance of the retransmissions, keeping at the same time the complexity and the performance of the first transmission unaltered.
Leszek Szczecinski, Andres Ceron, Rodolfo Feick   +2 more
openaire   +1 more source

A New Demapper for BICM System with HARQ

2009 IEEE 70th Vehicular Technology Conference Fall, 2009
In this paper, a new demapper generating log- likelihood ratio (LLR) is proposed by using a linear approxima- tion for the nonlinear factor of an exact LLR. The exact LLR is sufficient for the probability based decoding, but its calculation requires a large number of computations in the case of high order modulations such as 16 quadrature amplitude ...
Jin Whan Kang, Sang-Hyo Kim, Young Seok Jung, Seokho Yoon, Tae Hee Han   +4 more
openaire   +1 more source

AMC and HARQ: Effective capacity analysis

2016 IEEE Wireless Communications and Networking Conference, 2016
Modern wireless systems deal with the adverse and unpredictable channel conditions using two main transmission schemes considered as complimentary: adaptive modulation and coding (AMC) and hybrid ARQ (HARQ). In this work we use the effective capacity as the performance measure to evaluate different design options.
Redouane Sassioui, Leszek Szczecinski, Long Bao Le, Mustapha Benjillali   +3 more
openaire   +1 more source

HARQ based Scheduling for Wireless Network

2007 IEEE 18th International Symposium on Personal, Indoor and Mobile Radio Communications, 2007
Link adaptation, scheduling, and hybrid automatic repeat request (HARQ) are indispensable technology for wireless networks to provide high speed packet data services. While prior scheduling algorithms based on the instantaneous data rate to determine the user to be served in each scheduling interval are useful, they do not fully take into account ...
Fang Liu, Xiaoming She, Lan Chen 0004
openaire   +1 more source

On the Improved Memory Utilization in HARQ Pooling

2020 International Conference on Signal Processing and Communications (SPCOM), 2020
We consider a novel mechanism to pool HARQ (Hybrid Automatic Repeat Request) memory at the UE (User Equipment). In legacy systems, each carrier is allocated a separate section of the total HARQ memory. By pooling this memory and allocating as HARQ requests arrive, we significantly improve the memory utilization.
Satya Kumar Vankayala, Ashok Krishnan K. S., RaviTeja Gundeti, Konchady Gautam Shenoy   +3 more
openaire   +1 more source