Results 221 to 230 of about 1,852,147 (258)

Hybrid ARQ-Based Fairness Enhancement in Uplink WLAN

IEEE Transactions on Wireless Communications, 2018
Per-station fairness is one of the important and challenging issues in wireless local area network based on a contention-based medium access control protocol.
Jay H. Kim, Seong Hwan Kim, D. Sung
semanticscholar   +1 more source

Punctured vs Rateless Codes for Hybrid ARQ

2006 IEEE Information Theory Workshop, 2006
Two incremental redundancy hybrid ARQ (IR-HARQ) schemes are compared: one is based on LDPC code ensembles with random transmission assignments, the other is based on recently introduced Raptor codes. A number of important issues, such as rate and power control, and error rate performance after each transmission on time varying binary-input, symmetric ...
Emina Soljanin, Nedeljko Varnica, Philip Whiting   +2 more
openaire   +1 more source

Convolutional code and hybrid ARQ

[Proceedings 1992] IEEE International Conference on Systems Engineering, 2003
Hybrid automatic repeat request (ARQ) combined with the convolutional code is considered, and it is shown how one can realize reliable transmission near the computational cutoff rate. Particular attention is given to a hybrid ARQ and burst trapping scheme for error detection. Some results of simulation over the additive white Gaussian noise channel are
openaire   +1 more source

A BICM Approach to Type-II Hybrid ARQ

2006 IEEE International Conference on Acoustics Speech and Signal Processing Proceedings, 2006
We propose a low complexity H-ARQ utilizing Bit Interleaved Coded Modulation (BICM). Our aim is to improve the reliability and bandwidth efficiency of wireless communications using high rate H-ARQ enabled by the proposed BICM option. This type-II hybrid ARQ generates incremental redundancy and diversity by varying the bit-to-symbol mapping during ...
Jeremy Roberson, Zhi Ding 0001
openaire   +1 more source

Coded Modulation for Hybrid ARQ with Mapping Rearrangement

2008 IEEE International Conference on Communications, 2008
In this work, we propose and analyze coded modulation (CM) schemes suitable for mapping rearrangement (MaRe) in Hybrid ARQ (HARQ). Two known MaRe schemes for 16-ary quadrature amplitude modulation (16-QAM) are first studied. We demonstrate that the performance of the studied CM receiver is intrinsically limited by the MaRe design and we propose ...
Mustapha Benjillali, Leszek Szczecinski
openaire   +1 more source

Performance Analysis of Hybrid-ARQ Characteristics in HSDPA

Wireless Personal Communications, 2006
This paper describes network level simulation results for Enhanced UMTS. High-Speed Downlink Packet Access (HSDPA) enhances both the capacity and the peak rate of WCDMA-based systems. Link adaptation and Hybrid-Automatic Repeat reQuest (H-ARQ) are two key functions creating these enhancements.
Irene de Bruin, Frank Brouwer, Neill Whillans, Yusun Fu, Youqian Xiao   +4 more
openaire   +1 more source

Hybrid ARQ transmission and combining for MIMO systems

IEEE International Conference on Communications, 2003. ICC '03., 2004
In this paper, we investigate several possibilities to increase the efficiency of hybrid automatic retransmission request (HARQ) for multi-input multi-output (MIMO) systems. At the receiver side, two HARQ combining schemes, namely pre-combining and post-combining, are discussed and analyzed. We show that pre-combining is superior to post-combining.
Eko N. Onggosanusi, Anand G. Dabak, Yan Hui, Gibong Jeong   +3 more
openaire   +1 more source

Hybrid-ARQ Interference Channels with Receiver Cooperation

2010 IEEE International Conference on Communications, 2010
A two-user uplink interference channel with hybrid automatic retransmission request (HARQ) and base station cooperation is analyzed. Two forms of base station cooperation are studied: wireless and wireline cooperation. In wireless cooperation, the first base station that decodes its desired user's message acts as a relay for the co-channel user via ...
openaire   +1 more source

Performance Bounds on Turbo Coded Hybrid ARQ

2007 IEEE 66th Vehicular Technology Conference, 2007
In this paper, based on the transfer function bounding techniques for turbo codes, we propose performance bounds on turbo coded hybrid automatic repeat request (TC-HARQ) under additive white Gaussian noise (AWGN) channel. The bounds for both Type-I TC-HARQ and segment selective repeat (SSR)-based TC-HARQ are developed in terms of bit error rate (BER ...
Tao Shi, Lei Cao
openaire   +1 more source

A new relay assisted Hybrid ARQ scheme

2010 International Conference on Wireless Communications & Signal Processing (WCSP), 2010
In this paper, we propose a new relay assisted Hybird-ARQ scheme where the two transmitting nodes (source and relay) and the two received signals (from first transmission and retransmission) are viewed as a virtual MIMO and thus the source can send new codeword when the relay is retransmitting the old codeword.
Zhili Zhang, Hongwen Yang, Liyun Dai
openaire   +1 more source