The use of Hybrid Automatic Repeat reQuest (HARQ) for error correction has been given wide attention in the High Speed Downlink Packets Access (HSDPA) mode of the UMTS (3GPP TR 25.848 2001). This paper derives a theoretical analysis of the performance of Automatic Repeat reQuest (ARQ) and Type I Hybrid ARQ (HARQ I) over a block multipath Rayleigh fading channel. It is shown that the derived ana...

We consider a half-duplex wireless relay network with hybrid-automatic retransmission request (HARQ) and Rayleigh fading channels. In this paper, we analyze the outage probability of the multirelay delay-limited HARQ system with opportunistic relaying scheme in decode-and-forward mode, in which the best relay is selected to transmit the source’s regenerated signal. A simple and distributed rela...

OFDM, MC-CDMA and DS-CDMA are being researched vigorously as the prospective signaling technique for the next generation mobile communications systems, which will be characterized by the broadband packet technology. With packet transmissions, hybrid ARQ (HARQ) will be inevitable for error control. HARQ with rate compatible punctured turbo (RCPT) codes is one of the promising techniques. Data ra...

In this paper, a multiple-input-multiple-output (MIMO) hybrid-automatic repeat request (HARQ) algorithm based on antenna scheduling is proposed. It retransmits the packet using the scheduled antennas according to the state of the communication link, instead of retransmitting the packet through the same antennas. The proposed MIMO-OFDM HARQ system based on antenna scheduling is shown to be super...

Recently, semantic communication has been brought to the forefront because of its great success in deep learning (DL), especially Transformer. Even if successfully applied sentence transmission reduce errors, existing architecture is usually fixed codeword length and inefficient inflexible for varying length. In this paper, we exploit hybrid automatic repeat request (HARQ) error further. We fir...

This paper presents an analytical model of a cross-layer communication system to enable improvement in the Transmission Control Protocol (TCP) over mixed wired and wireless Internet. The focus is on the quantitative performance evaluation of the interactions between TCP NewReno and a hybrid Automatic Repeat reQuest protocol (HARQ) in the link layer (LL) with a finite buffer size. The significan...

Mobile communication systems have been adopting link adaptive transmission schemes such as adaptive modulation and coding (AMC) and hybrid-ARQ (HARQ). Several wireless mobile communication systems have considered highly efficient incremental redundancy (IR) hybrid ARQ scheme. However IR-HARQ with LDPC codes has not been specified yet. In this paper, we propose an IR-HARQ scheme with rate compat...

In this paper, we present a novel hybrid automatic repeat request (HARQ) scheme for cooperative communication systems, called cooperative partial retransmission (CPR). The method is based on the retransmission of only a fraction of the original code word by the cooperating nodes. Based on the outage analysis, we derive the theoretical throughput expressions that are compared to numerical simula...

In this paper, we carry out a performance evaluation of multiple-input multiple-output (MIMO) and Hybrid automatic repeat request (HARQ) techniques for singlecarrier frequency division multiple access (SCFDMA) of the LTE uplink system. Different MIMO schemes such as singleantenna port (SISO or SIMO), transmit diversity (TD) and spatial multiplexing (SM) are described and simulated. In this pape...

Cooperative hybrid-ARQ (HARQ) protocols, which can exploit the spatial and temporal diversities, have been widely studied. The efficiency of cooperative HARQ protocols is higher than that of cooperative protocols, because retransmissions are only performed when necessary. We classify cooperative HARQ protocols as three decode-and-forward based HARQ (DF-HARQ) protocols and two amplified-and-forw...