Hybrid automatic repeat request (HARQ) is the well-known technique to improve the system throughput and link performance in wireless communication systems. It can also be applied together with the cooperative communication, which provides a new way of exploiting the spatial diversity. Firstly, we present the analytical framework of decodeand-forward (DF) relaying systems with the general hop-by...

A new hybrid automatic repeat request (HARQ) scheme for multicast service for wireless sensor networks is proposed in this study. In the proposed algorithm, the HARQ operation is combined with an autonomous retransmission method that ensure a data packet is transmitted irrespective of whether or not the packet is successfully decoded at the receivers. The optimal number of autonomous retransmis...

In this article, we consider the massive nonorthogonal multiple access (NOMA) with a hybrid automatic repeat request (HARQ) for short packet communications. To reduce latency, each user can perform one retransmission provided that previous was not decoded successfully. The system performance is evaluated both coordinated and uncoordinated transmissions. We first develop Markov model (MM) to ana...

Nonbinary type-I1 hybrid ARQ (HARQ), which combines shortened Reed-Solomon (RS) code with ARQ, is proposed. Its throughput is obtained by extending Lin and Yu's analysis of binary type-I1 HARQ. Analytical results show that nonbinary HARQ outperforms its binary counterpart in throughput over Rayleigh fading channels when the modulation scheme and the FEC subsystem are selected properly. I . I N ...

In order to fulfill the stringent Ultra-Reliable Low Latency Communication (URLLC) requirements towards Fifth Generation (5G) mobile networks, early-Hybrid Automatic Repeat reQuest (e-HARQ) schemes have been introduced, aimed at providing faster feedback and thus earlier retransmission. The performance of e-HARQ prediction strongly depends on classification mechanism, data length, threshold val...

Delivering timely status updates in a timeliness-critical communication system is of paramount importance to assist accurate and efficient decision making. Therefore, the topic analyzing Age Information (AoI) has aroused new research interest. This paper contributes results this area by systematically AoI two types Hybrid Automatic Repeat reQuest (HARQ) techniques that have been newly standardi...

Predictor antenna (PA) system is referred to as a with two sets of antennas on the roof vehicle, where PAs positioned in front vehicle are used predict channel state observed by receive (RAs) that aligned behind PAs. In this letter, we study effect spatial mismatch accuracy information estimation, and analyze delay-constrained average rate hybrid automatic repeat request (HARQ)-based PA systems...

A Hybrid Automatic Repeat reQuest (HARQ), error control scheme based on a convolutional code for packet transmission over wireless channels was proposed. The analysis of the throughput and bit-error rate (BER) performance, according to the different constraint lengths (K=3 and K=4) and code rate (1/2 and 1/3) of convolutional codes on HARQ type I simulation scheme are presented. Certain error c...

This paper addresses the combination of Hybrid Automatic Retransmission Request (HARQ) processing with multiple input multiple output (MIMO) data transmission. The objective is twofold. First, we evaluate a reliable throughput performance metric that composes MIMO as well as HARQ protocol parameters in a single expression. Due to its generic property, this metric can be used by higher layer pro...

Throughput is an important performance measure for data communications over a wireless channel. Orthogonal frequency division multiplexing (OFDM) with hybrid automatic repeat request (HARQ) achieves a good throughput performance over a frequency-selective fading channel. In OFDM with HARQ, however, during the first transmission uncoded information packet is transmitted. Consequently, the channe...