Sökning: "HARQ Systems"
Visar resultat 1 - 5 av 8 avhandlingar innehållade orden HARQ Systems.
1. HARQ Systems: Resource Allocation, Feedback Error Protection, and Bits-to-Symbol Mappings
Sammanfattning : Reliability of data transmission is a fundamental problem in wireless communications. Fading in wireless channels causes the signal strength to vary at the receiver and this results in loss of data packets. To improve the reliability, automatic repeat request (ARQ) schemes were introduced. LÄS MER
2. Ultra-Reliable Short-Packet Communications: Fundamental Limits and Enabling Technologies
Sammanfattning : The paradigm shift from 4G to 5G communications, anticipated to enable ultra-reliable low-latency communications (URLLC), will enforce a radical change in the design of wireless communication systems. Unlike in 4G systems, where the main objective is to provide a large transmission rate, in URLLC, as implied by its name, the objective is to enable transmissions with low latency and, simultaneously, very high reliability. LÄS MER
3. Predictor Antenna Systems: Exploiting Channel State Information for Vehicle Communications
Sammanfattning : Vehicle communication is one of the most important use cases in the fifth generation of wireless networks (5G). The growing demand for quality of service (QoS) characterized by performance metrics, such as spectrum efficiency, peak data rate, and outage probability, is mainly limited by inaccurate prediction/estimation of channel state information (CSI) of the rapidly changing environment around moving vehicles. LÄS MER
4. Data Transmission in the Presence of Limited Channel State Information Feedback
Sammanfattning : .... LÄS MER
5. Towards Context Information-based High-Performing Connectivity in Internet of Vehicle Communications
Sammanfattning : Internet-of-vehicles (IoV) is one of the most important use cases in the fifth generation (5G) of wireless networks and beyond. Here, IoV communications refer to two types of scenarios: serving the in-vehicle users with moving relays (MRs); and supporting vehicle-to-everything (V2X) communications for, e.g., connected vehicle functionalities. LÄS MER