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Xplore Articles related to Uplink

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Introduction

Radio Access Networks for UMTS: Principles and Practice, None

This chapter contains sections titled:Network ArchitectureRadio Access TechnologyStandardisation


Deep Space 1

Deep Space Communications, None

This chapter describes how the Deep Space 1 (DS1) spacecraft and the Deep Space Network (DSN) ground systems received and transmitted data. The signal to the spacecraft was at X‐band, and the signal to the ground was at X‐band or Ka‐band or both together. The chapter includes descriptions of the DSN systems used for carrier tracking, radiometric data, command transmission, ...


Performance Evaluation

LTE Advanced: 3GPP Solution for IMT-Advanced, None

None


LTE Introduction

LTE and the Evolution to 4G Wireless: Design and Measurement Challenges, None

This introductory chapter ofLTE and the Evolution to 4G Wireless ‐ Design and Measurement Challenges, Second Edition: Design and Measurement Challengesprovides an overview of the long term evolution (LTE) system, and describes the evolution of the 3GPP UMTS specifications towards LTE. High level requirements for LTE/System Architecture Evolution (SAE) and the timeline of LTE/SAE development are also discussed. The book ...


Downlink Carrier Aggregation

LTE Advanced: 3GPP Solution for IMT-Advanced, None

None


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IEEE-USA E-Books

  • Introduction

    This chapter contains sections titled:Network ArchitectureRadio Access TechnologyStandardisation

  • Deep Space 1

    This chapter describes how the Deep Space 1 (DS1) spacecraft and the Deep Space Network (DSN) ground systems received and transmitted data. The signal to the spacecraft was at X‐band, and the signal to the ground was at X‐band or Ka‐band or both together. The chapter includes descriptions of the DSN systems used for carrier tracking, radiometric data, command transmission, and telemetry reception as DS1 used them through 2001. The telecom subsystem received and demodulated uplink commands, transmits science‐ and engineering‐telemetry data on either an X‐band or a Ka‐band downlink or both, and provided coherent two‐way Doppler and range‐measurement capabilities using the X‐band uplink, and the X‐ or Ka‐band downlink. The metric data assembly (MDA) at the tracking station processed DS1 Doppler data. The operational scenarios describe the major telecom‐subsystem operating modes in the context of supporting specific phases of the mission or major mission activities and modes.

  • Performance Evaluation

    None

  • LTE Introduction

    This introductory chapter ofLTE and the Evolution to 4G Wireless ‐ Design and Measurement Challenges, Second Edition: Design and Measurement Challengesprovides an overview of the long term evolution (LTE) system, and describes the evolution of the 3GPP UMTS specifications towards LTE. High level requirements for LTE/System Architecture Evolution (SAE) and the timeline of LTE/SAE development are also discussed. The book explains design and measurement tools and techniques that engineering teams can use to accelerate turning the long term evolution (LTE) specifications into a working system. The first half of the book provides an overview of the specifications starting with RF aspects and moving through the physical layer and upper layer signaling to the system architecture evolution (SAE). The remainder of the book provides a more detailed study of the extensive range of design and measurement techniques and tools that are available to help bring LTE from theory to deployment.

  • Downlink Carrier Aggregation

    None

  • 3G Wireless Systems

    The aim of this tutorial is to provide some insight into the technical details of the different technologies that exists for 3G wireless communication. The tutorial begins with a short overview of the different technologies that exist for 3G wireless communication. This also includes an overview of the related specification and standardization activities technologies In the second part of the tutorial, a more detailed description of the different 3G wireless technologies, Wideband CDMA (WCDMA), cdma2000, and UTRA TDD, is given. The main focus is on the physical layer but some higher-layer aspects are also discussed. Next, the differences between the different 3G technologies are highlighted. The third part of the tutorial covers the evolution of 3G wireless technologies. In this part, WCDMA HSDPA, WCDMA Enhanced uplink, and cdma2000 1xEV are covered.

  • Power Control II: Control Engineering Perspective

    This chapter contains sections titled: Introduction Issues in Uplink Power Control Upper Link Power Control with a Relay Controller PID Control The Self‐Tuning Predictive Power Control Algorithm Self‐Tuning Power Control Fuzzy Power Control Handover Summary

  • Introduction to LTE‐Advanced

    None

  • Air Interface Concepts

    This chapter covers the radio aspects of long term evolution (LTE), starting with an overview of the radio frequency (RF) specifications. The chapter highlights those aspects of the LTE RF requirements that will be new compared to universal mobile telephone system (UMTS). These include issues relating to LTE's support of multiple bands and channel bandwidths as well as those RF specifications peculiar to the use of orthogonal frequency division multiple access (OFDMA) modulation on the downlink and single‐carrier frequency division multiple access (SC‐FDMA) on the uplink. The chapter describes the multi‐antenna mechanisms adopted by LTE to increase coverage and physical layer capacity. It focuses on the air interface as many of the operational details of the system are left to the designers of the evolved node B (eNB).

  • LTE‐A Radio Network

    This chapter presents the Long Term Evolution (LTE) and LTE‐Advanced radio interface. It first explains the LTE spectrum. Then, typical LTE/LTE‐A band deployment cases are discussed, with the strategies of the band use at global and regional levels, including the advanced band use. A description of the LTE multiplex in the downlink and the uplink modes, that is, OFDM and SC‐FDMA respectively, is given, followed by an explanation of the LTE/LTE‐A radio interface reporting, radio resource management, link adaptation and scheduling. Finally, details of the specific LTE‐A items are discussed, including carrier aggregation, higher‐order MIMO variants, relay nodes, coordinated multi‐point operation and HetNet concept. The LTE radio interface is based on the frequency division multiplexing technique. LTE uses OFDM (Orthogonal Frequency Division Multi‐Carrier) in the downlink, that is, in the direction from the eNodeB to the UE. Single‐carrier frequency‐division multiplexing (SC‐FDM), LTE Radio Resource Management (RRM) are also discussed.



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