wiki:Other/Summer/2015/aSDR3

Version 19 (modified by catle3006, 9 years ago) ( diff )

—

LTE Unlicensed (LTE-U)

Table of Contents

  1. 2015 Winlab Summer Internship
    1. Projects
    1. Indoor Localization
    2. Introduction
      1. Motivation
      2. What is ORBIT Lab?
      3. Overall Approach
      4. Resources
      5. Procedure
      6. Plan of Action
      7. Weekly Presentations
      8. Team
    1. SDR in ORBIT: Spectrum Sensing
      1. Introduction
      2. Team
      3. Objectives
      4. Weekly Progress
      5. Experiments
    1. LTE Unlicensed (LTE-U)
      1. Introduction
      2. Objectives
      3. Theory
      4. Analyzing Tools
      5. Experiments
      6. Members
      7. Materials
      8. Resources
    1. Distributed Simulation of Power Grid
      1. Introduction
      2. Objectives
      3. People
      4. Resources
    1. Context-Aware IoT Application on MobilityFirst
      1. Introduction
      2. Objectives
      3. System Architecture
      4. Network Diagram
      5. Experiment Tools
      6. Results
      7. Future Work
      8. Team member
    1. Real-Time Cyber Physical Systems Application on MobilityFirst
      1. Github Repo
      2. Introduction
      3. Preliminary Goal
      4. Outline of the Project
      5. Tasks
      6. Image Processing
      7. Weekly Summary
      8. Team
      9. Presentation Slides
    1. GNRS Assited Inter Domain Routing
      1. Introduction
    1. GNRS Management
      1. Introduction
      2. Work Milestones
    1. Effective Password Cracking Using GPU
      1. Introduction
      2. Objectives
      3. GPU
      4. Experiment
      5. Tools and Resources
  11. Body Sensor Networks
    1. Introduction
    2. Project Overview
    3. Data Collection
      1. Initial BCI data
    4. Data Analysis
    5. Tools/ Resources
    1. Unity Traffic Simulation
      1. Introduction
      2. Objectives
      3. People
    1. Mobile Security
      1. Introduction
      2. Motivation
    2. Resources
  14. Dynamic Video Encoding
    1. Introduction
    2. Goals
    3. Background Information
      1. Anatomy of a Video File
      2. What is a CODEC?
      3. H.264 Compression Algorithm
      4. Scalable Video Coding
      5. Network Emulator Test Results
      6. DASH Multi-Bitrate Encoding
      7. DASH Content Generation
      8. Bitrate Profiles
      9. Video Encoding Algorithms
      10. GPAC
    4. Presentations
    5. People

Introduction

Long-Term Evolution (LTE) is the latest high-speed data standard of wireless communication. It is usually known as 4G LTE in cellphone or mobile devices.

LTE in Unlicensed (LTE-U) operates in open/unlicensed spectrum, such as in the 5GHz band. It aggregates with the licensed LTE in order to increase the data rate of the Advanced LTE system (unlicensed and licensed LTE system).

With the massive growth in data traffic and mobile devices, it is necessary to expand the mobile network system. While the licensed spectrum is limited in amount, the possible solution should be using the available unlicensed spectrum, even it might be conflict with the exist network, such as Wi-Fi.

It is recently proposed by Qualcomm, Ericsson, and Verizon that LTE-U should be utilize in unlicensed spectrum on the 5725-5850 MHz band so that it could be a "nice neighbor" with Wi-Fi.

Objectives

First, we researched on LTE, LTE-U and Wi-Fi spectrum in advance.

Second, we simulated the LTE-U base station in ORBIT Lab using OMF commands, WiMax, and OpenAirInterface.

Third, we tested it to work together with Wi-Fi signal, and collect the result.

Theory

Figure 1. OpenAir LTE Protocol
OpenAir0
OpenAir1
OpenAir2
OpenAir3

Analyzing Tools

GNU Radio
Spectrum Analyzer
Signal-to-Noise Ratio (SNR)

There are 2 methods to approximate the SNR.

Method 1: Estimate the noise power by measure the received signal power when transmitter is turned off.

Method 2: Estimate the noise power by calculate the received signal variance.

noise = variance = mean ( signal - mean ( signal ) )

noise [dB] = 10 log (noise power)

signal [dB] = 10 log (signal power)

SNR = signal power / noise power

SNR [dB] = signal [dB] - noise [dB]

Experiments

Experiment 1:

Experiment 2:

Experiment 3:

Experiment 4:

Experiment 5:

Members

*Led by Dola Saha and Prof. Ivan Seskar

Cat Le, Electrical and Computer Engineering, Rutgers University

Demetrios Lambropoulos, Electrical and Computer Engineering, Rutgers University

Steven Cheng, Rutgers University

Materials

​Presentation: Week 1

​Presentation: Week 2

​Presentation: Week 3

​Presentation: Week 4

​Presentation: Week 5

​Presentation: Week 6

​Presentation: Week 7

​Presentation: Week 7b - OpenAirInterface

​Presentation: Week 8

Resources

​LTE Unlicensed Augmenting Mobile Data Capacity But Coexistence Needs Consideration

​U-LTE: Unlicensed Spectrum Utilization of LTE

​Extending LTE Advanced to Unlicensed Spectrum

​The Prospect Of LTE And Wi-Fi Sharing Unlicensed Spectrum

Attachments (51)

Note: See TracWiki for help on using the wiki.