Changes between Version 41 and Version 42 of Other/Summer/2015/aSDR3


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Timestamp:
Jul 30, 2015, 5:37:02 PM (9 years ago)
Author:
catle3006
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  • Other/Summer/2015/aSDR3

    v41 v42  
    1414=== Objectives ===
    1515* Research on wireless communications, LTE, LTE-U and Wi-Fi in advance
    16 * Simulate the LTE-U base station in ORBIT Lab using OMF commands, {{{WiMax}}}, and {{{OpenAirInterface}}}
     16* Simulate the LTE-U base station in ORBIT Lab using OMF commands, //WiMax//, and //OpenAirInterface//
    1717* Transmit and Receive LTE Signal
    1818* Apply analyzing tools, such as spectrum analyzer, GNU Radio, SNR
     
    2020
    2121=== Theory ===
    22 {{{OpenAirInterface}}} (OAI) is open-source based experimental research. It allows to simulate the digital communication environments, such as LTE.
     22**//!OpenAirInterface** (OAI) is open-source based experimental research. It allows to simulate the digital communication environments, such as LTE.
    2323[https://twiki.eurecom.fr/twiki/bin/view/OpenAirInterface/OpenAirDocumentation OAI Documentation]
    2424
     
    3232The source code
    3333[http://svn.eurecom.fr/openair4G/releases/rel_0.1_26.10.2014/ OpenAir4G]
    34 is organized into 6 main repositories for different use cases: OpenAir1, OpenAir2, OpenAir3, OpenAir0, OpenAirCN, Targets.
     34is organized into 6 main repositories for different use cases: //OpenAir1, OpenAir2, OpenAir3, OpenAir0, OpenAirCN, Targets.//
    3535
    3636Each repository focuses on a different data communication layer or focus of 3GPP implementation.
     
    5050* Open-source real-time and offline Software
    5151* Baseband DSP SIMD-x86 routines for implementing LTE UE’s and eNB’s
    52 * Simulation {{{TestBenches}}} for all LTE PHY/transport channels
     52* Simulation //TestBenches// for all LTE PHY/transport channels
    5353 * Sensing Localization Techniques
    5454 * PHY modeling tools
     
    5656 * Basic DSP Routines for implementing LTE specifications
    5757* Sounding Software, Physical (PHY) Abstraction Software, and Channel Simulation
    58  * Eurecom’s Multi-Input Multi-Output (MIMO) {{{OpenAir}}} Sounder (EMOS - Sounding Software) allows multiuser MIMO channel measurements in real time and store measurements from both user equipment(UE) and evolved NodeB(eNB)
    59  * PHY Abstraction Software contains all real-time/simulation signal processing, unitary {{{TestBenches}}} for the different channel coders and decoders, and modulation/demodulation (includes FFT/SC-FDMA front-end processing)
    60  * Channel Simulation Software contains simulation routines to test PHY, and {{{TestBenches}}} for unitary simulation of physical channels, and full system simulation, such as PHY, MAC (medium access control), RLC (radio link control), RRC (radio resource control), PDCP (packet data convergence protocol)
     58 * '''Eurecom’s Multi-Input Multi-Output (MIMO) //OpenAir// Sounder (EMOS - Sounding Software)''' ''allows multiuser MIMO channel measurements in real time and store measurements from both user equipment(UE) and evolved NodeB(eNB)''
     59 * '''PHY Abstraction Software''' ''contains all real-time/simulation signal processing, unitary //TestBenches// for the different channel coders and decoders, and modulation/demodulation (includes FFT/SC-FDMA front-end processing)''
     60 * '''Channel Simulation Software''' ''contains simulation routines to test PHY, and //TestBenches// for unitary simulation of physical channels, and full system simulation, such as PHY, MAC (medium access control), RLC (radio link control), RRC (radio resource control), PDCP (packet data convergence protocol)''
    6161
    6262===== OpenAir2 [http://svn.eurecom.fr/openair4G/releases/rel_0.1_26.10.2014/openair2/ Code] =====
    6363* Open-source real-time and offline Software
    6464* Contains LTE MAC (36-213), RLC (36-322), PDCP (36-323), and two RRC implementations
    65  * LLC: establish/control logical links between local devices on a network
    66  * MAC: control access to the network medium to avoid conflicts
    67  * Data Framing: responsible for final encapsulation of messages into frames
    68  * Addressing: label information with a particular destination location
    69  * Error Detection and Handling
     65 * '''LLC''' ''establishes/controls logical links between local devices on a network''
     66 * '''MAC''' ''controls access to the network medium to avoid conflicts''
     67 * '''Data Framing''' ''is responsible for final encapsulation of messages into frames''
     68 * '''Addressing''' ''labels information with a particular destination location''
     69 * '''Error Detection and Handling'''
    7070* S1 interfaces for user and control planes of the eNB, X2 Application Protocol (X2AP), and OAI network driver
    7171
     
    7373* Open-source Linux Software suite for cellular and MESH networks
    7474* Provides scripts and adaptations for the Linux networking suite
     75* Contains OAI-MME (Mobility Management Entity), which is responsible for authentication of the mobile devices
     76 * '''Network Access Control''' ''manages authorization for UEs, allow to gain IP connectivity''
     77 * '''Radio Resource Management''' ''decides radio resource management strategy (RRM)''
     78 * '''Mobility Management''' ''provides seamless inter-working with multiple use cases such as Inter-eNB''
     79 * '''Roaming Management''' ''supports outbound/inbound roaming subscriber''
     80 * '''UE Reach-ability''' ''manages communication with the UE and HSS''
     81 * '''Tracking Area Management''' ''allocates tracking area identity list to UE''
     82 * '''Lawful Intercept'''
     83 * '''Load Balancing Between S-GWs'''
    7584
    7685===== OpenAir0 [http://svn.eurecom.fr/openair4G/releases/rel_0.1_26.10.2014/openairITS/ Code] =====
     
    8796=== Analyzing Tools ===
    8897===== Spectrum Analyzer  =====
    89 Hardware Spectrum Analyzer – Tektronix SA2600:
     98**//Hardware Spectrum Analyzer – Tektronix SA2600**
    9099* Wire measurement must be connect with 30dB attenuator in order to avoid saturation
    91100* Wireless measurement requires much higher gain than using wire
     
    101110}}}
    102111
    103 Software Spectrum Analyzer – RTLSDR Scanner:
    104  * PROS: user-friendly, convenient, remote access, software-based spectrum analyzer
    105  * CONS: Realtek 2832 EZCap can’t tune to frequencies higher than 1.8GHz
     112**//Software Spectrum Analyzer – RTLSDR Scanner**
     113 * '''PROS''' user-friendly, convenient, remote access, software-based spectrum analyzer
     114 * '''CONS''' Realtek 2832 EZCap can’t tune to frequencies higher than 1.8GHz
    106115
    107116{{{#!html
     
    121130===== Signal-to-Noise Ratio (SNR)  =====
    122131There are 2 methods to approximate the SNR:
    123 * Method 1:  Estimate the noise power by measuring the received signal power when transmitter is turned off.
    124 * Method 2: Estimate the noise power by calculating the received signal variance.
     132* '''Method 1:'''  Estimate the noise power by measuring the received signal power when transmitter is turned off.
     133* '''Method 2:''' Estimate the noise power by calculating the received signal variance.
    125134
    126135The relationship between signal, noise, SNR: