Changes between Version 41 and Version 42 of Other/Summer/2015/aSDR3
- Timestamp:
- Jul 30, 2015, 5:37:02 PM (9 years ago)
Legend:
- Unmodified
- Added
- Removed
- Modified
-
Other/Summer/2015/aSDR3
v41 v42 14 14 === Objectives === 15 15 * 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// 17 17 * Transmit and Receive LTE Signal 18 18 * Apply analyzing tools, such as spectrum analyzer, GNU Radio, SNR … … 20 20 21 21 === 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. 23 23 [https://twiki.eurecom.fr/twiki/bin/view/OpenAirInterface/OpenAirDocumentation OAI Documentation] 24 24 … … 32 32 The source code 33 33 [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.34 is organized into 6 main repositories for different use cases: //OpenAir1, OpenAir2, OpenAir3, OpenAir0, OpenAirCN, Targets.// 35 35 36 36 Each repository focuses on a different data communication layer or focus of 3GPP implementation. … … 50 50 * Open-source real-time and offline Software 51 51 * Baseband DSP SIMD-x86 routines for implementing LTE UE’s and eNB’s 52 * Simulation {{{TestBenches}}}for all LTE PHY/transport channels52 * Simulation //TestBenches// for all LTE PHY/transport channels 53 53 * Sensing Localization Techniques 54 54 * PHY modeling tools … … 56 56 * Basic DSP Routines for implementing LTE specifications 57 57 * 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)'' 61 61 62 62 ===== OpenAir2 [http://svn.eurecom.fr/openair4G/releases/rel_0.1_26.10.2014/openair2/ Code] ===== 63 63 * Open-source real-time and offline Software 64 64 * 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 network66 * MAC: control access to the network medium to avoid conflicts67 * Data Framing: responsible for final encapsulation of messages into frames68 * Addressing: label information with a particular destination location69 * Error Detection and Handling65 * '''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''' 70 70 * S1 interfaces for user and control planes of the eNB, X2 Application Protocol (X2AP), and OAI network driver 71 71 … … 73 73 * Open-source Linux Software suite for cellular and MESH networks 74 74 * 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''' 75 84 76 85 ===== OpenAir0 [http://svn.eurecom.fr/openair4G/releases/rel_0.1_26.10.2014/openairITS/ Code] ===== … … 87 96 === Analyzing Tools === 88 97 ===== Spectrum Analyzer ===== 89 Hardware Spectrum Analyzer – Tektronix SA2600: 98 **//Hardware Spectrum Analyzer – Tektronix SA2600** 90 99 * Wire measurement must be connect with 30dB attenuator in order to avoid saturation 91 100 * Wireless measurement requires much higher gain than using wire … … 101 110 }}} 102 111 103 Software Spectrum Analyzer – RTLSDR Scanner: 104 * PROS:user-friendly, convenient, remote access, software-based spectrum analyzer105 * CONS:Realtek 2832 EZCap can’t tune to frequencies higher than 1.8GHz112 **//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 106 115 107 116 {{{#!html … … 121 130 ===== Signal-to-Noise Ratio (SNR) ===== 122 131 There 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. 125 134 126 135 The relationship between signal, noise, SNR:
