Agilent Technologies N1911A Manuel d'utilisateur

Agilent P-Series Power MeterN1911A/N1912A IEEE 802.16 WiMAXMeasurement ApplicationTechnical Overview with Self-Guided DemonstrationThe P-Series power

10Setup Downlink (DL) profi le in TDD mode.Step-by-step to create mobile WiMAX waveform profi le. Most parameters are in default setting when Signal Stu

11Demonstration Preparation (continued)Instructions Software operations6. Confi gure MAC messaging. • Auto DL-MAP = off• Modulation and coding = QPSK

12Power vs. Time (PvT)This measurement examines time domain burst structure and make mea-surements over certain subframes. P-Series power meter real t

13Measuring Preamble and DLInstructions KeystrokesOn the P-Series:1. Measure Preamble at 104 µs duration (See Figure 11).{Trace Control}, {X Start

14Instructions KeystrokesOn the P-Series:1. Measure the TTG, UL & RTG at 2.84 ms duration (See Figure 13).Press [] to allocate marker 2 and []

15Power Statistics CCDFMeasurement setup parameters:• Set a reference trace, compare to Gaussian noise traceCCDF is generally measured with data tha

16Figure 16 Waveform CCDF calculates CCDF and peak-to-average ratio using the entire waveform, including portions where the data is at

17Setup the Uplink (UL) profi le in TDD modeInstructions Software operationsOn the Signal Studio for 802.16 WiMAX software1. Confi gure the waveform se

18Figure 18 WiMAX waveform duration 5 ms for UL in TDD mode Figure 19 Frame duration (5 ms) of UL waveform captured from Signal Studio

19Figure 20 UL average power measures –0.04 dBm at 1.83 ms duration Figure 21 RTG, Preamble, DL & TTG at 3.16 ms dura

2IntroductionThis technical overview is intended for engineers who are familiar with the IEEE 802.16 (WiMAX) and wish to make effective power-time mea

20Setup the both Downlink & Uplink profi le in TDD mode Instructions Software operationsOn the Signal Studio for 802.16 WiMAX software: 1. Confi gu

21Instructions KeystrokesOn the P-Series:1. Select the WiMAX predefi ned preset value.[Preset], press [ or ] key to choose {WiMAX}. [Select]

22Measuring the Preamble Instructions KeystrokesOn the P-Series:1. Measure the Preamble at 104 µs duration (See Figure 24).Press [ ]

23Figure 26 UL average power measures –4.24 dBm at 1.28 ms duration where Burst 1 is ON only Measuring the UL

24Figure 28 RTG at 965 µs durationMeasuring the RTG Instructions KeystrokesOn the P-Series:1. Measure the RTG at 957 µs duration (Se

25Ordering InformationP-Series power meter ordering information.For further information, refer: P-Series Power Meters and Power Sensors Confi guration

Remove all doubtOur repair and calibration services will get your equipment back to you, performing like new, when promised. You will get full value o

3WiMAX OverviewWiMAX (worldwide interoperability for microwave access) is based on wire-less transmission methods defi ned by the IEEE 802.16 standard.

4OFDM/OFDMA SubcarriersThe WiMAX’s specifi cations for the 256-carrier OFDM PHY defi ne three types of subcarriers: data, pilot, and null. 200 carriers

5Modulation TypeThe IEEE 802.16-2004 standard defi nes a set of adaptive modulation and coding (AMC) rate confi guration that can be used to trade off d

6Figure 5 Various duplexing techniques (TDD, FDD and H-FDD)Duplexing TechniquesWiMAX systems can be deployed as Time Division Duplexing (TDD), Frequ

7Output PowerTransmit power level is an important IEEE 802.16 conformance specifi ca-tion. This is defi ned as the time-aver-aged power during the usefu

Demonstration PreparationThe following instruments and soft-ware are required in order to perform these demonstrations:• Agilent ESG E4438C or MXG N5

Signal Studio N7615A/B for 802.16 WiMAX is a Windows based utility that simplifi es the creation of standards-based or customized 802.16 WiMAX waveform