【资料名称】：IEEE 802.16e WiMAX OFDMA Signal measurement

【资料作者】：Agilent

【资料日期】：NA

【资料语言】：中文

【资料格式】：PDF

【资料目录和简介】：

IEEE 802.16e WiMAX OFDMA Signal meaturements and troubleshooting.pdf

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Other Resources . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . 3
Measurement and Troubleshooting Sequence . . . . . . . . . . . . . . . . 4
Time and Frequency Domain (Vector) measurements . . . . . . . . . . . . . . . . . . . . . 5
Getting basics right and finding major problems . . . . . . .. . . . . . . . . . . . . . . . 6
Setting up basic measurements . . . . . . . . . .. . . . . . 7
Using an example recorded signal . . . . . . . . . . . . . . . . . . 7
Setting up triggering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Basic measurements of the preamble . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . 10
Time-gated spectrum . . . . . . . . . . . . . . . . . . . . . . . . . 12
Measuring subframe timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
CCDF measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Spectrograms . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Correlating a spectrogram with data bursts . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 17
Vector measurements summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Basic Digital Demodulation . . . . . . . . .. . . . . . . . . . . . 19
Understanding I/Q errors in OFDM . . . . . . . . . . . .. . . . . . . . . 20
Capturing a signal for analysis . . . . . . . . . . . . . . . . . . . 21
Two types of demodulation measurements . . . . . . . . . . . . . . . . . . . . . 22
Downlink modulation quality measurements of a uniform signal . .. . . 23
Downlink modulation quality measurements of a burst (nonuniform) signal . . . . 29
OFDMA Signal Maps. . . . . .. . . . . . . . . . . . . . . . . . . . . 31
Uplink modulation quality measurements of a uniform signal. . . . . . . . . . . . . . . 35
Uplink modulation quality measurements of a burst (nonuniform) signal . . . . . . 39
Common problems and troubleshooting approaches for “uniform” measurements . . . 41
Common problems and troubleshooting approaches for “data burst” measurements . . 42
Advanced Digital Demodulation . .. . . . . . . . . . . 43
Advanced displays. . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Pilot tracking . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Symbol timing adjustment . .. . . . . . . . . . . . . . . . . . . . . . . . . . 49
Time-specific and frequency-specific measurements . . . . . . . . . . . . . . .. 49
Customizing a Zone Definition Grid map for measuring individual data regions. . . . . . 50
Measuring specific time or symbol intervals . . .. . . . . . . . . 55
Measuring a specific subcarrier or range of subcarriers . . . . . . . . . . . . . . . . 58
Summary . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Resources . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Support, Services, and Assistance . . . . . . . . . . . . . . . . . . . . . 62