802.11a/g/j/p OFDMOrthogonal Frequency Division Multiplexing: OFDM employs multiple overlapping radio frequency carriers, each operating at a carefully chosen frequency that is Orthogonal to the others, to produce a transmission scheme that supports higher bit rates due to parallel channel operation. OFDM is an alternative tranmission scheme to DSSS and FHSS. Modulation Analysis (Option B7R) adds Orthogonal Frequency Division Multiplexing demodulation capability to your 89600 Vector Signal Analysis application software. Option B7R performs modulation analysis on OFDM modulated signals using standard OFDM formats.
While providing demodulation capabilities for standard OFDM formats, option B7R also provides the flexibility to measure nonstandard OFDM formats. The VSA's demodulator parameters are user-definable, giving the flexibility to customize the VSA for measuring non-ideal signals. User-definable parameters include subcarrier modulation format and spacing, symbol timing , burst synchronization, and error correction (see 802.11a/g/j/p Demod Properties).
The digital demodulator used in this VSA incorporates advanced technology that does not require external filtering, coherent carrier signals, or symbol-clock timing signals to lock-on to the measured signal. Signal locking requires these parameters to be set properly: center frequency, guard interval, subcarrier spacing, and search length.
Along with the typical digital demodulation measurement results, several additional OFDM unique display formats and numeric error data results enhance data analysis. These include, , , , and trace data (see Available Trace Data. Flexible display scaling and marker functionality help make accurate and quick measurements.
Display measurement data for only one OFDM subcarrier at a time (using the Carrier-to-Analyze parameter) or for selected data regions (using theand offset parameters). These features provide a tremendous tool for signal analysis and troubleshooting (see Result Length).
The VSA uses the measured signal (called) to generate an ideal signal (called ). Many and trace data formats and numeric error trace data are computed and available for data display and analysis. This data can be used to quantify and locate errors in the signal, see About the Symbol Table.
Available Features (802.11a/g/j/p OFDM)
Setting up an 802.11a/g/j/p Measurement
802.11a/g/j/p Demod Properties
About the Symbol Table (802.11a/g/j/p OFDM)
Available Trace Data (802.11a/g/j/p OFDM)
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