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Base and mobile station test instrument

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article image PSA Series spectrum analyser.

AGILENT Technologies has introduced a series of new capabilities for its PSA Series spectrum analysers.

The instruments characterise components and systems for base and mobile stations based on the TD-SCDMA (time division synchronous CDMA) and 1xEV-DV (1x evolution, data and voice) wireless access methods.

TD-SCDMA, the wireless access method, can double the traffic-carrying capacity of a wireless network. For efficiency, it uses the same frequency band for uplink and downlink transmission paths and can allocate resources for either one as needed. It also uses smart antenna technology and can simultaneously detect multiple parallel signals.

1xEV-DV is the latest revision to the cdma2000 3G access method. It increases network capacity and data rates by allowing bandwidth to be allocated on demand, and supports voice and data traffic on the same device.

The TD-SCDMA measurement personality (Option 211) for the PSA Series spectrum analysers allows designers to fully characterise the transmitted signals of TD-SCDMA base stations with a single instrument. It is suitable for design and development environments and has an intuitive user interface that makes the process fast and simple.

The standards-based power measurements for uplink and downlink signals include power versus time, transmit power, adjacent channel power, multi-channel power (up to 12 channels), as well as spurious emissions and spurious emissions masks.

The user has numerous choices within each measurement. For example, when measuring transmit power the user can display the minimum, maximum and mean values of a single burst or complete 10ms frame, and can select either RMS or log averaging.

When using spectrum emission masks (which measure spurious emissions within specific frequency bands), the designer can simultaneously display both spectrum and tabular results. Average or peak detection can be selected, and the offset frequency, reference bandwidth and limit values can be specified.

The Agilent 89601A vector signal analysis software, with troubleshooting tools for analysing many signal types, can demodulate TD-SCDMA signals. This allows the PSA Series, used with 89601A analysis software, to troubleshoot many modulation problems in addition to the TD-SCDMA power measurements provided by Option 211.

To allow characterisation of 1xEV-DV components and systems, Agilent has created new composite rho and code-domain tests that support code-domain 8PSK and 16QAM modulation techniques. The new measurement personality is available as Option 214 for the PSA Series analysers.

The 1xEV-DV measurement personality provides measurements for troubleshooting many kinds of modulation. The modulation accuracy capability shows signal quality via parameters such as composite rho, error vector magnitude, frequency error and pilot offset for one-slot signal data.

Code-domain analysis allows signal capture of up to 32 slots, while symbol-based EVM with IQ symbol constellations and other results of magnitude error, phase error, and symbol power versus time trace can reveal the root cause of signal problems.

Demodulated bits can be obtained in both binary and hexadecimal format.

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