Spectrum Analyzer Software
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Features & Benefits

RSALTE: LitePoint IQsignal™ LTE Software for Tektronix RSA3000 Series and RSA6000 Series Spectrum Analyzers
  • Support for LTE Release December 2008
    • 3GPP TS 36.211 – Version 8.5.0
    • 3GPP TS 36.212 – Version 8.5.0
    • 3GPP TS 36.213 – Version 8.5.0
  • Software Suite for 3GPP LTE Downlink (OFDMA) and Uplink (SC-FDMA) Signal Snalysis
  • Quickly Detect, Diagnose, and Resolve LTE Design Errors
  • Easy-to-Use Graphical User Interface, Running inside the RSA6000 Series or on Standalone PC
  • Supports RSA3000 Series and RSA6000 Series Spectrum Analyzers
  • Automate Measurements for System Troubleshooting and Device Stress Testing


  • Component and System R&D
  • Product Development
  • Design Verification
  • Product Debugging

Discover, Trigger, Capture, Analyze

RSALTE provides spectrum and modulation measurements on downlink (OFDMA) and uplink (SC-FDMA) signals in accordance with standard 3rd Generation Partnership Project (3GPP). The Tektronix spectrum analyzer discovers and captures intermittent events that other solutions miss, enabling engineering teams to detect, diagnose, and resolve design errors more quickly.

The revolutionary DPX® spectrum display offers an intuitive live-color view of signal transients changing over time in the frequency domain, giving you immediate confidence in the stability of your design or instantly displaying a fault when it occurs. This live display of transients is impossible with other signal analyzers. Once a problem is discovered with DPX, the spectrum analyzer can be set to trigger on the event in the frequency domain, capture a continuous time record of changing RF events and perform time-correlated analysis in all domains. You get the functionality of a high-performance vector signal analyzer, a traditional spectrum analyzer, and the unique discover-trigger-capture-analyze capability of a Real-time Spectrum Analyzer – all in a single package.

The combination of an RSA6000 Series or RSA3000 Series spectrum analyzer and RSALTE demodulation software enables you to perform the much-needed time, frequency, and modulation domain measurements to decompose signals and uncover anomalies, and generate in-depth analysis for troubleshooting LTE devices in the design stage.


RSALTE offers advanced analysis of LTE waveforms captured by the RSA Series, including EVM and spectral measurements. For example, RSALTE can easily analyze frequency-settling time and phase errors that occur during a burst transmission. Such capabilities significantly help in understanding and debugging RF performance-related issues. A PC is used to run the RSALTE analysis software and control the RSA Series through either a 10/100Base-T Ethernet or IEEE 488.2 GPIB connection. The software's application programming interface allows users to automate measurements to characterize system and device performance. RSALTE software supports Tektronix .IQT and .TIQ file formats, and LitePoint .SIG and .MOD formats.


RSALTE software supports in-band transmit analysis through a graphical display of the following tests:

  • Spectrum (PSD) and Mask
  • Symbol Constellation
  • Spectral Flatness and Delta Spectral Flatness
  • Captured Waveform Display in the Time Domain


To support product debugging, various other graphical displays are supported by RSALTE, including:

  • Phase Error versus Time
  • Frequency Error versus Time
  • CCDF (for Support Compression Analysis)
  • Spectrogram
  • EVM (versus OFDM Subcarriers and versus Time)


Besides the graphical display of measurements, RSALTE also presents relevant numerical data including:

  • EVM (All, Data, Pilots, Unmodulated)
  • Power (Peak, Average)
  • Frequency Error
  • Symbol Timing Error
  • Integrated Phase Noise
  • I/Q Imbalance (Amplitude, Phase)
  • Average of Numerical Data over Multiple Captures Can Also be Displayed


RSALTE additionally provides a wide range of compensation methods that can be used for advanced analysis of a captured signal’s sensitivity to certain impairments. For example, the available compensation methods when analyzing OFDM signals include:

  • Phase Tracking (Off, Fast)
  • Channel Estimation (Based on Averaging of the Long Training Sequence, Averaging of the Full Packet)
  • Symbol Timing Tracking
  • Frequency Synchronization (Based on Long Training Sequence or Full Packet)
  • Amplitude Tracking

The RSALTE software will auto-detect the resource allocation maps in the uplink and downlink further simplifying signal analysis. The maptool allows you to configure the LTE map such that the signal can be properly decoded. Traditionally, a map is automatically generated from data that is contained in the downlink control channel. With the maptool, you can view the map and also create/modify the map if nonstandard schemes are used. The maptool provides both symbol number and slot number views giving you more flexibility in how the data is displayed.


Downlink Map


Uplink Map



Transmitter Measurements:(LTE release December 2008 - Version 8.50)


Downlink Transmitter Measurements: OFDMA

Uplink Transmitter Measurements: SC-FDMA

EVM - for all data symbols for a frame

IQ offset

Center Frequency Error

Symbol Clock Error

Crest factor – Peak to Average Power Ratio

Power vs Time


EVM vs Carrier

EVM vs Symbol

Spectral Flatness

Spectral Flatness Difference



Frequency Error vs Symbol

Mapping/Allocation Table


Application Programming Interface (API)

The RSALTE software supports an API using the TCP/IP Interface. It is language- and platform-independent interface for controlling the RSALTE software when connected to an RSA Series. The interface allows the user to program a sequence of commands to simulate user actions in the application’s user interface.

PC System Requirements



PC Intel Pentium processor or compatible

1 GHz or higher

Operating System Microsoft Windows

(US English versions)

Windows 2000 (SP3 or higher), Windows XP (SP1 or higher)


512 MB of RAM

Disk Space    

500 MB of available hard disk space


1024 x 768 resolution


TCP/IP over 10/100Base-T Ethernet or IEEE 488.2 GPIB


Last Modified: 2011-09-30 05:00:00

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