Keysight Technologies N9072 W9072A cdma2000®/cdmaOne X-Series Measurement Application Demo Guide Introduction This demonstration guide provides step-by-step instructions for making key CDMA base station transmitter and component measurements. Each demonstration is given a brief description of its function and the corresponding measurement steps on the signal generator and/or signal analyzer. Demonstration Preparation The N/W9072A cdma2000/cdmaOne Product type Model number Required options measurement application provides key transmitter measurements for – 503 or 506 – frequency range to 3 GHz or analyzing cdma2000 and cdmaOne MXG vector 6 GHz systems based on the 3GPP2 signal generator N5182A (or – 651, 652 or 654 – Internal baseband generator Technical Specifications Group Note: ESG-C can E4438C) (30/60/125 MSa/s, 8 Msa memory) cdma2000 (TSG-C) specifications also be used – UNV- Enhanced dynamic range (required for better ACP performance) (C.S0010-D) for base station. Signal Studio N7601B – 3FP – N5182A connectivity for 3GPP2 All demonstrations use an X-Series V1.5.0.0 or later – EFP – Basic IS95A/cdma2000 license option signal analyzer with the N/W9072A CDMA cdma2000/cdmaOne measurement – Required: application, and an N5182A MXG – 503, 508 (507 for EXA and CXA), 513, 526, 543, N9030A PXA, vector signal generator with N7601B 544 or 550 – frequency range up to 50 GHz N9020A MXA, 3GPP2 CDMA Signal Studio software. (7.5 GHz for CXA, 26.5 GHz for EXA and MXA) N9010A EXA, or – Recommended: X-Series N9000A CXA – EA3 – Electronic attenuator, 3.6 GHz This demonstration guide describes signal analyzer Note: For PXA and – P0x – Preamplifier (P03, P08) or (P07 for CXA) how to evaluate key product features CXA, the firmware – BBA – Analog baseband IQ inputs through demonstrations and is not revision must be (required for analog baseband analysis, intended to be a detailed user’s guide. A.08.03 or later. not available on EXA and CXA) Prior knowledge of the Keysight – PFR – Precision frequency reference Technologies, Inc. products is not required for these demonstrations and X-Series N9072A – 2FP or – cdma2000/cdmaOne measurement step-by-step instructions are provided. cdma2000/ 2TP application, fixed perpetual or transportable cdmaOne license option (for PXA, MXA or EXA) measurement The demonstrations found within this W9072A – 2FP – cdma2000/cdmaOne measurement application, document assume basic knowledge application fixed perpetual license (for CXA only) of cdma2000 physical layer signal characteristics. For more in-depth Install N7601B to generate and download the Controller PC for signal waveform into the MXG via GPIB or cdmaOne and cdma2000 technical Signal Studio LAN (TCP/IP) – please refer to the online information, please visit documentation for installation and setup www.keysight.com/find/cdma2000 Keystrokes surrounded by [ ] indicate hard keys on X-Series analyzers, while key names surrounded by { } indicate soft keys located on the right edge of the X-Series display. Helpful tip: Update your instrument firmware and software to the latest version, available at www.keysight.com/find/xseries_software www.keysight.com/find/signalstudio 3 Demonstration Setup Connect the PC, X-Series, and MXG Connect a PC (loaded with N7601B Signal Studio for 3GPP2 CDMA software and Keysight I/O libraries) to the N5182A MXG via GPIB or LAN. Follow the Signal Studio instructions to complete the connection, then perform the following steps to inter- connect the X-Series and MXG (see Figure 1 for a graphical overview): A. Connect the MXG RF Output port to the X-Series RF Input port B. Recommend to connect the MXG 10 MHz Out to the X-Series Ext Ref In port (rear panel) for frequency accuracy Figure 1. Demonstration setup 4 Generate CDMA Instructions Keystrokes waveform with Signal On the MXG Studio on N5182A MXG Preset the MXG [Preset] Check the IP address. [Utility] {I/O Config} {LAN Setup} The N7601B Signal Studio software On the Signal Studio software for 3GPP2 CDMA is a Windows-based utility that simplifies the creation Double-click on the CDMA shortcut on the Run the Keysight Signal Studio desktop or access the program via the Windows of standards-based waveforms for for 3GPP2 CDMA. CDMA including 1xEV-DO. start menu To establish a new connection, click on the Verify the software is communi- {System} pull-down menu at the top of the Signal cating with the instrument via the Studio program window. Next, select {Run System GPIB or LAN (TCP/IP) link. Configuration Wizard} In the tree view, left pane of the main window, select Instrument under Hardware. Set the basic parameters of the Click the green Preset button and set: MXG vector signal generator. Frequency = 915.2375 MHz Amplitude = -10 dBm RF Output = On Delete the default IS95A Forward setup in the signal studio use the button In the tree view, left pane of the main window, Reselect the cdma2000 select WFM1. In the right pane, click button, forward signal. from the pull-down list, click on CDMA2000 Forward, See Figure 2. Click Generate and Download button on the Download the signal to top tool bar. Keysight MXG. If you encounter any errors, please refer to the online help of Signal Studio software. File > Save As > cdma2000_demo setup.scp Save the signal file for future use. (name it as you like.) Figure 2. Signal Studio’s setup of the cdma2000 forward signal 5 Demonstrations Demonstration 1: X-Series instructions Keystrokes Channel power Preset the signal analyzer [Mode Preset] [Mode]>{cdma2000} Select CDMA mode Power is the fundamental parametric Note: The exact page may vary. of any communication system. In CDMA, one of the fundamental Change frequency to 915.2375 MHz {Center Freq} [9][1][5][.][2][3][7][5] {MHz} enabling technologies is power Choose transmitter device. [Mode Setup]>{Radio}>{Device BTS} control. The accuracy of the power control system depends greatly on the Active channel power measurement. [Meas]>{Channel Power} base station’s ability to monitor and Tune on a bar graph. [View/Display]>{Bar Graph On} transmit the proper values of power. Observe the blue bar indicating the spectrum channel width and the quan- See Figure 3. Note: The X-series signal analyzer titative values given beneath. can make measurements on both the Examine setting. forward and reverse links, but only Use this step to make setup changes in [Meas Setup] the forward link will be demonstrated any measurement in this guide. In the N/W9072A, the channel power measurement determines the total rms power in a user-specified band- width. The power spectral density (PSD) is also displayed in dBm/Hz. The following power measurement parameters can be controlled: – Integration bandwidth (defaults to 1.23 MHz) – Channel power span (defaults to 1.845 MHz) – Number of trace averages (defaults to 20) – Data points displayed (101 to 20001, defaults to 1001) Figure 3. Channel power 6 Demonstration 2: An additional requirement for the The specification for measuring ACPR CDMA signal generator is that its requires a comparison of the power in Adjacent channel power ACP performance be very good. The the RF channel to the power at sev- Keysight MXG N5182A vector signal eral offsets. This can be done either The adjacent channel power measure- generator provides industry-leading as a power ratio or a power density. ment is not part of the CDMA stan- adjacent channel leakage ratio From Figure 4, the +885 kHz ACPR dards, however, individual network (ACLR) performance for wireless result would be C dBc (relative to A) equipment manufacturers typically communication1. This ensures the in power-ration method. In the power specify ACP as a figure-of-merit for power measured in the adjacent density method, the +885 kHz ACPR component testing. ACPR is the ratio channels is caused by the device results would be C/B dB. of adjacent-channel power to the under test, and not the signal average power level of the channel. generator or the signal analyzer. When testing ACPR, it is important to take into account the power statistics of the signal. A signal with a higher peak-to-average ratio may cause more interference in the adjacent channel. Thus, ACPR measurements can provide different results depending on the signal configuration. The safest approach is to use at least one of the realistic high-stress stimulus signals, and test with various combinations of Walsh-code channels. Therefore, a signal generator with this flexibility is highly recommended. Figure 4. Adjacent channel power ratio specification 1. MXG provides a superior ACLR for 3GPP W-CDMA of less than –73 dBc at +5 dBm output. 7 The N/W9072A provides the ability Set up the X-Series analyzer to analyze the CDMA signal. to perform the ACP test automatically X-Series instructions Keystrokes with method according to the specifications and displaying the Activate (ACP) measurement. [Meas]>{ACP} results. [Meas setup]>{More}> Optimize for dynamic range. – Adjust integration bandwidth {Meas Method}>{Integration BW} (defaults to 1.23 MHz) Adjust the power level by changing [AMPTD]>{Ref Value} [-10] {dBm} – Evaluate up to 6 adjacent Ref Value. channel pairs [Meas Setup]>{More 1 of 2}> {Noise Correction On Off} – Optimize dynamic range with Turn on Noise Correction. more narrower RBW selection See Figure 5. of integration bandwidth (IBW) (defaults measurement method to 30 KHz RBW) – Choose adjacent channel offset frequency, reference bandwidth, and limit values – Adjust and display both absolute and relative limits – Measure the total power in dBm or the PSD in dBm/Hz – View bar graph and/or spectrum Figure 5. ACP measurement for a cdma2000 SR1 signal 8 Demonstration 3: Set up the X-Series analyzer to analyze the CDMA signal. X-Series instructions Keystrokes Spectrum emission mask Active the spectrum emission mask The spectrum emission mask is measurement. [Meas]>{Spectrum Emission Mask} one of the in-band-of-channel Observe the mask and trace in the measurements that measures upper window and the table of See Figure 6.