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Software
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Production Testing Mode The station provides traditional RF tests, including RF gain, gain flatness, image rejection, noise figure, input third order products, spurious, leakage and sideband signals, adjacent channel interference, filters quality, P-1dB compression, current drained, phase noise, and etc. Further, the system has many product-specific tests, such as modulation spectral regrowth, OFDM notch clarity, transmission and reception inter-switching time, I/Q port amplitude and phase imbalance, and product chip register operation. These tests are grouped for configuring on different carrier channels, frequency bands, and amplification levels. It is possible to setup more than 1 thousand testing points, which is impossible to be tested manually. Due to the computer dynamical control, the testing time decreases and the accuracy increases.
Engineering Evaluation Mode The test system is designed as a developing environment. Our software gives the user the control on the functions of all the testing instruments. Moreover, the RF path on different instruments and different channels of the product is built up on ASCOR switch controller, which is driven by GPIB interface. We also give the user the ability to setup each switch position by user interface. The user can setup the path by give the control on individual switch. It is flexible to probe signal in the middle of the paths. Any individual instrument has a GUI with the basic setup functions. For example, user can generate different standard complex waveforms under the IEEE802.11ab protocols on Agilent VSG4438C generator with the option 405 and 410. The complex waveforms are sent out from both the RF port and I/Q quadrant ports. User is allowed to adjust the frequency and power levels on the waveforms. It is also possible to setup notch location on the waveforms. Further it is able to manually configure the DUT registers. The design is access to any register from the user interface. Virtual Test Station Inter-relationship The software is designed into different operation levels, user applications, instrument utilities, and instrument drivers. The levels are connected together. User applications offer simplified applicative operations to users. At this level, users deal with GUI panels. Multiple operational utilities are grouped together to complete a whole task. The detailed result of the entire action is responded back to the users on the GUI panel immediately.
At the utility level, module functions contain the basic single commands. A utility function controls the one driver command and reflects the action and result on the GUI display. All the panels are updating the latest information together at the same time when the command is executed. The instrument driver is the lowest interface directly connecting with instrument. It is responsible for communicating with instrument at the machine level. We utilize GPIB, RS-232, VXI and other standard interface to the instruments. Phase Measurement with Oscilloscope Card Analog signals' phase measurement is an important utility in the project, because the tests are involving the I/Q signal characteristics checking for both the transmission and reception processes. For the purpose of simplification, the system fundamentally uses two CW signals on the I/Q ports of the testing device. With the careful design on the custom interface board, the two I/Q traversal paths are of the equal length. Both the signals are feed into the two input channels of NI-5112 oscilloscope card. Multiple data analysis functions are used to calculate the comparison on both the signal characteristics. On the application main control panel, the output signal analysis result is prompted to the user. The vector analyzer block displays the on-time amplitude and phase difference between the I and Q signals at a certain frequency.
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At the deeper instrument utility level, we provide an oscilloscope control panel to the user. It contains the basic setting for an oscilloscope with up to four input channels. The GUI is designed to be application-oriented and suitable for any oscilloscope equipment. | |||
| In this project, we deploy NI-5112 Oscilloscope
data acquisition card. Most of the functions of the instrument
are realized from the panel, including horizontal setting,
vertical setting, trigger setup, waveform acquisition, and
etc.
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For the further signal analyzing, We also provide a detail analog signal analysis panel for comparing two waveforms. With the complex analysis mathematical functions, the DC offsets, amplitudes, RMS, and phases of the waveforms are calculated. | |||
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Vector Signal Generator IEEE 802.11b has the feature of direct sequence spread spectrum technology using complementary code keying (CCK). IEEE802.11a use the technology of orthogonal frequency division multiplexing (OFDM) with QAM or QPSK modulation schemes. Changing both the frequency span factor and/or the modulation format varies the bit rate. The Agilent VSG-4438C vector signal generator has the latest complex signal generation option. With the Agilent application Signal Studio, we can build up any spectrum waveforms based on IEEE802.11a/b protocols, such as OFDM full channel span, lower notch spectrum span, CCK spectrum span, and etc.
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With the option 002: ARB and Real-time generator, VSG-4438C also allows the user to load user-defined complex spectrum signals into the generator. | |||
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An application on the vector signal generator is provided to the user. With this control GUI, the user can generate not only the basic CW signals, but complex spectrum signals as well. Even the user can save the load-in waveform into instrument build-in disk, adjust the I/Q signal characteristics, and individual I or Q signal amplitude, DC offset, and phase difference. | |||
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