Sample test and measurement of digital wireless system

Abstract: the sample testing and measuring information of digital wireless system produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Along with the industry to 2. 5 g and 3 g system upgrade, today power amplifier designers face new design challenges. Hybrid system recommended that service providers will be support under the condition of existing infrastructure smoothly transition to 3 g system. This combination carrier. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a sample test and measurement of digital wireless system for details. Along with the industry to 2. 5 g and 3 g system upgrade, today power amplifier designers face new design challenges. Hybrid system recommended that service providers will be support under the condition of existing infrastructure smoothly transition to 3 g system. This combination of multi-carrier and multiple system can be used to reduce the system cost, to meet the requirements of data services and expand market coverage. The next generation wireless software defined radio ( SDR) Is the ability to promote the change of technology. Under the condition of multi-carrier and multiple modulation scheme, amplifier designers encountered more difficulties in the test performance. It is also required in the test and measurement using the new architecture. In 3 g system to realize the software defined radio, designers must first in the test was carried out on the amplifier performance in the first test in the laboratory on the amplifier performance thorough tests in the laboratory. To effectively do this, must adopt zui new modular test and measurement configurations. This article discusses the modular solution to make full use of the high linearity analog-to-digital converters ( D / A) Level, GB memory and broadband rf (solid RF) The advantages of up/down converter. Therefore, in the laboratory and production test can provide very real test condition. The new test method was used in comprehensive simulation actual cumulative distribution function ( CCDF) ； Produce more carrier and standard signal; Provide signal spectrum is very pure. Can be testing a new digital linearization technique, which testified to improve the effectiveness of the new algorithm can power amplification device. Industry to adopt these new amplifier design requires more complex with modular structure of signal test equipment. Amplifier test in the past, the measurement of power amplifier is usually based on the same phase and quadrature ( 智商) Signal generator of the modulator. Such instruments zui early is for single carrier and optimization, in order to meet the needs of the multicarrier measurement extension. Characterized by double D/A converter analog IQ modulation circuit and wave type memory. Its function of single standard test is enough. But this kind of generator ( See figure 1) Has intrinsic limitations, it was also the restrictions to base design personnel and USES the concept of software defined radio base station design. IQ structure on the I and Q baseband part, the definition of the phase shift amplitude imbalance and DC bias caused by the channel imbalance is very sensitive. When the multi-carrier frequency relative to the rf asymmetric load, IQ become harder to optimize structure. Signal is easy to drift, the need for manual adjustments, so you need to constantly repeated adjust operator. All of these imbalances will create a disturbance, the output power and the adjacent carrier ( 机场核心计划) Can't reach the zui state. And for the power amplifier test, adjust the adjacent carrier power ratio ( ACPR） Achieve zui better performance is very important. Test platform adopts the concept of software defined radio as a foundation for the structure of the vector signal generator, can eliminate the current generator based on IQ has many shortcomings. This concept USES A single D/A converter and an intermediate frequency ( 如果) To the radio frequency ( RF) The frequency conversion chain ( See figure 2) 。 It mimics the structure zui new base station design. After D/A converters increase the GB byte level of memory can make the happening of the test signal with almost unlimited flexibility. To have the ability to generate more load/standard signal, and record and play back the scene of the actual spectrum. This kind of hardware and intuitive & other; The vector signal simulation & throughout; Combined with the software, the test engineers and product developers to get unlimited multicarrier/required more standard signal combination. Vector signal simulation software designers to give a modulation scheme with equipment suppliers more customization and different special algorithm and modulation scheme. To carry out important CCDF statistical measurement, need to produce long simulation signals. Can generate more carrier/standard signal is used to test zui new 2 g, 2. 5 g, 3 g base station amplifier performance.

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