Introduction of JH5005A mobile communication experiment system

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One system configuration
l Mobile switch (teacher platform): Install the mobile switch software and system configuration software developed by us on a computer with more than four Pentium configurations, and add a 32-door switch.
l TCP / IP-based network (local area network) composed of HUB and network card
l Student platform: It is composed of a computer with a configuration of more than four, and the student platform software of the mobile communication experiment box is installed on it, which is connected to the mobile communication experiment box through the serial port. Each mobile communication experiment box corresponds to a student platform.
l Mobile communication experiment box: the experiment box includes mobile terminal, base station, 900MHz GSM communication module, CPLD module, etc.
l 60MHz digital storage oscilloscope, one for each mobile communication experiment box.
Two can open the experiment
l Source codec experiment (1)
l Source codec experiment (2)
l Channel codec experiment: linear block code + interleaving
l Channel codec experiment: convolutional code
l Channel codec experiment: scrambling code
l Channel codec experiment: cyclic code
l GMSK modulation and demodulation experiment
l QPSK modulation and demodulation experiments
l CDMA spread spectrum experiment
l CDMA despreading experiment (address code capture)
l Mobile channel simulation experiment (Gaussian, multipath, Rice, Ruili fading)
l Mobile channel equalization experiment
l Channel multiplexing experiment (time division, frequency division, code division)
l GSM protocol frame structure experiment
l GSM mobile station network access process experiment
l GSM mobile station calling experiment
l GSM mobile station called experiment
l GSM mobility management experiment
l 900MHz GSM system series experiments: calling, called, sending short messages, receiving short messages, GPRS data transmission.
Three experiment box features
l Because not only the digital storage oscilloscope but also the computer are used in the interactive mode of the experiment, the amount of information given to the experiment by students has made a qualitative leap. .
l The experiment that can be set up in the experiment box covers all the links involved in the mobile communication system: source coding, channel coding, detailed process of signaling structure and signaling, modulation and demodulation, channel simulation, channel equalization, channel Multiplexing methods, etc.
l Source codec experiment: not only introduce classic voice coding PCM, 32K ADPCM, 16K ADPCM, but also introduce the efficient voice compression coding technology currently widely used in VoIP and digital voice transmission systems, such as regular pulses based on hybrid coding Excited long-term prediction (RPE-LTP) encoder (adopted by GSM system), AMBE algorithm encoding based on linear prediction code excitation (proposed by MIT, USA), etc.
l Channel coding / decoding experiment: Through the process of random information generation, coding, random error generation, decoding and error statistics, let students understand the principle of channel coding and decoding and error correction ability; meanwhile, open the CPLD hardware resources so that students can adopt Hardware description languages ​​such as VERILOG, HDL, and ispEXPRESS are used for independent programming to deepen students' understanding of channel coding, and at the same time they can be familiar with the application of CPLD in channel coding.
l Modulation and demodulation experiments: Carrier synchronization and bit synchronization (symbol synchronization) in each demodulation experiment use a real-time synchronization scheme; at the same time, many observation points are set in each link of the modem, students can not only Observation of these observation points through an oscilloscope also uses the technical means of virtual instruments (virtual oscilloscopes) to collect the data of each observation point into the computer, which can be synchronized observation, comparison, zoom and other operations.
l System experiment simulation: completely in accordance with the stipulations of GSM 0407 and GSM0408 in the 3GPP standard, the signaling processes such as boot login, calling, called, and mobility management are realized. Students can learn more about the three air interfaces in these processes Any event that occurs at the protocol layer; moreover, a single-step working mode is set up, which can demonstrate each process in detail like a slow motion movie, and can also send various signaling to the mobile terminal and the base station separately. These unique advantages of system experiments are currently unmatched by any other similar products in China.
l 900 MHz GSM system experiment: not only can do calling, called, short message sending and receiving experiments, but also can do GPRS data transmission experiment; meanwhile, open and transparent command format, students can try various other AT commands, up to more than 100 kinds.
l Because the experiment box adopts the design idea of ​​software radio, the experiment box can be used for channel simulation and channel balancing, and in the future, it can also be used for secondary development of the software according to the teaching requirements and technical progress. Just replace the software. It is convenient to upgrade the system, which greatly saves the user's investment while maintaining the advanced nature of the system.
The mobile communication experimental system is developed under the current background of the rapid development of mobile communication, based on the teaching needs and integrating the opinions of many college experts and teachers. It integrates advancedness, practicability and economy.
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