Communication and information system
(1) Research on mobile communication and wireless technology System simulation, multiple access technology, digital modulation and demodulation technology, dynamic channel allocation technology, synchronization technology, multi-user detection technology, voice compression technology, broadband multimedia technology and radio frequency technology of digital mobile communication and personal communication system. This paper studies the composition, new technology and performance analysis of various digital microwave communication, mobile communication and satellite communication systems, as well as WLAN, WMAN and ad-Roc networks, including the research and development of SDH technology and the commonly used technologies in the above systems, such as coding, modulation and demodulation, synchronization and signaling, multiple access and network security.
(2) Wireless Data and Mobile Computing Network studies the theories, protocols, technologies, implementations of wireless digital transmission, media access control, wireless resource management, mobility management, mobile multimedia access, wireless Internet access, mobile IP, wireless IP, mobile computing network and various applications based on mobile computing network. This direction also studies intelligent technologies in modern mobile communication (such as smart antenna, intelligent transmission, intelligent communication protocol and intelligent network management system). ).
(3) IP and broadband network technology study the QoS, traffic engineering and lawful interception of broadband IP communication network; Networking technology, communication protocol and control technology of VoIP; Softswitch technology of next generation network: SIP protocol research and application development; B3G core network technology; IP broadband access and MAN key equipment and technology development; Multilayer switching technology, IP/ATM integration technology and MPLS technology; IP network management model and technical realization: mobile agent and its application in IP communication network.
(4) Research on network and application technology: The structure, interface, protocol, network simulation and design technology of broadband communication network; Management model of network management, interface standard, design and development of network management system; System, software and system development of programmable network.
(5) Research on information security in communication and information system The theories and technologies related to information security in communication and information system mainly include data encryption, key management, digital signature and identity authentication, network security, computer security, security protocols, stealth technology and smart card security. Focusing on the information security of wireless communication network, according to OSI protocol, the security solutions are studied from all aspects of the network to achieve credibility, controllability and availability.
Signal and information processing specialty
(1) Intelligent signal processing technology in modern communication This research direction is based on modern signal processing, and studies various intelligent processing technologies to improve the effectiveness and reliability of communication and information systems and their applications in mobile communication, multimedia communication, broadband access and IP networks. At present, the research focuses on various advanced intelligent signal processing technologies in the new generation wireless communication network, such as blind separation of communication signals, blind channel identification and equalization, multi-carrier modulation, multi-user detection, space-time joint processing, source-channel coding and various adaptive technologies in the network environment.
(2) Quantum information technology studies the information processing and transmission technology based on quantum state, including key technologies and theories such as quantum error correction coding, quantum data compression, quantum teleportation and quantum cryptography. It is of great significance to realize a new generation of high-performance computers and ultra-high-speed and ultra-large-capacity communication information systems.
(3) "Wireless communication and signal processing technology" This research direction studies the communication and signal processing technology in a new generation of wireless communication networks, such as ad hoc self-organizing networks, sensor networks and ultra-wideband (UWB) networks. The main research contents include multi-packet receiving and blind processing technology based on signal processing, channel estimation and equalization technology based on particle filtering, media access control technology based on signal processing, target tracking and information fusion technology, network protocol system and so on.
(4) "Modern Speech Processing and Communication Technology" Speech is the most convenient and quick means of human communication, so it plays a very important role in various modern communication networks and intelligent signal processing applications. This research focuses on the digital compression, recognition, synthesis and enhancement of voice signals, intelligent man-machine interface technology based on voice, real-time voice communication technology and information hiding technology oriented to IP network, voice digital processing and transmission technology in mobile communication, software radio communication technology based on DSP, and multimedia processing and communication technology of audio, video, data and text in various network environments.
(5) Modern information theory and communication signal processing On the basis of modern information theory, we study various signal processing technologies in ATM and IP networks, mobile and personal communications, multimedia communications and broadband access networks, such as low delay, low bit rate and high quality speech coding and image coding, which are suitable for error correction coding, efficient multi-carrier modulation and various adaptive processing technologies in the third generation mobile communications. They are the core technologies to ensure the realization of the development goal of 2 1 century communication and improve the effectiveness and reliability of communication. This direction focuses on the applied basic research of these technologies.
(6) Image processing and multimedia communication study multimedia information, especially the processing, description, application system and key technologies of image information. Including: ① image and video signal processing and compression coding algorithm research, application system design and implementation; ② IP-based video transmission technology and service generation environment; ③ Data and multimedia communication on mobile network and wired network; ④ Broadband access network technology based on xDSL; ⑤ Image database and image network technology; ⑥ 3D image processing, modeling, display and analysis technology.
(7) Information Network and Multimedia Technology While conducting ASIC research on the application of information network and multimedia technology, we focus on developing various multimedia terminals, including ① multimedia information compression coding, ② channel coding (focusing on error correction coding), ③ video on demand (VOD) and interactive TV, conference TV, distance education/examination/medical treatment, ④ video driving system, and ⑤ video and audio signal coding.
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