Cognitive network experiment system (Joint with Prof. Hui Yu and Prof. Xiaoying Gan) (Sponsored by Docomo.com and Fujitsu.com, NSF China, 973 Project etc)
Smart spectrum detection
We already have a scalable spectrum detection system. The system consists of a radio frequency subsystem , baseband processing subsystem and graphical PC-based signal processing platform.
Figure 1. Core components of IEEE802.11a/b/g band spectrum sensing system
We have the ability to perform spectrum sensing, channel measurement in the frequency range IEEE802.11a/b/g (including MIMO channel), and wireless data transmission. These can support the cognitive wireless communication experiment in corresponding frequency band.
Figure 2. Peripheral equipments of IEEE802.11a/b/g band spectrum sensing system
The Base-band signal processing subsystems includes: FPGA XC2VP70, two A/D D/A modules, two AD9430 chips, two AD9753 chips with multiple interfaces, such as USB, LVDS, module extension interface, interface to logic analyzer.
WPAN (IEEE 802.15) development environment
In the development of the IEEE 802.15, we already have a certain amount of accumulation. Real-time online simulator can be directly connected to the computer through the USB interface, performing some functions such as code downloads, online debugging. C51RF-3-PK development system supports IAR integrated development environment with 7.20 version above. This is a powerful C51 compiler and IDE, which is similar to KeilC51.
Figure 3. C51RF-3-PK development toolkit
C51RF-3-PK ZigBee protocol stack development platform includes the following hardware components
CC2430 wireless microcontroller C51RF-3 real time online simulator (USB interface).
CC2430 2.4GHz High-frequency wireless target module.
CC2430 extended wireless network performance board
Figure 4. Cognitive wireless sensor node module
RFID-based multi-mode device
This device consists of ARM embedded development borad, RFID reader module, GSM/GPRS module and WIFI network card, which can be used to recognize labels such as ISO15693, ISO14443, Tag-ItTM. This device has multi-tag reading ability, as well as being able to trafer data, authenticate user and download information through GSM/GPRS or WiFi networks automatically/manually.
Based on this device, we can be further developed with multimode IntelliSense WPAN and WMAN interface Terminal and Verify that the Terminal model for CR.
Figure 5. RFID multimode system
WPAN/WMAN/GPRS three mode terminal
Using the HP notebook computer + Cisco Aironet wireless network card + Siemens MC35 GPRS + AirStream 5800 CPE (CPE: Customer Premise Equipment), we We set up a tri-mode terminal which has WiFi / WiMAX / GPRS three network access capability. We develop the basic communication protocol support software , basic network selection function , and the completion of a WiFi network physical layer, MAC layer , network layer information extraction. Client's access control function is implemented as a system process to obtain network information through the information reading for each network interface. It also read users’ configuration file as well as application program at the same time, from which user's information can be obtained. Based on the above information, complete the calculation of user utility function, so as to realize the network user utility and decide related access control decision.
Figure 6. Intelligent cognitive multimode terminal