In recent years, Stanford University, Rice University, University of California and other internationally renowned universities have carried out theoretical exploration and engineering realization of co-frequency full duplex, published many IEEE top conferences and journal papers, and made relevant experimental platforms, and obtained clear experimental data (see the table below). Project University of California Les Stanford 20 12 Stanford 20 13 University of Electronic Science and Technology of China 20 12 University of Electronic Science and Technology of China 20 13 1 antenna configuration1t1t 8+0t1t1t/t2r2 frequency 2.4ghz 2.4ghz1.6 ~ 4.0ghz 2.5 ~ 2.7ghz3 signal bandwidth 30MHz 10 MHz 10. MHz 80 MHz 20 MHz 20 MHz 4 transmit antenna power10dbm10dbm10dbm20dbm10dbm23dbm5 spatial self-interference cancellation ability is not 20dB 20 dB 15. DB 20 dB 45 dB 6 radio frequency domain self-interference cancellation ability 47 dB 35 dB 45 dB 63 dB 55 dB 35 dB 7 digital domain self-interference cancellation ability is not 26 dB 30 dB 35 dB 3 1 dB 27 dB 8 total cancellation ability 47 dB. 55dB90 ~ 95dB105 ~10dB91db107db9 experimental environment There are no multiple laboratories in the microwave darkroom.
Multipath environment laboratory
Multipath environment laboratory
Multipath environment laboratory
Multipath environment laboratory
Multi-channel environment 10 experimental equipment Agilent instrument Warplab instrument and homemade hardware mixed instrument and homemade hardware mixed homemade uSDR homemade uSDR University of Electronic Science and Technology of China.
In 2005, Professor Tang Youxi of the University of Electronic Science and Technology of China applied for the national defense patent "A XX receiving method in XXX communication system", which was authorized on March 20 10. This patent gives a self-interference suppression method for two devices working at the same time and with the same frequency. Since 20 10, Tang Youxi's team has applied for a number of patents on self-interference cancellation methods of simultaneous co-frequency operation and co-frequency full duplex, and published many top IEEE journals and conference papers.
201365438+1October 18 Professor Tang Youxi of the University of Electronic Science and Technology of China completed the experimental verification of the same-frequency full-duplex (CCFD) technology in 4G (the experimental video, please search "Tang Youxi of the University of Electronic Science and Technology of China CCFD_ same-frequency full-duplex demonstration video _V.2.0" The spectrum efficiency of 4G air interface is doubled, and the service rate is increased from 30Mbps to 60Mbps, which is the first test scenario of 4G CCFD experimental bed in China. This indicates that CCFD technology in China has achieved a leap from theoretical research to engineering verification.
20 13, 12, Professor Tang Youxi's team further completed the full-duplex experimental verification of LTE two transmitters and two receivers, and improved the total self-interference suppression ability to 107dB. Experiments show that the first multi-antenna LTE full-duplex experimental platform in China has been built, and its self-interference cancellation ability is in a leading position in the world.
Peking University
In 2006, Professor Jiao of Peking University applied for the patent related to the same frequency synchronous full duplex. From 2006 to 20 13, Peking University continued to carry out the research on co-frequency synchronous full duplex, applied for more than one related patent 10, and published many top IEEE journals and conference articles.
In recent years, Peking University has made continuous and in-depth research on the same-frequency full-duplex networking technology, and put forward the evolution scheme of adopting the same-frequency full-duplex in the cell, that is, the base station transmitting antenna adopts centralized layout and the base station receiving antenna adopts distributed layout. So that that system capacity can be greatly improve with limited interference cancellation capability. On this basis, Professor Jiao's team realized the prototype of the same-frequency full-duplex hardware demonstration system in the cell. Up to now, more than 20 enterprises and research institutes, including Huawei, Datang, Princeton University in the United States and Hsinchu Jiaotong University in Taiwan Province Province, have visited the demonstration system and highly praised it.
In June, 20 13, Peking University took the lead in realizing a single-room test demonstration system with the same frequency and synchronous duplex. The system includes a base station and two mobile terminals: the base station works in duplex at the same time with the same frequency, covering a diameter of 100 m, and the terminal is in TDD mode, and the bandwidth efficiency is twice that of TDD system. At the same time, full-duplex equipment with the same frequency, corresponding to revolutionary technologies such as mobile communication, satellite communication, data link, military radio and microwave relay, has a huge market prospect and will be the core wireless communication technology change in the next decade!