Measurements And Modeling Of Outdoor Co-Time Co-Frequency Full-Duplex Self-Interference Channel

With the development of communication technology, the scarcity of radio spectrum resources has became more and more prominent, co-time co-frequency full duplex(CCFD) technology gains widespread attention because of the superiority of saving half of the spectrum resource in theory. However, a key difficulty of CCFD communication is the self-interference of channel, namely local transmitting signal interferes in desired receiving signal. To effectively suppress the self-interference, the statistical characterizations of the self-interference channel should be known.For this purpose, the disstation surveys some common channel models and channel measurement methods, proposes a frequency domain channel measurement method combining the realistic condition, builds the hardware measurement platform, measures outdoor self-interference channel between the frequency of 2.5GHz and 2.7GHz, and then extracts the channel parameters, analyses the result and trys to build a channel model, the main contents include:Firstly, in the situation of separated transmitting and receiving antenna, the measurement, analysis and modeling of the CCFD self-interference channel will be done under the outdoor scenarios of square, building roof and outer building wall:Under the three scenarios, the power delay profile(PDP) makes up of LOS component and spatial scattering component, the power of LOS component is far greater than spatial scattering component, the amplitude of LOS component is relative stable while the amplitude of spatial scattering component is more random; when the distance of transmitting and receiving antenna is between 0.1m and 1.0m, the path loss of the three scenarios are 1.06, 1.09 and 1.03 according to data fitting method; root mean square(RMS) delay spread has a linear relation with the separation of transmitting and receiving antenna, and the cumulative probability distribution(CPD) of RMS delay spread obays extreme value distribution, lognormal distribution, lognormal distribution under corresponding scenarios, while the CPD of coherent bandwidth obays extreme distribution,weibull distribution and weibull distribution.Secondly, in the situation of communal transmitting and receiving antenna, the measurement, analysis and modeling of the CCFD self-interference channel will be done under the outdoor scenarios of square, building roof and outer building wall:Under the three scenarios, PDP makes up of three components, they are circulator leaking component, antenna reflecting component and spatial scattering component, the main path which makes up of circulator leaking component and antenna reflecting component has a relatively stable amplitude while spatial scattering component has a random amplitude; the CPD of path loss obays normal distribution under the three scenarios, and relates to not only circulator, but also feeder line and surrounding environment; the CPD of RMS delay spread obay lognormal distribution; the CPD of coherent bandwidth obay extreme value distribution, weibull distribution and extreme value distribution under corresponding scenarios.The measurement and modeling of CCFD self-interference channel of specified outdoor scenarios provides a basis on mastering CCFD self-interference channel, provides a certain degree reference on self-interference suppression, and makes positive significance on the development of CCFD technology.