Font Size: a A A

The Measurement And Analysis Of The Co-time Co-frequency Full-duplex Self-interference Channel

Posted on:2016-06-25Degree:DoctorType:Dissertation
Country:ChinaCandidate:X Y WuFull Text:PDF
GTID:1108330473456086Subject:Communication and Information System
Abstract/Summary:PDF Full Text Request
The utilization of the spectrum can be doubled by using the technologies of CCFD(Co-time Co-frequency Full-Duplex) in theory, which has attracted many attentions by researchers. Now, the main problem is the self-interference suppression which blocks the application of the technology of the CCFD. Before the study of the full-duplex self-interference suppression technology, the form of full-duplex self-interference channel must be understood. In order to optimize the suppression of the self-interference signals in the receiver, the self-interference channel impulse response and its statistical characterizations should be known. It is a fundamental problem to study the self-interference suppression of CCFD.In this thesis, the characterization of the CCFD self-interference channel is studied by the method of frequency domain measurement. The measurements are performed at 2.5GHz~2.7GHz under indoor and outdoor environment.Firstly, under the scenes of indoor office, hallways and shielding room, the measurement and analysis of the CCFD self-interference channel will be done in the situation of the distance between transmitting and receiving antenna. The results are as follows:(1) For the indoor office scene, when the distance of transmitter and receiver is larger than 1 m, the path loss exponent is 1.86. When the distance is less than 1.0m, the path loss exponent is 1.52. For the hallways scene, when the distance is less than 1.0m, the path loss exponent is 0.94. For the shielding room scene, when the distance is less than 1.0m, the path loss exponent is 0.52.(2) For these three kinds of indoor scenes, the PDP can be decomposed into two components: the LOS path and space multipath. For the three scenes, there are power-law relationship between the power of LOS path and the distance of transmitting-receiving antenna. The path loss exponent is 1.68, 0.82, and 1.00 separately. In the three scenes, there are power-law relationship between the power of space multipath and the arrival time of space multipath. The exponents are 4.36, 3.19 and 1.56 separately.(3) For the indoor office scene, when the distance between transmitting and receiving antenna is larger than 1 m, the RMS delay follows lognormal distribution. When the distance is less than 1.0m, the RMS delay at different antenna distances follow lognormal distribution whose mean and variance are linear functions of antenna distance respectively. For the hallways scene, there is a power-law relationship between RMS delay and the distance of transmitting-receiving antenna. The RMS delay at different antenna distances follows lognormal distribution. For the shielding room scene, the RMS delay at different antenna distance follow lognormal distribution too.(4) For the hallways scene, the coherence bandwidth statistics at different antenna distance follow Weibull distribution. For the shielding room scene, the coherence bandwidth statistics at different antenna distance follow lognormal distribution.(5) For the office and the hallways scene, the Ricean K-factor follows Weibull distribution. For the shielding room scene, the Ricean K-factor follows lognormal distribution.Secondly, under the indoor office, hallways and shielding room scenes, the measurement and analysis of the CCFD self-interference channel will be done in the situation of the common antenna for transmitter and receiver. The results are as follows:(1) For these three kinds of indoor scenes, the path loss follows lognormal distribution.(2) We find that the PDP can be decomposed into three components: leakage path, antenna reflection path, and space multipath. The major effects in determining the leakage path and the antenna reflection path are analyzed. Furthermore, for the three scenes, there are power-law relationship between the power of space multipath and the arrival time of space multipath. When the length of the feeder line is 0m and the height of antenna is 1.7m, the exponents are 4.34, 4.42 and 1.56 separately.(3) For these three kinds of indoor scenes, the RMS delay follows lognormal distribution. The relationship between the length of the feeder and the RMS delay spread is theoretically discussed, and the results of the relationship are verified by experiments.(4) For these three kinds of indoor scenes, the coherence bandwidth follows normal distribution.Thirdly, under the outdoor building wall, roof and square scenes, the measurement and analysis of the CCFD self-interference channel will be done in the situation of the distance between transmitting and receiving antenna. The results are as follows:(1) For these three kinds of outdoor scenes, when the distance is less than 1.0m, the path loss exponents are 1.04, 1.08, and 1.07 respectively.(2) For these three kinds of outdoor scenes, the PDP can be decomposed into two components: the LOS path and space multipath. There are power-law relationship between the power of LOS path and the distance of transmitting-receiving antenna. The path loss exponents are 0.80, 0.90, and 0.93 separately. In the three outdoor scenes, there are power-law relationship between the power of space multipath and the arrival time of space multipath. The exponents are 4.73, 3.31 and 2.71 separately..(3) For these three kinds of outdoor scenes, there is a power-law relationship between RMS delay and the distance of transmitting-receiving antenna. For the building wall and roof scene, the RMS delay at different antenna distance follow lognormal distribution. For the square scene, the RMS delay at different antenna distance follow a generalized extreme value distribution.(4) For these three kinds of outdoor scenes, the coherence bandwidth statistics at different antenna distance follow Weibull distribution(5) For the building wall and roof scene, the Ricean K-factor follows Weibull distribution. For the square scene, the Ricean K-factor follows lognormal distribution.Finally, under the outdoor building wall, roof and square scenes, the measurement and analysis of the CCFD self-interference channel will be done in the situation of the common antenna for transmitter and receiver. The results are as follows:(1) For these three kinds of outdoor scenes, the path loss follows lognormal distribution.(2) We find that the PDP can be decomposed into three components: leakage path, antenna reflection path, and space multipath. The major effects in determining the leakage path and the antenna reflection path are analyzed. Furthermore, for the three scenes, there is a power-law relationship between the power of space multipath and the arrival time of space multipath. When the length of feeder line is 0m and the height of antenna is 1.7m, the exponents are 5.81, 4.19 and 5.20 separately.(3) For these three kinds of outdoor scenes, the RMS delay follows lognormal distribution. The relationship between the length of the feeder and the RMS delay spread is discussed.(4) For the building wall and square scene, the coherence bandwidth follows a generalized extreme value distribution. For the roof scene, the coherence bandwidth follows a Weibull distribution.The CCFD self-interference channel characteristics at indoor and outdoor scenes are studied in the thesis. The results will guide the research of self-interference suppression of CCFD to be engineered, and will make the design of communication system of CCFD practical.
Keywords/Search Tags:Co-time Co-frequency Full-Duplex, self-interference channel, frequency domain measurement, 2.5GHz~2.7GHz, channel characterization
PDF Full Text Request
Related items