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Research on Communication and Direction-finding System of Multi-beam Modulation Carrying Directional Information

Author: FuNa
Tutor: SongMaoZhong
School: Nanjing University of Aeronautics and Astronautics
Course: Communication and Information System
Keywords: Communicate Finding Multi-antenna Modulation techniques Spatial modulation Multibeam Space-time coding
CLC: TN929.5
Type: Master's thesis
Year: 2009
Downloads: 14
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Abstract


Radio communication and direction-finding communication tracking , positioning technology . The main design idea is based on communication mainly finding just at the receiving end using multi-antenna space-time processing or single- pulse technology , multiple antenna receiver miniaturization is not easy . In order to solve the communication and measurement of the micro- receiver to track problems , launched on the basis of the dual- beam modulation analysis , using a multi-beam interference modulation of thinking , export m beam communication with finding the system program , the use of multiple beam interference between the two - dimensional direction information modulated onto the signal space of the digital communication information at the receiving side with a simple single-antenna receiving information directly from the signal space demodulated digital communication information and the two - dimensional orientation information, completion of communication and direction-finding function , this article focuses on the launch of three -beam interference modulation communications and direction finding system , complete the following two aspects : 1 , designed for multi-beam modulation communication with finding a unit spacing greater than half incentive to the formation of three pattern function of the characteristics of the good and poor wavelengths eight yuan antenna sparse array , through a variety of eight element array to achieve certain coverage does not exist in the direction of multi- valued fuzzy solver , but also decreases mutual coupling between the transmit antenna elements impacts; 2, at the transmitting end after the clever coding and modulation of the time domain , the function of the beam parameters of the three directions FIG direct modulation to the transmit signal , modulated in the signal space containing both digital communications information, but also contains relative direction of information between the receiver and transmitter , the receiving terminal simply use a single antenna reception , and communication with direction information can be obtained by demodulating the signal . The detailed three - beam modulation communication and direction-finding system program , given the communication demodulation and direction key estimation algorithm , simulation performance and mistakenly launch three - beam modulation in additive white Gaussian noise channel goniometer designed rate performance , verify the launch multi-beam modulation communication and measuring the effectiveness of the system design .

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