||With the rapid development of technology, more and more people rely on the network and multimedia. With the growing of the bandwidth demanding, the available carrier frequency below 6 GHz is limited. Because there still have large bandwidth in the high frequency band, millimeter-wave communication has become a popular candidate for the next generation mobile communication. However, in millimeter-wave transmission, the transmission signal wavelength is short, and the energy attenuates fast. Therefore, the large-scale antenna and beamforming are commonly used to the millimeter wave to improve the energy and achieve the efficiency of the transmission.|
In beamforming, the beam tracking technology is commonly used in which the base station search for the angle of arrival and transmit the data toward the angle. The beam tracking can improve the efficiency of transmission. The paper mainly focuses on the realization of the beam tracking technique by using the compressed sensing (CS) searching method. The CS searching method is faster than the traditional exhaustive method. However, the CS searching method is sensitive to the carrier frequency offset (CFO) which results from the inconsistency of the oscillators at both ends. Because CFO always exits in practical communication systems, the CS searching method is difficult to be use in practical applications. In this thesis, we present an effective way to estimate the CFO that incorporates with the CS searching method. To verify our design, we use Long Term Evolution (LTE) technology system as the basis for the development of beamforming and the CS beamforming technology in the 3.5 GHz band.