Quadruple frequency-based scheme for realizing base station passive full duplex millimeter wave RoF link
A millimeter-wave, full-duplex technology, applied in the field of full-duplex link communication, can solve the problems of expensive external modulator and local oscillator signal source, high requirements for working environment, high cost of light source, etc., to achieve strong Actual operability, simplification of base station structure and functions, effect of base station cost reduction
Inactive Publication Date: 2010-06-16
BEIJING UNIV OF POSTS & TELECOMM
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The invention discloses a quadruple frequency-based scheme for realizing a base station passive full duplex millimeter wave RoF link, which is mainly used for remote transmission of a wireless signal between a base station and a central station in a Gb/s broadband millimeter wave communication system. The scheme is as shown in an attached drawing. A local oscillator with a frequency of fD/4 drives a lithium niobate Mach-Zehnder modulator to produce a light carrier with a frequency interval of fD/2 and two second-order sidebands. One sideband is separated by an FBG to realize single wave carrier modulation of a downlink data signal. The light carrier is transmitted to the base station through an optical fiber, and the light carrier and a double-frequency light millimeter wave signal with a frequency of fD are separated by the Mach-Zehnder modulator with a delay time difference of 1/fD. The former is reserved as an uplink light source, and the latter produces a millimeter wave signal with the frequency of fD through photoelectric conversion, and the signal is transmitted to a user through an antenna. The uplink millimeter wave signal is processed by envelope detection to acquire a baseband signal, loaded onto a reserved light wave by a low-speed optical modulator and sent back to the central station by the optical fiber. The scheme has a plurality of advantages, so that the scheme has good application prospect.
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