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Compensation Method for Orthogonal Frequency Division Multiplexing 60 GHz Millimeter Wave Radio over Optical System

A radio system, orthogonal frequency division technology, applied in fiber optic radio, multi-frequency code system, modulated carrier system, etc., can solve the problem of limiting the transmission capacity of the RoF system, limiting the transmission distance of optical radio frequency signals, and the periodic fading of radio frequency signals, etc. question

Active Publication Date: 2019-04-02
WENZHOU UNIV
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  • Application Information

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Problems solved by technology

However, optical link dispersion will not only cause periodic fading of radio frequency (RF) signals, but also affect the transmission performance of baseband data signals, resulting in waveform distortion of baseband signals, thereby limiting the transmission distance of optical radio frequency signals and limiting Transmission capacity of RoF system

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  • Compensation Method for Orthogonal Frequency Division Multiplexing 60 GHz Millimeter Wave Radio over Optical System
  • Compensation Method for Orthogonal Frequency Division Multiplexing 60 GHz Millimeter Wave Radio over Optical System
  • Compensation Method for Orthogonal Frequency Division Multiplexing 60 GHz Millimeter Wave Radio over Optical System

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Embodiment Construction

[0045] A typical millimeter-wave radio-on-fiber (RoF) access system is mainly composed of three parts: central station, base station and user terminal. The central station and the base station are connected by optical fiber to transmit light-carrying millimeter-wave signals; the base station and user terminals use millimeter-wave wireless communication. The main function of the central station is to realize the generation of millimeter wave light in the downlink, the up-conversion of the baseband signal and the reception and processing of the uplink signal; Transformed into an optical signal backhaul central station. Multi-ary 60 gigahertz (GHz) Orthogonal Frequency Division Multiplexing (OFDM) RoF system adopts literature [Zhang Cheng, Research on Broadband Optical / Electrical Hybrid Access System Based on OFDM, Doctoral Thesis, Peking University , 2013] system configuration (such as figure 1 shown), figure 1 In, TL: tunable laser; MZM: Mach-Zehnder; modulator; PC: polariza...

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Abstract

The invention discloses a compensation method of an OFDM (Orthogonal Frequency Division Multiplexing) 60GHz MMW radio on fiber system. The compensation method comprises the following steps; firstly acquiring the initial estimation of a channel from a time domain, and then improving the channel precision from the frequency domain by using the finite alphabet set feature of a signal. By using the compensation method disclosed by the invention, the high-precision channel estimation can be obtained without needing the long data accumulation and performing the complex computation of the singular value decomposition or full permutation.

Description

technical field [0001] The invention relates to the field of optical radio, in particular to an equalization compensation method for an OFDM 60 gigahertz millimeter wave optical radio system. Background technique [0002] In recent years, with the promotion and development of broadband multimedia services such as high-speed Internet and high-definition TV, future wireless communications will need to provide greater communication bandwidth and ensure low-cost access for each user. In this context, 60 gigahertz / gigahertz (GHz) millimeter wave communication with high frequency and large potential application bandwidth has become a very competitive candidate technology. However, GHz is at the absorption peak of oxygen, and the transmission loss is large. It can be used to realize wireless short-distance, high-bandwidth data transmission, and support very small cellular structures. 60GHz millimeter wave has an ultra-wide spectrum that does not require a frequency license. resour...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L25/03H04L25/02H04B10/2575H04B10/69
CPCH04B10/25759H04B10/6971H04L25/0204H04L25/03012H04L27/2628H04L27/265H04L27/2655
Inventor 阮秀凯周月朱海永戴瑜兴蔡启博谈燕花肖海林李志红张耀举崔桂华
Owner WENZHOU UNIV