91 results about "Fiber wireless" patented technology

A system and method for providing multi-services within a communication network according to various exemplary embodiments can include storing, in a database of a computer, user-defined sets of rules and instructions for providing multi-services to end user devices connected to a communication network comprising a Hybrid Fiber-Wireless (HFW) network having policy management capabilities. The system and method can receive, at one or more processors, the user-defined sets of rules and instructions from a plurality of end users via a plurality of end user devices. The system and method can configure a virtual network for each end user within the communication network using the policy management capabilities based on the user-defined sets of rules and instructions provided by each end user. The user-defined sets of rules and instructions define provisioning and delivery of resources and services provided by the communication network to the end user.

The centralized optical-fiber-based wireless picocellular system includes one or more service units at a central head-end station. The one or more service units are optically coupled to one or more transponders via respective one or more optical fiber RF communication links. The transponders are each adapted to provide within the associated picocell electromagnetic RF service signals from different service units, and receive electromagnetic RF service signals from any client device within the picocell. The service signal from the particular client device is sent over the optical fiber RF communication link back to one or more service units. The transponders are arranged along the length of one or more optical fiber cables, which can be distributed throughout a building infrastructure. This creates a picocellular coverage area that provides a number of different wireless services relative to the building infrastructure. The service units can generate the electrical service signals, pass such signals to and from one or more outside networks, and/or coordinate the delivery of the signals between client devices within the picocellular coverage area.

A Fiber-wireless uplink consists of a wireless channel followed by a radio-over-fiber (ROF) link. Typically, nonlinear distortion of the ROF link is the major concern when the radio frequency is only a few GHz. This especially severe in the uplink, because of the multipath fading of the wireless channel. A Hammerstein type decision feedback equalizer is described for the fiber wireless uplink, that compensates for nonlinear distortion of the ROF link as well as linear dispersion of the wireless channel. Since the linear and nonlinear parts of the receiver are separated, tracking the fast changing wireless channel is virtually independent of compensating for the relatively static nonlinearity. Analytical results show that the receiver provides excellent compensation with notably less complexity.

A radio over fiber link apparatus for transmitting/receiving radio frequency up/downlink signals in a TDD mobile communication system. The radio over fiber link apparatus includes a center site for receiving radio frequency signals from an access point of the mobile communication system. The center site has a first electro-optic converter for converting the radio frequency signals into optical signals, bias control of the first electro-optic converter being performed based on the switching of TDD signals; and a remote for transmitting the radio frequency signals to a mobile communication terminal through an antenna. The remote site has a first photoelectric converter for converting the optical signals transmitted through an optical fiber from the center site into radio frequency signals.

The invention discloses an intelligent micropower optical fiber wireless covering system relating to the field of radio-frequency communication devices and comprising a fiber optic repeater near-end machine and at least one micropower fiber optic repeater far-end machine, wherein, the fiber optic repeater near-end machine and each micropower fiber optic repeater far-end machine are both connectedwith a transmission signal via an optical fiber; the fiber optic repeater far-end machine comprises an intelligent inactivity multi-split radio-frequency light module, and the micropower fiber optic repeater far-end machine is an intelligent micropower radio-frequency light module. The invention integrates a noise amplifier module, a power amplification module and antennae into the intelligent micropower radio-frequency light module, and carries out intelligent control, which improves integration level and lowers the cost of the intelligent micropower optical fiber wireless covering system, so that the intelligent micropower optical fiber wireless covering system of the invention is more competitive, and is suitable for mobile communication network of GSM, CDMA, 3G, 4G, etc.

The invention provides an ultrahigh-speed fiber wireless MIMO transmission system and method. The system comprises an analog-to-digital/digital-to-analog conversion unit, a series-to-parallel/parallel-to-series conversion unit, four paths of 4QAM sequence encoding and decoding units, four paths of OFDM modulation and demodulation units, four paths of radio frequency quadrature modulation and demodulation units, a downlink optical dual-path quadrature coherent modulation unit, a downlink optical coherent demodulation photoelectric detection unit, four radio frequency filtering amplification processing units, four paths of radio frequency transmit-receive antennas, an uplink optical coherent modulation photoelectric detection unit and an uplink optical coherent demodulation photoelectric detection unit. An encoding, modulation, transmission, demodulation and access system and method are provided for high-speed fiber microwave transmission between adjacent base stations and high-speed wireless mobile receiving and transmission between the base stations and terminals in 5G (the fifth generation of mobile communication ) and 6G (the sixth generation of mobile communication ) future mobile communication systems of future wireless mobile service providers.

The invention relates to an optical-fiber wireless system for full-duplex communication, which consists of a central station and a base station, wherein the central station and the base station are connected through an optical-fiber transmission links; the central station generates subcarrier signals by mixing baseband signals with radio frequency sine-wave signals, generates optical double-sideband differential phase-shift keying signals through the modulation of an optical phase modulator, performs power amplification, and then transmits the signals to the base station; the base station separates the signals transmitted by the central station; the signals are divided into an upper way and a lower way through an optical splitter; the upper way generates carrier-suppressed differential phase-shift keying optical-carried millimeter waves which are converted into downlink millimeter wave signals through photoelectric conversion and then sent to wireless terminals through antennas; the lower way generates reference local oscillator signals through photoelectric conversion, mixes the reference local oscillator signals with uplink millimeter wave signals, and generates uplink baseband signals through down conversion; and central carrier waves are re-modulated by the uplink baseband signals and then transmitted back to the central station. The system has the advantages of simplifying generation devices for optical-carried millimeter waves and reducing cost, along with simple flexible structure, strong extensibility, more compact structure and easiness for integration.

The invention belongs to the technical field of communication network, in particular relates to a survivable passive optical network planning method based on fiber-wireless integration. A wireless mesh network is formed by configuring a wireless function module for each optical network unit ONU and deploying a wireless router at the front end of the network, each working optical network unit ONU is allocated with one or more standby optical network units ONU; if one branch optical fiber fails, the working optical network unit ONU which is disconnected can transfer the service to its standby optical network unit ONU through a wireless standby route of the front end; the standby optical network unit ONU utilizes surplus capacity to bear the service from the working optical network unit ONU and uploads the service to an optical line terminal OLT; and the wireless router deployment cost is minimized under the condition of satisfying the hop count limit of the wireless standby route and fully protecting traffic. The survivable passive optical network planning method suffers small constraint from geographical environment, is conductive to reduce the service restoration time delay, and is suitable for large-scale survivable passive optical network planning.

This invention discloses a method for generating radio signals and wire baseband at the same time by a double-arm modulator and a single-wavelength light source in a radio-on-fiber(ROF) communicastion system and a system for transmitting two kinds of signals simultaneously on a same wavelength by fiber, which utilizes a dual-webbing modulation and a optical filter theory to generate dual-webbing signals and filter ROF mm waves and baseband data signals from down link to be provided to different users, and this invented system is not only used in single-channel ROF system but also used in WDM ROF system.

The invention discloses a method of generating light millimeter wave without light modulator and full duplex fiber wireless communication system which belongs to fields of Radio-on-Fiber (ROF) communication system. The base band data signal and radio frequency sine wave are mixed to drive the direct modulating laser to generate double-side-band signal, then transmitted to the base station via optical fiber, the base station adopts filter to separate first order side-band signal and center carrier wave. The first order side-band forms light millimeter wave whose repetition frequency is two times of radio frequency signal. The full duplex fiber wireless communication system of the invention provides five realization schemes of up-bound link and two schemes of receiver. Said method of generating light millimeter wave and full duplex fiber wireless communication system decrease the amount of light elements used, and economic effect can be obtained.

The invention relates to an optimization method for the radio wavelength division multiplexing system of a double-mode locked-mode optical fiber. In a base station, a light beam splitter is used for splitting a downlink signal which is sent to the base station by a junction center into two beams of signals, wherein, one beam of signal passes through a photorectifier, an amplifier and a filter and then is send out by an antenna; the other beam of signal passes through an optical isolator and then is sent to a multimode laser. The multimode laser separates single sideband optical carrier signals without the downlink signal from the signals, and then the single sideband optical carrier signals are sent into an external modulator. Uplink data signals after the frequency conversion are modulated by the external modulator on the single sideband optical carrier signals, and then conveyed to the junction center through the optical fiber. By adopting an optical branching device and a multimode laser, a carrier wave is extracted from the dual wavelength of downlink carrier data in the base station for loading uplink data, thus the equipment and the link are not required to be additionally provided for sending the carrier wave which is used by the uplink data. The optical radio system of the invention has good feasibility and saves system resources while improving the system efficiency.

The invention provides an optimal distribution method for optical network units (ONU) in an optical fiber wireless hybrid access network. A peer-to-peer communication mode among wireless terminals in the optical fiber wireless hybrid access network and communication between the wireless terminals and the Internet are combined. The method comprises the following steps of: acquiring parameters of an optical fiber sub-network, a wireless mesh sub-network, the total number of the ONUs to be distributed and available positions for the distribution of the ONUs; representing the optical fiber wireless hybrid wireless network into a directed graph according to the acquired parameters; establishing a mixed-integer-linear-programming-based optimal distribution mathematical model for the ONUs according to the directed graph; performing resolution by utilizing an integer linear programming resolution method; and acquiring the optimal distribution positions of the ONUs. By the method in the embodiment of the invention, the number of wireless paths of transmission paths for peer-to-peer communication among the wireless terminals in the wireless mesh sub-network is decreased, signal interference among links of the wireless mesh sub-network is reduced, and network throughput is improved.

The invention discloses a cross-domain cooperative resource allocation method for an optical fiber wireless convergence network. The method comprises the following steps of: dividing the network intoa plurality of branch network regions according to a proximity principle and a whole network approximate average principle; through a load-transferred ONU and wireless node cooperative region resourceredistribution mechanism, redistributing routes for influenced service requests of a dormant region according to service priorities, and selecting a maximum weight path as a current forwarding path of the service request and a source node MAP thereof based on constraint factors; an energy consumption model of a whole network is established through calculation of on-off energy consumption EONU ofONU equipment of an optical network unit, on-off energy consumption EMAP of MAP equipment of a wireless node and forwarding energy consumption Etrans of a service request, and then network service maximization earnings are obtained in combination with a network service earning model. According to the technical scheme provided by the invention, the ONU subjected to load transfer and the wireless node cooperatively sleep, and the route is redistributed according to the priority; and the service quality of the high-priority service is ensured on the basis of maximally reducing the network energyconsumption.

This invention discloses a fiber radio communication system of a simple structure and capable of providing full-duplex communication in the ROF communication system, which uses an electric mixer to generate mm wave signals at the central station and carries out double-side-band modulation to the signals to generate double-side-band modulated signals to be sent to the base station, takes the central carrier wave in the signals as the light carrier in the up link and applies a photomodulator to modulate data in the up link of a user mobile terminal onto the light carrier to be sent to the base station for treatment and picks up double-frequency one step side-band in the signals to generate necessary electric-mm waves by a photo-detector and emitted by an antenna.

The embodiment of the invention provides a distribution network regional smart terminal including a control chip and uplink communication modules. The uplink communication module includes an LTE230 module, a Wifi module, a GPRS module, a 4G module, and an optical communication module. The control chip is used for receiving the distribution data of distribution equipment and selecting different uplink communication modules to transmit the distribution data to a remote power distribution automation master station. The distribution network regional smart terminal flexibly adjusts the networking topological structure of the distribution communication terminal in different regions according to a distribution terminal deployment environment, achieves seamless access of distribution terminals in different regions and different types, significantly enhances the composite communication efficiency of wireless communication access technologies, and fiber wireless fusion access efficiency, reduces the distribution network communication system construction operation and maintenance cost, and improves the comprehensive utilization efficiency of a distribution network communication system.

The invention provides a processing method of a wireless access system based on fiber wireless on downgoing signals, which performs pre-distortion processing to digital intermediate frequency. The pre-distortion processing can compensate the non-linear distortion caused by a station amplifier and a photomodulator.

The invention discloses a network coding and transmission method for realizing transmission based on multiple paths in a software defined FiWi (Fiber Wireless) network. Function expansion is carried out on a flow table. A whole network is centrally controlled by a controller. The number of inserted redundant packets in a network coding process is determined through design of a dynamic adaptive algorithm. Coding packets are reasonably allocated on the multiple paths. The packet disorder problem in a multipath transmission process is solved. The network throughput is improved. The network delayis reduced.

The invention proposes a fiber optic repeater and frequency conversion relay and operation method thereof; wherein, the fiber optic repeater and frequency conversion relay is composed of a wireless transceiver module, a duplexer, a photoelectric conversion module, optical fibers and an optical splitter; the invention is characterized in that the fiber optic repeater and frequency conversion relay comprises a transmission control module, two line equalization delays, two wireless transceiver loops, a carrier frequency converter and a switching matrix, and is applicable to wireless communication relay transmission in conventional wireless communication system; so the fiber optic wireless relay system is ensured to provide wireless communication relay transmission service for wireless transceiver users in arbitrary position within the relay range; meanwhile, the fiber optic repeater and frequency conversion relay and operation method have small interference and are applicable to various covering requirements.

The invention discloses an OFDM radio-on-fiber communication system, which combines the radio-on-fiber communication technology with wireless OFDM technology, utilizes anti-multipath time-delay characteristic of OFDM signals and the characteristic of lower transmission speed of subcarrier and the like to resist the influence of dispersion on signals in optical fiber transmission and increases transmission distance. The OFDM signal and the radio-frequency sine wave signal are mixed to drive an intensity modulator so as to lead the continuous optical wave of the intensity modulator generated to a distributed feedback laser to realize suppressing modulation of the carrier; the optical carrier loaded with the OFDM signal is transmitted to a base station by the optical carrier; at the base station, firstly, a photoelectric detector converts the optical millimeter wave signal into the electric millimeter wave signal and finally the modulation of the OFDM signal is realized. The OFDM-over-fiber communication system also can be realized by using a dual-intensity modulator; the main working process is as follows: the distributed feedback laser generates continuous optical wave; the sine wave signal generated by a radio-frequency signal source drives the dual-intensity modulator; the suppressing modulation of the carrier is realized to the continuous optical wave; the OFDM signal generation module generates the OFDM signal; a single-arm intensity modulator loads the OFDM signal to the optical millimeter wave with suppressed carrier; and finally the OFDM signal is transmitted to the base station by the optical fiber. The millimeter wave generation method of the optical carrier OFDM signal and the radio-on-fiber communication system composed thereby can resist the influence of on signals in the optical fiber transmission, increase the transmission distance and reduce the cost of long-distance communication system.

The invention belongs to the technical field of radio over fiber communication, and particularly relates to a vector radio frequency signal generation system based on a polarization multiplexing intensity modulator. The system comprises a laser, a polarization beam splitter, a first radio frequency signal source, a second radio frequency signal source, a polarization multiplexing intensity modulator, a polarization beam coupler, an optical amplifier, an optical filter and a photoelectric detector which are connected in sequence, according to the invention, a polarization multiplexing intensitymodulator is combined with devices such as an optical filter and a photoelectric detector to generate a vector radio frequency signal; a photon synthesis method is adopted, and polarization multiplexing is utilized to overcome crosstalk of optical signals with different frequencies; one modulator bears RF signals with different frequencies and converts the RF signals into optical signals, the optical signals are transmitted through the optical fibers, the polarization directions of the two radio-frequency signals are orthogonal, and the PD has no interference, so that the system performance of optical fiber wireless converged communication is effectively improved, and huge advantages are brought into play in an access network which takes an ROF system as a main part in the future.

The present invention relating to the fields of microwave photonics, fiber wireless communication and the like, discloses a system for realizing the re-use of uplink and downlink wavelength of a fiber wireless system on the basis of a millimeter-wave signal generator. The system comprises a central station (92), a base station (91) and a transmission fiber. The present invention solves the problems of high system cost, dispersion attenuation, complex system structure and the like existing in the re-use process of wavelengths. Uplink re-use light carriers are obtained by using the third fiber grating (52), and the downlink re-use light carriers are obtained by using the fourth fiber grating (53), therefore, wavelength re-use of the system can be realized. An output terminal of an external modulator (81) of the base station is connected with the central station (92) through a sixth fiber grating (55) and an uplink transmission fiber (9); an output terminal of an external modulator (80) of the central station (92) is connected with the base station (91) through a fifth fiber grating (54) and a downlink transmission fiber (4), and a sideband of modulating signals is filtered, therefore, the problem of dispersion attenuation is solved.

The invention belongs to the technical field of optical fiber wireless communication, and particularly relates to a system for simultaneously providing wired and single sideband wireless services based on a single modulator. The system comprises a laser used for generating optical carriers, two signal generators used for generating base band signals, a local oscillator used for generating single-frequency electric carriers, a dual-polarization binary phase shift keying modulator used for modulating wired and wireless signals to two orthogonal polarization states of light respectively, and a phase shift keying modulator used for generating phase shift keying signals; a frequency multiplier, a frequency mixer, a power divider, a phase regulator, an electric amplifier and the like. Modulationof wired and single-sideband wireless signals can be completed by adopting the dual-polarization binary phase shift keying modulator, fusion of wired and single-sideband wireless services is realizedby utilizing a polarization multiplexing technology, and the problem of mutual crosstalk of wired and single-sideband wireless services at a receiving end is solved. By adjusting the bias voltage ofthe modulator and the phase difference of the radio frequency signal, single sideband modulation is directly realized, the use of an optical filter can be avoided, and the cost is saved.

The invention discloses a transmitting terminal, a fiber-optic wireless multi-carrier communication system and a signal processing method thereof. The transmitting terminal comprises: a continuous wave laser, the output end is connected to the input end of the polarization controller; the polarization controller is connected to the Mach-Zehnder output. The input of the modulator; the sinusoidal signal generator, the output is connected to the modulation end of the Mach-Zehnder modulator; the Mach-Zehnder modulator outputs the optical signal a at the output and is connected to the input of thefirst wavelength division multiplexer a first wavelength division multiplexer, an output terminal outputs a light wave signal and is connected to an input end of the dual modulation circuit; and a dual modulation circuit is configured to load two modulation frequencies on the light wave signal output by the first wavelength division multiplexer Modulation signal; the invention applies two modulation frequency modulation signals on the optical wave signal outputted by the first wavelength division multiplexer through the dual modulation circuit, thereby realizing the superposition and transmission of two channels of data by one optical signal, thereby improving the spectrum utilization rate and communication speed.

The invention relates to a fiber wireless communication system and a method for generating downlink multi-service millimeter wave. The system comprises a central station and a base station. The central station comprises a light source, a first modulation module and a second modulation module, wherein the light source is used for generating optical signals of single wavelength; the first modulation module uses a radio-frequency signal to carry out optical carrier suppression modulation for the optical signals to generate two optical carrier signals; and the second modulation module uses a radio-frequency signal and an intermediate-frequency signal carried with data information to carry out optical single-sideband carrier suppression modulation for the two optical carrier signals to generate a radio-frequency optical output signal. The base station is connected with the central station through a fiber, and comprises a filter module and a photoelectric conversion module, wherein the filter module filters unneeded middle components in the radio-frequency optical output signal; and the photoelectric conversion module carries out photoelectric conversion for the optical signal output by the filter module to output the multi-service millimeter wave. The system and the method have the advantages of simple structure, reliable performance and low cost.