Abstract: A scanning-type optical antenna is provided, which includes a housing, a fine-tune mirror, a light signal emitter, a light signal receiver, a scanning light receiver and a rotational mechanism. The housing includes a window. The scanning light receiver disposed on the housing receives an input sector scanning light from a target antenna to generate plural light speckles. The rotational mechanism mounts the housing and adjusts the deflection angle between the housing and the target antenna according to the light speckles. The fine-tune mirror is disposed outside the housing and corresponding to the window. The light signal emitter inside the housing transmits an output signal light to the target antenna after being reflected by the fine-tune mirror through the window. The input signal light of the target antenna is transmitted to the light signal receiver inside the housing after being reflected by the fine-tune mirror and passing through the window.

Abstract: A scanning-type optical antenna is provided, which includes a housing, a fine-tune mirror, a light signal emitter, a light signal receiver, a scanning light receiver and a rotational mechanism. The housing includes a window. The scanning light receiver disposed on the housing receives an input sector scanning light from a target antenna to generate plural light speckles. The rotational mechanism mounts the housing and adjusts the deflection angle between the housing and the target antenna according to the light speckles. The fine-tune mirror is disposed outside the housing and corresponding to the window. The light signal emitter inside the housing transmits an output signal light to the target antenna after being reflected by the fine-tune mirror through the window. The input signal light of the target antenna is transmitted to the light signal receiver inside the housing after being reflected by the fine-tune mirror and passing through the window.

Abstract: An optical wireless unit including an optical circulator, a collimator, and a lens is provided. The collimator is configured to receive an optical signal via a first port of the optical circulator. The collimator is coupled with a second port of the optical circulator and is configured to transmit the optical signal into air to form a first free space optical wireless signal. The lens is coupled with the collimator and a third port of the optical circulator and is configured to receive and focus a second free space optical wireless signal to the collimator. The first free space optical wireless signal has a wavelength ?0, the second free space optical wireless signal has a wavelength ?N, and N is a positive integer.

Abstract: A multipath switching system comprising of an adjustable phase shift array includes, an adjustable phase shift array module and a control module. The adjustable phase shift array module receives a radio-frequency (RF) signal, and includes at least one RF switch, at least one coupler and at least one phase shifter. The at least one RF switch, the at least one coupler and the at least one phase shifter form a number of transmission paths. The transmission paths respectively produce the processed transmission RF signals corresponding to different phase shifts to an antenna array. The control module controls the at least one RF switch and the at least one phase shifter of the adjustable phase shift array module, so that the antenna array radiates a wireless signal whose direction is corresponding to a predetermined angle in space polar coordinates.

Abstract: The disclosure provides an electronic device including a coupler, a transceiver, and a control circuit. The coupler generates a coupled downlink signal according to a downlink signal from a head-end unit. The transceiver switches between the transmission of a downlink signal and the reception of an uplink signal according to a control signal. The control circuit receives the coupled downlink signal, generates a status counting signal according to the power status of the coupled downlink signal, and generates the control signal according to the status counting signal. Only when the level of the coupled downlink signal is lower than an amplitude threshold level with a duration longer than a status counting time, the control circuit converts the status counting signal from a first logic level to a second logic level opposite to the first logic level. Otherwise, the control circuit maintains the status counting signal on the first logic level.

Abstract: According to one embodiment of a method for interference suppression in radio-over-fiber communication systems, the method uses a mode selection module to continuously update real time information of at least two mobile stations and determine to enter a cross mode or a single mode. In the single mode, when a mobile station approaches a switching point, a single mode command is issued to control at least one first specific remote antenna unit (RAU). In the cross mode, when an immediate cross condition is a new cross condition, a new cross mode table is generated, and when the position of any one mobile station of the at least two mobile stations cross a threshold, a cross mode command is issued to control at least one second specific RAU according to a corresponding cross mode table.

Abstract: The disclosure provides an electronic device including a coupler, a transceiver, and a control circuit. The coupler generates a coupled downlink signal according to a downlink signal from a head-end unit. The transceiver switches between the transmission of a downlink signal and the reception of an uplink signal according to a control signal. The control circuit receives the coupled downlink signal, generates a status counting signal according to the power status of the coupled downlink signal, and generates the control signal according to the status counting signal. Only when the level of the coupled downlink signal is lower than an amplitude threshold level with a duration longer than a status counting time, the control circuit converts the status counting signal from a first logic level to a second logic level opposite to the first logic level. Otherwise, the control circuit maintains the status counting signal on the first logic level.

Abstract: A multipath switching system comprising of an adjustable phase shift array includes, an adjustable phase shift array module and a control module. The adjustable phase shift array module receives a radio-frequency (RF) signal, and includes at least one RF switch, at least one coupler and at least one phase shifter. The at least one RF switch, the at least one coupler and the at least one phase shifter form a number of transmission paths. The transmission paths respectively produce the processed transmission RF signals corresponding to different phase shifts to an antenna array. The control module controls the at least one RF switch and the at least one phase shifter of the adjustable phase shift array module, so that the antenna array radiates a wireless signal whose direction is corresponding to a predetermined angle in space polar coordinates.

Abstract: The present invention relates to an adaptive automatic repeat-request apparatus and method for an MIMO system including a transmitter and a receiver. The apparatus comprises an adaptive retransmission component located at the transmitter. The adaptive retransmission component uses a special frame structure that divides the transmission data in a frame into several sections according to the number of transmission antennas, and adds an individual error detecting code within each section. The transmission data are sent to the receiver through the several antennas. The receiver responds to the adaptive retransmission component with feedback information of an acknowledgement or negative acknowledgement signal, and detected signal strength of data for each transmission antenna. After receiving the signal strength of transmission data, the retransmission signal vector for error data is determined.

Abstract: A method for inter-carrier interference cancellation is provided. A time-domain received signal is detected to obtain information of an inter-symbol interference free region. Multiple cyclic useful symbols are obtained from the time-domain received signal according to the information of the inter-symbol interference free region and a set of multi-step windowing coefficients is generated. Adjusted cyclic useful symbols are obtained by multiplying the cyclic useful symbols by the set of multi-step windowing coefficients, respectively, and then combined in a time domain to obtain a time-domain combination signal. The inter-carrier interference of each of sub-carriers of the time-domain combination signal is centralized on neighboring D sub-carriers. The time-domain combination signal is transformed into a frequency-domain received signal. The frequency-domain received signal and its corresponding channel response matrix are divided into overlapped signal blocks according to D.

Abstract: This invention provides a transmission architecture of transmitter which includes a forestage module, a pilot insertion, a scramble selector, and a backstage module. A frequency domain data symbol is transmitted by the forestage module. A pilot signal is inserted in the frequency domain data symbol by the pilot insertion, and a frequency domain pilot symbol is produced. The frequency domain pilot symbol performed a scramble operation and a select operation with certain scramble patterns by the scramble selector, and a requirement symbol is produced. The requirement symbol is converted into the transmitted signal by the backstage module. Because the use of the scramble operation and the select operation from the scramble selector, the transmission architecture of transmitter provided by this invention can both reduce the PAPR and increase the multi-cell diversity gain in an OFDM single frequency network system.

Abstract: A method for transmitting signals using orthogonal frequency division multiplexing (OFDM) symbols in a wireless communication system, includes: selecting a plurality of OFDM symbols as a symbol group in time dimension; and multiplying a scrambling pattern with the symbol group.

Abstract: A transmission method of a wireless signal including the following steps is provided. Multiple orthogonal frequency division multiplexing (OFDM) symbols carried by multiple subcarriers are generated according to a data signal. A scrambling pattern including multiple scrambling symbols is generated, wherein the scrambling symbols respectively correspond to the subcarriers in the frequency domain. The scrambling symbols corresponding to two contiguous subcarriers are correlated. The scrambling symbols are utilized to encode the OFDM symbols carried by the corresponding subcarriers.

Abstract: A method for inter-carrier interference cancellation is provided. A time-domain received signal is detected to obtain information of an inter-symbol interference free region. Multiple cyclic useful symbols are obtained from the time-domain received signal according to the information of the inter-symbol interference free region and a set of multi-step windowing coefficients is generated. Adjusted cyclic useful symbols are obtained by multiplying the cyclic useful symbols by the set of multi-step windowing coefficients, respectively, and then combined in a time domain to obtain a time-domain combination signal. The inter-carrier interference of each of sub-carriers of the time-domain combination signal is centralized on neighboring D sub-carriers. The time-domain combination signal is transformed into a frequency-domain received signal. The frequency-domain received signal and its corresponding channel response matrix are divided into overlapped signal blocks according to D.

Abstract: The present invention relates to an adaptive automatic repeat-request apparatus and method for an MIMO system including a transmitter and a receiver. The apparatus comprises an adaptive retransmission component located at the transmitter. The adaptive retransmission component uses a special frame structure that divides the transmission data in a frame into several sections according to the number of transmission antenna, and adds an individual error detecting code within each section. The transmission data are sent to the receiver through the several antennas. The receiver responds to the adaptive retransmission component feedback information of an acknowledgement or negative acknowledgement signal, and detected signal strength of data for each transmission antenna. After the receiving of the signal strength of transmission data, the retransmission signal vector for error data is determined.

Abstract: An apparatus capable of inter-carrier interference (ICI) cancellation in a communication system, the apparatus comprising a detecting module configured to detect an ISI-free region free from inter-symbol interference (ISI) in a guard interval (GI) of a symbol in time domain, a windowing module configured to provide a windowing function in time domain, identifying a weight value in the windowing function based on the ISI-free region, and multiplying a channel response related to the symbol by the windowing function in time domain to obtain a windowing result, wherein the windowing result comprises a first portion corresponding to the ISI-free region and a second region corresponding to an end portion of the symbol, the end portion and the ISI-free region having the same length, and a combination module configured to combine the first portion and the second portion of the windowing result in time domain.

Abstract: A method for ICI self-cancellation and ICI reconstruction and cancellation is introduced. The method includes receiving input signals; receiving boundary information regarding a length q of an ISI-free region of the received signals; selecting a plurality of ISI-free signals from the received signals; combining the plurality of ISI-free signals to provide combined signals z(n); performing FFT operations on the combined signals to provide output signals Z(k); reconstructing ICI based on the output signals Z(k) and the length q of the ISI-free region of the input signals r(n) in order to provide an estimated ICI; subtracting the estimated ICI from the output signals Z(k) to provide a cancelled signal W(k); performing a channel estimation for the cancelled signal W(k); equalizing the cancelled signal W(k) to provide an equalized signal; and de-mapping the equalized signal to provide a de-mapped signal d(k).

Abstract: A transmission method of a wireless signal including the following steps is provided. Multiple orthogonal frequency division multiplexing (OFDM) symbols carried by multiple subcarriers are generated according to a data signal. A scrambling pattern including multiple scrambling symbols is generated, wherein the scrambling symbols respectively correspond to the subcarriers in the frequency domain. The scrambling symbols corresponding to two contiguous subcarriers are correlated. The scrambling symbols are utilized to encode the OFDM symbols carried by the corresponding subcarriers.

Abstract: This invention provides a transmission architecture of transmitter which includes a forestage module, a pilot insertion, a scramble selector, and a backstage module. A frequency domain data symbol is transmitted by the forestage module. A pilot signal is inserted in the frequency domain data symbol by the pilot insertion, and a frequency domain pilot symbol is produced. The frequency domain pilot symbol performed a scramble operation and a select operation with certain scramble patterns by the scramble selector, and a requirement symbol is produced. The requirement symbol is converted into the transmitted signal by the backstage module. Because the use of the scramble operation and the select operation from the scramble selector, the transmission architecture of transmitter provided by this invention can both reduce the PAPR and increase the multi-cell diversity gain in an OFDM single frequency network system.

Abstract: An apparatus capable of inter-carrier interference (ICI) cancellation in a communication system, the apparatus comprising a detecting module configured to detect an ISI-free region free from inter-symbol interference (ISI) in a guard interval (GI) of a symbol in time domain, a windowing module configured to provide a windowing function in time domain, identifying a weight value in the windowing function based on the ISI-free region, and multiplying a channel response related to the symbol by the windowing function in time domain to obtain a windowing result, wherein the windowing result comprises a first portion corresponding to the ISI-free region and a second region corresponding to an end portion of the symbol, the end portion and the ISI-free region having the same length, and a combination module configured to combine the first portion and the second portion of the windowing result in time domain.