53results about How to "Improve signal reception quality" patented technology

A method for receiving data at different frequencies includes receiving a first transmission packet including data at a first carrier frequency, and receiving a second transmission packet comprising data at a second carrier frequency. The method further includes maintaining communication with transmission entities which transmit the first and second transmission packets, and identifying reception quality of the first and second transmission packets. In addition, a method for retransmitting subpackets includes transmitting a first subpacket of a packet transmission from at least two transmitting entities. Upon receiving a non-acknowledgement NACK generated responsive to the first subpacket, the method further includes alternating transmission of subsequent subpackets from different transmitting entities. Upon receiving an acknowledgement ACK generated responsive to any subpackets of the packet transmission, the method further includes transmitting a first subpacket of a new packet transmission.

A multi-domain radio broadcast multicast network system based on a cooperative communication technology and a method thereof. The system comprises a basic overlay domain, a relay enhancement domain and an expanded service domain. The basic overlay domain composed of a radio broadcast multicast single frequency network is taken as a core, the overlay range of the radio broadcast multicast single frequency network is expanded by the relay enhancement domain so as to realize seamless overlay of the radio broadcast multicast single frequency network and a homogeneous radio broadcast multicast network and accomplish a fusion of the radio broadcast multicast single frequency network and an heterogeneous radio broadcast multicast network. The system acquires a diversity-multiplexing gain of radio transmission by the cooperative communication technology, thus solving a bottle-neck problem of radio broadcast data service transmission among different domains. The method and the system can expand the overlay range of the radio broadcast multicast network, enhance system capacity and service quality, realize convenient networking, and satisfy high-quality and high-speed transmission demand of the next generation of the radio broadcast multicast.

The invention provides a visible-light diversity-reception method and system. The method includes: carrying out diversity reception on visible-light signals through a plurality of photoelectric detectors and converting the visible-light signals into electrical signals; carrying out A/D conversion on the diversity-reception electrical signals of different circuits through an A/D conversion circuit; carrying out moving average filtering on the signals, which undergo the A/D conversion, of different circuits; combining the signals, which undergo the filtering, on the different circuits; carrying out signal clock recovery processing on the combined signals so that final signals are obtained. In the visible-light diversity-reception method and device, the plurality of photoelectric detectors are adopted to substitute a single photoelectric detector for data reception so that under a condition that transmission-end power is not changed, a reception-end bit error rate which increases with the increase of a communication distance can be effectively reduced and thus a signal reception quality of the system is improved significantly; at the same time, the diversity-reception method is capable of reducing effects of reception-end signal fading so that a comparatively high diversity gain is obtained and reception sensitivity is improved.

This invention provides a user signal transmitting method in an OFDMA system, where all the time-frequency grids of each timeslot are divided into sub-channels, each sub-channel comprises N_f sub-carriers overlapping in time, N_f≧4, and in each sub-channel, a maximum value of a frequency interval between adjacent sub-carriers is no less than three times of a minimum value thereof; and when a user message is sent, comprising: generating a modulating signal; allocating a time-frequency grid set which is a union set of sub-channel, where the sub-channel's quantity is determined by the user message's size, and the sub-channel's time-frequency position is selected according to a rule; and mapping the modulating signal to the time-frequency grid set to generate a frequency-domain signal; performing IFFT on the frequency-domain signal to generate a time-domain signal for transmission. This invention also provides a corresponding user signal receiving method, user signal transmitting and receiving apparatus and access system.

The invention provides a portable paraboloid satellite earth antenna capable of being rapidly erected and folded, which mainly comprises an antenna reflection panel, a supporting and adjusting mechanism of the antenna reflection panel, a feed source tuner assembling unit and a supporting and adjusting mechanism of the feed source tuner assembling unit. The antenna is characterized in that the supporting and adjusting mechanism of the antenna reflection panel comprises a chassis, a first support, a second support, a facing bar, a third support, a locating support, an elevation regulating stem lower part, an elevation regulating stem upper part and a first dished lock-screw, wherein the first support and the second support are fixedly connected with the chassis; the facing bar is fixedly connected with the antenna refection panel, the third support is fixedly connected with the facing bar, one end of the locating support is fixedly connected with the facing bar and the other end of the locating support is flexibly connected with the first support; and the elevation regulating stem lower part is flexibly connected with the second support, one end of the elevation regulating stem upper part is flexibly connected with the third support, the other end of the elevation regulating stem upper part is flexibly sheathed with the elevation regulating stem lower part, and the first dished lock-screw is connected with the elevation regulating stem upper part. The invention is especially suitable for temporary sites and outdoor sites and has the advantages of compact structure, rapid andflexible erection and folding, convenient carrying and strong practical applicability.

The invention discloses a vehicle-mounted combined antenna oscillator, a dwarf type vehicle-mounted antenna and a method for manufacturing the vehicle-mounted combined antenna oscillator. The vehicle-mounted combined antenna oscillator comprises a base body and multiple oscillator elements which are formed at the surface of the base body. The multiple oscillator elements comprise inductor elements, capacitor elements and wireless communication oscillator elements. The inductor elements and the capacitor elements are coupled to be suitable for receiving a radio signal. The wireless communication oscillator elements are suitable for wirelessly transmitting/receiving a wireless communication signal. With application of the technical scheme, multiple types of antenna configuration can be contained by utilizing the combined antenna oscillator through a smaller size, the receiving frequency band gap of each antenna oscillator is large and thus mutual interference is low so that the effect of acquiring great signal receiving quality can be realized through the smaller size.

A receiving device for a global positioning system and an antenna structure thereof. The receiving device includes a housing, a circuit board and the antenna structure. The circuit board is disposed inside the housing and has a ground portion and a signal feeding portion. The antenna structure is disposed inside the housing and includes a metal plate, a first electric conducting element and a second electric conducting element. The metal plate is used for receiving a GPS signal. The first electric conducting element has one end coupled to the metal plate, and the other end coupled to the ground portion of the circuit board. The second electric conducting element for feeding the GPS signal to the circuit board has one end coupled to the metal plate, and the other end coupled to the signal feeding portion of the circuit board.

A method for forming a frame in a wireless communication system is provided. In the method, a plurality of preamble symbols are disposed. Then, a signal symbol is disposed at a predetermined position among the plurality of preamble symbols. At least one of data symbols is disposed after the plurality of preamble symbols.

A signal compensation circuit and associated method dynamically compensate for signal baseline wandering in a transmission line. The compensation circuit has a detection circuit and a correction circuit. The detection circuit first compares a transmission signal with a reference level and generates a comparison result. The correction circuit then corrects the transmission signal according to the comparison result. The compensation circuit can adjust its compensation over time based on the quality of the transmission signal.

The invention discloses a virtual cell carrier allocation method based on maximum SINR. The method comprises the following steps: determining an initial service virtual cell, judging whether the initial service virtual cell belongs to existing virtual cells, if not, determining target carriers, calculating a small base station set using the target carriers to serve the existing virtual cells, determining a signal-to-noise ratio, and selecting the target carriers. According to the invention, through mutual cooperation between the virtual cells, small base stations with better service quality are made to exit from certain original virtual cells, and corresponding component carriers are used to serve users in a virtual cell which the base stations are newly added to. The signal receiving quality of cell-edge users and the system average spectral efficiency can be improved, and the system capacity is enhanced.

A handheld device and a disposition method of a planar antenna are provided. The handheld device includes an appearance, a system ground plane, and the planar antenna. The appearance includes a via. The system ground plane is disposed inside the appearance. The planar antenna is disposed on the appearance and extended to an inner surface of the appearance through the via so as to be coupled to the system ground plane. Thereby, the performance of the planar antenna is improved.

The invention discloses a combined antenna oscillator and a dwarf vehicle-mounted antenna using the same. The combined antenna oscillator comprises an AM/FM oscillator part, a communication oscillator part and a WIFI oscillator part which are arranged at intervals, wherein each oscillator part comprises a base body and a conductive component, the conductive component is formed on a surface of the base body, the conductive component formed on the surface of the base body of the AM/FM oscillator part comprises an induction component and a capacitance component, the induction component and the capacitance component are coupled to suitably receive a wireless electric signal, the conductive components formed on the surface of the base bodies of the communication oscillator part and the WIFI oscillator part comprise wireless communication oscillator components, and the wireless communication oscillator components are suitably used for emitting/receiving wire communication signals in a wireless way. By the combined antenna oscillator, various antenna configurations can be contained with relatively small volume, each antenna oscillator is large in difference of a receiving frequency band and low in mutual interference, and the effect of acquiring favorable signal receiving quality with relatively small volume can be achieved.