427 results about "Space division multiplexing" patented technology

A method for communication over a wireless local area network (WLAN) includes receiving uplink signals from a plurality of stations in the WLAN. Responsively to the uplink signals, a set of the stations is selected for inclusion in a spatial multiplexing group. Downlink signals are transmitted simultaneously to the stations in the set using spatial division multiplexing (SDM).

In the environment of a communication area including a SDM-compatible mobile station for space division multiplex transmission and a SDM-uncompatible mobile station not compatible with space division multiplex transmission, a base station having a plurality of antennas and capable of adaptively changing directivity performs allocation of a mobile station which simultaneously performs space division multiplex transmission (SDM) and space division multiplex access (SDMA) by using a predetermined space division multiplex transmission evaluation criterion and a space division multi access evaluation criterion. By using this radio communication method, it is possible to use the spatial degree of freedom at its maximum and provide a radio communication system having an improved communication capacity.

A method and apparatus for spatial multiplexing and demultiplexing of radio signals. A multichannel transmitter and receiver is integrated in a base station and coupled to an antenna array. Using digital radio signals containing previously known or non-Gaussian sequences and arranged in frames, the spatial information about each mobile unit is estimated on the basis of the signal received by the receiver for the reception and transmission frequencies. This is done by known sequences or by blind source separation methods. The respective paths of each mobile unit with the power above a predetermined threshold is isolated by spatial filtering in the presence of multiple channel paths in order to provide spatial demultiplexing. Simultaneously, the intended signal is transmitted in the direction of the main path of each mobile unit while protecting each mobile unit from signals transmitted in the direction of other mobile units by spatial filtering with cancelling constraints in order to provide spatial multiplexing.

The present invention provides a method and a system for transmitting the correct/wrong reply message. In a carrier-aggregated frequency division dual (FDD) system, which a base station is provided with a PDSCH scheduled to a certain UE in a plurality of downlink component carriers, PUCCH channels corresponding with the feedback state of the ACK/NACK reply message are respectively selected for two transmission blocks in each downlink component carrier, and the corresponding 2-bit information in the mapping relationship is transmitted on the PUCCH format 1b. According to the invention, the feedback state on each transmission block is transmitted with a mode of channel selection and PUCCH format 1b. Thus the UE can feed back the feedback information of all transmission blocks of the received descending component carrier, therefore the reducing of the system throughput performance is prevented and the system throughput is guaranteed. Simultaneously, when the base station configuration UE is in a receiving mode of space division multiplexing, the channel condition of the UE is better in general, and the detectability of the ACK/NACK reply message is guaranteed.

A multi-protocol, multi-band array antenna system may be used in Radio Frequency Identification (RFID) system reader and sensory networks. The antenna array may include array elements with an integrated low noise amplifier. The system may employ digital beam forming techniques for transmission and steering of a beam to a specific sensor tag or group of tags in an cell. The receive beam forming network is optimized for detecting signals from each sensor tag. Narrow and wideband interferences may be excised by an interference nulling algorithm. Space division multiplexing may be used by the antenna system to enhance system processing capacity.

The invention discloses a transmission method of uplink control signaling and a device thereof, relating the field of mobile communication and solving the problem of lacking a mechanism for transmitting uplink control signaling on space division multiplexing (SDM) PUSCH. The method comprises: determining the uplink control signaling target length corresponding to each transmission block or code stream; respectively obtaining the multiplexing information after uplink control signaling to be transmitted on each transmission block or code stream are multiplexed with uplink data; and transmitting the multiplexing information corresponding to each transmission block or code stream on PUSCH. The technical scheme provided by the invention is suitable for the transmission of uplink control signaling in LTE systems.

The invention discloses a method for transmitting an uplink control signaling on a physical uplink shared channel, comprising the following steps: when two transmission blocks/code streams exist on the physical uplink shared channel (PUSCH), mapping the uplink control signaling onto a corresponding layer of one of the transmission blocks/code streams for transmission. The invention simultaneously discloses a device for transmitting the uplink control signaling in the physical uplink shared channel, which comprises a mapping device and a transmission unit, wherein the mapping device is used for mapping the uplink control signaling onto the corresponding layer of one of the transmission blocks/code streams when two transmission blocks exist on the physical uplink shared channel (PUSCH); and the transmission unit is used for transmitting the uplink control signaling. The invention effectively solves the problems for the transmission of the uplink signaling on the PUSCH under the condition that the PUSCH adopts space division multiplexing in an LTE-A system, and guarantees the capacity of the data, and as channel quality corresponding to the transmission blocks selected by various manners is relatively better generally, the transmission quality of the uplink control signaling can be guaranteed.

The invention provides a space division multiplexing Mach-Zehnder cascade fiber interferometer and a measurement method thereof. The space division multiplexing Mach-Zehnder cascade fiber interferometer is composed of a wide-spectrum light source, a photodetector, a coupler, a single-mode connection optical fiber, an optical fiber sensor, a continuous-variable optical delay device, and a reflector, wherein the optical fiber sensor is composed of a Mach-Zehnder interferometer and forms a cascade optical fiber sensor array or a network. The wide-spectrum light source and a photodetector are connected with the optical fiber sensor through the coupler to form a sensor network; and the sensor network is connected with the continuous-variable optical delay device and the reflector through the coupler and is used for enquiring and demodulating the optical fiber sensor. The space division multiplexing Mach-Zehnder cascade fiber interferometer solves the problem of breakage of the optical fiber sensor array, improves the anti-damage characteristics of the optical fiber sensor array and the network and solves the temperature compensation problem in the measurement process. The space division multiplexing Mach-Zehnder cascade fiber interferometer has the advantages of simple interferometer structure, easy implementation, improved measurement reliability and low cost, and better facilitates the technology generalization and popularization.

A space-division multiplexing optical coherence tomography apparatus arid system is provided, in one embodiment, the system includes a light source, a reference arm. and a sample arm. The sample arm splits the sampling light into a plurality of sampling beams which may be scanned simultaneously onto a surface of a sample. An optical delay may be introduced into the sampling beams before scanning. A plurality of reflected light signals returned from the sample is collected. In one arrangement, the signals may be combined to produce a single reflected light signal The reflected light sigtial(s) and a reference signal are combined to produce an interference signal comprising data representative of digitized images captured of the actual object, in one embodiment, a single sample arm may be used for scanning and collecting image data. A related method is also provided.

A system that incorporates teachings of the present disclosure may include, for example, identifying a stereoscopic preference from a user profile associated with a user of a viewing apparatus, receiving a stereoscopic media program, generating an adapted media program by adapting one or more presentation aspects of the stereoscopic media program according to the stereoscopic preference, and presenting at a presentation device the adapted media program according to a time-division multiplexing or space-division multiplexing scheme for viewing by way of the viewing apparatus. Other embodiments are disclosed and contemplated.

The invention provides a system and a method for transferring upstream control signals on a physical ascending sharing channel; the method comprises the steps of: respectively coding the upstream control signals needing to be transferred and the data information which a transmission block corresponds to, intercepting the corresponding coded information according to the target length; when a transferring block corresponds to a plurality of layers, the information of each layer to be transferred on the transferring block is interweaved; the interweaved information is transferred on the layer which the physical upstream sharing channel (PUSCH) corresponds to; the information on each layer comprises an upstream control signaling information; or the information on each layer comprises the data information and upstream control signaling. The technical scheme of the invention can realize the transmission of the upstream control signals on the PUSCH when the PUSCH adopts the space division multiplexing in the LTE-A system.

A space division multiplexed (SDM) transmission system that includes at least two segments of transmission media in which a spatial assignment of the two segments is different is provided. For example, the SDM transmission may include a first segment of transmission media having a first spatial assignment and a second segment of transmission media having a second spatial assignment, wherein the first spatial assignment differs from the second spatial assignment. An example method obtains an optical signal on a first segment of transmission media having a first spatial assignment and forwards the optical signal on a second segment of transmission media with a different spatial assignment. The transmission media may be a multi-core fiber (MCF), a multi-mode fiber (MMF), a few-mode fiber (FMF), or a ribbon cable comprising nominally uncoupled single-mode fiber (SMF).

A method is provided for detecting the skew between parallel light signals generated from a serial data stream. The method can be used with polarization multiplexed signal, as well as with wavelength division multiplexed signals, spatial division multiplexed signals, phase modulated signals, or intensity modulated signals. The method can be used with direct detection schemes as well as with coherent detection schemes. The method is provided with: imprinting dips between a fixed number of transmitted symbols of the parallel signals; detecting an electrical signal related to the dips for each parallel signal; and comparing the electrical signals in delay.

The invention discloses a closed-loop self-adaptive transmission method used for an uplink of an advanced long-term evolution system. According to the channel status information of the uplink, a mobile terminal selects an appropriate signal transmission mode for adapting to the change of channels. The closed-loop self-adaptive transmission method comprises the steps: a. a base station receives the signals transmitted by a multi-antenna channel, and carries out channel estimation on the received signals at a pilot frequency symbol to obtain link channel parameters in a transmission bandwidth; b. according to the obtained channel parameters, the base station carries out combined selection of ranks (the number of space division multiplexing layers) and precoded matrixes based on the mutual information amount performance criteria, and then carries out modulation coding mode selection according to the mean signal-to-noise ratio mapping criteria, and finally sends the sequence numbers of the selected rank instructions (RI) and the precoded matrixes in a codebook, namely precoded matrix instructions (PMI) and channel quality instructions (CQI) corresponding to the selected modulation coding modes to a feedback channel; and c. the mobile terminal carries out self-adaptive transmission by utilizing the parameters such as RIs, PMIs and CQIs obtained by the feedback channel.

Embodiments of the invention relate to beamforming antennas such as can be used in space division multiplexing systems. Space division multiplexing can be used to increase data capacity in wireless networks by enabling different base stations to transmit signals within the same frequency band. Each antenna beam can potentially be used to establish a communication link within an area of wireless coverage, and other communication links established on other antenna beams then represent interference to that user. In order to reduce interference, narrow beamwidths are desirable. These are typically achieved by increasing the aperture of the antenna in the azimuth plane, and in arrangements that require finely divided angular sectors, a greater number of antennas will be required to give three hundred and sixty degree coverage. As a result, there is potentially a large increase in the total surface area of antennas which is undesirable, as it leads to increased wind loading of an antenna tower. Embodiments of the invention provide an arrangement in which data are transmitted from a first transmitter to a first receiver using a first antenna beam, and data are transmitted from a second transmitter to a second receiver using a second antenna beam. The first antenna beam is formed by splitting the signal from the first transmitter into two parts with a first phase relationship between the parts, each part being connected to an antenna. A second antenna beam is formed by splitting the signal from the second transmitter into two parts with a second phase relationship between the parts, each part being connected to one of the two antennas. An advantage of embodiments of the invention is that data can be transmitted from different transmitters at the same frequency without interference, while presenting a smaller antenna aperture than is required with conventional systems.

The invention discloses a multi-beam ad hoc network channel access control method, aiming at providing an access control method which has a high channel utilization rate and can improve the network performance. The method of the invention is implemented through the following technical scheme: for a distributed multi-beam scene, combining the characteristics of multi-beams, utilizing the broadcastchannel characteristics of an omni-directional network and the high bandwidth and high directivity characteristics of a directional network, using the short message protocol interaction between nodes,and assisting to complete the high-rate parallel transmission of multiple nodes on a directional link; using space division multiplexing among the nodes to achieve the concurrent communication between multiple transmission nodes and multiple receiving nodes; when a network cluster head node receives RTS frames of all other nodes, running a multi-beam ad hoc network channel access allocation algorithm; and searching an optimal transceiving node pair set in each time slot, finding an edge set with the maximum network capacity as a channel access allocation result of each node in the next directional link time slot, and further implementing the simultaneous multi-transmission and multi-reception of the multiple nodes at the same frequency.

A wireless base station comprises a response vector calculation unit (561), an RSSI measuring unit (562), an MSE calculation unit (563), an FD calculation unit (564) and the like, and those units obtain an index showing communication quality of at least one of two mobile stations that are intended to be space-division multiplexed. According to the index, a control unit (80) judges the suitability of the two mobile stations for space-division multiplexing and performs space-division multiple access communication when judging suitable. The effect achieved with this construction is that the wireless base station maintains quality of communication between the wireless base station and mobile stations at a certain satisfactory level when performing space-division multiple access communication.

The invention discloses a rotation constellation diagram based coding and decoding method for a spatial multiplex multi-aerial system. According to the method, the rotation constellation diagram based coding and decoding method and the spatial multiplex multi-aerial system are combined, a transmission signal is subjected to serial and parallel conversion at a transmitting end and a mapped onto a modulation constellation diagram, all constellation points rotate by using origin points as circle centers at set angles and reversely rotate at the same set angles after signs are detected at a receiving end, a signal sequence is modulated through the constellation diagram and is subjected to parallel and serial conversion, and the signal is output. By the method, the problem of error rate increase caused by constellation point overlap in a related channel is solved, and the error rate of the spatial multiplex multi-aerial system in the related channel is reduced better on the premise of not increasing system bandwidth resources and unnecessarily reducing transmission rate. Compared with the traditional spatial multiplex multi-aerial system, only a rotation factor is multiplied at the transmitting end and the receiving end, and the coding method is low in hardware cost and excellent in error code performance.

The invention discloses a general purpose computation virtualization implementation method based on dynamic library interception. For overcoming the defects of an existing virtual machine technology in supporting general purpose computation, all functions relevant to the general purpose computation in a virtual environment are called and redirected to a non-virtual environment by intercepting and redirecting a general purpose computation runtime library in real time. Because the non-virtual environment has the general purpose computation capacity, the actual general purpose computation tasks will be completed and the results will be returned to the virtual environment. It is totally transparent for a user in the virtual environment due to the method; on the basis of virtualization of the dynamic library, one physical GPU is virtualized into multiple GPUs logically through the space division multiplexing and time division multiplexing technologies for a GPU pool with GPU resources as allocation objects, and the method supports that one GPU is multiplexed by multiple users.