Abstract: A connector assembly is provided which includes a first connector having a first housing and a second connector having a second housing. The first housing has two fixed portions positioned apart from one another in the transverse direction, an elastic portion passing between the two fixed portions and able to bend elastically in the longitudinal direction, and an engaging protruding portion formed on the elastic portion and able to be hooked in an engaging hole in the second housing. The engaging protruding portion is positioned between upper and lower edges of the elastic portion.

Abstract: Multipoint broadcasting relying on channel reciprocity in a TDD network requires that the broadcasters be calibrated. In the cases where the relative amplitude profiles and nonlinear phases are time-invariant or slow-varying, broadcaster calibration reduces to phase synchronization. Methods and apparatus are described that provide broadcaster calibration and phase synchronization with terminal feedback and overcome the drawbacks of self-calibration. The methods and apparatus are capable of calibrating hundreds of broadcaster antennas in massive antenna applications while maintaining an extremely low overhead. Applications of the described methods and apparatus include multipoint broadcasting in wireless networks, also known as coordinated multipoint transmission, or CoMP, in LTE-A (long-term evolution, advanced) networks, and distributed MIMO, massive MIMO, massive beamforming, etc., in other networks including 5G and 802.11.

Abstract: Multipoint broadcasting relying on channel reciprocity in a TDD network requires that the broadcasters be calibrated. In the cases where the relative amplitude profiles and nonlinear phases are time-invariant or slow-varying, broadcaster calibration reduces to phase synchronization. Methods and apparatus are described that provide broadcaster calibration and phase synchronization with terminal feedback and overcome the drawbacks of self-calibration. The methods and apparatus are capable of calibrating hundreds of broadcaster antennas in massive antenna applications while maintaining an extremely low overhead. Applications of the described methods and apparatus include multipoint broadcasting in wireless networks, also known as coordinated multipoint transmission, or CoMP, in LTE-A (long-term evolution, advanced) networks, and distributed MIMO, massive MIMO, massive beamforming, etc., in other networks including 5G and 802.11.

Abstract: Methods and apparatus of channel estimation using time-domain parameter extraction are disclosed. The wireless channel can be modeled by a multipath model with a limited number of parameters in the continuous time domain. Extracting the time-domain parameters and then reconstructing the channel yields channel estimates that have better accuracy. Time-domain parameter extraction also has lower computational complexity than existing methods.

Abstract: The present disclosure provides an electrical connector assembly which comprises: a mounting frame having a connector mounting space and at least one mating opening; a protective cover which can cover and latch with and uncover the mounting frame and comprises an outer cover made of a hard material and an inner cover made of a soft material, an inner surface of the outer cover is engaged with an outer surface of the inner cover, the protective cover is further provided with a strap, the strap connects with the mounting frame so as to allow the protective cover to move between an open position and a close position; and at least one connector having a connector mating portion, the connector is received and fixed in the connector mounting space, and the connector mating portion is exposed via the mating opening. The protective cover of the electrical connector assembly of the present disclosure has the advantage of being easy to operate, feel good and beautiful in appearance.

Abstract: Methods and apparatus of channel estimation using time-domain parameter extraction are disclosed. The wireless channel can be modeled by a multipath model with a limited number of parameters in the continuous time domain. Extracting the time-domain parameters and then reconstructing the channel yields channel estimates that have better accuracy. Time-domain parameter extraction also has lower computational complexity than existing methods.

Abstract: A connector assembly is provided which includes a first connector having a first housing and a second connector having a second housing. The first housing has two fixed portions positioned apart from one another in the transverse direction, an elastic portion passing between the two fixed portions and able to bend elastically in the longitudinal direction, and an engaging protruding portion formed on the elastic portion and able to be hooked in an engaging hole in the second housing. The engaging protruding portion is positioned between upper and lower edges of the elastic portion.

Abstract: The present disclosure provides an electrical connector assembly which comprises: a mounting frame having a connector mounting space and at least one mating opening; a protective cover which can cover and latch with and uncover the mounting frame and comprises an outer cover made of a hard material and an inner cover made of a soft material, an inner surface of the outer cover is engaged with an outer surface of the inner cover, the protective cover is further provided with a strap, the strap connects with the mounting frame so as to allow the protective cover to move between an open position and a close position; and at least one connector having a connector mating portion, the connector is received and fixed in the connector mounting space, and the connector mating portion is exposed via the mating opening. The protective cover of the electrical connector assembly of the present disclosure has the advantage of being easy to operate, feel good and beautiful in appearance.

Abstract: An electrical connector assembly and a connecting member thereof, the connecting member comprises: a base portion having an upper surface and a lower surface which are opposite. A first connecting portion comprising two first protruding ribs spaced apart from each other and protruding upwardly from the upper surface of the base portion and two first latching grooves respectively provided at opposite inner sides of the two first protruding ribs, and the two first latching grooves extends along a front-rear direction. A second connecting portion comprising four upright extending walls spaced apart from each other and extending downwardly out from the lower surface of the base portion and four first latching flanges respectively extending horizontally out from the four upright extending walls. A resilient latching arm extending out from one end of the base portion, having a first positioning portion provided to an upper surface thereof and a second positioning portion provided to a lower surface thereof.

Abstract: Methods and apparatus of channel estimation using time-domain parameter extraction are disclosed. The wireless channel can be modeled by a multipath model with a limited number of parameters in the continuous time domain. In the discrete time domain, the multipath model leads to channel impulse responses that have a limited number of channel taps with non-negligible energy. Extracting the time-domain parameters and then reconstructing the channel yields channel estimates that have better accuracy. Time-domain parameter extraction also has lower computational complexity than existing methods.

Abstract: An electrical connector assembly and a connecting member thereof, the connecting member comprises: a base portion having an upper surface and a lower surface which are opposite. A first connecting portion comprising two first protruding ribs spaced apart from each other and protruding upwardly from the upper surface of the base portion and two first latching grooves respectively provided at opposite inner sides of the two first protruding ribs, and the two first latching grooves extends along a front-rear direction. A second connecting portion comprising four upright extending walls spaced apart from each other and extending downwardly out from the lower surface of the base portion and four first latching flanges respectively extending horizontally out from the four upright extending walls. A resilient latching arm extending out from one end of the base portion, having a first positioning portion provided to an upper surface thereof and a second positioning portion provided to a lower surface thereof.

Abstract: An electrical connector assembly and a connecting member thereof, the connecting member comprises: a base portion having an upper surface and a lower surface which are opposite. A first connecting portion comprising two first protruding ribs spaced apart from each other and protruding upwardly from the upper surface of the base portion and two first latching grooves respectively provided at opposite inner sides of the two first protruding ribs, and the two first latching grooves extends along a front-rear direction. A second connecting portion comprising four upright extending walls spaced apart from each other and extending downwardly out from the lower surface of the base portion and four first latching flanges respectively extending horizontally out from the four upright extending walls. A resilient latching arm extending out from one end of the base portion, having a first positioning portion provided to an upper surface thereof and a second positioning portion provided to a lower surface thereof.

Abstract: Large-dimension MIMO and multipoint broadcasting in new generation of wireless networks create high demand for various types of pilots in transmission signals for channel estimation, data demodulation, synchronization, etc. More pilots, as in existing networks, use more resources and thus diminish the network capacity. Methods and apparatus of heterogeneous pilots are disclosed. A heterogeneous pilot has its own signal characteristics that are different from the primary information-bearing signals in the network. Heterogeneous pilots can be spread-spectrum signals in an OFDM-based wireless network. Heterogeneous pilots use no network resources, and can be as many as desired, and can be designed to have versatile utilities. Also described are methods and apparatus of heterogeneous pilot cancellation that minimizes the interference of heterogeneous pilots on the primary information-bearing signals.

Abstract: MU-MIMO and CoMP have potentials to increase the cell capacity by many folds. Interferences and channel feedback overhead, however, severely limits such potentials. Method of reference signal-based grid of beams (RS-GOB) is described. RS-GOB distributes the effective antennas of a base station into multiple beams, thereby significantly reducing the feedback overhead of CoMP and making effective use of CoMP to turn the interferences into cooperating useful signals. RS-GOB also reduces the need for small HetNet cells, which mitigates the interferences of small HetNet cells on macro cells.

Abstract: A description is given of an apparatus that includes a division unit configured to receive a data stream and to divide the received data stream into a plurality of data segments. The apparatus further includes a plurality of first CRC check units, wherein each of the first CRC check units is configured to perform a first CRC check of a respective one of the plurality of data segments, the plurality of first CRC checks being performed concurrently, and wherein each of the first CRC check units is configured to perform a second CRC check based on an output of the respective first CRC check unit.

Abstract: Most wireless channels are sparse, so sparse channel-based methods can be used for channel estimation and feedback with much better estimation accuracy and much lower feedback overhead. However, certain wireless channels can be non-sparse, for which sparse channel-based methods may cause degraded estimation quality and increased feedback overhead. Means of detecting the channel sparseness are described that provide simple and effective channel sparseness indicators and safeguard against the mismatch between non-sparse channels and sparse channel-based methods. Various fallback options can be used under non-sparse channels such that estimation degradation and feedback overhead are both minimized. Fake multipath removal in continuous time-domain parameter extraction, a sparse channel-based method, is also described that further improves estimation quality and reduces feedback overhead.

Abstract: Methods and apparatus of channel feedback are disclosed. In OFDM systems, the channel is acquired in the frequency domain. A generic multipath model for wireless channels, however, reveals that the time-domain parameters of the channel require much smaller data than the frequency-domain representation of the channel. Means to extracting the time-domain parameters from the frequency-domain channel samples are described for both the continuous time domain and the discrete time domain. Refinements of the time-domain parameters via minimizing a frequency-domain matching error are also described, which further improve the quality of the channel feedback and reduce the feedback overhead. Channel feedback with the time-domain parameters requires only a small fraction of the feedback overhead that is needed by existing channel feedback schemes, and maintains consistently superior performances over wireless channels of various delay spreads, short or long.

Abstract: MU-MIMO and CoMP have potentials to increase the cell capacity by many folds. Interferences and channel feedback overhead, however, severely limits such potentials. Method of reference signal-based grid of beams (RS-GOB) is described. RS-GOB distributes the effective antennas of a base station into multiple beams, thereby significantly reducing the feedback overhead of CoMP and making effective use of CoMP to turn the interferences into cooperating useful signals. RS-GOB also reduces the need for small HetNet cells, which mitigates the interferences of small HetNet cells on macro cells.

Abstract: An electrical connector assembly and a connecting member thereof, the connecting member comprises: a base portion having an upper surface and a lower surface which are opposite. A first connecting portion comprising two first protruding ribs spaced apart from each other and protruding upwardly from the upper surface of the base portion and two first latching grooves respectively provided at opposite inner sides of the two first protruding ribs, and the two first latching grooves extends along a front-rear direction. A second connecting portion comprising four upright extending walls spaced apart from each other and extending downwardly out from the lower surface of the base portion and four first latching flanges respectively extending horizontally out from the four upright extending walls. A resilient latching arm extending out from one end of the base portion, having a first positioning portion provided to an upper surface thereof and a second positioning portion provided to a lower surface thereof.

Abstract: Methods and apparatus are described that provide carrier-phase difference (CPD) acquisition via signaling protocols between communicating devices. The random CPD between two disjoint devices can be measured by the signaling protocols described herein. With the availability of the CPD, a device is also able to acquire its outgoing channel (transmit channel) information, thus avoiding the channel information feedback that is being considered and/or practiced in some wireless communications systems. Also described are methods and apparatus that use the CPD to synchronize the clocks of two or more devices and that track the time-variations of the CPD for reliable CPD measurement and tracking loop operations. Applications of the described methods and apparatus include wireless multipoint broadcast systems, also known as coordinated multipoint transmission, or CoMP, in LTE (long-term evolution)-advanced systems, point-to-point wireless MIMO systems, and general wireless device networks.