Abstract: Mechanisms may be used for aggregating acknowledgement (ACK), block ACK (BA) and/or short packets transmissions for multi-user (MU) wireless communication systems. Aggregation mechanisms may be used for uplink (UL) and/or downlink (DL) orthogonal frequency division multiple access (OFDMA), and/or UL/DL multiple-user multiple input multiple output (MU-MIMO) transmissions, for example. Multi-user short packets may be aggregated and/or simultaneously transmitted for DL, UL, or peer-to-peer (P2P) transmissions.

Abstract: A WTRU may include a memory and a processor. The processor may be configured to receive beam grouping information from a gNB or transmission and reception point (TRP). The beam grouping information may indicate a group of beams that the WTRU may report using group-based reporting. The group-based reporting may be a reduced level of reporting compared to a beam-based reporting. The group-based report may include measurement information for a representative beam. The representative beam may be one of the beams in the group or represents an average of the beams in the group. Alternatively, the representative beam may be a beam that has a maximum measurement value compared to other beams in the group. The group-based report may include a reference signal received power (RSRP) for the representative beam and a differential RSRP for each additional beamin the beam group.

Abstract: A water-absorbing cyclone dust cup for secondary dust-air separation comprises a dust cup cover body and a dust cup main body. The dust cup main body comprises a cup body portion, a primary cyclone arranged in an opening of the dust cup main body, and a secondary cyclone comprising a secondary cyclone main body provided with a ventilation hole defined in a center. At least one air guiding portion is arranged on a bottom end surface of the secondary cyclone main body. The air guiding portions comprise spiral air guiding plates, spiral air guiding passages formed by the spiral air guiding plates around the ventilation hole, and air guiding passage baffles enclosing first ends of the spiral air guiding plates, the spiral air guiding passages are formed by spiral longitudinal extension along the center line direction of the ventilation hole.

Abstract: A water-absorbing cyclone dust cup for secondary dust-air separation comprises a dust cup cover body and a dust cup main body. The dust cup main body comprises a cup body portion, a primary cyclone arranged in an opening of the dust cup main body, and a secondary cyclone comprising a secondary cyclone main body provided with a ventilation hole defined in a center. At least one air guiding portion is arranged on a bottom end surface of the secondary cyclone main body. The air guiding portions comprise spiral air guiding plates, spiral air guiding passages formed by the spiral air guiding plates around the ventilation hole, and air guiding passage baffles enclosing first ends of the spiral air guiding plates. the spiral air guiding passages are formed by spiral longitudinal extension along the center line direction of the ventilation hole.

Abstract: The embodiments of the present circuit and method disclose a circuit to bypass a target circuit when an open status is detected. The present circuit may comprise a sample circuit, a monitoring circuit and a bypass circuit. The sample circuit may comprise a capacitor coupled to the target circuit. The monitoring circuit may be coupled to the capacitor and may have an output configured to generate an output signal selectively indicating the open status. The bypass circuit may comprise a switch, wherein the switch has a control terminal coupled to the output of the monitoring circuit and wherein the switch may be configured to be selectively turned ON to bypass the target circuit in accordance with the output of the monitoring circuit.

Abstract: The embodiments of the present circuit and method disclose a circuit to bypass a target circuit when an open status is detected. The present circuit may comprise a sample circuit, a monitoring circuit and a bypass circuit. The sample circuit may comprise a capacitor coupled to the target circuit. The monitoring circuit may be coupled to the capacitor and may have an output configured to generate an output signal selectively indicating the open status. The bypass circuit may comprise a switch, wherein the switch has a control terminal coupled to the output of the monitoring circuit and wherein the switch may be configured to be selectively turned ON to bypass the target circuit in accordance with the output of the monitoring circuit.

Abstract: Designs of optical devices for attenuating a light signal are disclosed. According to embodiment, an attenuator includes a screw and a light blocker, wherein the light blocker has only translational movements when the screw is screwed in or out. To facilitate the light signal in and out, a first collimator to receive a light beam, and a second collimator to output the light beam, wherein the light beam is attenuated by the light blocker when the light is transmitted from the first collimator to the second collimator.

Abstract: Systems and methods for generating a reference voltage are disclosed. In one embodiment, an output voltage is generated that is the sum of a desirable reference voltage component and an undesirable voltage component. An additional voltage component that tends to be equal and opposite in sign to the undesirable voltage component is added to the output voltage, the additional voltage component thereby tending to cancel the undesirable voltage component.

Abstract: An optical alignment device holds fiber collimators in place with extremely good mechanical and environmental stability. The device includes a ball with a hole traversing the ball, an upper clamping block with a first inner concave spherical surface and a lower clamping block with a second inner concave spherical surface. The hole includes a shape that can accommodate or contact an optical component whose alignment is to be controlled. The ball, together with the enclosed optical component is firmly held between the first and second inner concave surfaces of the clamping blocks, which are tightened against the ball with screws. When firmly clamped within the concave surfaces, the ball is prevented from accidental movement but can still rotate about any axis to align the optical component. Once alignment is achieved, the optical component and the ball are secured in place by epoxy, glue, solder or other suitable adhesive.

Abstract: A high power supply ripple rejection (PSRR) internally compensated low drop-out voltage regulator using an output NMOS pass device. The voltage regulator uses an inverting inter-stage variable gain amplifier to adjust its gain in response to a load current passing through the output NMOS device such that as the load current decreases, the gain increases, wherein a second pole associated with the voltage regulator is pushed above a unity gain frequency associated with the voltage regulator. The inverting inter-stage variable gain amplifier is further operational to adjust its gain in response to a load current passing through the power NMOS device such that as the load current increases, the gain decreases, wherein the unity gain bandwidth associated with the loop formed by a compensation capacitor is kept substantially constant.

Abstract: A high power supply ripple rejection (PSRR) internally compensated low drop-out voltage regulator using an output NMOS pass device. The voltage regulator uses an inverting inter-stage variable gain amplifier to adjust its gain in response to a load current passing through the output NMOS device such that as the load current decreases, the gain increases, wherein a second pole associated with the voltage regulator is pushed above a unity gain frequency associated with the voltage regulator. The inverting inter-stage variable gain amplifier is further operational to adjust its gain in response to a load current passing through the power NMOS device such that as the load current increases, the gain decreases, wherein the unity gain bandwidth associated with the loop formed by a compensation capacitor is kept substantially constant.

Abstract: An optical alignment device holds fiber collimators in place with extremely good mechanical and environmental stability. The device includes a ball with a hole traversing the ball, an upper clamping block with a first inner concave spherical surface and a lower clamping block with a second inner concave spherical surface. The hole includes a shape that can accommodate or contact an optical component whose alignment is to be controlled. The ball, together with the enclosed optical component is firmly held between the first and second inner concave surfaces of the clamping blocks, which are tightened against the ball with screws. When firmly clamped within the concave surfaces, the ball is prevented from accidental movement but can still rotate about any axis to align the optical component. Once alignment is achieved, the optical component and the ball are secured in place by epoxy, glue, solder or other suitable adhesive.