79 results about "Selection diversity" patented technology

Certain embodiments of the invention may be found in a method and system for antenna selection diversity with prediction. An antenna diversity system may use information that it has stored on the antenna selection process in previous frames to predict the starting receiving antenna and the starting transmission antenna for the next frame. The prediction may be based on which antennas were selected in previous frames or may be based metrics associated with performance of the antennas. Prediction may be based on a majority polling scheme of previously selected antennas in a determined number of previous frames. Prediction may also be based on a weighted sum of at least one selection metric for all antennas in a determined number of previous frames. Antenna prediction provides a significant performance improvement by reducing the processing and operational overhead in cases where a transmit or a receive antenna dominates.

Disclosed are systems and methods which provide high bandwidth data communication with respect to a large coverage area using smart antenna and / or directional antenna (referred to herein as multi-beam antenna) technology. Circuitry may be provided at a WLAN AP to provide selection of particular antenna beams used in the downlink and / or uplink, control of multicast transmission, control of unicast transmission, and to provide antenna pattern shaping techniques. Embodiments implement multi-beam antenna technology with little or no hardware modifications to AP circuitry. Other embodiments implement multi-beam technology using radio front-end and / or radio hardware modifications to AP circuitry. Various diversity techniques may be implemented, such as selection diversity, maximum ratio combining, and equal gain combing. To provide desired antenna pattern shaping, phase offsets with respect to a signal as transmitted in each antenna beam may be employed.

An antenna selection diversity apparatus capable of shortening, when antennas are switched in frame units, a measuring time of antennas and shortening the time of selecting an optimal antenna from among a plurality of antennas on standby. In this apparatus, an antenna selection section (109) selects one of three antennas as an antenna in actual use for a period of a plurality of frames consecutively according to selection priority stored in an antenna information storage section (108) and gives an instruction for selecting one of two antennas on standby as an antenna to be measured once at a period of a plurality of frames to an antenna selection switch (104). When the reception level of the antenna in actual use measured by a reception level measuring section (107) falls below the reception level of the antenna to be measured a predetermined number of times consecutively, the antenna selection section (109) gives an instruction for selecting the antenna to be measured as the antenna in actual use to the antenna selection switch (104).

The invention discloses a variable frequency air conditioner and a control method and a control device thereof. The control method is applied to an outdoor unit of the variable frequency air conditioner; no communication exists between the outdoor unit and an indoor unit; and the control method comprises the following steps: a variable frequency compressor is controlled to operate according to aninitial operation frequency; the continuous operation time and the stop working frequency of the variable frequency compressor are monitored; and the operation frequency of the variable frequency compressor is controlled according to the continuous operation time and the stop working frequency. The operation frequency of the variable frequency compressor can be adjusted according to the continuousoperation time and the stop working frequency of the compressor, so that the output capacity of the compressor is changed, no communication between the indoor and outdoor units is guaranteed when theadvantages of higher comfort of the variable frequency air conditioner, higher user experience and the like are considered, the mated use is not needed, and the user selection diversity is improved.

The invention discloses a temperature gradient energy storage heat exchanger. The temperature gradient energy storage heat exchanger comprises a front clamping plate, a rear clamping plate and at least two sets of plates overlapped between the front clamping plate and the rear clamping plate to form fluid channels in a sealed mode in sequence. The four corners of the front clamping plate, the fourcorners of the rear clamping plate and the four corners of the plates are provided with circular fluid through holes correspondingly. The spaces inside the at least sets of the plates are filled withthe same phase change materials. The phase change temperatures of the phase change materials in the different sets of the plates decrease progressively in the fluid flowing direction. The temperaturegradient energy storage heat exchanger gives full play to the advantages of a plate heat exchanger such as high heat transfer coefficient, small occupied space, light weight and convenient manufacturing and achieves the purpose of improving the energy utilization efficiency through combination with the phase change materials with the characteristics of large heat storage capacity, environmental protection and selection diversity. The operational suitability is improved through independent cold and hot fluid channels. The temperature gradient energy storage heat exchanger has the advantages ofbeing large in energy storage density, convenient to operate and high in adaptability and can be applied to the fields of solar thermal collectors, heat pump heat collectors and industrial waste heatrecovery.

An antenna selection diversity apparatus capable of shortening, when antennas are switched in frame units, a measuring time of antennas and shortening the time of selecting an optimal antenna from among a plurality of antennas on standby. In this apparatus, an antenna selection section (109) selects one of three antennas as an antenna in actual use for a period of a plurality of frames consecutively according to selection priority stored in an antenna information storage section (108) and gives an instruction for selecting one of two antennas on standby as an antenna to be measured once at a period of a plurality of frames to an antenna selection switch (104). When the reception level of the antenna in actual use measured by a reception level measuring section (107) falls below the reception level of the antenna to be measured a predetermined number of times consecutively, the antenna selection section (109) gives an instruction for selecting the antenna to be measured as the antenna in actual use to the antenna selection switch (104).

A method and system for antenna selection diversity with dynamic gain control. A receiver selects a starting antenna and dwells on it until an incoming signal is detected. An AGC is applied on the received signal and an estimate of the received power is determined for the starting antenna. The receiver may dwell on other antennas if the signal in the first antenna is not strong enough for signal processing. The gain of an antenna may be set by the gain and power levels of the previously dwelled-on antennas and / or by a power coupling factor that exists between the antennas in an antenna switch. The receiver switches through the remaining antennas as long as necessary to select at least one of the antennas for signal processing. Dynamically adjusting the gain of antennas in a diversity system provides a more accurate and efficient antenna selection scheme.

Certain embodiments of the invention may be found in a method and system for antenna selection diversity with prediction. An antenna diversity system may use information that it has stored on the antenna selection process in previous frames to predict the starting receiving antenna and the starting transmission antenna for the next frame. The prediction may be based on which antennas were selected in previous frames or may be based metrics associated with performance of the antennas. Prediction may be based on a majority polling scheme of previously selected antennas in a determined number of previous frames. Prediction may also be based on a weighted sum of at least one selection metric for all antennas in a determined number of previous frames. Antenna prediction provides a significant performance improvement by reducing the processing and operational overhead in cases where a transmit or a receive antenna dominates.

An obscuration ‘information’-aided mechanism controls which of a plurality of spatially diverse antennas having different views of a satellite is to be coupled to a receiver, by comparing respective spatial maps of quantized visibility values, representative of the abilities of the antennas to see the satellite, with information representative of the pointing directions of the antennas. The antenna having the best view of the satellite is selected.

The invention discloses a multifunctional garment sewing machine which comprises a rack and a control system, wherein a worktable and a rotating mechanism are arranged on the rack; a plurality of working areas are formed in the worktable; the rotating mechanism comprises a rotating disc; the rotating disc is arranged in the middle of the worktable; a first rotating shaft which rotates along the rotating disc is longitudinally arranged on the rotating disc; the first rotating shaft is composed of a plurality of equally divided intervals; the number of the intervals is equal to that of the working areas; the bottom of each interval is connected with the rotating disc by virtue of a Y-axis transmission mechanism so as to realize Y-direction movement of the intervals on the rotating disc; a second rotating shaft is transversely arranged on each interval; a plurality of working groups with different using functions are arranged on the second rotating shaft; the plurality of working groups are respectively uniformly and fixedly distributed on the second rotating shaft by taking the second rotating shaft as an axis and are positioned just above the worktable; and function switching of the working groups is realized by virtue of rotation of the second rotating shaft. According to the invention, the rotating mechanism is combined with the plurality of working groups, so that function selection diversity and automatic operation are realized.

A receiving diversity apparatus and method for a mobile station in an HDR mobile communication system measures C / I values of pilot channels on respective antennas, measures a C / I value of in-phase combined pilot channel, and then selectively performs one of a selection diversity receiving operation and an in-phase combining receiving operation according to the measured C / I values. An optimal diversity receiving status is then maintained according to changes of a presently received pilot channel, and the optimal diversity receiving operation between the selection diversity receiving operation and the in-phase combining diversity receiving operation is selected at a starting point of the pilot channel.

The invention relates to methods for scheduling at least one out of K transmission channels k with respective Nt,k transmission interfaces and respective Nr,k reception interfaces for the transmission of data symbols that are matrix or vector modulated, the method comprising calculating a respective Channel Quality Indicator (CQI) qk for at least one of the K transmission channels, and scheduling at least one of the K transmission channels for the transmission of the matrix or vector modulated data symbols, wherein the scheduling is at least partially based on the calculated CQIs qk. The invention further relates to devices, transmitting stations, wireless communication systems, computer programs and computer program products.