摘要:
An antenna includes a substrate having a first layer, a second layer, a third layer and a fourth layer, and an antenna unit having a first pattern being of a helix-shaped and printed on the first layer, a second pattern being of a meandering shaped and printed on the second layer, a third pattern being of a meandering shaped and printed on a third layer, and a fourth pattern being of a helix-shaped and printed on the fourth layer. The first pattern, the second pattern, the third pattern and the fourth pattern are of a serial connection. The free end of the first pattern connects a feeding point. The free end of the fourth pattern connects a grounding point. Thus, the antenna has advantages of compact size and low cost, due to the antenna unit printed on the substrate and the pattern of the antenna unit.
摘要:
An antenna includes a substrate having a first layer, a second layer, a third layer and a fourth layer, and an antenna unit having a first pattern being of a substantially coiled shape and printed on the first layer, a second pattern being of a meandering shaped and printed on the second layer, a third pattern being of a meandering shaped and printed on a third layer, and a fourth pattern being of a substantially coiled shaped and printed on the fourth layer. The first pattern, the second pattern, the third pattern and the fourth pattern are of a serial connection. The free end of the first pattern connects a feeding point. The free end of the fourth pattern connects a grounding point. Thus, the antenna has advantages of compact size and low cost, due to the antenna unit printed on the substrate and the pattern of the antenna unit.
摘要:
A method for determining a loading of a wideband communications channel in a wireless communications system includes: setting up a loading table for the wideband communications channel comprising a plurality of narrow band communications channels; obtaining channel characteristics of the plurality of narrow band communications channels; deciding on a number of data streams and a practical bandwidth of the wideband communications channel for a data transmission transaction and selecting one or more peer communications devices for receiving the data streams; completing the data transmission transaction with the one or more peer communications devices; updating the loading table with the information about the practical bandwidth of the wideband communications channel, the number of data streams and duration of the data transmission transaction; and computing the loading by using the information in the loading table in accordance with a pre-determined formula.
摘要:
A method for transiting basic service sets (BSSs) in a wireless communications system is provided. A wireless station first detects an integrity of a real-time flow from an access point in a first BSS. The wireless station then sends a request frame to the access point. The request frame comprises a communication condition of the wireless station. The access point responds with information of a plurality of APs and a set of parameters that used to select the APs. The wireless station then determines which AP to be associated according to the information of the plurality of APs and the communication quality of the wireless station.
摘要:
A method of supporting incompatible channelization in a wireless communications system is provided. A coordinating device determines a first set of physical parameters of a first wireless channel. The first set of physical parameters includes a channel bandwidth, a central frequency, a transmit power limit, and a modulation and coding scheme. The coordinating device establishes communication with a first set of communications devices over the first wireless channel. The coordinating device then broadcasts a channel-adjustment message and determines a protection period. The channel-adjustment message comprises a set of instructions on how to adjust to a second set of physical parameters of a second wireless channel. A second set of communications devices adjust physical parameters based on the channel-adjustment message. Finally, the coordinating device communicates with the second set of communications devices over the second wireless channel during the protection period.
摘要:
A method is provided for sharing a communications channel in a wireless communications system. A network coordinating device of the wireless network obtains a first path quality information of each of a first set of one or more communications paths between a first pair of communications devices. The coordinating device also obtains a second path quality information of each of a second set of communications paths between a second pair of communications devices. The coordinating device then determines one or more co-existing communications paths based on the first and the second path quality information in accordance with a predetermined rule. Finally, the coordinating device sends channel resource allocation information to the first pair and the second pair of communications devices to use corresponding co-existing communications paths such that the first pair and the second pair of communications devices communicate over the communications channel during a period of time concurrently.
摘要:
A method for allocating radio resources by a coordinating wireless communications device in a wireless communications network. The wireless communications network occupies a plurality of narrow-band channels. The method includes: obtaining supported narrow-band channels supported by a wireless communications device joining the wireless communications network, the supported narrow-band channels including a first subset of the narrow-band channels; partitioning the plurality of narrow-band channels into a set of non-overlapping operating channels, each of the non-overlapping operating channels including a second subset of the narrow-band channels; assigning the wireless communications device to an assigned non-overlapping operating channel, wherein the bandwidth of the assigned non-overlapping operating channel is less or equal to the bandwidth of the supported narrow-band channels supported by the wireless communications device; and allocating the radio resources to the wireless communications device, wherein the wireless communications device exchanges data with other wireless communications devices.
摘要:
A communication system includes a trainee communications device and one or more trainer communications devices. The trainee communications device announces a first period of time for beamforming training, switches a receiving antenna pattern to a sector and stays in the sector for a second period of time. The trainer communications devices transmit one or more predetermined bit sequences in the first period of time. The predetermined bit sequences are transmitted in at least one sector. Each of the predetermined bit sequences carries an identifier identifying the transmitting trainer communications device. The trainee communications device further estimates channel characteristics and computes receiving antenna weighting vectors of the trainer communications devices by using the received predetermined bit sequences, respectively, and the trainer communications devices obtain pertinent information including the estimated channel characteristics and receiving time of the predetermined bit sequences about beamforming training from the trainee communications device.
摘要:
A method is provided for sharing a communications channel in a wireless communications system. A network coordinating device of the wireless network obtains a first path quality information of each of a first set of one or more communications paths between a first pair of communications devices. The coordinating device also obtains a second path quality information of each of a second set of communications paths between a second pair of communications devices. The coordinating device then determines one or more co-existing communications paths based on the first and the second path quality information in accordance with a predetermined rule. Finally, the coordinating device sends channel resource allocation information to the first pair and the second pair of communications devices to use corresponding co-existing communications paths such that the first pair and the second pair of communications devices communicate over the communications channel during a period of time concurrently.
摘要:
A drying machine includes a hot air blower, a housing divided horizontally into plural long chambers having an open upper side, a closed bottom and two longitudinal sides bored with through holes, a screw conveyor respectively positioned in each long chamber, and a motor to rotate all the screw conveyors, and a sending-out screw conveyor positioned on the bottom of the housing. Each screw conveyor has an inner screw and an outer screw twisting in opposite direction for conveying, squeezing, mixing and stirring material at the same time dried by hot air coming from the blower. Material falls down from a funnel on the upper side of the housing and gradually falling down through the through holes and an outlet in an end of the bottom of the highest long chamber and then into a second highest long chamber and so on to the lowest portion of the housing to be conveyed by the sending-out screw conveyor to an exit through which dried material falls down through for collected.