Abstract: An unfreeze faucet structure includes a watering control valve having a body; a control shaft, an upper ceramic member, and a lower ceramic member connected with the body; a valve seat locked to the body; wherein the control shaft includes a watering cavity and a positioning groove mounted in a lower section thereof, the watering cavity includes a check element and a stopping unit installed therein, the check element includes a disk-shaped cover arranged on a bottom end thereof, the cover includes a first stop loop fitted to a peripheral side thereof, between the cover and the watering cavity is defined with a spring, the stopping unit includes a trench disposed therearound to contact with the first stop loop, the control shaft includes a second stop loop fitted on an outer periphery thereof and a third stop loop arranged therearound to engage with an inner wall of the watering cavity.

Abstract: A method for multi-channel transmission with multiple frequency segments comprises the steps of: determining a plurality of non-contiguous frequency segments from an available frequency band of a communication system, wherein each frequency segment comprises a plurality of contiguous channels; determining available channels from the channels in the plurality of non-contiguous frequency segments, wherein the number of available channels is less than or equal to the number of total channels in the plurality of non-contiguous frequency segments; determining a primary channel from the available channels; performing channel bonding technique on the available channels; and performing multi-channel transmission by performing dynamic channel selection technique on the available channels.

Abstract: A method of arranging a packet in a wireless communication system includes a preamble sequence and a data sequence. The preamble sequence includes a legacy training field (L-TF), a legacy signal field (L-SIG), a very high throughput signal field (VHT-SIG), a very high throughput short training field (VHT-STF) and at least one very high throughput long training field (VHT-LTF). The method includes generating a first VHT-SIG field and a second VHT-SIG field according to the VHT-SIG field; and arranging the L-TF field, the L-SIG field, the first VHT-SIG field, the VHT-STF field, one of the at least one VHT-LTF fields, the second VHT-SIG field and the rest of the at least one VHT-LTF fields in a predetermined sequence.

Abstract: A method for clustering multiple stations for a MIMO communication system comprises the steps of: assigning a plurality of stations of a MIMO communication system to a plurality of clusters, wherein each station is assigned to at least one cluster, and at least one cluster is assigned with more than one station; and assigning the plurality of clusters to a plurality of sets, wherein each cluster is assigned to a set.

Abstract: A method of reducing a signal peak to average power ratio (PAPR) for a transmission channel in a wireless communication system is disclosed. The transmission channel is divided into a plurality of channel segments, and the method includes calculating PAPRs corresponding to the plurality of channel segments by a plurality of phase rotation vectors; selecting a plurality of specified phase rotation vectors from the plurality of phase rotation vectors according to the calculated PAPRs; and using one of the plurality of specified phase rotation vectors to rotate a phase of a signal to be transmitted.

Abstract: A method and system is disclosed for grouping the multiple stations connected to an access point (AP). The system and method comprise sending a sounding packet to a plurality of stations, wherein the stations may be all or part of the stations that are located within the range of the AP. The stations that receive the sounding packets respond to the AP, and the AP determines the channel state information (CSI) from the responses. According to the CSI, the AP divides the multiple stations into several groups. According to an embodiment of the present invention, a confirmation step is performed to each group of stations, respectively. The AP sends a second sounding packet to each group of stations, and verifies the CSI between each station group by group. Therefore, the method and system provides for monitoring the validation of each group by periodically sending sounding packets to each group.

Abstract: The present invention discloses a phase rotating method for a wireless local area network (WLAN) device, which utilizes a channel including a plurality of sub-channels. The phase rotating method includes steps of generating a plurality of data sequences corresponding to the plurality of sub-channels, and making the plurality of data sequences with phase rotations according to a plurality of angles corresponding to the plurality of sub-channels. The channel is a non-contiguous channel.

Abstract: A method for determining signal phase rotation of sub-channels within a contiguous transmission bandwidth comprises the steps of: determining a fundamental set of phase rotations; performing a cyclic shift operation for the fundamental set of phase rotations to generate a cyclic-shifted set of phase rotations; multiplying the cyclic-shifted set of phase rotations by a complex constant to generate a final set of phase rotations; and determining the phase rotation of each sub-channel within the contiguous transmission bandwidth according to the final set of phase rotations.

Abstract: The present invention discloses a multi-user (MU) downlink and downlink transmission method for a communication system. The communication system includes an access point (AP) and a plurality of stations. The MU transmission method includes steps of the AP deciding a first group of stations in a first scheduling period based on a channel condition, and the AP and the first group of stations performing simultaneously transmission during a MU media access control period.

Abstract: The present invention disclose a pilot signal determination method for a wireless communication system. The wireless communication system utilizes a plurality of sub-carriers. The pilot signal determination method includes steps of generating at least one vector corresponding to at least one sub-channel; and determining a plurality of pilot signals according to the at least one vector.

Abstract: A communication method for a MIMO communication system comprises the steps of: transmitting a plurality of first streams modulated in a non space division multiplexing manner from a transmitter to a plurality of receiving stations; and transmitting a plurality of second streams following the plurality of first streams modulated in a space division multiplexing manner from the transmitter to the plurality of receiving stations. Each of the first streams comprises a legacy short training field, a legacy long training field, a legacy signal field and at least a very high throughput signal field, and each of the first streams has the same length. Each of the second streams comprises a very high throughput short training field, a plurality of very high throughput long training fields and a data field, and each of the second streams has the same length.

Abstract: The present invention discloses a multi-user (MU) transmission method for a multiple input multiple output (MIMO) transmission system comprising a first station and a plurality of second stations. The MU transmission method includes the step of the first station performing simultaneous transmission to a first group of stations of the plurality of second stations in a first transmission interval.

Abstract: A wireless transmission method comprises the steps of: determining transmission time slots and start antenna indexes of a plurality of stations in a spatial division multiple access system according to the number of antennas of the plurality of stations; broadcasting a control frame signal to the plurality of stations and waiting for requests to transmit signals from the plurality of stations, wherein the control frame signal includes the transmission time slots and start antenna indexes of the plurality of stations; receiving the requests to transmit signals from the plurality of stations; and broadcasting a clear to transmit signal to the plurality of stations based on the received request to transmit signals. The requests to transmit signals of the plurality of stations, which are transmitted based on the transmission time slots and start antenna indexes of the plurality of stations, conform to a multi-input multi-output transmission standard of the access point.

Abstract: A watering control valve comprises a housing including two opposite elongated outlets fixed on a middle section of a peripheral side thereof; a shaft member inserted to the housing and an upper end thereof extends out of the housing; an upper ceramic member received in the housing and located at a lower side of the shaft member, and including two openings fixed on two symmetrical positions thereof, and including two recesses formed on a peripheral side thereof; a lower ceramic member contacting with the upper ceramic member and including two bores secured on two symmetrical positions thereof, and including two tabs formed on a peripheral side thereof to be retained in the housing; characterized in that the shaft member includes a watering chamber having a cavity to receive a spring, and includes a check element and a sealing pad installed therein.

Abstract: An unfreeze faucet structure includes a watering control valve having a body; a control shaft, an upper ceramic member, and a lower ceramic member connected with the body; a valve seat locked to the body; wherein the control shaft includes a watering cavity and a positioning groove mounted in a lower section thereof, the watering cavity includes a check element and a stopping unit installed therein, the check element includes a disk-shaped cover arranged on a bottom end thereof, the cover includes a first stop loop fitted to a peripheral side thereof, between the cover and the watering cavity is defined with a spring, the stopping unit includes a trench disposed therearound to contact with the first stop loop, the control shaft includes a second stop loop fitted on an outer periphery thereof and a third stop loop arranged therearound to engage with an inner wall of the watering cavity.

Abstract: A signal processing circuit in a transmitter of a communication system comprises an appending circuit, a scrambler, an FEC encoder and a stream parser. The appending circuit is configured to divide a packet data string into a plurality of divided data strings, append a predetermined string to the tail of each divided data string, and output the appended data strings sequentially. The scrambler is configured to perform a scramble operation for the appended data strings. The FEC encoder is configured to sequentially encode the output data strings of the scrambler into convolutional code-words complying with the requirements of a MIMO communication system. The stream parser is configured to forward the convolutional code-words to at least a stream signal processing circuit.

Abstract: A signal processing method for a MIMO system comprises the steps of: arranging a plurality of frequency domain MIMO data streams into a plurality of groups, wherein each group comprises at least a frequency domain MIMO data stream; partitioning sub-carriers of each of the plurality of frequency domain MIMO data streams into a plurality of sub-channels; performing phase rotation for the plurality of frequency domain MIMO data streams, wherein the phases of the sub-carriers in a sub-channel are rotated the same amount, and different phase rotations are performed on different groups of the plurality of frequency domain MIMO data streams; transforming the plurality of frequency domain MIMO data streams into a plurality of time domain MIMO data streams; and performing CSD for the plurality of time domain MIMO data streams if each group comprises more than one frequency domain MIMO data stream, wherein the amount of CSD is different for each time domain MIMO data stream in a group.

Abstract: A method sub-carrier grouping for a wireless communication system including a plurality of sub-carriers is disclosed. The method includes determining a coherent bandwidth of the plurality of sub-carriers, and dividing the plurality of sub-carriers into a plurality of sub-carrier groups according to the coherent bandwidth, wherein the size of each sub-carrier group is smaller than or equal to the coherent bandwidth.

Abstract: A method of generating preamble sequence is disclosed. A channel used by a wireless device may be divided into four sub-channels, and the method includes forming a preamble sequence of a first sub-channel, making three replicas of the preamble sequence of the first sub-channel, each replica with a phase rotation of a first angle, a second angle, and a third angle respectively, for forming each preamble sequence of a second sub-channel, a third sub-channel, and a fourth sub-channel, and arranging the preamble sequences of the first, the second, the third, and the fourth sub-channels to form a preamble sequence of the channel.

Abstract: A method of generating preamble sequence for a wireless communication system includes generating a frequency-domain preamble sequence related to a packet, transforming the frequency-domain preamble sequence into a first time-domain preamble sequence, performing a cyclic shift delaying process on the first time-domain preamble sequence for generating a second time-domain preamble sequence, and normalizing power of the first time-domain preamble sequence and the second time-domain preamble sequence for generating the first field of a preamble of the packet.