摘要:
A method and system provide multiple-access control and frequency band allocation, and transmission time sharing among multiple users in orthogonal frequency-division multiple-access (OFDMA) and time-division multiple-access (TDMA) networks. The method can be applied to uplinks and downlinks of multi-user, multi-carrier communication networks. Under a total transmission-power minimization constraint, the method can allocate carriers and transmission time to users optimally, and at the same time, can guarantee a data rate or equivalently a latency requirement of each user.
摘要:
A method and system provide multiple-access control and frequency band allocation, and transmission time sharing among multiple users in orthogonal frequency-division multiple-access (OFDMA) and time-division multiple-access (TDMA) networks. The method can be applied to uplinks and downlinks of multi-user, multi-carrier communication networks. Under a total transmission-power minimization constraint, the method can allocate carriers and transmission time to users optimally, and at the same time, can guarantee a data rate or equivalently a latency requirement of each user.
摘要:
A network includes a master and a set of slaves that communicate orthogonal frequency-division multiplexing (OFDM) and time division multiple access (TDMA) symbols on sub-carriers. A master broadcasts to the set of slaves using downlinks and all of the sub-carriers, a broadcast polling packet including data packets for each slave and sub-carrier assignments for the slaves. Each slave, in response to receiving the downlink polling packet, transmits simultaneously a response packet to the master using uplinks and the assigned sub-carriers. The master then transmits to the set of slave using the downlinks and all of the sub-carriers, a group acknowledgement packet, wherein the broadcast polling packet, the response packet, and the group acknowledgement packet comprise one superframe in one communication cycle, and wherein the broadcasting on the downlinks and the transmitting on the uplinks are disjoint in time.
摘要:
A network includes a master and a set of slaves that communicate orthogonal frequency-division multiplexing (OFDM) and time division multiple access (TDMA) symbols on sub-carriers. A master broadcasts to the set of slaves using downlinks and all of the sub-carriers, a broadcast polling packet including data packets for each slave and sub-carrier assignments for the slaves. Each slave, in response to receiving the downlink polling packet, transmits simultaneously a response packet to the master using uplinks and the assigned sub-carriers. The master then transmits to the set of slave using the downlinks and all of the sub-carriers, a group acknowledgement packet, wherein the broadcast polling packet, the response packet, and the group acknowledgement packet comprise one superframe in one communication cycle, and wherein the broadcasting on the downlinks and the transmitting on the uplinks are disjoint in time.
摘要:
The invention discloses a cycle power generation device, comprising a battery, a motor and a generator. The battery is a rechargeable battery and is connected with the motor through a power transmission line. The motor drives the generator to rotate, and the electricity returns to the motor through the power transmission line in series after producing electricity, thereby achieving the cycle power generation by driving the motor. The battery is provided for starting the motor at the initial stage, and the motor is driven by the electricity from the generator instead of the battery, after driving the generator to produce electricity by rotating the motor. The electricity produced by the generator is linearly transmitted to the motor, and the motor drives the generator to generate electricity, which is the cycle power generation.
摘要:
Methods, systems, and devices for wireless communication are described that support a low peak-to-average power ratio (PAPR) precoded reference signal design for multiple-input, multiple-output (MIMO) transmissions. A user equipment (UE) may identify multiple sets of symbols associated with different reference signal waveforms, where each reference signal waveform may be associated with a low PAPR. In some cases, different single-carrier reference signal waveforms may be mapped to subsets of frequency resources through frequency division multiplexing (FDM) for a transmission on a single antenna. However, the addition of single-carrier waveforms through FDM for a transmission via an antenna may result in an uplink transmission having a high PAPR (e.g., as compared to single-carrier waveforms). The UE may reduce the PAPR of the uplink transmission by multiplexing the reference signal waveforms in the time domain (e.g., using time division multiplexing (TDM)).
摘要:
A smart system includes a connector plug that fits into a bulb socket; a processor to control the smart system; and at least one of a receiver and a transmitter coupled to the processor for receiving or transmitting data.
摘要:
Techniques are provided for frequency spectrum sharing that allows secondary operators to access a frequency band of a primary operator without interfering with the primary operator's use of the band, while ensuring service continuity for devices of the secondary operators. For example, there is provided a method that may involve identifying an outage on a first channel of a plurality of channels of a spectrum, wherein each of the plurality of channels is allocated to one of a plurality of operators. The method may involve migrating all mobile stations in communication over the first channel of the plurality of channels to at least one other channel of the plurality of channels during the outage.
摘要:
Systems, methods, and devices are provided for an electronic display with thermally compensated pixels. Such an electronic display may have an array of pixels, at least some of which may be thermally compensated pixels that exhibit reduced thermal color shift over an operational temperature range. These thermally compensated pixels may have compensation electrodes that induce an electric field in the thermally compensated pixel that cause a reduction in color shift.
摘要:
A method and an apparatus for monitoring an electron beam condition of an SEM are provided. The SEM includes an electron gun and an electromagnetic lens system. The method includes acquiring quality parameters of an input electron beam, wherein the input electron beam is provided by the electron gun to the electromagnetic lens system, acquiring a current set of operation parameters of the electromagnetic lens system, calculating quality parameters of an output electron beam of the electromagnetic lens system, based on the quality parameters of the input electron beam and one or more operation parameters of the current set of operation parameters, and determining, based on the quality parameters of the output electron beam, whether calibration of the SEM is required.