48results about "Frequency diversity" patented technology

In order to maintain performance during wireless communication, a transmitting electronic device may concurrently and independently communicate redundant information to a receiving electronic device. In particular, information associated with a data stream may be communicated to the receiving electronic device using one or more channels by two radios using one or more wireless local area network communication protocols. The packets transmitted by the radios may preferentially include the same information. Moreover, the transmitting electronic device may attempt to maintain the redundant communication if a performance metric associated with the one or more channels degrades. For example, the transmitting electronic device may transfer communication to a different channel or may compress the information in the packets in the one or more channels if the throughput drops below a threshold value. Furthermore, the concurrent communication may allow the transmitting electronic device determine link quality without disrupting the communication of the information.

A wireless communication system configured for providing wireless communication is adapted to provide a first radio channel in a radio propagation channel and in a first frequency interval and to provide a second radio channel in the radio propagation channel and in a second frequency interval differing from the first frequency interval. The wireless communication system is to obtain first radio channel information indicating a behaviour of the first radio channel and to manage beamforming for the second radio channel based on the first radio channel information.

Transmission quality is improved in an environment in which direct waves dominate in a transmission method for transmitting a plurality of modulated signals from a plurality of antennas at the same time. All data symbols used in data transmission of a modulated signal are precoded by hopping between precoding matrices so that the precoding matrix used to precode each data symbol and the precoding matrices used to precode data symbols that are adjacent to the data symbol in the frequency domain and the time domain all differ. A modulated signal with such data symbols arranged therein is transmitted.

The application provides a frequency diversity and polarization diversity transmission system based on diversity antennas, comprising a diversity antenna subsystem, a radio frequency feeding network and a baseband processing unit, the diversity antenna subsystem comprises a first diversity antenna, a second diversity antenna and a metal floor, the first diversity antenna and the second diversity antenna are both at least dual-frequency antennas and are placed in space orthogonally, the radio frequency feeding network comprises a signal phase shifter, an equivalent phase shifter, a power divider and a signal amplifying device, and can realize frequency diversity and twice polarization diversity. The frequency diversity and polarization diversity transmission system based on diversity antennas provided by the application realizes the collaborative innovation of a radio frequency front end and a baseband processing unit, and constructs a complete radio frequency baseband architecture which can simultaneously and actively realize the collaborative processing of polarization diversity and frequency diversity.

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may communicate on a primary carrier using a first antenna port. The UE may communicate on a secondary carrier using a second antenna port. The UE may determine whether to switch the secondary carrier from the second antenna port to the first antenna port based on a channel condition associated with the second antenna port. The UE may switch the secondary carrier from the second antenna port to the first antenna port based on a decision to switch the secondary carrier from the second antenna port to the first antenna port. Numerous other aspects are provided.

A transmitting device (10) performing orthogonal frequency division multiplexing communication includes a subcarrier mapping unit (113) that replicates a subcarrier signal sequence and maps the replicated subcarrier signal sequences at equal subcarrier intervals, and a transmission phase rotation unit (114) that divides each subcarrier signal sequence mapped at the subcarrier intervals into two or more subsets and imparts phase rotation resulting in different time timing to each subset.

To divide an image into blocks, group the blocks into some subsets, and associate signs the blocks in the subsets with digital information to encode the blocks by using an entropy encoding module.SOLUTION: An encoding method includes initializing a state variable of an encoding module for a first block of an image, and generating a data sub-stream representing at least one of subsets of encoded blocks. When the current block is the first block in the subset, a symbol generation probability of the first block is determined on the basis of the symbol generation probability of encoded and decoded predetermined blocks in at least one another subset. When the current block is the last encoded block in the subset, while the block in the subset is encoded, entire digital information related to a symbol is written in the sub-stream representing the subset, and the initialized sub-step is implemented.SELECTED DRAWING: Figure 2B

An antenna array of frequency-independent phase shifters may be configured to provide band-specific beamforming over a plurality of operating bands by determining, based on a first frequency allocation on a first operating band with first angular directions, at least a second frequency allocation on a second operation band with a second angular directions, so that a first set of predefined requirements comprising at least beamforming requirements on frequency allocations and angular directions are met on all operating bands, determining beamforming weights, and configuring the antenna array to apply the beamforming weights.

An apparatus for transmitting a broadcast signal according to one embodiment of the present invention comprises: a first RF BICM unit for generating at least one first RF core layer BICM signal and at least one first RF enhanced layer BICM signal; a second RF BICM unit for generating at least one second RF core layer BICM signal; a layered division modulation unit for generating at least one layered division multiplexed signal by performing layered division multiplexing corresponding to at least a part of the at least one first RF core layer BICM signal and at least a part of the at least one first RF enhanced layer BICM signal; and a transmission signal generation unit for generating at least one first RF transmission signal corresponding to the at least one layered division multiplexed signal and at least one second RF transmission signal generated on the basis of at least a part of the at least one second RF core layer BICM signal.

A communication apparatus includes: storing means for storing information indicating a first base set including a first base sequence to an N-th base sequence; shifting means for generating a first shift sequence to an N-th shift sequence by determining a shift amount based on transmission data, and cyclic shifting an n-th base sequence (n being an integer from 1 to N) by the shift amount; holding means for holding timing information indicating transmission timings of sequences; and transmitting means for transmitting each shift sequence according to the timing information, wherein the first base sequence to the N-th base sequence satisfy a first condition of: a total across the first base sequence to the N-th base sequence of correlation values of autocorrelation is not 0 when a shift amount is 0, and a total across the first base sequence to the N-th base sequence of correlation values of autocorrelation is 0 when a shift amount is different from 0 used in data transmission.

The application discloses a frequency diversity array time domain beam control method based on dynamic frequency offset and belongs to the field of microwave and radio frequency electronic technologies. The method comprises the following steps: obtaining a transmission time window and a target angle corresponding to a target beam pointing direction in the transmission time window; in the duration of the transmission time window, based on the target angle, dynamically determining a frequency offset increment between each array element in the frequency diversity array, wherein the frequency offset increment is in inverse proportional relationship with the value of an equivalent time parameter; based on the frequency offset increment, controlling each array element of the frequency diversity array to transmit a signal of a corresponding frequency, so that the synthesized beam continuously points to the target beam pointing direction in the transmission time window. Through dynamic phase compensation, the application offsets the phase drift caused by time accumulation; meanwhile, while reducing the bandwidth requirement, the application physically eliminates beam distortion by using frequency symmetric distribution.

In a radio communication method non-contiguously using a frequency, notification information is reduced, while suppressing an effect on performance. In a communication apparatus which switches between a communication method contiguously using a frequency and a communication method non-contiguously using the frequency, sets a parameter corresponding to each communication method, and performs radio communication, the communication apparatus sets a same parameter to an entire frequency band in the communication method contiguously using the frequency, while dividing a frequency band into a plurality of frequency bands and setting a different parameter for each divided frequency band in the communication method non-contiguously using the frequency. The communication method contiguously using the frequency and the communication method non-contiguously using the frequency mutually have different PAPR (Peak to Average Power Ratio) characteristics.

The application discloses a sub-carrier space arrangement index method of MIMO-OFDM system. The method groups source bits of a transmitting end, and respectively carries out QAM modulation and index modulation. The bits after index modulation are mapped into a sub-carrier space arrangement matrix, multiplied with a constellation diagram after QAM modulation, and then subjected to space-time mapping to obtain data to be transmitted by sub-carriers of each transmitting antenna. Then, time domain signals to be transmitted by each antenna are generated through IDFT conversion. At a receiving end, the signals are demodulated through a corresponding mode to obtain a sub-carrier space arrangement matrix and a QAM symbol, and the source bit data is obtained through mapping of the sub-carrier space arrangement matrix and index bits, serial-parallel conversion. The method starts from utilization of space resources, can improve frequency spectrum utilization rate, realizes a certain degree of receiving diversity, and is superior to prior art in bit error rate and demodulation complexity, so that communication quality and frequency spectrum utilization rate reach a balance.

The technology of this disclosure relates to a signal modulating method, a signal demodulating method, a device, a storage medium, and a program product. In the signal modulating method according to a first aspect of this disclosure, a sending device modulates a bit sequence onto a plurality of subcarriers through binary phase shift keying (BPSK) constellation point mapping, dual carrier modulation (DCM), and a duplication (DUP) operation, where the plurality of subcarriers include a first group of subcarriers and a second group of subcarriers. Then, the sending device changes a phase of first data carried in the first group of subcarriers by 90 degrees or minus 90 degrees, and further generates a modulation signal based on the first data that is carried in the first group of subcarriers and whose phase has been changed and second data carried in the second group of subcarriers.

The present application discloses a beam training method, a device, a terminal device, and a network device. The beam training method of the present application includes a step of measuring at least two reference signals for beam training transmitted by an auxiliary device in at least two transmission modes and obtaining measurement information, the measurement information being for indicating an optimal transmission mode of the auxiliary device, the transmission mode of the auxiliary device being determined by a beam direction and a beam phase of the transmission signal of the auxiliary device, and a step of reporting the measurement information to the network device.

A wireless communication method and protocol for wireless RF transmission of data, e.g. audio data, with low latency. The method involves a fixed part (FP) serving as synchronization master, and one or more portable parts (PP) being synchronization slaves. The FP performs scanning between a set of supported channels within one limited frequency band, such as within an ISM band. Further, the FP performs collecting measures of RF interference level on at least a plurality of the supported channels in response to the scanning, preferably using own interference level measurement and by collecting RSSI data from the PP for the supported channels. In response to these measures of RF interference level, the FP executes a selection algorithm for selecting and re-selecting first and second different frequencies for respective first and second duplex RF bearers from the set of supported channels to select the channels with least RF interference. Finally, the FP transmits, in one frame of such as 1 ms to 3 ms length, the same data packet on both of said first and second duplex RF bearer frequencies to the PP. This provides a roboust and low latency wireless interface suitable for Human Interface Devices and audio devices, e.g. for gaming equipment.

An antenna array of frequency-independent phase shifters may be configured to provide band-specific beamforming over a plurality of operating bands by determining, based on a first frequency allocation on a first operating band with first angular directions, at least a second frequency allocation on a second operating band with a second angular directions, so that a first set of predefined requirements comprising at least beamforming requirements on frequency allocations and angular directions are met on all operating bands, determining beamforming weights, and configuring the antenna array to apply the beamforming weights.

There is provided a UE for performing communication, the UE comprising: at least one transceiver; at least one processor; and at least one computer memory operably connectable to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising: transmitting an uplink signal based on NR operating band n3; receiving a downlink signal based on the NR operating band n3.

Methods, systems, and devices for wireless communication are described. A device may transmit excitation signals to a backscatter device at different frequencies using multiple antenna ports. For example, the device may transmit an excitation signal to a backscatter device using a first antenna port and a second antenna port based on one or more parameters. The excitation signal may include a first frequency component at a first frequency and a second frequency component at a second frequency. The device may perform a frequency exchange or symbol hopping when sending an excitation signal to the backscatter device.

The invention discloses a frequency diversity array time domain beam control method based on dynamic frequency offset, and belongs to the technical field of microwave and radio frequency electronics. The method comprises the following steps: acquiring a transmitting time window and a target angle corresponding to the pointing of a target beam in the transmitting time window; within the duration of the emission time window, based on the target angle, dynamically determining a frequency deviation increment between array elements in a frequency diversity array, the frequency deviation increment being inversely proportional to a value of an equivalent time parameter; and based on the frequency offset increment, controlling each array element of the frequency diversity array to transmit a signal of a corresponding frequency, so that a synthetic beam continuously points to the target beam direction in the transmission time window. According to the invention, through dynamic phase compensation, phase drift caused by time accumulation is offset; and meanwhile, the bandwidth requirement is reduced, and beam distortion is physically eliminated by utilizing frequency symmetric distribution.

A replicated Physical Layer Convergence Protocol (PLCP) Protocol Data Unit (PPDU) transmission for a wireless device is described, the transmission having a reduced Peak to Average Power Ratio (PAPR). One example includes obtaining a first sub-PPDU from a PPDU including a data field having data content. A second sub-PPDU may also be obtained by copying the PPDU that includes data content of the PPDU. At least one of a phase rotation, a phase offset, or a phase ramp is applied to at least a portion of a second set of subcarriers of the broadband channel. A first sub-PPDU is transmitted on a first set of subcarriers of a broadband channel, and a second sub-PPDU is transmitted on a second set of subcarriers of the broadband channel.

The invention provides an antenna and communication equipment, relates to the technical field of communication, and aims to solve the problem of poor consistency of radio frequency transceiving channels. The antenna provided by the invention comprises a feed network, a correction circuit and a plurality of radiation sub-arrays, wherein each radiation sub-array comprises at least one radiation sub-array unit; the feed network is provided with a plurality of radio frequency receiving and transmitting channels, and the plurality of radio frequency receiving and transmitting channels are connected with the plurality of radiation sub-array units in a one-to-one correspondence manner; a first circuit in the correction circuit is used for realizing channel consistency correction among a plurality of radiation sub-array units in the radiation sub-array; and the second circuit is used for realizing channel consistency correction among the plurality of radiation sub-arrays, and finally realizing consistency correction of all channels. In the antenna provided by the invention, the channel consistency correction among the plurality of radiation sub-array units in the radiation sub-array is realized through the first circuit, the channel consistency correction among all the radiation sub-array units is realized through the second circuit, and the antenna has the advantages of simple circuit structure and relatively good channel correction consistency.

The present application discloses a signal transmission method, a signal receiving method, and a communication apparatus. The method includes a first device transmitting a first signal to a second device for a first frequency domain unit and transmitting a second signal for a second frequency domain unit. The first frequency domain unit includes a first frequency, and the second frequency unit includes a second frequency. The absolute value of the difference between the first frequency and the second frequency is associated with one or more of the following: a first bandwidth, a second bandwidth, or a third bandwidth. The first bandwidth is a bandwidth occupied by the first frequency domain unit in the frequency domain. The second bandwidth is a bandwidth occupied by the second frequency domain unit in the frequency domain. The third bandwidth is a bandwidth occupied by the third frequency domain unit in the frequency domain. The third frequency domain unit is used by the first device to transmit a third signal to a third device. The first signal, the second signal, and the third signal are in one operating band. In this way, interference can be suppressed without increasing the complexity of the radio frequency filters.

A system and method for use in a multidevice bidirectional communication system such as a wireless multichannel audio system (WMAS). The WMAS includes a base station and multiple wireless audio devices such as microphones, in ear monitors, etc. that can be used for live events, concerts, night clubs, churches, etc. The point to multipoint star topology system does not require a set of independent communication subsystems on both sides. The system includes two or more transceivers in the base station side but only a single transceiver in the devices which in combination with a novel protocol, provides the system with time, frequency and / or spatial diversity. This significantly reduces cost and form factor, while increasing the reliability and signal quality due to the extra redundancy and diversity in the system.

This application discloses a beam training method and apparatus, a terminal device, and a network device. The beam training method in this application includes: measuring at least two reference signals used for beam training and forwarded by an auxiliary device in at least two forwarding modes to obtain measurement information, where the measurement information is used for indicating an optimal forwarding mode of the auxiliary device, and a forwarding mode of the auxiliary device is determined by using a beam direction of a forwarded signal of the auxiliary device and a beam phase of the forwarded signal of the auxiliary device; and reporting the measurement information to a network device.

This specification presents a technical feature for increasing a transmission range of a wireless LAN signal. The wireless LAN signal of this specification, e.g., a transmission physical protocol data unit (PPDU), can be configured based on a replication transmission mode. The transmission PPDU of this specification can include replicated data units in frequency. The replicated data units in frequency can be configured based on a total bandwidth of the transmission PPDU. The transmission PPDU of this specification presents various training fields for the replicated data units.

To improve communication quality and reliability in a wireless transmission path.SOLUTION: A receiving device includes a receiving portion that receives radio waves carrying the same data at a plurality of different frequencies as a plurality of signals, a combining portion that combines the plurality of signals, and a demodulating portion that demodulates the combined signal.SELECTED DRAWING: Figure 1

To provide an image decoding method, a system, and a computer readable medium for optimizing operation of a coder / decoder.SOLUTION: A coding unit UC1 is adapted for sequentially coding rows of odd rank SE1, SE3, and SE5 and delivering a sub-stream F2n+1 decomposed into two parts F1 and F3 obtained subsequent to the coding respectively of rows SE1 and SE3. A coding unit UC2 is adapted for sequentially coding rows of even rank SE2, SE4, and SE6 and delivering a sub-stream F2n decomposed into two parts F2 and F4 obtained subsequent to the coding respectively of rows SE2 and SE4. Therefore, a coder CO is adapted for transmitting to a decoder DO a stream F which contains the juxtaposition of the two sub-streams F2n+1 and F2n and therefore an ordering of the sub-streams F1, F3, F2, F4.SELECTED DRAWING: Figure 7B