10 results about "Transmission diversity" patented technology

A wireless transmit receive unit (WTRU) and methods for mitigating narrowband interference on sidelink communications are disclosed. A method performed by the WTRU may include: receiving sidelink control information (SCI) including information indicating at least one alternative transmit resource pool (TxRP) different from the TxRP of the received SCI, and reserving resources on the at least one alternative TxRP according to the information indicated in the SCI. the method may include receiving at least one of a PSCCH transmission or a PSSCH transmission, via the reserved resources, for a Hybrid Automatic Repeat Request HARQ transmission or a HARQ retransmission, and transmitting a PSFCH signal for HARQ feedback on the at least one alternative TxRP or the TxRP of the received SCI.

A wireless transmit receive unit (WTRU) and methods are disclosed for mitigating narrowband interference on sidelink communications. The method may include: receiving, at a WTRU, SCI, the SCI including information indicating at least one alternative TxRP different from the TxRP used for SCI is transmission, reserving, at the WTRU, resources on the at least one alternative TxRP according to the information indicated by the received SCI; and transmitting, by the WRTU, at least one of: a PSCCH, and a PSSCH, alone or in combination, via the reserved resources for a Hybrid Automatic Repeat Request HARQ transmission or HARQ retransmission, or a PSFCH for HARQ feedback, on the at least one alternative TxRP. The method may also include determining a rank of PSSCH transmission based on a CSI-RS, determining to apply PSSCH layer aggregation according to a channel quality when the determined rank is greater than 1.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a configuration for a first physical channel associated with analog channel state information (CSI), wherein the configuration for the first physical channel includes a configuration for applying a rate matching technique or a transmission diversity technique to the first physical channel. The UE may receive a configuration for a second physical channel associated with digital CSI. The UE may transmit, via the first physical channel, an analog component of a CSI report in accordance with the configuration for the first physical channel associated with the analog CSI. The UE may transmit, via the second physical channel, a digital component of the CSI report in accordance with the configuration for the second physical channel associated with the digital CSI. Numerous other aspects are described.

Example embodiments relate to techniques for implementing radar waveform diversity. A technique may involve a radar unit transmitting radar signals into an environment of a vehicle based on a code sequence that indicates a ramp direction and a phase shift for each pulse in a pulse used by the radar unit and receiving radar reflections from the environment. In some instances, the radar unit may leverage antennas in a multiple input multiple output (MIMO) arrangement to further add diversity to transmissions according to spatial code in the code sequence. The technique can further involve using a demodulator to map the environment based on the radar reflections and controlling the vehicle based on the mapping. In some instances, the code sequence is received from a system that is wirelessly providing orthogonal code sequences to multiple emitters.

A method, apparatus and computer program product are provided for conveying information regarding the antenna configuration and / or the transmission diversity scheme to a recipient, such as a mobile device. In particular, information regarding the antenna configuration and / or the transmission diversity scheme can be conveyed by appropriately mapping a physical broadcast channel within a sub-frame so as to include reference signals indicative of different antenna configurations or transmission diversity schemes. Alternatively, masking, such as cyclic redundancy check masking, can be used to provide information regarding the antenna configuration and / or the transmission diversity scheme.

A method of transmission of a set of I bits of information stream is described, in which said method comprises: selecting, from a pool of at least 2I matrices, a matrix to uniquely represent the set of I bits of information stream, wherein each matrix of the pool is a set of M vectors, and each vector is of length D; and transmitting a resource block across M transmit antennas, wherein respective vectors of the M vectors are transmitted on respective transmit antennas of the M transmit antennas. The transmitting comprises mapping respective entries of the respective vectors to respective resource elements of the resource block.

The application discloses a time synchronization method, device and equipment of a dual-antenna transmission diversity, and relates to the field of dual-antenna transmission diversity. The method comprises the following steps: at a sending end, performing frequency domain CDD processing on one of two space-time streams, and adding a synchronization header to the two space-time streams, wherein the synchronization header comprises a long preamble formed by a 512-point M sequence, and the number of delay samples of the long preamble CDD processing is 256; at a receiving end, using a sliding search window with a value of 768 to obtain the time of three correlation peaks generated by the long preamble as a time synchronization point for time synchronization. The application can ensure that the second expected correct peak value is the highest in any complex multipath scenario, thereby avoiding synchronization errors in the complex multipath scenario and avoiding demodulation failure.

The invention discloses a DVB-S2 high-order modulation satellite channel transmission simulation method and a DVB-S2 high-order modulation satellite channel transmission simulation system based on GNU Radio. According to the method, on the basis of a GNU Radio platform, a high-order modulation transmission link conforming to the DVB-S2 standard is constructed, modulation and demodulation of 16 APSK and 32 APSK are achieved, and the spectrum efficiency of a system is remarkably improved; through deep integration of Loo and Corazza satellite channel models, multipath fading and shadow effects of rural and urban environments are accurately simulated, and simulation authenticity is enhanced. According to the system, the transmission diversity technology is adopted, and the transmission robustness under a fading channel is improved through a double-transmission-branch architecture. End-to-end transmission verification of a high-definition video stream is realized by means of a HackRF software radio hardware platform, a TR101290 standard analysis module is integrated to carry out packet error rate analysis, and the transmission performance of the system is objectively quantified. According to the system, convenient parameter configuration and real-time monitoring are achieved through a QT graphical interface, and the problems that in traditional satellite communication simulation, channel models are not matched, the system flexibility is poor, and transmission reliability and stability are low under deep fading are effectively solved.

In a system for establishing connectivity in a HF ALE cellular network, stations are organized to sound each channel, synchronized to every other station in the network. All stations make identical sounding transmissions using a single address, synchronized such that the differential timing within the coverage area remains within the mobile radios' delay spread capability. Synchronized soundings allow the mobile radio to consistently connect to the best available channel. The stations may be synchronized via a central control function. Alternatively, the stations may perform soundings based on a predetermined schedule. Where the propagation time to the mobile radio is known, or determinable within some threshold, the stations may apply a delay to the sounding transmissions to ensure that the sounding transmissions from each of the stations reaches the mobile radio at the same time within some acceptable margin.