11 results about "Cyclic delay diversity" patented technology

A communication device, method, and computer program product optimize cyclic delay diversity (CDD) or linear delay diversity (LDD) for effective transmit diversity that increases transmit power by first and second transmit chains of the communication device. A controller of the communication device sequentially configures the first transmit chain to transmit an uplink signal and the second transmit chain to transmit the uplink signal with a different phase shift or time delay value. While sequentially transmitting, the controller monitors a measure of uplink signal quality at a network node for each sequentially changed phase shift or time delay values. The controller determines and uses an optimum value for the phase shift or time delay value that results in an optimum uplink signal quality over the evaluated sequence of different phase shift or time delay values.

The invention provides a cyclic delay diversity indication method, communication equipment and a storage medium. The cyclic delay diversity indication method applied to a first communication node comprises the following steps: receiving a node capability reported by a second communication node; and sending a first signaling to a second communication node based on the node capability and the current scene, wherein the first signaling is used for indicating the state of a cyclic delay diversity function.

The disclosure relates to a fifth generation (5G) or sixth generation (6G) communication system for supporting a higher data transmission rate. A method performed by a radio unit (RU) in a wireless communication system is provided. The method includes performing an inverse fast Fourier transform (IFFT) shift for frequency domain (FD) downlink (DL) symbol data, rearranging, in reverse order, IFFT points of the FD DL symbol data for which the IFFT shift has been performed, performing IFFT based on FD DL symbol data units of multiple antenna paths in order to convert the FD DL symbol data, for which the IFFT shift and the rearrangement have been performed, into time domain (TD) DL symbol data, applying cyclic delay diversity (CDD) to the TD DL symbol data, adding a cyclic prefix (CP) to the CDD-applied TD DL symbol data, and transmitting a signal generated based on the TD DL symbol data for which the CDD application and the CP addition have been performed.

Methods, systems, and devices for wireless communications are described. A network entity may indicate a range of values for a cyclic delay diversity (CDD) parameter associated with a channel to a UE. The UE may select a CDD value from the range of values based on one or more measurements, a configuration, or both, associated with the channel. The network entity may apply a cyclic to the channel according to a CDD value from the range of values, and may transmit, according to the applied cyclic delay, signaling to the UE via the channel. In some cases, the UE may receive the second control signaling according to the CDD value selected by the UE. The network entity may indicate the range of values via one or more techniques, and the range of values may be associated with a set of channel conditions, control resources, or both.

Various aspects of the present disclosure generally relate to wireless communication. Various aspects relate more specifically to the indication of a diversity scheme. Some aspects relate to indicating, by a network node and / or a user equipment (UE), whether small delay cyclic delay diversity (SD-CDD) is to be applied to various uplink transmissions to account for the transparency of SD-CDD. In some aspects, the network node may transmit one or more indications to enable and / or disable SD-CDD for some types of uplink communications. In some other aspects, the UE may transmit one or more indications to enable and / or disable SD-CDD for some types of uplink communications. In some aspects, the one or more indications communicated by the network node and / or the UE may define a specific value of the SD-CDD.

The invention belongs to the technical field of wireless communication, and particularly relates to an MIMO backscatter communication system based on a cyclic delay diversity technology. The system comprises a radio frequency source with a # imgabs 0 # antenna, a receiver with a # imgabs 1 # antenna and a reflection device with a # imgabs 2 # antenna, the receiver receives a direct link signal from the radio frequency source and a reflection link signal from the reflection device at the same time, the direct link signal is set to be known, and for the reflection link signal, the direct link signal is set to be known. A radio frequency source is defined to send sine carrier signals to reflection equipment through a beam forming vector # imgabs3 #, and the reflection equipment adopts a single-carrier cyclic prefix transmission scheme and applies a cyclic delay diversity technology to carry out signal reflection.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a first control signal that indicates a set of delay values corresponding to a set of antenna ports. The UE may receive a first reference signal that has a first delay profile. The first reference signal may be a multi-port reference signal or associated with the multi-port reference signal. The UE may determine a second delay profile for a demodulation reference signal (DMRS) based on the first delay profile of the first reference signal, the set of delay values, and an antenna port mapping between the multi-port reference signal and a set of DMRS. The UE may perform a channel estimation on the DMRS based on the set of delay values and the second delay profile.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication of a sounding reference signal (SRS) resource set to be used to signal a virtual port used for a physical uplink shared channel (PUSCH) communication, wherein the virtual port is a combination of at least two non-coherent or partially-coherent antenna ports of the UE using precoding and cyclic delay diversity; and transmit an SRS for the at least two non-coherent or partially-coherent antenna ports using one or more resources of the SRS resource set. Numerous other aspects are provided.

The invention relates to a multi-low-orbit satellite cooperative communication method based on spectrum sensing assistance, which comprises the following steps: in a multi-low-orbit satellite cooperative system, a satellite with a relatively low relative orbit height senses a satellite with a relatively high relative orbit height by applying a spectrum sensing technology, and satellite-ground communication is carried out based on spectrum sensing assistance. The method specifically comprises the following steps: embedding signal cyclic delay characteristics at a sending end by adopting a cyclic delay diversity technology, and performing corresponding processing at a receiving end. According to the invention, through real-time efficient detection and utilization of the spectrum hole, the satellite-ground communication link quality and the transmission performance are effectively improved.

Aspects relate to mechanisms for a wireless communication device to select between a cyclic delay diversity mode and an antenna switching diversity mode for signal transmission based on at least one parameter associated with a communication over a wireless channel. The parameter(s) can include a channel estimation parameter associated with the wireless channel, a communication parameter associated with at least one communication over the wireless channel, or a combination thereof.

Methods, systems, and devices are described for wireless communication. A user equipment (UE) can be associated with a first delay value for a small delay cyclic delay diversity (CDD) scheme for a broadcast channel. In some examples, the first delay value can be selected from a set of candidate delay values based on a frequency band associated with the broadcast channel. The UE can perform a channel estimation for the broadcast channel in accordance with one or more delay spread values associated with a multipath profile of the broadcast channel, where the one or more delay spread values are based at least in part on the first delay value associated with the small delay CDD scheme. The UE can receive a message via the broadcast channel based at least in part on performing the channel estimation.