13 results about "Frequency division duplexing" patented technology

The mobile terminal provided in this application includes a first antenna system, a second antenna system, a first radiator, and a second radiator. The tuning circuit of the first antenna system is coupled to the first radiator, and the tuning circuit of the second antenna system is coupled to the second radiator. When the second antenna system is in a transmit or receive time slot, by matching the tuning states of the tuning circuits of the first and second antenna systems, the first and second radiators can jointly excite and generate signals in the transmit or receive frequency bands of the second antenna system. Therefore, the antenna system design of the mobile terminal provided in this application utilizes the mutual assistance between the two antenna systems to improve the performance of the antenna system that simultaneously supports frequency division duplexing and time division duplexing, which is beneficial for enhancing the communication performance of the mobile terminal.

This invention discloses a bidirectional continuous-variable quantum key distribution method and system based on frequency division duplexing in a single-transceiver ring network. The method is based on a monolithically integrated silicon photonics transceiver chip. By pre-setting optical carrier frequency offsets for the forward and reverse links, it isolates the quantum signal from Rayleigh backscattering noise in the fiber in the frequency domain. The transmitting end generates a broadband waveform containing quantum signals and pilot signals, which is transmitted bidirectionally through a single optical fiber. The receiving end uses a laser source from the same chip as the local oscillator for coherent heterodyne detection. A digital signal processing module performs orthogonalization correction, phase recovery, and matched filtering to suppress noise and extract the quantum signal to generate a secure key. This invention solves the problems of inflexible networking, low fiber utilization, and severe scattering noise interference in bidirectional transmission over a single fiber caused by the separation of the transmitting and receiving ends in integrated continuous-variable quantum key distribution systems. It provides a low-cost and highly flexible solution for metropolitan quantum ring networks.

Methods and systems for fast sounding reference symbol (SRS) antenna port switching for FDD. A mobile device can include a baseband processor and a front end including a transmit power amplifier, a first transmit path, and a second transmit path. The front end can be configurable in a first mode to transmit via the first transmit path within a transmit band of a frequency division duplex band. The front end can be further configurable in a second mode to transmit via the second transmit path within a receive band of the frequency division duplex band.

The application discloses a channel information compression feedback method using frequency division duplex channel implicit reciprocity. For the frequency division duplex channel information data with implicit reciprocity, the application firstly converts the spatial frequency domain channel matrix to the angle delay domain and performs clipping, and then splits and splices the real part and the imaginary part of the channel matrix into two real number matrices; three encoder networks are used for decoupling characterization learning of the downlink channel, and the downlink channel unique information, the uplink and downlink channel common information and the virtual uplink and downlink channel common information are extracted respectively; the decoder network recovers the original channel information by using the downlink channel unique information and the uplink and downlink channel common information during training, and recovers the original channel information by using the downlink channel unique information and the virtual uplink and downlink channel common information during testing; in the application, the user only needs to feed back the downlink channel unique information, the channel feedback load is effectively reduced, the channel information recovery performance is improved, and the application has a significant performance advantage.

Methods, systems, and a non-transitory computer-readable medium for providing advanced scheduling for downlink frequency division duplex (FDD) resources when sounding reference signal (SRS) transmitter switching is in progress are provided. Initially, the node receives an indication that the user equipment (UE) is sharing at least one antenna between FDD and time division duplex (TDD). The node determines the SRS periodicity for the UE. Based on the SRS periodicity, the node provides advance scheduling for downlink FDD resources when SRS transmitter switching is in progress for an FDD receive slot of the at least one antenna. For example, the node may provide downlink FDD resources to other UEs. Additionally or alternatively, the node may blank the corresponding FDD receive slots of the at least one antenna.

Methods, systems, and devices for wireless communications are described. Techniques described herein may enable a user equipment (UE) and a network entity communicating via a frequency division duplexing (FDD) configuration to implement reciprocity-based learning techniques to perform an estimation of a downlink channel based on measurements of the uplink channel, and vice versa. For example, the network entity may perform measurements of one or more uplink reference signals and may estimate a quantity of clusters and spatial characteristics associated with the uplink reference signals. The UE may perform measurements of one or more downlink reference signals and may estimate a gain and phase shift associated with the downlink reference signals. The UE may feedback the gain and phase shift to the network entity with varying periodicities, and the network entity may estimate the downlink channel based on the gain, phase shift, and spatial characteristics.

A radio-frequency module includes a module substrate having first and second major surfaces, a transmit filter disposed at the module substrate, a duplexer that is disposed at the module substrate and that includes a transmit filter and a receive filter, an antenna switch to selectively couple the transmit filter or the duplexer, and a switch to selectively couple the transmit filter or the transmit filter. The transmit filter has a pass band that includes an uplink operating band of a first band for frequency division duplex. The transmit filter has a pass band that includes the uplink operating band of the first band. The receive filter has a pass band that includes a downlink operating band of the first band. The transmit filter and the receive filter are stacked together and positioned beside the first major surface.

The application discloses a channel state information feedback method based on a multi-scale physical perception puzzle mechanism and applied to a frequency division duplex large-scale MIMO system. A two-dimensional discrete Fourier transform is used to convert a space-frequency domain channel matrix into an angle-delay domain sparse matrix and complete preprocessing; a PAM-Net network containing a main branch reconstruction branch and a self-supervised auxiliary branch is constructed, a multi-scale physical perception puzzle mechanism and a physical guided anisotropic dynamic penalty strategy are introduced; a joint loss function is used for end-to-end offline training, and after training, the auxiliary branch is decoupled and stripped, and only the main branch is reserved to perform online compression and reconstruction. The application has the beneficial effects that: under the premise of not increasing the online inference complexity, the multi-scale physical feature perception ability of the channel and the CSI reconstruction accuracy are significantly improved, the feedback overhead is effectively reduced, and the application is suitable for a low-latency and high-reliable communication scene of a 6G super large-scale antenna array.

This disclosure provides a semantic data transmission method and related equipment based on frequency division duplex (FDM). The method includes: a base station modulating first user data corresponding to semantic data to obtain a first modulation sequence; the base station determining a first target combination method of the first modulation sequence based on the semantic type of the semantic data; the base station performing time-frequency resource mapping processing on the first modulation sequence based on the first target combination method to obtain a first time-frequency signal, and transmitting the first time-frequency signal to a user terminal via a downlink; the user terminal modulating second user data corresponding to the semantic data to obtain a second modulation sequence; the user terminal determining a second target combination method of the second modulation sequence based on the semantic type of the semantic domain information; the user terminal performing time-frequency resource mapping processing on the second modulation sequence based on the second target combination method to obtain a second time-frequency signal, and transmitting the second time-frequency signal to the base station via an uplink.

A self-adaptation method for optimizing multiple communication modules coexisting in frequency-division duplexing is provided. The method is operated in a communication system having at least two communication modules. Communication data generated by the communication modules is obtained when the communication system is operated under a time-division duplexing mode. The communication data is used to establish a standard comparison value for a frequency-division duplexing mode. The communication system then enters a parameter-adjustment phase, and radio-frequency parameters for the communication modules can be obtained. Thus, based on the standard comparison value, key performance indicator check is periodically performed for assessing whether to start or to stop a frequency-divisional duplexing training process according to one or more reference indicators so as to determine whether the radio-frequency parameters need to be adjusted. A set of radio-frequency parameters suitably operating the communication system under the frequency-division duplexing mode are finally obtained.

Various aspects of the present disclosure relate to channel state information reporting for multiple transmit / receive points and frequency division duplex reciprocity. One apparatus includes at least one memory and at least one processor that is configured to a channel state information (“CSI”) reporting configuration, the CSI reporting configuration comprising an indicator of multi-point transmission, and a configuration comprising at least two groups of channel measurement resources (“CMRs”). The at least one processor determines at least one CSI report based on the at least two groups of CMRs, the at least one CSI report mapped to a transmission hypothesis corresponding to one of a single-point transmission and a multi-point transmission. The at least one processor transmits the at least one CSI report to the mobile wireless communication network, the at least one CSI report ordered according to a predefined priority.

Methods, systems, and devices for wireless communications are described. Techniques described herein may enable a user equipment (UE) and a network entity communicating via a frequency division duplexing (FDD) configuration to implement reciprocity-based learning techniques to perform an estimation of a downlink channel based on measurements of the uplink channel, and vice versa. For example, the network entity may perform measurements of one or more uplink reference signals and may estimate a quantity of clusters and spatial characteristics associated with the uplink reference signals. The UE may perform measurements of one or more downlink reference signals and may estimate a gain and phase shift associated with the downlink reference signals. The UE may feedback the gain and phase shift to the network entity with varying periodicities, and the network entity may estimate the downlink channel based on the gain, phase shift, and spatial characteristics.

接入点可以包括处理设备。该处理设备可以在媒体访问控制（MAC）层确定用于第一组正交频分双工复用（OFDM）符号的第一调制和编码方案（MCS）。处理设备可以在MAC层确定用于第二组OFDM符号的第二MCS。处理设备可以在MAC层生成包括第一MCS和第二MCS的一个或多个聚合MAC协议数据单元（A‑MPDU）。处理设备可以从MAC层向物理层（PHY）发送一个或多个A‑MPDU，以生成包括第一MCS和第二MCS的PHY服务数据单元（PSDU）。