A digital broadcast communication system includes a transceiver configured to receive a preamble having one of at least four preamble patterns characterized by a bit pattern and a length, produce the received preamble to each of at least four preamble correlator circuits, and at each correlator circuit, compare the received preamble to a reference code pattern. If a specified level of correlation exists between the received preamble and the reference code, produce an indication that the comparison was favorable. In one embodiment, the transceiver includes 16 correlator circuits and further includes 128 preamble reference codes for detecting preambles that have control, synchronization or data content.

Described herein are systems configured for inter-band carrier aggregation. Systems include a multiplexing circuit having a switching network and diplexers wherein the switching network is configured to share inductors between multiple paths of the multiplexing circuit. The filters can be designed so that when operated simultaneously (e.g., during multi-band operation) the same inductance can be used allowing the switching network to switch in a particular inductance into the path. The described systems can include an inductance that is coupled to an output port so that when operating in single-band mode, the different paths share the same inductance. Relative to other solutions, the described systems can improve performance (e.g., reduce insertion loss), reduce the number of components in the associated module, reduce manufacturing costs, and the like.

The present disclosure relates to a communication technique of fusing a 5G communication system for supporting higher data transmission rate beyond a 4G system with an IoT technology and a system thereof. The system may be used for an intelligent service (for example, smart home, smart building, smart city, smart car or connected car, health care, digital education, retail business, security and safety related service, or the like) based on the 5G communication technology and the IoT related technology. The present disclosure discloses a method and apparatus for inserting an index into a code block as a unit in which a channel code is executed and transmitting the same.

Positioning for user equipments (UEs) in a wireless network is supported by restricting position reference signal (PRS) configuration parameters for a Transmission Reception Point (TRP) based on PRS configuration used by co-located TRPs. The PRS configuration parameters for the TRP may be restricted by restricting orthogonality of the PRS resources with respect to PRS resources from co-located TRPs to only code division multiplexing, and other types of orthogonality such as time division multiplexing and frequency divisional multiplexing are not permitted for co-located TRPs. The PRS configuration parameters for the TRP may be restricted to the same muting sequence type, e.g., inter-instance and/or intra-instance muting, as used by co-located TRPs. The PRS configuration parameters, e.g., related to orthogonality and/or muting, are not restricted with respect to non-co-located TRPs. The restrictions on the PRS configuration parameters for a TRP may be determined by a central authority, such as a location server.

An orthogonal frequency division multiplexing (OFDM)-code division multiple access (CDMA) system is disclosed. The system includes a transmitter and a receiver. At the transmitter, a spreading and subcarrier mapping unit spreads an input data symbol with a complex quadratic sequence code to generate a plurality of chips and maps each chip to one of a plurality of subcarriers. An inverse discrete Fourier transform is performed on the chips mapped to the subcarriers and a cyclic prefix (CP) is inserted to an OFDM frame. A parallel-to-serial converter converts the time-domain data into a serial data stream for transmission. At the receiver, a serial-to-parallel converter converts received data into multiple received data streams and the CP is removed from the received data. A discrete Fourier transform is performed on the received data streams and equalization is performed. A despreader despreads an output of the equalizer to recover the transmitted data.

Methods, systems, and devices for wireless communications are described. In a wireless communications system, a network entity may determine to transmit first downlink control information (DCI) associated with a demodulation reference signal (DMRS) allocated to multiple resource elements of a control channel. The network entity may select a CDM group used for encoding second (e.g., future) DCI, for example, based on identifying a phase change pattern associated with the CDM group. A user equipment (UE) may monitor for the DMRS during a first time interval, and determine the CDM group for encoding the second DCI, for example using blind decoding. In some cases, the UE may receive the second DCI via the control channel based on the CDM group determined in association with the second DCI.

Disclosed in the present application are a method and apparatus for indicating TCI, a base station, and a storage medium. The method includes: when TCI in DCI configured by a base station for a UE corresponds to at least two TCI states, indicating a correspondence between a CDM group and a TCI state by mean of the DCI, and the CDM group is a CDM group to which a DMRS port allocated by the base station for the UE belongs.

A satellite communications system for communicating at a first frequency slot with first and second pairs of satellite transponders in linear polarization format. The system comprises a first terminal, a second terminal and a station. The first terminal receives at least one first input signal and concurrently radiates a first output signal at the first frequency slot to the first and second pairs of satellite transponders via a first beam and a second beam, respectively, in right-hand circularly polarized format. The second terminal receives at least one second input signal and concurrently radiates a second output signal at the first frequency slot to the first and second pairs of satellite transponders via a third beam and a fourth beam, respectively, in left-hand circularly polarized format. The station receives four satellite signals from the first and second pairs of transponders and recovers the at least one first input signal and the at least one second input signal using wavefront multiplexing technique.

An orthogonal frequency division multiplexing (OFDM)-code division multiple access (CDMA) system is disclosed. The system includes a transmitter and a receiver. At the transmitter, a spreading and subcarrier mapping unit spreads an input data symbol with a complex quadratic sequence code to generate a plurality of chips and maps each chip to one of a plurality of subcarriers. An inverse discrete Fourier transform is performed on the chips mapped to the subcarriers and a cyclic prefix (CP) is inserted to an OFDM frame. A parallel-to-serial converter converts the time-domain data into a serial data stream for transmission. At the receiver, a serial-to-parallel converter converts received data into multiple received data streams and the CP is removed from the received data. A discrete Fourier transform is performed on the received data streams and equalization is performed. A despreader despreads an output of the equalizer to recover the transmitted data.

The invention is about a method and apparatus for grouping multiple satellite transponders with both (LP) polarization formats in different frequencies through Wave-Front (WF) Multiplexing (muxing) techniques for ground terminals with incompatible (CP) polarization formats. As a result of this invention, linear polarized (LP) transponders can be accessed and efficiently utilized by circularly polarized (CP) ground terminals and vice versa. This invention consists of conventional ground terminals, a unique organization of space assets, and a unique polarization alignment processor. The applications of wavefront multiplexing techniques to satellite communications offer many potential advantages, including improved flexibility and utility efficiency of existing space assets. Our proposed Polarization Utility Waveforms is an entirely new concept in VSAT and Earth Station Antenna diversity. The implementation enables antennas to switch between different polarization formats at the press of a button, and provides teleport operators with greater flexibility in how they manage their assets.