A broadcast signal receiver includes a tuner for tuning a broadcast signal, a reference signal detector for detecting pilots from the tuned broadcast signal, a de-framer for de-framing a signal frame of the broadcast signal and deriving service data based on a number of carriers of the signal frame, and a decoder for performing error correction process on the derived service data.

The disclosure provides a method and a device in a User Equipment (UE) and a base station for wireless communication. The UE first receives a first radio signal and a second radio signal, and then transmits a third radio signal. The first radio signal is used for determining a first signature sequence, and a receiving timing of the second radio signal is used for determining a transmitting timing of the third radio signal. The first signature sequence is used for generating the third radio signal. The first radio signal and the second radio signal are associated with a first synchronization sequence and a second synchronization sequence respectively, and the first synchronization sequence is different from the second synchronization sequence. According to the disclosure, through the designs of the first radio signal and the second radio signal, thereby improving system performances and transmission efficiency.

A radio transmission device includes: a known signal generating unit that generates a first known signal and a second known signal mapped in such a manner that subcarriers for transmitting a first signal not being 0 do not overlap with each other in symbols of one time band; an IDFT unit that converts the first known signal and the second known signal from a frequency domain signal into a time domain signal; a GI inserting unit that inserts a guard interval into the first known signal and the second known signal converted into time domain signals; a transmission antenna that transmits the first known signal in which the guard interval is inserted; and a transmission antenna that transmits the second known signal in which the guard interval is inserted.

Disclosed is a data transmission method in a mobile communication system. The data transmission method through a code sequence in a mobile communication system includes grouping input data streams into a plurality of blocks consisting of at least one bit so as to map each block to a corresponding signature sequence, multiplying a signature sequence stream, to which the plurality of blocks are mapped, by a specific code sequence, and transmitting the signature sequence stream multiplied by the specific code sequence to a receiver.

Examples synchronization signal configuration methods and apparatus are described. One example method is applied to a relay network including a first node and a second node, and the first node is a parent node of the second node. The example method includes sending synchronization signal configuration information by the first node to the second node, where the synchronization signal configuration information is used to indicate M first synchronization signal time-frequency positions and N second synchronization signal time-frequency positions in a candidate synchronization signal time-frequency position set. The first synchronization signal time-frequency position is used by the second node to send a first synchronization signal, the second synchronization signal time-frequency position is used by the second node to receive or detect a second synchronization signal, the candidate synchronization signal time-frequency position set includes W synchronization signal time-frequency positions, and W≥(M+N).

Data acquisition in a chirp spread spectrum (CSS) signal may use a data alignment indicator of a single down chirp signal or single upchirp signal. A receiver may receive part or all of a preamble comprising a sequence of training chirps for symbol alignment followed by a single opposite chirp for data alignment. Training chirps may be processed through a fast-Fourier transform (FFT), and the values from the FFT may be accumulated. The accumulated values may exceed a threshold for detection. The receiver may align, based on the received chirps of the preamble and exceeding the threshold, its symbol reception. Using this symbol alignment, the receiver may await a single opposite chirp after the sequence of training chirps. The single opposite chirp may indicate data alignment. Upon receipt of the opposite chirp, the receiver may start data acquisition based on chirps following the single opposite chirp.

This application discloses a synchronization signal sending method and a related device. The method includes: generating, a first synchronization signal sequence and a second synchronization signal sequence, where the first synchronization signal sequence is a sequence obtained based on a first m-sequence, the second synchronization signal sequence is a sequence obtained based on a Gold sequence, the Gold sequence is generated based on a second m-sequence and a third m-sequence, and a generator polynomial of the first m-sequence is the same as a generator polynomial of the second m-sequence; mapping, the first synchronization signal sequence onto M subcarriers in a first time unit to obtain a first synchronization signal, and mapping the second synchronization signal sequence onto M subcarriers in a second time unit to obtain a second synchronization signal, where M and N are positive integers greater than 1.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may identify that the UE is configured to use a two-step random access channel (RACH) procedure. The two-step RACH procedure may include an uplink request message and a downlink response. The UE may transmit the uplink request message as part of the two-step RACH procedure, and the uplink request message may include a preamble portion that is one of a set of predefined sequences and a payload portion that includes a physical uplink shared channel waveform. The UE may receive the downlink response as part of the two-step RACH procedure and in response to the uplink request message.

This disclosure provides systems, methods, and apparatus, including computer programs encoded on computer storage media, for group reference signal triggering for contention-based systems. The described techniques may enable a network node to trigger a group of one or more user equipments (UEs) to transmit a reference signal to the network node. The network node may transmit a group common control channel indicating timing information or configuration information corresponding to a set of resources for the transmission of the reference signal. The one or more UEs may transmit the reference signal according to the timing information or configuration information.

A chirp spread spectrum (CSS) receiver may reject, based on a data alignment chirp that includes an identifier that is a mismatch to a preconfigured identifier, a message early and before fully receiving/decoding the message. A receiver may receive a sequence of training chirps for symbol alignment followed by a single opposite chirp for data alignment. Training chirps may be processed through a fast-Fourier transform (FFT) and the resulting values accumulated. The receiver may align, based on the received chirps of the preamble and the accumulated values exceeding the threshold, its symbol reception. Using this symbol alignment, the receiver may await a single opposite chirp after the sequence of training chirps. The single opposite chirp may indicate data alignment and comprise an encoded identifier. The receiver may reject the message and terminate further message processing based on the encoded identifier being a mismatch to a preconfigured identifier.