Disclosed are a modulation method, demodulation method, and apparatus for multi-user information transmission. The modulation method comprises: a transmitter determines a first modulation symbol and a second modulation symbol according to a first information bit, a second information bit, and a mapping table, the mapping table being used for determining a corresponding relation between the first information bit and the first modulation symbol and a corresponding relation between the second information bit and the second modulation symbol, each group of modulation symbols in the mapping table being superposed and mapped to a constellation diagram to achieve a Gray attribute; and the transmitter superposes the first modulation symbol and the second modulation symbol to obtain a superposed symbol.

A receiver for reducing an interference component in a receive signal is provided. The interference component is caused by a first interferer emitting payload data and a second interferer emitting only broadcast data for communication control. The receiver includes a first compensation circuit configured to generate a first compensation signal based on a component of the receive signal received from the first interferer. Further, the receiver includes a second compensation circuit configured to generate a second compensation signal based on only a-priori knowledge of at least one broadcast channel carrying the broadcast data, or based on a detection of symbols in the receive signal which represent the broadcast data. The detection of symbols is based on only the a-priori knowledge of the at least one broadcast channel. The receiver also includes a combination circuit configured to combine the receive signal, the first compensation signal and the second compensation signal.

A signal sending and demodulation method, a device, and a system are provided, relate to the field of communications technologies, and can resolve a prior-art problem of a low user throughput caused by mismatch between poor PDCCH signal demodulation performance and PDSCH signal demodulation performance. A specific solution is as follows: A base station of a serving cell obtains a first power ratio restriction set preset by a base station of at least one interfering cell; sends a preset second power ratio restriction set and the first power ratio restriction set to a terminal; and sends a second original PDCCH signal to the terminal, where a current value of a second power ratio of the second original PDCCH signal is an element selected from the second power ratio restriction set. Embodiments of the present invention are used for signal demodulation.

A data transmission method includes steps of: acquiring, by a network side, a current data transmission rule, the current data transmission rule including a mapping relationship between currently-scheduled K UEs and data layers on N transmission resources corresponding to a selected encoding matrix, one UE at least occupying one data layer; and transmitting, by the network side, data to the K UEs in accordance with the current data transmission rule.

The present invention is directed to the selective provision of interference canceled signal streams to demodulating fingers in a communication receiver. According to the present invention, potential interferer signal paths are identified. Signal streams having one or more potential interferer signals removed or canceled are created, and a correlation is performed to determine whether the strength of a desired signal path increased as a result. If the correlation indicates that the strength of a desired signal path was increased by the signal cancellation, the interference canceled signal stream is provided to the demodulation finger assigned to track the desired signal path. If the correlation determines that the strength of the desired signal path did not increase as a result of performing interference cancellation, the raw or a different interference canceled signal stream is provided to the demodulation finger.

The present disclosure provides a method and a receiver for detecting synchronization in a Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) system. The receiver includes a reception unit that receives a synchronization signal including an interference signal from at least one adjacent cell; and a synchronization detector that cancels the interference signal included in the synchronization signal based on a serial interference cancellation, and detects the synchronization based on the synchronization signal, from which the interference signal is canceled.

Disclosed herein are an apparatus and method for receiving a signal based on FTN. The apparatus for receiving a signal based on FTN includes an equalizer for creating a Log Likelihood Ratio (LLR) sequence by equalizing an FTN signal sequence sampled at an FTN signaling rate; a deinterleaver for deinterleaving the created LLR sequence; a decoder for decoding the LLR sequence by correcting errors in the deinterleaved LLR sequence; an interleaver for interleaving the decoded LLR sequence and providing the interleaved LLR sequence to the equalizer; and an FTN interference estimation unit for providing the FTN signal sequence, from which an FTN interference sequence is eliminated, to the equalizer, using the interleaved LLR sequence.

A user device receives, from a base station, a radio signal in which non-orthogonal signals are mixed. The user device recognizes, based on information transmitted from the base station, a parameter associated with the location of the user device. When the user device is at the edge of the cell area of the base station, a demodulator of the user device demodulates, as a signal directed to the user device, the radio signal in which an interference signal component has been suppressed by an interference rejection combining processor of the user device and a non-orthogonal signal canceller of the user device does not operate. When the user device is within the cell area and is not at the edge of the cell area, until the demodulator demodulates the signal directed to the user device, the interference rejection combining processor suppresses an interference signal component in a non-orthogonal signal outputted from the non-orthogonal signal canceller and the demodulator demodulates the non-orthogonal signal in which the interference signal component has been suppressed by the interference rejection combining processor.

Successfully decoded data received from a mobile terminal as well as the transmission format of that data is relayed over the backhaul from a base station receiver that successfully decoded the mobile terminal's transmission to the base stations in the mobile terminal's active set that presumably were unable to decode the mobile terminal's transmission due to inadequate signal-to-noise ratio. A base station that receives this transmission from the relaying base station that did successfully decode and demodulate the mobile terminal's transmission is then able to reconstruct the data and subtract it from the total interference, thereby increasing the signal-to-noise ratio at this base station for its in-cell processing.

An electronic device and method for signal detection in a wireless communication system is provided. The electronic device includes a receiving unit configured to receive a radio frequency (RF) signal, a control unit configured to process the received signal, wherein processing the received signal comprises canceling a signal corresponding to a first stage in the received signal, detecting a signal corresponding to a second stage by applying lattice reduction, and determining a final detected signal by combining the detected signal corresponding to the second stage with candidates of the signal corresponding to the first stage.