A radar sensing system for a vehicle includes a transmitter, a receiver, and an interference mitigation processor. The transmitter transmits radio signals. The receiver receives radio signals. The received radio signals include reflected radio signals that are each transmitted radio signals reflected from objects in the environment. The receiver also down-converts and digitizes the received radio signals to produce a baseband sampled stream. The interference mitigation processor produces a second received radio signal that includes reflected radio signals that are transmitted radio signals reflected from a first object. The interference mitigation processor uses the second received radio signal to remove selected samples from the baseband sampled stream that are attributed to radio signals reflected from the first object to produce a modified baseband sampled stream. The receiver uses the modified baseband sampled stream to detect a second object more distant than the first object.

Systems and methods are disclosed that attempt to increase spectral efficiency by using Faster-than-Nyquist (FTN) transmission. In one embodiment, a method at a transmitter includes partitioning bits into K bit streams, obtaining K power scaled symbol streams, combining the K power scaled symbol streams to obtain a stream of transmission symbols, and transmitting the stream of transmission symbols using FTN signaling. At the receiver, the received symbols are partitioned into K symbol streams, and demodulation and decoding is performed by: (i) demodulating and decoding the K.sup.th symbol stream of the K symbol streams to obtain a K.sup.th set of bits; (ii) mapping the K.sup.th set of bits to a K.sup.th set of symbols; and (iii) for each one of k=K−1, . . . , 1: demodulating and decoding a k.sup.th symbol stream of the K symbol streams to obtain a k.sup.th set of bits. The demodulating and decoding includes performing interference cancellation.

Real-time selection of interference cancellation schemes based on transmission parameters and amount of resource overlap between the desired payload and the interfering payload. Codeword level interference cancellation may be performed where the signal quality of the interfering signal indicates that the interfering payload will be decoded correctly. When performed, codeword level interference cancellation may be monitored to determine if decoding the interfering payload is converging. Other interference cancellation schemes may be selected based on the signal quality of the interfering signal or non-converging decode of the interfering payload. The number of iterations for iterative decoding in codeword level interference cancellation may be dynamically selected. The decoder output (e.g., soft bits) may be used to perform interference cancellations before the decoder is fully converged. Iterative decoding may be performed in multiple passes and soft decision output form one pass may be used to initialize the decoder for a subsequent pass.

Spatial Multiplexing (SM) with Multiple Input Multiple Output (MIMO) is used in many wireless communication systems for providing high data rate in a given channel bandwidth. When SM-MIMO is used for sharing the same resources for multiple users (MU-SM), the control information describing the parameters of MU-SM need to be sent separately to all the users that may be sharing the same resources. The base station in a wireless communication system may only provide the parameters required by each specific client terminal for decoding the data addressed to it. A method and apparatus are disclosed that enable improved decoding of MU-SM signals in scenarios where information about the parameters of other transmissions on the same resources or absence of any transmission other than the one intended for the subject client terminal is not available.

Non-linear interference cancellation techniques are provided for wireless transceivers. Non-linear reduction of interference of a transmit signal on a received signal in a transceiver device, comprises applying the transmit signal to a first non-linear system; applying the received signal to a second non-linear system; and subtracting an output of the first non-linear system output from an output of second non-linear system output to produce an interference mitigated received signal. The first non-linear system and/or the second non-linear system can be implemented using one or more of a Volterra series and a Generalized Memory Polynomial Model. System parameters of the first non-linear system and/or the second non-linear system are adapted to reduce a power of the interference mitigated received signal.

The present disclosure relates to a 5G or pre-5G communication system for supporting a higher data transmission rate than a 4G communication system such as LTE. The present disclosure provides a method for transmitting messages using a channel combining/splitting transmission scheme. The method comprises the steps of: splitting the messages into a first part to be transmitted to a first channel, which is a degradation channel, and a second part to be transmitted to a second channel, which is an enhancement channel, generating first modulation signals by performing a channel encoding and frequency quadrature amplitude modulation (FQAM) on the first part and generating second modulation signals by performing a channel encoding and quadrature amplitude modulation (QAM) on the second part, generating first transmission signals by combining the first modulation signals with a part of or all the second modulation signals and generating second transmission signals using the second modulation signals, and transmitting the generated first transmission signals and second transmission signals through the first channel and the second channel, respectively.

A mobile communication device including a wireless transceiver and a controller is provided. The wireless transceiver includes a single interference cancellation or suppression receiver and is configured to perform wireless transmission and reception to and from a cellular station. The controller is configured to receive signaling information of a Multi-User Superposition Transmission (MUST) operation from the cellular station via the wireless transceiver, determine whether to perform a Network-Assisted Interference Cancellation and Suppression (NAICS) operation or the MUST operation according to the signaling information, and not perform both the NAICS operation and the MUST operation simultaneously.

System and methods are disclosed in which pilots are used to assist in identifying grant-free uplink transmissions originating from the same UE. In one embodiment, a base station receives a grant-free uplink transmission that carries initial data from a user equipment and an initial pilot. The initial pilot is successfully decoded and the initial data is unsuccessfully decoded. The successfully decoded initial pilot and the unsuccessfully decoded initial data are stored in memory. Another grant-free uplink transmission carrying retransmission data from the user equipment and a retransmission pilot is then received. The retransmission pilot is successfully decoded and used to identify the successfully decoded initial pilot in the memory and the unsuccessfully decoded initial data. The retransmission data and the unsuccessfully decoded initial data are used to successfully decode the initial data.

Control information associated with a transmission layer of a downlink transmission for a co-scheduled UE may be included in a companion DCI message. The companion DCI message may be sent to a first UE in addition to a self DCI message that communicates information associated with a transmission layer of the downlink transmission for the first UE. For example, a base station may transmit a self DCI message associated with a first transmission layer for a first UE and a companion DCI message associated with a second transmission layer for a co-scheduled UE in a control channel. The first UE may identify the self DCI message and the companion DCI message, and may then receive the downlink transmission based on the self and companion DCI messages. The UE may decode the downlink transmission based on the information included in both the self DCI message and the companion DCI message.

Symbol replica precision is improved when symbol-level cancellation is performed in a receiver in downlink non-orthogonal access. Transmission is performed by multiplexing a transmission scheme by which excellent performance is obtained during demodulation and a transmission scheme by which excellent performance is obtained during decoding. Provided is a base station device including an addition unit that adds a number of signals the number exceeding a number of transmit antenna ports at the same time and the same frequency, and performing transmission from one or more transmit antenna ports. The addition unit adds signals generated by mutually different transmission schemes. Provided is a terminal device that receives a signal in which a number of signals generated by mutually different transmission schemes are added, the number exceeding a number of transmit antenna ports, at the same time and the same frequency. The terminal device includes a demodulation unit that performs demodulation processing for at least one of the mutually different transmission schemes, a replica generation unit that generates a symbol replica by using an output from the demodulation unit, and a cancellation unit that subtracts the symbol replica from the received signal.