There is provided a distortion cancellation device including a memory, and a processor coupled to the memory and the processor configured to, acquire a transmission signal to be wirelessly transmitted, acquire a reception signal to which an intermodulation signal generated due to the transmission signal wirelessly transmitted is added, generate a replica signal of the intermodulation signal from the transmission signal, detect an arrival time of the intermodulation signal, based on a correlation operation using a sample of a signal sequence of the replica signal and a sample of the acquired reception signal, the signal sequence having a duration corresponding to a detection range, and cancel the intermodulation signal in the reception signal, based on the detected arrival time.

A system is provided that can introduce data redundancy into wireless communications, and in particular ultra-wideband (UWB) wireless communications to increase the communication range when transmitting data that has low transmission rates. Multipath degradation, introduced by the extended communications range, can be mitigated by frequency hopping between the orthogonal frequency-division multiplexed symbols of the ultra-wideband waveform. Frequency hopping can place adjacent symbols in different frequency channels for filtering. Data redundancy can be expanded in the time domain and/or the frequency domain, resulting in extended range.

A radio frequency (RF) communications system may include a first RF node that transmits data, including a new frequency of operation, and a sequence of pilot symbols spread with a complex spreading code sequence. A second RF node may receive an incoming signal from the first RF node and perform despreading for N sample offset delays to generate N despreading sequences for the sequence of pilot symbols. The second RF node may perform a cross-correlation to select a desired despreading sequence from the N despreading sequences, determine a phase offset and timing offset, process the incoming signal based upon the desired despreading sequence, phase offset and timing offset, and switch to the new frequency of operation.

There is provided a distortion cancellation device including a memory, and a processor coupled to the memory and the processor configured to, acquire a transmission signal to be wirelessly transmitted, acquire a reception signal to which an intermodulation signal generated due to the transmission signal wirelessly transmitted is added, generate a replica signal of the intermodulation signal from the transmission signal, detect an arrival time of the intermodulation signal, based on a correlation operation using a sample of a signal sequence of the replica signal and a sample of the acquired reception signal, the signal sequence having a duration corresponding to a detection range, and cancel the intermodulation signal in the reception signal, based on the detected arrival time.

There is provided a distortion cancellation device including a memory, and a processor coupled to the memory and the processor configured to, acquire a transmission signal to be wirelessly transmitted, acquire a reception signal to which an intermodulation signal generated due to the transmission signal wirelessly transmitted is added, generate a replica signal of the intermodulation signal from the transmission signal, detect an arrival time of the intermodulation signal, based on a correlation operation using a sample of a signal sequence of the replica signal and a sample of the acquired reception signal, the signal sequence having a duration corresponding to a detection range, and cancel the intermodulation signal in the reception signal, based on the detected arrival time.

A radio frequency (RF) communications system may include a first RF node that transmits data, including a new frequency of operation, and a sequence of pilot symbols spread with a complex spreading code sequence. A second RF node may receive an incoming signal from the first RF node and perform despreading for N sample offset delays to generate N despreading sequences for the sequence of pilot symbols. The second RF node may perform a cross-correlation to select a desired despreading sequence from the N despreading sequences, determine a phase offset and timing offset, process the incoming signal based upon the desired despreading sequence, phase offset and timing offset, and switch to the new frequency of operation.

A system is provided that can introduce data redundancy into wireless communications, and in particular ultra-wideband (UWB) wireless communications to increase the communication range when transmitting data that has low transmission rates. Multipath degradation, introduced by the extended communications range, can be mitigated by frequency hopping between the orthogonal frequency-division multiplexed symbols of the ultra-wideband waveform. Frequency hopping can place adjacent symbols in different frequency channels for filtering. Data redundancy can be expanded in the time domain and/or the frequency domain, resulting in extended range.

In a direct sequence spread-spectrum (DSSS) systems, such as CDMA, information is encoded in symbols using phase shift keying or quadrature amplitude modulation. Further, a transmitter applied a selected time shifted lag to each symbol to convey additional information. A receiver detects both the symbol data and the lag value. The receiver can use a hermetic matched filter matrix to identify the lag.

In a direct sequence spread-spectrum (DSSS) systems, such as CDMA, information is encoded in symbols using phase shift keying or quadrature amplitude modulation. Further, a transmitter applied a selected time shifted lag to each symbol to convey additional information. A receiver detects both the symbol data and the lag value. The receiver can use a hermetic matched filter matrix to identify the lag.