Abstract: A Spotlight SAR imaging mode is implemented by a synthetic aperture radar (SAR) system in which an SAR controller intentionally spoils a transmit beam of the SAR antenna to form a spoiled transmit beam. The SAR system transmits pulses using the spoiled transmit beam, divides the SAR antenna into a plurality of azimuth apertures, receives received pulses by the SAR antenna using a number M of multiple receive beams, processes data received by each of the number M of multiple receive beams to generate a number M of sub-images by the SAR processor; and coherently combines two or more of the number M of sub-images to form a Spotlight image. Thus, a multi-aperture antenna comprises multiple azimuth apertures (i.e., a sub apertures), each formed from one or more azimuth phase centers. The sub-apertures can be independent from one another. The sub-apertures can keep a target illuminated by the beam for a longer time than conventional Stripmap mode, for example.

Abstract: A communications device may include a transmit path, a receive path operable simultaneously with the transmit path and at a same frequency as the transmit path, and processing circuitry. The processing circuitry may be configured to generate a baseband signal for the transmit path, generate a feedforward signal based upon the baseband signal, and use the feedforward signal to reduce self-interference in the receive path from the transmit path.

Abstract: A communications device may include a wireless receiver, and a processor coupled to the wireless receiver. The processor may be configured to receive a spread OFDM signal having narrowband interference associated with the same, the spread OFDM signal having subcarriers with data distributed among the subcarriers. The processor may be configured to excise the narrowband interference from the spread OFDM signal, and despread the spread OFDM signal after excising and based upon the excising to recover the data.

Abstract: A wireless communications device using a multi-carrier modulation communication signal may include a transmitter and a controller operable with the transmitter. The controller may be configured to reduce a peak-to-average power ratio (PAPR) associated with the multi-carrier modulation communication signal by at least generating a plurality of intermediate multi-carrier modulation communication signals based upon respective different permutations of a Walsh transformation matrix, and selecting a given intermediate multi-carrier modulation communication signal for transmission as the multi-carrier modulation communication signal based upon a PAPR associated therewith.

Abstract: A communications device may include a wireless receiver, and a processor coupled to the wireless receiver. The processor may be configured to receive a spread OFDM signal having narrowband interference associated with the same, the spread OFDM signal having subcarriers with data distributed among the subcarriers. The processor may be configured to excise the narrowband interference from the spread OFDM signal, and despread the spread OFDM signal after excising and based upon the excising to recover the data.

Abstract: A communications device may include a transmit path, a receive path operable simultaneously with the transmit path and at a same frequency as the transmit path, and processing circuitry. The processing circuitry may be configured to generate a baseband signal for the transmit path, generate a feedforward signal based upon the baseband signal, and use the feedforward signal to reduce self-interference in the receive path from the transmit path.