69 results about "Binary phase shift keying bpsk" patented technology

Embodiments are directed to binary phase shift key modulating a first pilot symbol according to a reference sequence, and differentially binary phase shift key modulating a second pilot symbols. The original reference sequence and the delayed differentially modulated sequence are then combined before performing an Inverse Fast Fourier Transform and inserting a guard interval. Receiver operations are an inverse of the transmitter operations, which were just discussed. The receiver does not have to know the reference sequence. Embodiments are directed to specifying a plurality of seeds that are bit patterns each having r bits not all of which have a value of zero, extending the seeds into respective sequences by applying to each seed a recurrence formula; and using one of the sequences as a comb sequence and using the sequences other than the comb sequence as binary phase shift keying patterns.

An embodiment of the present invention relates to an ultra low power wideband asynchronous binary phase shift keying (BPSK) demodulation method and a circuit configuration thereof. The ultra low power wideband asynchronous BPSK demodulation circuit comprises a sideband division and upper sideband signal delay unit dividing a modulated signal into an upper sideband and a lower sideband by a first order high-pass filter and a first order low-pass filter; a data demodulation unit latching, through a hysteresis circuit, a signal generated by a difference between the analog signals in which a phase difference between the delayed upper sideband analog signal and the lower sideband analog signal is aligned at 0°, so as to demodulate digital data; and a data clock recovery unit for generating a data clock by using a signal digitalized from the lower sideband analog signal through a comparator and a data signal.

The invention discloses a method for recognizing a satellite communication signal modulation way. According to the scheme, the method comprises the following steps: 1, filtering a received signal to obtain a signal to be recognized; performing power spectrum smoothening, carrier frequency estimation and coherent demodulation on the signal to be recognized to obtain a demodulated signal; 3, estimating the code element rate of the demodulated signal; 4, determining whether the received signal is a binary phase shift keying signal or not by using a square spectrum; 5, determining whether the received signal is a quaternary phase shift keying signal or a hexadecimal quadrature amplitude modulation signal by using a signal quartic spectrum, carrier frequency and the code element rate; 6, determining whether the received signal is an octonary phase shift keying signal or not by using a signal eightfold spectrum; and 7, determining whether the received signal is a hexadecimal amplitude phase shift keying signal or not by using a signal duodenary spectrum, the carrier frequency and the code element rate. The method has high recognition accuracy, and can be applied to real-time monitoring of satellite communication signals. Through adoption of the method, totally-blind real-time recognition of the satellite communication signal modulation way can be realized.

A transmission method using a massive MIMO (Multiple-Input and Multiple-Output) scheme with an arrangement 108 of Nm×Nb antenna elements at the transmitter, arranged in Nm sets of Nb antenna elements or Nb sets of Nm antenna elements based on SC-FDE (Single-Carrier with Frequency Domain Equalization) schemes with large constellations that is compatible with low-cost, highly-efficient, nonlinear amplifiers 106, while allowing spatial multiplexing gains.The transmission structure of this transmission method decomposes in 103 the modulated symbols from 102 associated to a given constellation as the sum of Nm polar components that are modulated as Nm BPSK (Binary Phase Shift Keying) signals. Each of these BPSK signals can be regarded as an OQPSK (Offset Quadrature Phase Shift Keying) signal in the serial format that is specially designed to have good tradeoffs between reduced envelope fluctuations and a compact spectrum.