Abstract:
A data processor selects a set of BOC correlations in accordance with a BOC correlation function for the sampling period if the primary amplitude exceeds or equals the secondary amplitude for the sampling period. The data processor selects a set of QBOC correlations in accordance with a QBOC correlation function for the sampling period if the secondary amplitude exceeds the primary amplitude for the sampling period. The data processor uses either the BOC correlation function or the QBOC correlation function, whichever with greater amplitude, at each sampling period to provide an aggregate correlation function that supports unambiguous code acquisition of the received signal.
Abstract:
A method for generating and transmitting positioning signals using a network of terrestrial beacons, comprising generating, at a first beacon, a first positioning signal using a first pseudorandom number sequence, generating, at a second beacon, a second positioning signal using a second pseudorandom number sequence, broadcasting the first positioning signal during a first time slot of a transmission frame, and broadcasting the second positioning signal during a second time slot of the transmission frame.
Abstract:
A data processor selects a set of BOC correlations in accordance with a BOC correlation function for the sampling period if the primary amplitude exceeds or equals the secondary amplitude for the sampling period. The data processor selects a set of QBOC correlations in accordance with a QBOC correlation function for the sampling period if the secondary amplitude exceeds the primary amplitude for the sampling period. The data processor uses either the BOC correlation function or the QBOC correlation function, whichever with greater amplitude, at each sampling period to provide an aggregate correlation function that supports unambiguous code acquisition of the received signal.
Abstract:
A method for generating and transmitting positioning signals using a network of terrestrial beacons, comprising generating, at a first beacon, a first positioning signal using a first pseudorandom number sequence, generating, at a second beacon, a second positioning signal using a second pseudorandom number sequence, broadcasting the first positioning signal during a first time slot of a transmission frame, and broadcasting the second positioning signal during a second time slot of the transmission frame.
Abstract:
The current invention concerns a method and a device for generating a signal representing data. The method for generating a signal comprises modulating a portion (1 P, 2P) of the data using phase shift keying and spreading the modulated portion over the at least one frequency base band using at least one highly auto-correlated spread code sequence (1C, 2C) associated with the frequency base band. The method for generating a signal is characterized by delaying, according to a delay determined using a remainder (1R, 2R) of the data (ID), the at least one spread code sequence (1C, 2C) by a time delay wherein the modulated portion (1 MP, 2MP) is spread according the delayed spread code sequence (1DC, 2DC). This allows for additional bit rate through encoding of the data remainder in the delay.
Abstract:
A method for generating a preamble of a data unit for transmission via a communication channel includes generating a first field of the preamble using one of a first sequence or a second sequence, such that the first sequence and the second sequence are complementary sequences such that a sum of out-of-phase aperiodic autocorrelation coefficients of the first sequence and the second sequence is zero; generating, using the other one of the first sequence or the second sequence, an indicator of a start of a second field of the preamble, the second field associated with channel estimation information, such that the indicator of the start of the second field immediately follows the first field; and generating the second field of the preamble.