摘要:
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.
摘要:
An embodiment of the present invention provides an apparatus, comprising a transmitter operable to communicate in a wireless network and adapted to use an efficient Golay correlator running at 1.5 times a sampling rate.
摘要:
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.
摘要:
The frequency spectrum of a transmission system is spread in the transmitter (1) by information bit encoding by means of Golay complementary sequence pairs. The spectrum is picked up in the receiver (2) and passed through a filter that is adapted to the characteristics of said frequencies enabling detection of digital levels corresponding to the transmitted original information. If θ pairs of orthogonal sequences, Α amplitudes for data modulation and N-PSK modulation are used, it is possible to obtain transmission speed (C) which equals formula (I), wherein B is the null-to-null bandwidth used in Hertz. This makes it possible to improve quality in comparison with other digital communication systems using spread-spectrum techniques and CDMA. A process gain independent of transmission speed is obtained.
摘要:
La présente invention concerne une station de base d'un système de télécommunication radiomobile, caractérisée en ce que ladite station de base transmet un signal de synchronisation comprenant un premier code de Golay et un second code de Golay qui suit ledit premier code de Golay, ledit second code de Golay étant complémentaire du premier code de Golay et connecté audit premier code de Golay par au moins une extension périodique du premier code de Golay et une extension périodique du second code de Golay, ladite extension périodique dudit premier code de Golay étant une réplique tronquée du premier code de Golay et ladite extension périodique dudit second code de Golay étant une réplique tronquée du second code de Golay. Ladite invention concerne également un système de télécommunication par radio ainsi qu'une méthode de synchronisation pour synchroniser des stations de base d'un système de télécommunication par radio.
摘要:
Certain aspects of the present disclosure relate to a method for generating a frame structure that can be used with multiple transmission schemes, such as a Single Carrier (SC) transmission scheme and an Orthogonal Frequency Division Multiplexing (OFDM) transmission scheme.