Patent
System and method for generating signal waveforms in a CDMA cellular telephone system
Klein S. Gilhousen,Irwin M. Jacobs,Roberto Padovani,Lindsay A. Weaver,Wheatley Charles E,Andrew J. Viterbi +5 more
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TLDR
In this paper, a system and method for communicating information signals using spread spectrum communication techniques is presented, where PN sequences are constructed that provide orthogonality between the users so that mutual interference will be reduced, allowing higher capacity and better link performance.Abstract:
A system and method for communicating information signals using spread spectrum communication techniques. PN sequences are constructed that provide orthogonality between the users so that mutual interference will be reduced, allowing higher capacity and better link performance. With orthogonal PN codes, the cross-correlation is zero over a predetermined time interval, resulting in no interference between the orthogonal codes, provided only that the code time frames are time aligned with each other. In an exemplary embodiment, signals are communicated between a cell-site and mobile units using direct sequence spread spectrum communication signals. In the cell-to-mobile link, pilot, sync, paging and voice channels are defined. Information communicated on the cell-to-mobile link channels are, in general, encoded, interleaved, bi-phase shift key (BPSK) modulated with orthogonal covering of each BPSK symbol along with quadrature phase shift key (QPSK) spreading of the covered symbols. In the mobile-to-cell link, access and voice channels are defined. Information communicated on the mobile-to-cell link channels are, in general, encoded, interleaved, orthogonal signaling along with QPSK spreading.read more
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Patent
Apparatus for coding and decoding a broad-band transmission
TL;DR: In this article, a method for coding radio emissions by spectrum spreading using a PN code is presented, where the useful signal (S) is phase modulated by a modulator (11) 0-π controlled by a pseudorandom formed by the combination by majority logic sequence of an odd number of elementary codes formed by pseudo-random binary sequences of different lengths.
Patent
Receiver in a system operating with band spreading (spread-spectrum)
TL;DR: In this paper, the authors proposed an OR gate for receiver synchronisation in a spread-spectrum system, in which two or more mutually orthogonal spread spectrum signal shapes are used for transmission, for receiver synchronization the output signals, rectified in envelope detectors, of filters (1) signal-adapted to these signal shapes, are compared individually with thresholds and the output signal of the threshold circuits (12) are further processed in an OR-gate.
Patent
Data transmission method
TL;DR: In this article, the parity code found for the character codes is divided into a plurality of bit groups, a divided parity data having a predetermined bit number with a predetermined code that is not in agreement with the above predetermined transmission control code, is formed for each of the divided bit groups.
Patent
Time delay compensation in a radio transceiver
TL;DR: In this paper, a radio receiver, such as a mobile cellular radio telephone, is provided having a receiver section, a transmitter section, and a control unit for controlling timing of transmissions, and means for generating a predetermined signal (preferably the same as the preamble code transmitted by a base station) and feeding this signal through the transmitter section.