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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Watermark embedder and reader
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Patent
Multiple phase PSK demodulator
TL;DR: In this article, a multiple phase PSK demodulator for use in a spread spectrum communication system includes a plurality of baseband frequency converters coupled to a corresponding plurality of differential decoders in order to directly recover the encoded PSK data.
Patent
Masked data transmission system
TL;DR: In this paper, a method and apparatus for masking the presence and content of data transmissions includes a mobile transmitter which encodes the data by means of a pseudorandom spreading (PRS) code having a chip rate, and which transmits it at a carrier frequency.
Patent
Methods and apparatus for generating walsh functions
TL;DR: In this article, a selection register receives the row address of a given row in a Hadamard array which corresponds to the desired Walsh functions, and a binary counter receives the column address at which generation of the Walsh function is to begin and the outputs of the register and counter are selectively ''''AND''''ed and '''''OR''''ed, according to a predetermined procedure.
Patent
Adaptive linear prediction filters
Nakamura Makoto,Fumio Sugiyama +1 more
TL;DR: An improved linear prediction filter based on the PARCOR lattice structure of Itakuro and Saito, replaces the correlator by a recursive loop including a coefficient generator, coefficient corrector, and attenuator, such that the corresponding filter output is suppressed to a minimum value as mentioned in this paper.