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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Journal ArticleDOI
Correction to "Design and Experimental Results for a Direct-Sequence Spread-Spectrum Radio Using Differential Phase-Shift Keying Modulation for Indoor, Wireless Communications"
Mohsen Kavehrad,G. E. Bodeep +1 more
TL;DR: The design and implementation of a transmitter and a receiver using a surface acoustic wave filter matching the spread-spectrum code of a user and the receiver performance is within 1 dB of the theoretical performance of a differential phase-shift keying (DPSK) receiver in the presence of additive white Gaussian noise.
Patent
CW Interference cancelling system for spread spectrum signals
TL;DR: In this article, the authors proposed an orthogonal multiplexed noise codes, which when detected in a matched filter detector and linearly added, compress to a lobeless impulse.
Patent
Method of and apparatus for transmitting and receiving coded digital signals
TL;DR: In this paper, the most important bits are encoded into a (7,k) 8-ary Reed Solomon code where 7 is the length of the code and k is the dimension of the codes.
Patent
Digital audio transmission
TL;DR: In this article, a digital sub-band coder for audio signals provides for adaptive allocation of bits to (eg) two sub-bands by reference only to those bits which are always transmitted, so that decoding can take place without the need for transmission of side information.
Patent
Integrated communications system for HDLC variable-length data packets and fixed-length voice/video packets
TL;DR: In this article, a frame sync code is transmitted from one end of a transmission channel, and the cell identifier and each of the cells are assembled into a field and a plurality of such fields are assembled to form a frame for transmission.