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US5715236A Expired / Lapsed US ⏱️ 0.0 years remaining

System and method for generating signal waveforms in a CDMA cellular telephone system

Assignee: Qualcomm Inc
•
Filing: 1993-11-24
•
Granted: 1998-02-03
•
Expires: 2013-11-24
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Abstract

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 signalling along with QPSK spreading.

Inventors

  • 👤 Klein S. Gilhousen
  • 👤 Irwin M. Jacobs
  • 👤 Roberto Padovani
  • 👤 Lindsay A. Weaver, Jr.
  • 👤 Charles E. Wheatley, III
  • 👤 Andrew J. Viterbi

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 11:16
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/0001; H04L1/0002; H04J; H04J13/00; H04J13/16; H04J13/18; H04L27/00; H04L27/26; H04L27/30; H04B; H04B1/00; H04B1/38; H04B1/3827; H04B1/3888; H04B1/69; H04B1/707; H04B1/7073; H04B1/7075; H04B1/70757; H04B1/709; H04B7/00; H04B7/24; H04B7/26; H04B7/2618; H04B7/2628; H04B7/2637; H04J11/00; H04J13/0007; H04J13/0022; H04J13/004; H04J13/0048; H04J13/10; H04J13/102; H04J13/107; H04L1/0006; H04L1/004; H04L1/0056; H04L1/0064; H04L1/0065; H04L1/0067; H04L1/0068; H04L1/0071; H04L1/02; H04L1/06; H04L23/00; H04L23/02; H04L5/00; H04L5/02; H04L5/12; H04B1/7097; H04B1/711; H04B1/7115; H04B2201/00; H04B2201/69; H04B2201/707; H04B2201/70701; H04B2201/70703; H04L1/0045; H04L1/0046; H04L1/08; H04W; H04W52/00; H04W52/04; H04W52/18; H04W52/26; Y; Y02; Y02D; Y02D30/00; Y02D30/50

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 64 words
A modulation system for use in spread spectrum communications, comprising: means for generating a first orthogonal sequence signal corresponding to a selected one of a plurality of orthogonal binary sequences; means for generating a pseudo-noise (PN) signal corresponding to a predetermined PN binary sequence; means for combining said first orthogonal sequence signal and said PN signal and for providing a resultant first modulation signal.
Claim 2
Dependent Claim 64 words
A modulation system for use in spread spectrum communications, comprising: means for generating a first orthogonal sequence signal corresponding to a selected one of a plurality of orthogonal binary sequences; means for generating a pseudo-noise (PN) signal corresponding to a predetermined PN binary sequence; means for combining said first orthogonal sequence signal and said PN signal and for providing a resultant first modulation signal.
Claim 3
Dependent Claim 142 words
A high-capacity-spread-spectrum transmitter, handling at least spread-spectrum signals for use with a communications channel, comprising: a plurality of data signals; generic means for generating a generic-chip-code signal; a plurality of message means for generating a plurality of message-chip-code signal wherein each message-chip-code signal is orthogonal to the other message-chip-code signals of plurality of message-chip-code signals, and is synchronized to the generic-chip-code signal; a plurality of spreading means coupled to said demultiplexer means and said plurality of message means, respectively, for spread-spectrum processing the plurality of demultiplexed-data signals with the plurality of message-chip-code signals to generate a plurality of spread-spectrum processed signals, respectively; summer means for combining the generic-chip-code signal with the plurality of spread-spectrum processed signals; transmitter means for transmitting the combined generic-chip-code signal and plurality of spread-spectrum-processed signals, on a carrier signal over said communications channel as a spread-spectrum communications signal.
Claim 4
Dependent Claim 142 words
A high-capacity-spread-spectrum transmitter, handling at least spread-spectrum signals for use with a communications channel, comprising: a plurality of data signals; generic means for generating a generic-chip-code signal; a plurality of message means for generating a plurality of message-chip-code signal wherein each message-chip-code signal is orthogonal to the other message-chip-code signals of plurality of message-chip-code signals, and is synchronized to the generic-chip-code signal; a plurality of spreading means coupled to said demultiplexer means and said plurality of message means, respectively, for spread-spectrum processing the plurality of demultiplexed-data signals with the plurality of message-chip-code signals to generate a plurality of spread-spectrum processed signals, respectively; summer means for combining the generic-chip-code signal with the plurality of spread-spectrum processed signals; transmitter means for transmitting the combined generic-chip-code signal and plurality of spread-spectrum-processed signals, on a carrier signal over said communications channel as a spread-spectrum communications signal.
Claim 5
Dependent Claim 82 words
The high-capacity-spread-spectrum transmitter as set forth in claim 2, wherein: said generic means includes a transmitter-generic-chip-code generator for generating the generic-chip-code signal; each of said message means includes a transmitter-message-code-chip generator synchronized to the generic-chip-code signal for generating the message-chip-code signal; each of said spreading means includes an EXCLUSIVE-OR gate for spread-spectrum processing the plurality of demultiplexed-data signals with the message-chip-code signal; and said summer means includes a combiner for combining the plurality of generic-chip-code signals and the plurality of spread-spectrum-processed signals.

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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 2001-02-02 2001-08-04 2002-02-03 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2005-02-02 2005-08-04 2006-02-03 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2009-02-02 2009-08-04 2010-02-03 $7700.00 Window Closed / Lapsed

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