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 Title: |
US5311176:
Method and apparatus for generating Walsh codes
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Gurney, David P.; Palatine, IL
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| Assignee: |
Motorola, Inc., Schaumburg, IL
other patents from MOTOROLA, INC. (386735) (approx. 18,357)
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| Published / Filed: |
1994-05-10
/ 1992-03-31
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| Application Number: |
US1992000860871
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| IPC Code: |
Advanced:
G06F 1/025;
H04J 11/00;
Core:
more...
IPC-7:
G06F 7/36;
H03M 7/00;
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| ECLA Code: |
G06F1/025W;
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| U.S. Class: |
Current:
341/050;
708/410;
Original:
341/050;
364/727;
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| Field of Search: |
370/022
364/727
341/050
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| Priority Number: |
| 1992-03-31 |
US1992000860871 |
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| Abstract: |
A method and apparatus is provided for generating Walsh codes. A first group of address signals is generated. Subsequently, inversion control signals are generated by logically gating the first group of address signals with a second group of address signals. Finally, a Walsh code is produced by inverting elements of a predetermined vector in accordance with the generated inversion control signals.
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| Attorney, Agent or Firm: |
Dempster, Shawn B. ;
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| Primary / Asst. Examiners: |
Williams, Howard L.;
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| Maintenance Status: |
E3 Expired Check current status
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| INPADOC Legal Status: |
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| Family: |
None
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First Claim:
Show all 16 claims |
What is claimed is:
1. A Walsh code generator, comprising:
- (a) counter means for generating a first group of address signals;
- (b) address means, operatively coupled to the counter means, for generating inversion control signals by logically gating the first group of address signals with a second group of address signals; and
- (c) code inversion means, operatively coupled to the address means, for producing a Walsh code by inverting elements of a predetermined non-null vector through an Exclusive-OR logical gating with the generated inversion control signals.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 29 U.S. patent(s) that reference this one
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| Foreign References: |
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| Other Abstract Info: |
DERABS G1994-150615
DERABS G1994-150615
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| Other References: |
Dixon, Robert C., Spread Spectrum Systems 2nd Ed., John Wiley & Sons, New York, N.Y., 1984 Chapters 1 & 2, pp. 1-55.
Sklar, Bernard, Digital Communications: Fundamentals and Applications, Prentice Hall, Englewood Cliffs, N.J., 1988, Chapters 5 & 6 pp. 245-380.
"Two Classes of Convolutional Codes Over GF(q) for q-ary Orthogonal Signaling", William E. Ryan and Stephen G. Wilson, IEEE Transactions on Communications, vol. 39, No. 1 (Jan. 1988), pp. 30-40.
"On the System Design Aspects of Code Division Multple Access (CDMA) Applied to Digital Cellular and Personal Communication sNetworks", Allen Salmasi and Klein S. Gilhousen, Proceedings of 41st Vehicular Technology Conference in St. Louis, Mo., May 19-22, 1991, pp. 57-62.
"Performance of Convolutional Codes with Interleaving in the Interference Limited Rayleigh Fading Channel", Li Fung Chang and Sirikiat Ariyavisitakul, Proceedings of 41st Vehicular Technology Conference in St. Louis, Mo., May 19-22, 1991, pp. 812-816.
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