DIFFERENTIAL PHASE ENCODING APPARATUS AND METHOD OF CPM SPREAD SPECTRUM COMMUNICATION

Title:

DIFFERENTIAL PHASE ENCODING APPARATUS AND METHOD OF CPM SPREAD SPECTRUM COMMUNICATION

Document Type and Number:

Japanese Patent JP3730236

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To provide an apparatus and a method for conducting differential phase encoding on a CPM spread spectrum signal.
SOLUTION: A phase determining circuit has a phase selection signal connected to a register as an input for its output. A phase selector has the phase selection signal as a first input, a symbol code as a second input, and a phase encoded signal as its output. The phase encoded signal comprises chip streams, and a switch outputs even chip streams and odd chip streams. An odd modulator connected to a first waveform from an odd waveform generator responding to odd chip streams and connected to a first carrier and an even modulator connected to a second waveform from an even waveform generator responding to even chip streams, and connected to a second carrier, are equipped, and phases of the first carrier and the second carrier are offset at only 90°, and an output from each modulator is added and composed to be outputted.

Inventors:

Randolph El Durant
Mark ti barbatch
Eugene Pee Hoyt

Application Number:

JP2003189691A

Publication Date:

December 21, 2005

Filing Date:

July 01, 2003

Export Citation:

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Assignee:

Xircom Wireless, Inc.

International Classes:

H04B1/26; H04B1/04; H04B1/707; H04L27/20; H04L27/227; H04L27/233; H04J13/00; H04J14/00; (IPC1-7): H04J13/04; H04L27/20

Domestic Patent References:

JP685862A
JP62122349A
JP58034661A
JP4035337A
JP3504675A
JP6077929A
JP746152A
JP629946A

Foreign References:

US5276705
US5305349
US4559606
US4587662
US5151920
EP0501829A1

Attorney, Agent or Firm:

Aoyama Aoi
Osamu Kawamiya
Masahiro Ishino

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