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Method and apparatus for noncoherent reception and correlation of a continous phase modulated signal    

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United States Patent5610940   
Link to this pagehttp://www.wikipatents.com/5610940.html
Inventor(s)Durrant; Randolph L. (Colorado Springs, CO); Burbach; Mark (Peyton, CO)
AbstractA technique for modulating and demodulating continuous phase modulation (CPM) spread spectrum signals and variations thereof. A transmitter encodes M data bits using a selected spread spectrum code, divides the spread spectrum code into a plurality of chip codes (such as even chips and odd chips), independently modulates the even and odd chips with orthogonal carrier signals using CPM or a related technique, and superposes the plurality of resultants for transmission. A receiver receives the superposed spread spectrum signal and divides it into a real signal and an imaginary signal. The real signal is connected to a real CPM correlator which demodulates its input into a real I signal and a real Q signal, separately correlates the real I signal with the odd chips of a chip code and the real Q signal with the even chips of the chip code, and combines the correlation signals into a real correlation signal. The imaginary signal is connected to an imaginary CPM correlator which demodulates its input into an imaginary I signal and an imaginary Q signal, separately correlates the imaginary I signal with the odd chips of the chip code and the imaginary Q signal with the inverse of the even chips of the chip code, and combines the correlation signals into an imaginary correlation signal. The real and imaginary correlation signals are combined into a unified correlation signal.
   














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Drawing from US Patent 5610940
Method and apparatus for noncoherent reception and correlation of a continous phase modulated signal - US Patent 5610940 Drawing
Method and apparatus for noncoherent reception and correlation of a continous phase modulated signal
Inventor     Durrant; Randolph L. (Colorado Springs, CO); Burbach; Mark (Peyton, CO)
Owner/Assignee     Omnipoint Corporation (Colorado Springs, CO)
Patent assignment
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Company News
Publication Date     March 11, 1997
Application Number     08/480,668
PAIR File History     Application Data   Transaction History
Image File Wrapper   Patent Term   Fees
Litigation
Filing Date     June 7, 1995
US Classification     375/150 375/274 375/343
Int'l Classification     H04B 001/707 H04L 027/14
Examiner     Chin; Stephen
Assistant Examiner     Gluck; Jeffrey W.
Attorney/Law Firm     Lyon & Lyon
Address
Parent Case     RELATED APPLICATION DATA This application is a continuation-in-part of copending U.S. application Ser. No. 08/304,091 entitled "Coherent and Non-Coherent CPM Correlation Method and Apparatus," filed on Sep. 9, 1994 in the name of inventors Randy Durrant and Mark Burbach.
Priority Data    
USPTO Field of Search     375/200 375/206 375/208 375/209 375/210 375/343 375/274
Patent Tags     noncoherent reception correlation a continous phase modulated signal
   
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