Communication apparatus for continuous phase modulation signal

• US 8,731,032 B2
• Filed: 10/11/2011
• Issued: 05/20/2014
• Est. Priority Date: 10/12/2010
• Status: Expired due to Fees

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Kim, Pan-Soo, Lee, Yong-Ho, Oh, Deock-Gil, Giraud, Xavier
• Primary Examiner(s): Fan, Chieh M
• Assistant Examiner(s): Hassan, Sarah
• Application Number:
  US13/270,763
• Publication Number:
  US 20120087403A1
• Time in Patent Office: 952 Days
• Field of Search: 375/222, 375/334, 342/174
• US Class Current: 375/222
• CPC Class Codes: H04L 2027/0067 Phase error detectors
• CPC Class Codes: H04L 27/2003 for continuous phase modulation frequency shift keying H04L27/10
• CPC Class Codes: H04L 27/227 using coherent demodulation

Abstract

A communication apparatus for a continuous phase modulation signal. The communication apparatus includes a first processing unit configured to generate first information of the continuous phase modulation signal using first symbol data; a symbol converting unit configured to convert the first symbol data into second symbol data or convert the second symbol data into the first symbol data; a symbol storage unit configured to store the second symbol data; a second processing unit configured to second information of the continuous phase modulation signal using the second symbol data stored in the symbol storage unit; a third processing unit configured to generate third information of the continuous phase modulation signal using a modulo operation of an integer related to a modulation index; and an output unit configured to add an output from the third processing unit and an output from the first processing unit and generate the continuous phase modulation signal.

Claims

1. A communication apparatus for a continuous phase modulation signal, comprising:

a first processing unit configured to generate first information of the continuous phase modulation signal using first symbol data;

a symbol converting unit configured to convert the first symbol data into second symbol data or convert the second symbol data into the first symbol data;

a symbol storage unit configured to store the second symbol data;

a second processing unit configured to generate second information of the continuous phase modulation signal using the second symbol data stored in the symbol storage unit;

a third processing unit configured to generate third information of the continuous phase modulation signal using the second information and a modulo operation of an integer related to a modulation index; and

an output unit configured to add an output from the third processing unit and an output is from the first processing unit and generate the continuous phase modulation signal.

2. The communication apparatus of claim 1, wherein the first processing unit is further configured to convolute the first symbol data and a phase pulse to generate the first information.

3. The communication apparatus of claim 1, wherein the second processing unit is further configured to generate the second information using pieces of the second symbol data stored in the symbol storage unit other than the latest L pieces of second symbol data.

4. The communication apparatus of claim 1, wherein the third processing unit is further configured to operate at a symbol rate that is a positive integer.

5. The communication apparatus of claim 1, wherein the third processing unit is further configured to be connected to an end of the second processing unit.

6. The communication apparatus of claim 1, wherein the second symbol data is unsigned integer type data.

7. The communication apparatus of claim 1, wherein the first information corresponds to a correlative state of the continuous phase modulation signal, the second information corresponds to a phase state of the continuous phase modulation signal, and the third information corresponds to a phase tilt or phase offset of the continuous phase modulation signal.

8. The communication apparatus of claim 1, further comprising:

a trellis termination unit configured to generate a trellis termination symbol using a modulo operation with respect to an interim calculation result of the second processing unit.

9. The communication apparatus of claim 8, wherein the trellis termination unit is further configured to comprise

an adder configured to add an output from the symbol storage unit and the interim calculation result of the second processing unit, and

a modulo operator configured to perform a modulo operation on an output from the adder.

10. The communication apparatus of claim 1, wherein a burst structure of the continuous phase modulation signal consists of a preamble, a first data symbol, a midamble, and a second data symbol.

11. The communication apparatus of claim 10, wherein a trellis termination symbol is inserted between the first data symbol and the midamble, or at an end of the second data symbol.