JPS5647153A - Digital phase modulation system - Google Patents
Digital phase modulation systemInfo
- Publication number
- JPS5647153A JPS5647153A JP12435279A JP12435279A JPS5647153A JP S5647153 A JPS5647153 A JP S5647153A JP 12435279 A JP12435279 A JP 12435279A JP 12435279 A JP12435279 A JP 12435279A JP S5647153 A JPS5647153 A JP S5647153A
- Authority
- JP
- Japan
- Prior art keywords
- input data
- phase shift
- shift information
- corresponds
- sinomegact
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
- H04L27/2003—Modulator circuits; Transmitter circuits for continuous phase modulation
- H04L27/2007—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change within each symbol period is constrained
- H04L27/2017—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change within each symbol period is constrained in which the phase changes are non-linear, e.g. generalized and Gaussian minimum shift keying, tamed frequency modulation
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
PURPOSE:To attain the narrow band of the spectrum of a modulated wave and also to keep envelepes constant by making use of relative phase information that corresponds to a combination of not less than three continuous bits of input data. CONSTITUTION:Every time one bit of input data 1 is inputted, relative phase shift information that corresponds to a combination of three continuous bits of input data is read out of memory 3 and applies to adder 6, where it is added of the final phase of absolute phase shift information, preceding by one time slot, from latch circuit 7, obtaining absolute phase shift information theta(t) that corresponds to input data. From this absolute phase shift information, a sine value and cosine value are operated and their results are converted into analog signals, which are applied to carrier suppression amplitude modulators 18 and 19, where carriers sinomegact and cosomegact are modulated. Then, their outputs are added together so as to obtain digital phase modulated wave sintheta(t) sinomegact+costheta(t)cosomegact.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12435279A JPS5647153A (en) | 1979-09-27 | 1979-09-27 | Digital phase modulation system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12435279A JPS5647153A (en) | 1979-09-27 | 1979-09-27 | Digital phase modulation system |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12026985A Division JPS615659A (en) | 1985-06-03 | 1985-06-03 | Digital phase modulating system |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5647153A true JPS5647153A (en) | 1981-04-28 |
JPS6149865B2 JPS6149865B2 (en) | 1986-10-31 |
Family
ID=14883249
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12435279A Granted JPS5647153A (en) | 1979-09-27 | 1979-09-27 | Digital phase modulation system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5647153A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0371751A2 (en) * | 1988-11-30 | 1990-06-06 | Motorola, Inc. | Digital GMSK modulator with non integer bit interval handling |
US5418819A (en) * | 1991-11-18 | 1995-05-23 | Nippon Hoso Kyokai | Transmitting apparatus and receiving apparatus based on phase modulation method |
-
1979
- 1979-09-27 JP JP12435279A patent/JPS5647153A/en active Granted
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0371751A2 (en) * | 1988-11-30 | 1990-06-06 | Motorola, Inc. | Digital GMSK modulator with non integer bit interval handling |
US5418819A (en) * | 1991-11-18 | 1995-05-23 | Nippon Hoso Kyokai | Transmitting apparatus and receiving apparatus based on phase modulation method |
Also Published As
Publication number | Publication date |
---|---|
JPS6149865B2 (en) | 1986-10-31 |
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