Unlock instant, AI-driven research and patent intelligence for your innovation.

Full response 8CPFSK 90 degree invariable rotary TCM coding modulation/demodulation method and its device

An 8CPFSK, rotation-invariant technology, applied in digital transmission systems, electrical components, error prevention, etc., can solve problems such as phase ambiguity at different angles, system performance deterioration, system performance degradation, etc., to achieve low resource consumption, avoid performance loss, The effect of strong robustness

Inactive Publication Date: 2007-10-24
ZHEJIANG UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a circuit has been described, for example, in the following textbook: John G. Proakis Digital Communications (Four Edition), but in the actual TCM transmission system, if the receiving end adopts coherent demodulation, due to some inherent defects of the carrier extraction method , will produce phase ambiguity at different angles, which will significantly degrade the system performance
Especially when there is a carrier frequency deviation between the receiving end and the sending end, the impact is more serious. Under the condition of high SNR, the error rate can be controlled by phase loop tracking, but at a lower SNR Under the condition of , it may cause error propagation and cause the system performance to deteriorate sharply, so it is very necessary to propose a coded modulation and demodulation method that can overcome the phase ambiguity

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Full response 8CPFSK 90 degree invariable rotary TCM coding modulation/demodulation method and its device
  • Full response 8CPFSK 90 degree invariable rotary TCM coding modulation/demodulation method and its device
  • Full response 8CPFSK 90 degree invariable rotary TCM coding modulation/demodulation method and its device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0038] The invention realizes the 90-degree rotation-invariant TCM coding modem of full response 8CPFSK.

[0039] The CPM signal is characterized by a pulse q(t), or the corresponding shaped pulse g(t), and the relationship between the two is as follows:

[0040] q ( t ) = ∫ - ∞ t g ( u ) du

[0041] Typically, g(t) is time-limited to a certain interval (0, LT). In addition, it is normalized on q(t):

[0042] q(∞)=1 / 2

[0043] The present invention only discusses full-response CPM, so L is 1, and g(t) is taken as 1RC molding in this example, namely:

[0044]

[0045] And the modulation index h=1 / 8, using the above information, according to Z k The transmitted 8CPFSK signal can then be determined.

[0046] Referring now to FIG. 1, there is shown a bloc...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a full-response 8CPFSK 90deg rotation invariable TCM code modulation and demodulation method, wherein the TCM technology increases system reliability in theory; in real TCM system, the coherent demodulation on receive end can decrease system performance. This invention designs grid coder to make the received signal 90dge phase blur affect no the signal normal demodulation, avoids performance loss, requires lee resource, and improves system robustness.

Description

technical field [0001] The invention relates to the field of digital communication, in particular to a 90-degree rotation-invariant TCM coding modem method and device thereof with full response to 8CPFSK. Background technique [0002] TCM is a technology that combines modulation and coding. It improves the reliability of the digital transmission system without increasing the transmission power and the system transmission bandwidth. Such a circuit has been described, for example, in the following textbook: John G. Proakis Digital Communications (Four Edition), but in the actual TCM transmission system, if the receiving end adopts coherent demodulation, due to some inherent defects of the carrier extraction method , will produce phase ambiguity at different angles, which will significantly degrade the system performance. Especially when there is a carrier frequency deviation between the receiving end and the sending end, the impact is more serious. Under the condition of high...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L27/38
Inventor 赵民建金晓东王志雄
Owner ZHEJIANG UNIV