Source coding, channel coding and modulation techniques used in the ADTV system

1991 ◽  
Vol 37 (4) ◽  
pp. 166-169 ◽  
Author(s):  
G.A. Reitmeier ◽  
C. Basile ◽  
S.A. Keneman
Keyword(s):  
Channel Coding ◽  
Source Coding ◽  
Modulation Techniques

scholarly journals Research on Secure Debugging Interaction of Sensor Nodes Based on Visible Light Communication

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 953 ◽  
Author(s):  
Yuanchu Yin ◽  
Jiefan Qiu ◽  
Zhiqiang Li ◽  
Mingsheng Cao
Keyword(s):  
Visible Light ◽  
Channel Coding ◽  
Sensor Node ◽  
Source Coding ◽  
Visible Light Communication ◽  
Propagation Characteristic ◽  
Transmission Efficiency ◽  
Sensor Nodes ◽  
Pulse Interval ◽  
Inaccessible Area

When a wireless sensor node’s wireless communication fails after being deployed in an inaccessible area, the lost node cannot be repaired through a debugging interaction that relies on that communication. Visible light communication (VLC) as a supplement of radio wave communication can improve the transmission security at the physical layer due to its unidirectional propagation characteristic. Therefore, we implemented a VLC-based hybrid communication debugging system (HCDS) based on VLC using smartphone and sensor node. For the system’s downlink, the smartphone is taken as the VLC gateway and sends the debugging codes to the sensor node by the flashlight. To improve the transmission efficiency of the downlink, we also propose a new coding method for source coding and channel coding, respectively. For the source coding, we analyze the binary instructions and compress the operands using bitmask techniques. The average compression rate of the binary structure reaches 84.11%. For the channel coding, we optimize dual-header pulse interval (DH-PIM) and propose overlapped DH-PIM (ODH-PIM) by introducing a flashlight half-on state. The flashlight half-on state can improve the representation capability of individual symbols. For the uplink of HCDS, we use the onboard LED of the sensor node to transmit feedback debugging information to the smartphone. At the same time, we design a novel encoding format of DH-PIM to optimize uplink transmission. Experimental results show that the optimized uplink transmission time and BER are reduced by 10.71% and 22%, compared with the original DH-PIM.

scholarly journals Channel Coding and Source Coding With Increased Partial Side Information

Entropy ◽  
2017 ◽  
Vol 19 (9) ◽  
pp. 467
Author(s):  
Avihay Sadeh-Shirazi ◽  
Uria Basher ◽  
Haim Permuter
Keyword(s):  
Channel Coding ◽  
Source Coding ◽  
Side Information

scholarly journals EXIT-Chart-Aided Joint Source Coding, Channel Coding, and Modulation Design for Two-Way Relaying

2013 ◽  
Vol 62 (6) ◽  
pp. 2496-2506 ◽  
Author(s):  
Abdulah Jeza Aljohani ◽  
Soon Xin Ng ◽  
Robert G. Maunder ◽  
Lajos Hanzo
Keyword(s):  
Channel Coding ◽  
Source Coding ◽  
Exit Chart

UTILITIES AND DISTORTIONS: AN OBJECTIVE APPROACH TO POSSIBILITIES CODING

2005 ◽  
Vol 13 (02) ◽  
pp. 139-161 ◽  
Author(s):  
ANDREA SGARRO
Keyword(s):  
Channel Coding ◽  
Source Coding ◽  
Probabilistic Approach ◽  
Utility Functions ◽  
Information Coding ◽  
New Class ◽  
Objective Interpretation ◽  
Similarity Indices ◽  
Minimum Distances ◽  
The Relationship

We re-take the possibilistic (as opposed to probabilistic) approach to information coding put forward in 1,2. To enhance the possibilistic approach also outside the realm of "subjective" uncertainties, in this paper we adopt an "objective" interpretation of possibilistic source coding based on utility functions and an "objective" interpretation of possibilistic channel coding based on distortion measures and similarity indices. We stress the relationship between possibilistic coding as based on distortions between sequences and algebraic coding as based on minimum distances between codewords. We compute the operational (coding-theoretic) entropy for a new class of possibilistic sources.

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