منابع مشابه
Channel Coding Techniques for Adaptive Multi Rate Speech Transmission
A variable channel coding scheme for Adaptive Multi Rate (AMR) speech transmission over mobile radio channels is proposed. Although it was developed for the GSM (Global System for Mobile Communications), the basic concept of variable channel coding can be adopted to other digital radio systems. The new AMR concept allows almost wire-line speech quality even for poor channel conditions by dynami...
متن کاملAdaptive-rate image compression for wireless digital data transmission systems
The vast amount of data needed to represent digital imagery motivates the use of advanced compression systems to reduce the bandwidth required to transmit high-resolution source imagery. We propose two methods to provide optimal image quality at a fixed image delivery rate. The first method, channel-controlled variable-rate (CCVR) image coding, operates within the constraint that the modulation...
متن کاملForward Pumping Based Fiber Optical Raman Amplifiers in Different Optical Fiber Transmission Medium Systems
This paper has presented the transmission systems with employing Raman amplifier technology in forward pumping directions in order to have put up with much higher level of design complexities, when compared to conventional transmission lines with doped fiber optical amplifier. Even for the construction of a fundamental, basic building block a unit of a fiber Raman amplifier (FRA), the designer ...
متن کاملError Control Coding in Optical Fiber Communication Systems: An Overview
In sending data from one point to another, such as transferring data between various components of a computer system, due to the existence of electromagnetic waves and other issues such as noise and attenuation, information may be changed in the middle of the track. Therefore, it is critical for receiver to ensure the accuracy of the information. For this reason, error control coding plays an i...
متن کاملCoherent Optical Transmission Systems : Performance and Coding Aspects
Since the invention of fiber-optic systems in the 1970s, user demand has driven innovation forward, and each new generation of products has achieved higher data rates than its predecessor. Today, the most promising approach for further increasing data rates is coherent transmission with multi-level modulation and digital signal processing (DSP). By using multi-level modulation, data rates can b...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Lightwave Technology
سال: 2011
ISSN: 0733-8724,1558-2213
DOI: 10.1109/jlt.2010.2099208