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Dhawan, Divya
- Design of LDPC Encoder and Decoder for 40 Gb/s Optical Communication Systems
Authors
1 PEC University of Technology, Sector-12, Chandigarh, IN
Source
Networking and Communication Engineering, Vol 4, No 7 (2012), Pagination: 393-396Abstract
This paper presents a design approach for low-density parity-check (LDPC) encoder and decoder for applications in optical communication systems at 40 Gb/s. In order to get the best performance, the system is further optimized for the powers of the EDFA (Erbium Doped Fiber Amplifier) amplifiers used with the SMF (Single Mode Fiber) and DCF (Dispersion Compensating Fiber) fibers to achieve the highest Q factor. The designed LDPC coded system (using LDPC codes of r=0.8 for coding and sum-product algorithm (SPA) for decoding) is compared with the uncoded system at bit rate of 40 Gb/s and seen to provide significant performance improvement in terms of the BER. LDPC codes also provide near-capacity performance and significant system enhancement with respect to the state-of-the-art FEC (Forward Error Correction) schemes. High coding gains and their inherent low complexity of both the encoder and decoder have made them an attractive and viable choice for high-speed optical communication.
Keywords
Forward Error Correction (FEC), Low Density Parity Check (LDPC) Codes, Sum Product Algorithm (SPA).- Performance Improvement of Triple Play Services in FTTH/BPON Using OFDM
Authors
1 Department of Electronics and Electrical Communication Engineering, PEC University of Technology, Chandigarh, IN
2 Department of Electronics and Electrical Communication Engineering, PEC University of Technology, Chandigarh, IN
3 Punjab Engineering College, Chandigarh, IN
Source
Networking and Communication Engineering, Vol 3, No 8 (2011), Pagination: 538-543Abstract
Next generation services of triple play (data/voice/video) require far more bandwidth than prevailing technologies like dial-up, Integrated Services for Digital Network (ISDN), cable, Digital Subscriber Line (DSL) could offer. The bay between the access and metro networks is broadening due to bandwidth difference. This problem is termed as “access bottleneck”. The challenge is to distribute triple play services efficiently and cost effectively. Passive optical network has addressed these challenges in a most auspicious manner. This paper presents an architecture supporting triple play services. It employs Broadband Passive Optical Network (BPON) within last mile to address the access bottleneck issue. It uses orthogonal frequency division multiplexing (OFDM) for transmission of voice, video and data service. Performance analysis of our proposed architecture using simulation technique shows that the signal power received at the farthest Optical Network Unit (ONU) after passing through a distance of 25km is -25dBm with a satisfactory bit error rate (BER) of 10-3 and a Signal to Noise Ratio for video service, indicating good and clear picture quality. Proposed method not only accomplishes the desired requirement for availing services of data/voice/video (triple play) but also achieves its objective cost effectively.Keywords
Broadband Passive Optical Network (BPON), Fiber to the Home (FTTH), Orthogonal Frequency Division Multiplexing (OFDM), PON (Passive Optical Network), Triple Play.- Performance Analysis of Pseudo-Orthogonal Codes at 10 Gbps for 16 Users in Free Space
Authors
1 Electronics and Electrical Communication (E&EC) Department, PEC University of Technology, Chandigarh, IN
2 Electronics and Electrical Communication (E&EC) Department, PEC University of Technology, Chandigarh, IN