scholarly journals A Novel Subcarrier Allocation Algorithm for MC–CDMA Systems

2016 ◽  
Vol 67 (5) ◽  
pp. 371-376 ◽  
Author(s):  
Muhammet Nuri Seyman ◽  
Bircan Saçakli
Keyword(s):  
Performance Improvement ◽  
Bit Error Rate ◽  
Error Rate ◽  
System Performance ◽  
High Speed ◽  
Subcarrier Allocation ◽  
Efficient Allocation ◽  
Data Rates ◽  
Modulation Techniques ◽  
Cdma Systems

Abstract Multi carrier modulation techniques such as MC-CDMA are used in high-speed communication applications. Due to MC-CDMA being a multiuser in technology, the subcarrier quantity allocated per user decreases in case the quantity of active users increases. Consequently, data rates per user are reduced with the increase in the bit error rate (BER). Efficient allocation of subcarriers to users within the system can aid the overcoming of this problem. This study develops a new algorithm for subcarrier allocation and system performance improvement in terms of BER, and data rates in comparison to other algorithms were ensured.

RELIABILITY OF ERROR CORRECTING CODES ON WIRELESS INFORMATION NETWORKS

1996 ◽  
Vol 03 (04) ◽  
pp. 283-304
Author(s):  
MARTIN L. SHOOMAN ◽  
FRANK A. CASSARA
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
System Performance ◽  
Communication Systems ◽  
System Analysis ◽  
Error Correcting Codes ◽  
Information Networks ◽  
Coding Scheme ◽  
Data Rates ◽  
Study Results

Error correcting codes are well known techniques for improving bit error rate (BER) performance in digital communication systems and are particularly important in wireless information networks to help establish reliable communication links. This paper examines the effect of coder/decoder circuitry failures on the overall communication system performance. A system analysis of the error correction coding scheme performance must include an evaluation of the reliability of the coder/decoder circuitry because their failures also serve as a source of undetected errors. The parity bit code, Hamming single error correcting and detecting code, and the Reed–Solomon code are included in the study. Results reveal that for applications as described in the text that require low bit error rate and operate at low data rates, the reliability of the coding circuitry can play a significant role in determining overall system performance. In fact, for such error and data rates, a simpler coding scheme with higher circuit reliability may actually be more beneficial than a more complex coding scheme with enhanced error correcting ability but with a higher chip failure rate.

Terrestrial Free Space Optic Propagation Analysis Considering Malaysia Weather Condition

2012 ◽  
Author(s):  
Wan Rizal Hazman Wan Ruslan ◽  
Sevia Mahdaliza Idrus ◽  
Arnidza Ramli ◽  
Norhafizah Ramli ◽  
Abu Sahmah Mohd Supa’at ◽  
...  
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Free Space ◽  
Weather Condition ◽  
Q Factor ◽  
Performance Characterization ◽  
Space Optics ◽  
Terrestrial System ◽  
Data Rates ◽  
Free Space Optic

Pemantulan cahaya matahari oleh cermin atau dikenali sebagai heliograf adalah kaedah awal komunikasi optik wayarles (OWC). Sewajarnya, sistem komunikasi moden mendedahkan kadar data yang tinggi di samping kualiti perkhidmatan yang lebih baik berbanding kaedah terdahulu. Sistem komunikasi optic wayarles mempunyai banyak kebaikan dimana ia adalah penting untuk sistem daratan, sebagai contoh penggunaan Optik Ruang Bebas (FSO) di kawasan luar. Di dalam kertas kerja ini, gambaran dan pencirian prestasi sistem Optik Ruang Bebas seperti pelemahan, kadar bit kesalahan (BER), faktor Q dan jenis pengesan yang berguna untuk pengesanan dalam sistem FSO dibentangkan. Sistem telah direkabentuk dan disimulasi untuk perincian prestasi dengan mengambil kira kawasan Subang. Kata kunci: Pelemahan; kadar bit kesalahan; pengesan foto; faktor Q; sistem daratan The reflection of sunlight by mirrors or known as the heliograph is an early method of optical wireless communication (OWC). Naturally, modern communication system reveals much higher data rates with better quality of service (QoS) compared to those ancient methods. There are many advantages of OWC which are important for a terrestrial system for example the usage of an outdoor free space optics (FSO) system. In this paper, a description and system performance characterization of the FSO such as attenuation, bit error rate (BER), Q factor and the type of detectors that are highly useful for detection in FSO systems are presented. The system are designed and simulated for performance characterization considering Subang terrestrial. Key words: bit error rate; photodetector; Q factor; terrestrial system

Performance Analysis of High Data Rate Wavelength Division Multiplexed Passive Optical Networks (WDM-PON) for Mobile Backhaul Application

Frequenz ◽  
2018 ◽  
Vol 72 (11-12) ◽  
pp. 561-573 ◽  
Author(s):  
Vivek Kachhatiya ◽  
Shanthi Prince
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Discrete Data ◽  
Data Rate ◽  
Passive Optical Network ◽  
Wavelength Division ◽  
Wavelength Division Multiplexed ◽  
Data Rates ◽  
Mobile Backhaul ◽  
Wdm Pon

Abstract In this work, we propose a sixteen channel wavelength division multiplexed passive optical network (WDM-PON) architecture which provides seamless connectivity between mobile switching center (MSC) and base transceiver stations (BTS) and also serves the fiber to the home (FTTH) users. WDM-PON based mobile backhaul network is considered to be a prime solution due to its quick deployment and reduced cost. Due to growing demand for connectivity and data transmission, the number of wavelengths are increasing day by day. The bit error rate (BER) performance is analyzed for the discrete data rates per wavelength (viz. 2.5 Gbps, 5 Gbps, 10 Gbps, 20 Gbps, and 40 Gbps) at discrete reach for 16 channel WDM-PON. The optical spectrum of sixteen channel WDM-PON is observed for different data rates at multiplexer output and the same is analyzed after fiber distance of 20 km. The fiber reach of the WDM-PON is varied, and its effect on the performance parameter like bit error rate (BER) and Quality Factor (Q-Factor) is observed on BER analyzer for the discrete data rates per wavelength. It is found that as data rate per wavelength increases, the error-free reach of the WDM-PON system decreases. Proposed WDM-PON architecture performs superior to the compared work under similar initial conditions.

scholarly journals Bit-Error-Rate Analysis of Raptor Codes over Rician Fading Channels

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Jingke Dai
Keyword(s):  
Fading Channels ◽  
Bit Error Rate ◽  
Error Rate ◽  
System Performance ◽  
Gaussian Approximation ◽  
Rician Fading ◽  
Raptor Codes ◽  
Erasure Channels ◽  
Rate Analysis ◽  
Rician Fading Channels

The bit-error-rate expressions of nonsystematic Raptor (NR) codes and systematic Raptor (SR) codes over Rician fading channels are first derived using a Gaussian approximation (GA) approach. These BER expressions provide a significant reduction in computational complexity for analyzing system performance when compared with simulation and discretized density evolution (DDE). As shown by the asymptotic analysis, the NR codes originally designed for binary erasure channels still have good performance on Rician fading channels but SR codes do not. Therefore, the degree distributions of SR codes are specifically optimized on Rician channels which are superior to the existing SR codes and comparable to NR codes.

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