RS CODED OFDM BY UNIQUE WORD PREFIX
Journal Title: International Journal of Innovative Research in Computer Science and Technology - Year 2014, Vol 2, Issue 1
Abstract
— We expand our recently introduced concept of unique word orthogonal frequency division multiplexing (UW-OFDM). In UW-OFDM the cyclic prefixes (CPs) are replaced by deterministic sequences, the so-called unique words (UWs). The UWs are generated by appropriately loading a set of redundant subcarriers. By that a systematic complex number Reed–Solomon (RS) code construction is introduced in a quite natural way, because an RS code may be defined as the set of vectors, for which a block of successive zeros occurs in the other domain w.r.t. a discrete Fourier transform. (For a fixed block different to zero, i.e., a UW, a coset code of an RS code is generated.)A remaining problem in the original systematic coded UW-OFDM concept is the fact that the redundant subcarrier symbols disproportionately contribute to the mean OFDM symbol energy. In this paper we introduce the concept of non-systematic coded UW-OFDM, where the redundancy is no longer allocated to dedicated subcarriers, but distributed over all subcarriers. We derive optimum complex valued code generator matrices matched to the best linear unbiased estimator (BLUE) and to the linear minimum mean square error (LMMSE) data estimator, respectively. With the help of simulations we highlight the advantageous spectral properties and the superior bit error ratio (BER) performance of non-systematic coded UW-OFDM compared to systematic coded UW-OFDM and to CP-OFDM in additive white Gaussian noise (AWGN ) as well as in frequency selective environments
Authors and Affiliations
Mr. Nilesh B. B. Patil, Prof. Pragnesh Shah
Keywords
Related Articles
- EP ID EP749455
- DOI -
- Views 93
- Downloads 0
An Review of World Lavender Oil Markets and Lessons for Turkey
Lavender farms have lately grown in popularity in Turkey. Lavender farming is becoming more popular as a source of essential oils and rural tourism, which raises a slew of concerns about production and marketing. Turkey...
The Communication by Means of the Optical Fiber
A fiber optics is a transparent, flexible fabric made of plastic or glass with a diameter slightly bigger than human hair. It's mostly used to transmit light from one fiber end to the other. This kind of transmission is...
Srinagar City Road Accident and Safety Analysis
Road accidents, which kill countless people worldwide, are one of the greatest man-made disasters we face today in the world of current revenue sources. Road accidents are still a significant barrier to sustainable human...
Date Palm Crop Yield Estimation- A Framework
Saudi Arabia is the home land of the date palm tree and the dates are considered to be one of the most important national products. As the dates are part of their heritage, therefore, Saudi Arabia is the largest consumer...
Anonymization Techniques for Privacy Preservation of published Data
In today’s world data is collected for various purposes. The collected data includes personal details or some other confidential information. Database is a collection of data that can be accessed, updated and it enables...