Orthogonal polynomials

techniques have been proposed for high data rate transmission. Multicarrier techniques divide the whole bandwidth into large number of narrow band orthogonal subcarriers [1, 2]. Thus the signal bandwidth becomes very less compared with coherence bandwidth ensuring no ISI in time domain and flat fading in frequency domain. Multicarrier systems such as Orthogonal Frequency Division Multiplexing (OFDM) and Multi Carrier Code Division Multiple Access (MC-CDMA) were considered to be the best technologies for

5.1 OFDM-IDMA Scheme Various multiple access technique like TDMA, CDMA, FDMA has been used in wireless network for communication. But OFDM i.e orthogonal frequency division multiple access offers number of advantages over these multiple access techniques, such as this scheme can provide simple treatment against ISI and also reduces cross cell interference. The IDMA in combination with OFDM allow effective and simple turbo type iterative MUD algorithm which can be easily implemented to large number

Chapter 5 Design and FPGA Implementation of OFDM Synchronization The channel estimation technique proposed in Chapter 4 is based on the assumption that the coherent reception is perfect. That is, the system synchronization is perfectly implemented. Synchronization is one of the most challenging and important tasks to any receiver using coherent modulation, especially for OFDM systems which are highly sensitive to synchronization errors. This chapter proposes a synchronizer based upon the delay

4. DESIGN METHODOLOGY Fig. 5. Block diagram of “PLC to VLC” module. Fig. 6. System models of the different indoor broadcasting schemes based on PLC and VLC. (a) Classical VLC-based broadcasting scheme (Scheme A). (b) Classical PLC and VLC-based broadcasting scheme (Scheme B). (c) Proposed deeply integrated PLC and VLC system for indoor broadcasting. 5. RESULTS Figure 7. Demonstration setup of the broadcasting system in the laboratorial environment. Fgure 8. Block diagram of the laboratorial

A fine-grained Indoor Localization using Multidimensional WiFi Fingerprinting Abstract—Although fingerprint based localization is promising for indoor applications, its accuracy remains a huge challenge. Most existing approaches depends on the Radio Signal Strength (RSS) to generate fingerprints. Merely using RSS is unable to accurately localize since such an one-dimensional fingerprint is serious influenced by the interference and multipath effect in the indoor environment. In this paper, we propose

Orthogonal Frequency Division Multiplexing or OFDM is a modulation format that is being used for many of the latest wireless and telecommunications standards. OFDM has been adopted in the Wi-Fi arena where the standards like 802.11a, 802.11n, 802.11ac and more. It has also been chosen for the cellular telecommunications standard LTE / LTE-A, and in addition to this it has been adopted by other standards such as WiMAX and many more. Orthogonal frequency division multiplexing has also been adopted

RAKE RECEIVER METHOD OF MULTIPATH FADING REDUCTION S.D Dayo1, K.O Egbo2, 1Department of Electrical and Electronics Engineering Ladoke Akintola University of Technology, Ogbomosho. 2 Department of Physics, Federal University of Technology, Owerri, Imo State ABSTRACT Wireless communications is, by any measure, the fastest growing segment of the communications industry. It has captured the attention of the media and the imagination of the public. However, the fundamental phenomenon which makes transmission

speed application are growing at a faster rate and with the minimum tolerance of error. To enhance available bandwidth and improve the quality of transmission convolution codes are used on the OFDM (Orthogonal frequency division multiplexing) communication system over AWGN channel. In OFDM (Orthogonal frequency division multiplexing) systems with channel equalization play a key role in overcoming distortions caused by phenomena like fading, delay spread and multipath effects. A new framework for designing

These sub-carriers are orthogonal to each other. It is very much popular scheme used in digital television, audio broadcasting and 4G communications. OFDM has the ability to deal with severe channel fading conditions without complex equalization filters. Due to the longer symbol

as parallel transmission as each sub-carrier has narrow bandwidth in comparison to overall bandwidth of signal. Hence it converts a frequency selective fading channel into several nearly flat fading channels. High Spectral Efficiency:- Due to orthogonal nature of each sub-carrier, large number of subcarriers can be accommodate over a very narrow spectral region thus it increases the spectral