Time-division multiplexing

The Microstrip patch antenna has a dielectric substrate with a radiating patch and the feed lines are etched on one side and a ground plane on the other side. The shape of the patch is not constrained (could be square, rectangular, circular, triangular or elliptical) and it is generally made of conducting material such as copper or gold. These antennas are mostly used at microwave frequencies, the fringing fields between the patch edge and the ground plane cause the microstrip patch antennas to radiate

subcarriers at any given time, and time division multiple access (TDMA) or frequency division multiple access (FDMA) is used to support multiple users. The major disadvantage of this static multiple access scheme is that the fact that the different users perform differently in the same given wireless channel is not being taken in consideration. OFDMA, on the other hand, allows multiple users to transmit simultaneously on the different subcarriers per OFDM symbol at any given time. Since the users perform

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 robust adaptive filters

Engineering Jaypee University of Information Technology Waknaghat, Solan (H.P.)-173234, India krt.tiwari@gmail.com, bindu.bharti457@gmail.com, davinder.saini@juit.ac.in Abstract— In this paper, performance metric of orthogonal frequency division multiplexing (OFDM) system is analyzed over a composite fading channel i.e. generalized K- fading channel. Here, OFDM system is considered which include repetition code to enhance the wireless link performance with simplicity. Symbol error rate (SER) performance

CAREER EPISODE –1 Mohd Saem (a) Introduction CE 1.1 CHRONOLOGY Project Title Design and Implementation of MIMO OFDM Dates for the Project 2012 – 2013 Duration 1 year Name of the Organization Electronics and Telecommunication Engineering Department Location New Rizvi Educational Complex, Off Carter Road, Bandra West, Mumbai, Maharashtra 400050, India My Role Project Demonstrator and project lead (b) Background CE 1.2 Rizvi

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

Performance of Space Time Block Codes(STBC) Anuj Mehta School of Electrical Engineering & Telecommunication, UNSW Sydney, Australia Z3488506@zmail.unsw.edu.au Abstract— In the following paper we are going to discuss the different coding techniques such as Orthogonal STBC , Alamouti’s coding and their performance on a QPSK signal with Rayleigh fading. We will plot it for SNR values ranging from 0dB to 40 dB. In this we will be taking different combination for number of transmitting and the radiating

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

broadcasting. 5. RESULTS Figure 7. Demonstration setup of the broadcasting system in the laboratorial environment. Fgure 8. Block diagram of the laboratorial demonstration. 6. Performance Evaluation The high-definition TV program is modulated by the time domain OFDM (TDS-OFDM), and then transmitted in the hybrid system to evaluate its performance. We use the mode (64QAM, Multi-carrier, PN420, FEC 0.6, TI 720) [30] for the first-step demo. The system bandwidth is 8 MHz located from 2 MHz to 10 MHz

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 unreliable is time varying fading. The phenomenon is described as the constructive/destructive interference between signals arriving at the same antenna via different paths, and hence with different delays and phases, resulting in random fluctuations of the signal level