Design of OFDM with interpolated FIR Filter channel estimation based Fixed WIMAX System for Data and Image Transmission

The growth in the today’s wireless communication has lend the demand of highly quality of service (QoS) in transmission. The existing telecommunication industries are providing the transmission with the speed of Kbps to Mbps while most of the industries are failed to better QoS. The significant technique called Orthogonal Frequency Division Multiplexing (OFDM) provides the better QoS but leads to high Cyclic Prefix (CP). The WIMAX (Worldwide Interoperability for Microwave Access) is a broadband wireless access technology that adopts the OFDM. This paper introduces OFDM based WIMAX system performance analysis using CP. The Simulink model is designed with 16 Quadrature Amplitude Modulation (QAM) with CP using MATLAB. The QAM scheme was examined for Bit Error Rate (BER) over Additive White Gaussian Noise (AWGN) channel and multipath Rayleigh fading channel that is subjected to the CP. The proposed OFDM system proved to possess a better BER for without fading channels. The OFDM data/image transmission includes AWGN and Rayleigh with different cyclic prefix values1/4, 1/8 and 1/16 is plotted. The Cyclic prefix values are changing accordingly for transmitter and receiver. When Eb/No is 22db, the BER value 6.8e-5, 5.6e-5 and 5.8e-5 generated, for 1/4, 1/8 and 1/16 different cyclic prefix values respectively. Similarly, for image transmission proposed design achieves 19.94dB of PSNR value for SNR value of 7dB with respect to code rate ½ with 16-QAM

Electrically Compact SRR-Loaded Metamaterial Inspired Quad Band Antenna for Bluetooth/WiFi/WLAN/WiMAX System

In this paper, we reveal a concept of low-profile Split Ring Resonator loaded metamaterial inspired antenna for Bluetooth/WiFi/WLAN/WiMAX communication systems. The antenna’s overall dimensions are 30 × 31 mm2 where two metamaterial unit cells are placed parallel to each other and a zig-zag feed line is connected with the SubMiniature version A connector. The defected ground technique was used to improve the antenna’s operational bandwidth. The computer simulation technology Microwave Studio was used to design and perform the numerical investigation, and the antenna was fabricated on FR-4 dielectric material. The Agilent N5227A VNA and anechoic chamber-based Satimo Star Lab were used to measure the antenna’s scattering parameters, voltage standing wave ratio, gain, efficiency and radiation patterns. The proposed metamaterial antenna had 200 MHz (2.40–2.60 GHz) and 390 MHz (3.40–3.79 GHz) overall bandwidth, which are similar to the simulated data. The measured results were applicable for Bluetooth (2.40–2.485 GHz), WiFi (2.4 GHz), WLAN (2.40–2.49 GHz and 3.65–3.69 GHz), and WiMAX (3.40–3.79 GHz) applications. The antenna’s average gain was 1.50 dBi, with the maximum and minimum gains of 2.25 dBi and 0.88 dBi, respectively, in addition to omnidirectional radiation patterns at operating bands.