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The errors caused in the wireless communication channel are very important to identify and rectify. Viterbi Decoder is very commonly implemented technique among the various error detection and correction (EDAC) techniques. A high data-rate convolutional code suffers from decrease in the performance of bit-error-rate due to inherent drifting error between the estimated and the accurate path matric and the optimal path matric calculation during the trellis generation. The design performance is highly dependent on many factors like availability of memory elements, decoding latency of the circuit, overhead bits in the algorithm, etc. In this paper, we propose a design of Convolutional Viterbi Rate-1/3 Encoder and Decoder for a wireless communication system based on IEEE 802.11n Draft. The proposed work focuses on high data rate decoder design and simulation. The transmitter encoder and the receiver decoder are designed and simulated as separate designs for functionality verification. The purpose is to determine the feasibility to design data Error Detection And Correction (EDAC) decoder for a wireless system with multiple input multiple output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM). Viterbi Encoder/Decoder combination is very effectively used in high data rate communication systems because of its EDAC feature. The operational concept of viterbi encoding and decoding is based on Trellis coded modulation and de-modulation.

Antenna plays an important role in most of the RF and microwave applications. Intensifying applications of wireless communications now a day’s persist to challenge RF or microwave Antenna with ever more meticulous requirements- smaller size, lighter weight, high performance, economical and easy for fabrication. The advancement in the modern materials fabrication technologies  and different research on novel materials, including monolithic microwave integrated circuits (MMIC), low-temperature cofired ceramics (LTCC), high-temperature superconductors (HTS), micro electro mechanic system (MEMS), and micromachining technology, have encouraged the fast strengthening of latest microstrip and supplementary Antenna for RF and microwave applications. The manuscript presented here is a representation of the H shape patch antenna design and effect of coupling of parasitic patch and discontinuities in radiating structure in order to achieve high gain and better bandwidth (-10 dB).  A mathematical model is presented which has been established on the basis of result obtained. The working frequency range of the manuscript is from 1 GHz to 20 GHz.

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