Wireless Communication

Bhanisha Verma ¹, Maninder Singh ², Priyanka Nian ³, Prabhjot Kaur ³, Sandeep Sachdeva ²

Affiliations
1 Electronics & Communication Engineering, Maharishi Markandeshwar University, Mullana, Ambala, Haryana, IN
2 Department of Electronics and Communication Engineering, Haryana Engineering College, Jagadhri, Haryana, IN
3 Department of Electronics & Communication Engineering, Maharishi Markandeshwar University, Mullana, Ambala, Haryana, IN

Abstract

Worldwide Interoperability for Microwave Access (WiMAX) is one of the most developing technology in modern wireless communication system for providing voice, data, video and multimedia services on mobile phones at high speeds, cheap rate & unwired transmission. The physical layer of WiMax emphasis on Orthogonal Frequency Division Multiplexing (OFDM) signals. OFDM is a parallel transmission scheme, where a high – rate serial data stream is split up into a set of low – rate sub streams, each of which is modulated on a separate subcarrier. Increasing the number of parallel transmission reduces the data rate that each individual carrier must convey and that lengthens the symbol period. However, in OFDM, no frequency diversity is exploited to improve Bit Error Rate (BER) performance. Today’s OFDM systems attempt to overcome this limitation by application of channel coding and interleaving, which requires a reduction in throughput. OFDM uses different type of modulation and encoding schemes to improve BER performance. In this paper we study WiMax with OFDM transmission system and compared WiMax system by using different modulation schemes such as QAM and QPSK modulation and encoding schemes such as CRC and RS encoding schemes over multi-path fading channels at the cost of small increase in complexity.

Keywords

CRC Encoding, OFDM, RS Encoding, Wimax.

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Maninder Singh ¹, Prabhjot Kaur ², Sandeep Sachdeva ¹

Affiliations
1 Department of Electronics and Communication Engineering, Haryana Engineering College, Jagadhri, Haryana, IN
2 Department of Electronics and Communication Engineering, M. M. University, Mullana, Haryana, IN

Abstract

Prior to the recent industry boom, the most common Ultra – Wide Band (UWB) system implementation is impulse radio, where ultra-short baseband pulses are used with a variety of modulation schemes to transfer data. Impulse radio has various advantages over OFDM, with its ability to penetrate through materials and resolve multipath with path length differences on the order of a foot or less. In present communication systems, increasing the number of users reduces the data rate that each individual carrier must convey and that lengthens the symbol period. However, in UWB, no frequency diversity is exploited to improve BER performance. Today’s UWB systems attempt to overcome this limitation by application of channel coding and interleaving, which requires a reduction in throughput. UWB uses different type of modulation schemes to improve BER performance. In this paper we analyze the performance of UWB system over multi-path fading channels at the cost of small increase in complexity.

Keywords

BER, CRC Encoding, RS Encoding and UWB System.

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