VOLUME 8, ISSUE 2, FEBRUARY 2020

Abstract: DVB-T is the most widely used standard for interactive television. DVB-T uses the MPEG-2 standard for coding the data, as well as Forward Error Coding, Reed Solomon Coding and Convolutional coding to make the signal robust against the high amount of error that comes with transmission. It also uses QPSK to modulate the signal, which makes the information be encoded in the phase instead of the amplitude, which also helps with making the signal robust enough for the channel. But due to increase in number of users and changing needs of users in the field of communications and entertainment, there are new challenges that the currents standards are not able to satisfy. So as the number of users increases the system complexity and interference also increases. The communication channel is not free from the effects of channel impairments such as noise, interference and fading. These channel impairments caused signal distortion and signal to Ratio (SNR) degradation. This problem can be overcome by implementing the system with different modulation and error detection and correction schemes. So first design a DVB-T system with convolutional coding and OFDM transmitter. Then analyze this system with different modulation schemes such as 64-QAM and QPSK modulation and find the best suited modulation scheme with lowest bit error rate. Then again analyze this system with different error detection and correction schemes such as Reed-Solomon (RS) encoding and Cyclic Redundancy Check (CRC) encoding to reduce the bit error rate and improves the performance of system.

Keywords: DVB-T, OFDM, BER, RS

Abstract: CDMA (Code Division Multiple Access) is one of the most developing technology in modern mobile communication. It has gained widespread international acceptance by cellular radio system operators as an upgrade that will dramatically increase both their system capacity and the service quality. The core principle of spread spectrum is the use of noise-like carrier waves, and, as the name implies, bandwidths much wider than that required for simple point-to-point communication at the same data rate. Most third-generation mobile communication systems are using CDMA as their modulation technique. In CDMA interleaving is used for multiplexing of several input data over shared media. In CDMA system different type of interleaving schemes are used. In this paper we analyze the performance of these interleaving schemes in multipath fading and Additive White Gaussian Noise (AWGN) channels. We conclude that different interleaving schemes has different data rates and bit error rate.

Keyword: CDMA, System Model of CDMA, Interleaving, BER

Abstract: IDMA (Interleaved Division Multiple Access) is one of the most developing technology in modern mobile communication. It has gained widespread international acceptance by cellular radio system operators as an upgrade that will dramatically increase both their system capacity and the service quality. The core principle of spread spectrum is the use of noise-like carrier waves, and, as the name implies, bandwidths much wider than that required for simple point-to-point communication at the same data rate. Most third-generation mobile communication systems are using CDMA as their modulation technique. In CDMA interleaving is used for multiplexing of several input data over shared media. In CDMA system different type of interleaving schemes are used. In this paper we analyze the performance of these interleaving schemes in multipath fading and Additive White Gaussian Noise (AWGN) channels. We conclude that different interleaving schemes has different data rates and bit error rate.

Keyword: CDMA, System Model of CDMA, Interleaving, BER

Abstract: OFDM (Orthogonal Frequency Division Multiplexing) is a most frequently developing technology in modern mobile communication. 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 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 schemes to improve BER performance. In this paper we compared OFDM system by using 4-QAM, 16-QAM, 64-QAM and QPSK modulation schemes over multi-path fading channels at the cost of small increase in complexity.

Keywords: OFDM, BER, Parallel to Serial, Serial to Parallel Converter

Abstract: OFDM is one of the most developing technologies in modern mobile communication. 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. 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. Hence, a performance comparison of OFDM system in multipath fading and additive white Gaussian noise channels is presented. The comparison proceeds in two steps. First, design simple OFDM system. Second, a binary modulating signal is transmitted over the system and the bit error rate in multipath fading and additive white Gaussian noise channels is observed. Then first compare the performance of different modulation schemes such as Quadrature Amplitude Modulation and Quadrature Phase Shift Keying with these systems and get the best modulation schemes with less BER. Then with the combination of modulation schemes analyze the different encoding schemes such as Cyclic Redundancy Code and Reed – Solomon encoding with these systems. After that redesign the OFDM system with best encoding and modulation schemes.

Keywords: OFDM, BER, CRC, RS

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 over multi-path fading channels at the cost of small increase in complexity.

Keywords: WiMAX, OFDM, BER

Abstract: Worldwide Interoperability for Microwave Access (WiMAX) emerged with an aim of providing voice, data, video and multimedia services on mobile phones at high speeds and cheap rates. For this we study system architecture, radio aspects of the air interface (such as frequency band, radio access modes, multiple access technologies, multiple antenna technologies and modulation), mobility and Quality of Service (QoS). For this we need to discuss various modulation schemes such as Quadrature Amplitude Modulation, Quadrature Phase Shift Keying, encoding methods such as RS, CRC, Convolution and OFDM that are vital for performance of WiMax system. Then first compare the performance of different modulation schemes such as Quadrature Amplitude Modulation and Quadrature Phase Shift Keying with these systems and get the best modulation schemes with less BER. Then with the combination of modulation schemes analyze the different encoding schemes such as Cyclic Redundancy Code and Reed – Solomon encoding with these systems. After that redesign the WIMAX system with best encoding and modulation schemes.

Keywords: WiMAX, OFDM, BER, CRC, RS

Abstract: Coriolis mass flowmeter measures the mass flow of the fluid, such as water, acid, chemicals and gas/vapor. This paper covers an experimental analysis on establishing Internet of Things (IoT) interface to the Coriolis Mass Flowmeter (CMF). National Instruments LabVIEW and Data Acquisition Hardware (myRIO-1900) have been used to provide sensing as well as a medium to connect with IoT platform.

Keywords: NI LabVIEW, PZT, myRIO-1900, IoT, IBM Watson Bluemix