DESIGN ANALYSIS OF ESTIMATION AND OFFSET CORRECTION IN 4G+ SYSTEMS
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Balda supriya, K.Chandrasekhar
The increase in the number of RF devices and the requirement for large data rates places major role in increasing demand on bandwidth. This necessitates the need for RF communication systems with increased throughput and capacity. MIMO-OFDM is one way to meet this basic requirement. OFDM is used in many (WCD) wireless communication devices and offers high spectral efficiency and resilience to multipath channel effects. Though OFDM is very sensitive to synchronization errors, it makes the task of channel equalization simple. MIMO utilize the multiple antennas to increase throughput without increasing transmitter power or bandwidth. This project presents an introduction to the (MPC) multipath fading channel and describes an appropriate channel model. Many modulation schemes are presented (i.e. BPSK, QPSK, QAM) that are often used in Conjunction with OFDM. Mathematical modeling and analysis of OFDM are given along with a discrete implementation common to modern RF communication systems. Synchronization errors are modeled mathematically and simulated, as well as techniques to estimate and correct those errors at the receiver accurately.
Balda supriya, K.Chandrasekhar
The increase in the number of RF devices and the requirement for large data rates places major role in increasing demand on bandwidth. This necessitates the need for RF communication systems with increased throughput and capacity. MIMO-OFDM is one way to meet this basic requirement. OFDM is used in many (WCD) wireless communication devices and offers high spectral efficiency and resilience to multipath channel effects. Though OFDM is very sensitive to synchronization errors, it makes the task of channel equalization simple. MIMO utilize the multiple antennas to increase throughput without increasing transmitter power or bandwidth. This project presents an introduction to the (MPC) multipath fading channel and describes an appropriate channel model. Many modulation schemes are presented (i.e. BPSK, QPSK, QAM) that are often used in Conjunction with OFDM. Mathematical modeling and analysis of OFDM are given along with a discrete implementation common to modern RF communication systems. Synchronization errors are modeled mathematically and simulated, as well as techniques to estimate and correct those errors at the receiver accurately.
A NOVEL MITIGATION TECHNIQUE FOR PAPR IN OFDM USING RESOURCE BLOCK WEIGHT ALGORITHM
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Ch.Naga Lakshmi, K.Chandrasekhar
Abstract: Orthogonal frequency multiplexing (OFDM)[1] is a widely used method in wireless communication systems. Due to effectiveness in multipath channel conditions, OFDM has been adopted by several wireless standards. OFDM is a digital multicarrier modulation access system for high data rate transfer, it provides protection against co-channel interference and greater immunity to multipath fading. The major disadvantage is it exhibits high peak average power ratio (PAPR)[1]which increases the complexity of the system and lower efficiency. Similarly we have different distortion and distortion less techniques, which have several advantages and disadvantages among them is clipping which has high distortion in the in- band and out- band but ICTF is also distortion technique which has improved performance compared to it, but the main disadvantage is delay is more since it performs sample by sample operation, so here introducing a new technique called a Resource Block Weight algorithm which performs block by block operation by reducing the delay and improving the peak to average power ratio. It contains a precoding matrix which assigns a unit gain to the total matrix, the pre-coding weights can be designed to minimize the modulus variations of the resulting signal, leading generally to a reduction in PAPR. Index terms: Orthogonal frequency division multiplexing (OFDM),Peak to average power ratio(PAPR)[1],Iterative companding transform and filtering (ICTF),Resource Block weight algorithm(RBWA)
Ch.Naga Lakshmi, K.Chandrasekhar
Abstract: Orthogonal frequency multiplexing (OFDM)[1] is a widely used method in wireless communication systems. Due to effectiveness in multipath channel conditions, OFDM has been adopted by several wireless standards. OFDM is a digital multicarrier modulation access system for high data rate transfer, it provides protection against co-channel interference and greater immunity to multipath fading. The major disadvantage is it exhibits high peak average power ratio (PAPR)[1]which increases the complexity of the system and lower efficiency. Similarly we have different distortion and distortion less techniques, which have several advantages and disadvantages among them is clipping which has high distortion in the in- band and out- band but ICTF is also distortion technique which has improved performance compared to it, but the main disadvantage is delay is more since it performs sample by sample operation, so here introducing a new technique called a Resource Block Weight algorithm which performs block by block operation by reducing the delay and improving the peak to average power ratio. It contains a precoding matrix which assigns a unit gain to the total matrix, the pre-coding weights can be designed to minimize the modulus variations of the resulting signal, leading generally to a reduction in PAPR. Index terms: Orthogonal frequency division multiplexing (OFDM),Peak to average power ratio(PAPR)[1],Iterative companding transform and filtering (ICTF),Resource Block weight algorithm(RBWA)
AN OVERVIEW OF MIMO FOR VARIOUS FIELDS
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SHAIK.VAHIDA , Research Scholar, VIT University, Vellore, Tamilnadu
Abstract -This research article presents an overview of MIMO(Multiple input and Multiple output) in all different aspects of fields and its Applications which open the Door for Future Trends like(5G).The key technologies in this paper includes all the concepts related to MIMO which extensively used in Relay communications, Power line Communications , Cognitive Radio ,Heteterogeonous Networks, Multipath Propagation Environment and for all indoor and outdoor Environments. This paper also represent In which Field what are all the Advantages and Challenges for Future Enhancements are discussed.
SHAIK.VAHIDA , Research Scholar, VIT University, Vellore, Tamilnadu
Abstract -This research article presents an overview of MIMO(Multiple input and Multiple output) in all different aspects of fields and its Applications which open the Door for Future Trends like(5G).The key technologies in this paper includes all the concepts related to MIMO which extensively used in Relay communications, Power line Communications , Cognitive Radio ,Heteterogeonous Networks, Multipath Propagation Environment and for all indoor and outdoor Environments. This paper also represent In which Field what are all the Advantages and Challenges for Future Enhancements are discussed.
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