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Air traffic and on-board data access services are expected to have tremendous growth, possibly even exponentially in the near future. In order to meet these challenges, Orthogonal Frequency Division Multiplexing (OFDM) can be deployed to enable the increased usage of broadband services on-board. The Doppler effect is one of the major issues in implementing OFDM modulation in aeronautical satellite...
In this paper Discrete Cosine Transform and Fast Fourier Transform based Orthogonal Frequency Division Multiplexing (DCT-OFDM and FFT-OFDM) systems with frequency modulation are examined. Frequency modulation is used in both systems to achieve constant envelope (CE) signals and hence 0 dB PAPR; well-suited for efficient power amplification. The performances of such systems are examined over flat fading...
The performance of a low-complexity detection technique for OFDM-IM over the Nakagami-m fading channel has been analyzed. The orthogonal frequency-division multiplexing with index modulation (OFDM-IM) has recently been used in conjunction with the subcarriers using on-off keying modulation. The result shows improved performance in comparison with the conventional OFDM. The closed-form expression for...
Recently, Orthogonal Frequency Division Multiplexing with Index Modulation (OFDM-IM) has been introduced as a novel multi-carrier system to carry additional information bits compared to conventional OFDM. In this paper, we provide a closed-form expression of an OFDM-IM system for M-ary signal constellations such as M - QAM and M - PSK modulation schemes over a Nakagami-m fading channel. Simulation...
Multi-h CPFSK mapper in an OFDM system can offer significant gain in both PAPR and bit error rate probability. The OFDM PAPR problem is addressed and investigated using SLM reduction technique. Next, an OFDM system with a multi-h CPFSK mapper is considered and its performance is evaluated in terms of the upper and lower bounds on bit error rate probability, and a closed form expression is obtained...
In this paper, a class of OFDM systems with Continuous Phase Modulation (CPM) mapper signals is discussed and theoretical predictions for symbol error probabilities are derived, where the memory is employed to improve system performance. Previously, results summarized that binary data of OFDM systems with CPM mapper is mapped with complex symbols using the concept of correlated phase states of CPM...
Smart grid can be thought of as a network of interconnected wireless networks. In such a network, critical reports generated at the customer sites are required to be communicated to a control station through several layers of wireless networks. Communication in these sub-networks is typically achieved using IEEE 802.11 technology that uses Orthogonal Frequency Division Multiplexing (OFDM). Conventionally,...
This paper gives an analysis about OFDM based WiMAX 802.16e with optimum training symbols. In further, performance is evaluated by considering the variable Delay Spread, Frequency Diversity, and with different Adaptive Modulation and Coding. The evaluation of system is performed over simulations showing, Packet error ratio [PER] versus mean Eb/No with Rayleigh fading. The system is considered with...
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