Constant Envelope OFDM Phase Modulation PDF Download

Author: Steve Charles Thompson
Publisher:
ISBN:
Category :
Languages : en
Pages : 430

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Author: Michel Tawfik Fattouche
Publisher:
ISBN:
Category :
Languages : en
Pages : 154

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Author: Ahsen U. Ahmed
Publisher:
ISBN: 9781321005554
Category :
Languages : en
Pages : 145

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Book Description
Constant Envelope OFDM provides a solution to the issue of a high peak-to-average power ratio in OFDM by using angle modulation to transform the OFDM signal to a constant envelope signal. However, Constant Envelope OFDM is based on nonlinear angle modulation and therefore presents its own unique set of challenges. These challenges are studied in this dissertation and addressed through the application of signal reception, equalization and error correction coding techniques to enable robust Constant Envelope OFDM performance. The impact of the threshold effect on Constant Envelope OFDM is studied. More specifically, the impact of cycle slip noise, both due to the threshold effect and phase wrapping issues, on Constant Envelope OFDM performance is considered. A novel cycle slip mitigation technique is developed which results in significant threshold extension. Novel receivers for Constant Envelope OFDM are also developed which allow for a lower complexity receiver implementation. These receivers alleviate the need to employ a phase demodulator at the receiver also resulting in immunity from the threshold effect and phase wrapping issues. The performance of these linear receivers is studied in additive white Gaussian noise (AWGN) and multipath fading channels and they are shown to perform well compared to the conventional arctangent based receiver. In frequency selective fading channels, a frequency domain equalizer is applied to Constant Envelope OFDM and shown to provide good performance in all cases. Since the performance of the frequency domain equalizer depends on the quality of the channel estimate, the effect of the amplifier nonlinearities on the channel estimate is studied for the case of alternate channel estimation training symbols. Furthermore, the application of error correction coding to Constant Envelope OFDM is also studied for the alternate receivers in AWGN and multipath fading channels. Finally, the impact of narrowband interference on Constant Envelope OFDM is studied. A prediction error filter (PEF) is employed to mitigate the narrowband interference resulting in significant performance improvement at low signal to interference ratios.

Author: Kumar Balachandran
Publisher:
ISBN:
Category :
Languages : en
Pages : 185

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Author: Nistha Tandiya
Publisher:
ISBN: 9781321847291
Category :
Languages : en
Pages : 72

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The communication infrastructure is one of the biggest energy consumers in the world. With the expected exponential growth in the demand for wireless traffic, it becomes the foremost priority to make the communication systems energy-efficient. In this work, we will explore two energy efficiency enhancement techniques: Constant-Envelope modulation and Turbo coding. In Constant-envelope modulation, the high Peak-to-Average Power Ratio (PAPR) signal is transformed into a constant-envelope phase modulated signal. Thus the PAPR of the signal reduces to 0 dB, enabling the power amplifiers at the transmitter to work at the energy-efficient operational point. The second technique known as Turbo coding, has been known to perform very close to the theoretical bounds. Thus when Turbo codes are applied on a modulation scheme, there is a significant improvement in bit-error-rate performance. Consequently, the number of retransmissions is decreased which helps to conserve power at the transmitter. In this thesis, we will explore the application of these two established techniques for the modulation schemes used in 3GPP LTE standards: Orthogonal Frequency Division Multiplexing (OFDM) and Single Carrier-Frequency Division Multiple Access (SC-FDMA). We will also present their comparisons in terms of bit-error-rate and spectral efficiency.

Author: Ecehan Uludag
Publisher:
ISBN: 9781339834832
Category :
Languages : en
Pages : 80

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In recent years, there is a dramatic increase in the number of cellular devices. As a result, the wireless network traffic increased as well. 4G, the most recent developed technology, soon will not be good enough to fulfill the increasing need for capacity in the mobile data network. As a consolidation of previous generation technologies, 5G is brought up as a solution. The standardization for 5G is not established yet. Therefore, modulation techniques that can be employed in 5G and which can support the need for the increased capacity are investigated. In this thesis, modulation techniques CE-OFDM and CE-SC-FDMA are being investigated. Their bit error rate performance is compared. It is found that both systems have close bit error rate performance. A power amplifier is added to both systems and it is found that power amplifier has no impact on the performance. Furthermore, CE-OFDMA and CE-SC-FDMA are investigated and their bit error rate performance is found to be similar as well.

Author: Quan Yu
Publisher: Springer
ISBN: 9811044031
Category : Computers
Languages : en
Pages : 297

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Book Description
This book constitutes the proceedings of the First International Conference on Space Information Network, SINC 2016, held in Kunming, China, in August 2016. The 18 full and 6 short papers presented in this volume were carefully reviewed and selected from 139 submissions.The theme of the conference encompasses new progress and development tendency of the space information network and related fields, There were 3 sections in the proceedings of SINC 2016 including the model of space information network and mechanism of high performance networking, theory and method of high speed transmission in space dynamic network, and sparse representation and fusion process in space information.

Author: Sajid Saleem
Publisher:
ISBN:
Category : Aerospace telemetry
Languages : en
Pages :

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Continuous phase modulation~(CPM) is a non-linear, constant-envelope modulation scheme with memory, known for its bandwidth and power efficiency. Multi-h CPM uses multiple modulation indexes in successive symbol intervals to improve the error performance as compared to single-h CPM~(basic CPM that utilizes only a single modulation index). One of the major applications of multi-h CPM is in aeronautical telemetry systems. Modern aeronautical devices host an increasing number of sensors, which can transmit flight testing data to the ground station. However, this excess data transfer increases the intersymbol interference, and thus channel equalization is required at the receiver. The objective of our research is to propose low-complexity frqeuency-domain equalization~(FDE) techniques for multi-h CPM waveforms. For a modulation scheme with memory, such as CPM, the cyclic constraint on the FDE block necessitates the use of an extra segment of symbols, called intrafix or tail segment. We have used very simple geometric arguments to derive upper and lower bounds on the length of the intrafix in terms of the parameters of the modulation scheme and the Frobenius number. It is concluded that the length of the intrafix for multi-h CPM schemes is typically shorter than those required for single-h modulation schemes. We propose two receiver architectures; one uses a matched filter front end, while the other utilizes a fractional sampling front end. Various simplifications are proposed for each architecture, and the trade-off between receiver complexity and performance is analyzed and verified through detailed simulation studies.

Author: Ke-Lin Du
Publisher: Cambridge University Press
ISBN: 1139485768
Category : Technology & Engineering
Languages : en
Pages : 1020

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Book Description
This practically-oriented, all-inclusive guide covers all the major enabling techniques for current and next-generation cellular communications and wireless networking systems. Technologies covered include CDMA, OFDM, UWB, turbo and LDPC coding, smart antennas, wireless ad hoc and sensor networks, MIMO, and cognitive radios, providing readers with everything they need to master wireless systems design in a single volume. Uniquely, a detailed introduction to the properties, design, and selection of RF subsystems and antennas is provided, giving readers a clear overview of the whole wireless system. It is also the first textbook to include a complete introduction to speech coders and video coders used in wireless systems. Richly illustrated with over 400 figures, and with a unique emphasis on practical and state-of-the-art techniques in system design, rather than on the mathematical foundations, this book is ideal for graduate students and researchers in wireless communications, as well as for wireless and telecom engineers.

Author: Srija Unnikrishnan
Publisher: Springer Science & Business Media
ISBN: 3642184391
Category : Computers
Languages : en
Pages : 554

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Book Description
This book constitutes the refereed proceedings of the International Conference on Advances in Computing Communications and Control, ICAC3 2011, held in Mumbai, India, in January 2011. The 84 revised full papers presented were carefully reviewed and selected from 309 submissions. The papers address issues such as AI, artificial neural networks, computer graphics, data warehousing and mining, distributed computing, geo information and statistical computing, learning algorithms, system security, virtual reality, cloud computing, service oriented architecture, semantic web, coding techniques, modeling and simulation of communication systems, network architecture, network protocols, optical fiber/microwave communication, satellite communication, speech/image processing, wired and wireless communication, cooperative control, and nonlinear control, process control and instrumentation, industrial automation, controls in aerospace, robotics, and power systems.