Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 55 for “"Multicarrier"”.
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Energy-Efficient Multicarrier and Multicarrier-CDMA Systems
Design, analysis, and performance of Multicarrier (MC) and Multicarrier-Code Division Multiple Access (MC-CDMA) systems are considered. Specifically, Multicarrier Modulation (MCM) such as Orthogonal Frequency Division Multiplexing (OFDM) is used in these systems with emphasis on energy efficiency. …
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Simulation of a multicarrier demultiplexer
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Reliable and Low-Complexity Multicarrier Systems
… a variety of novel reliable and low-complexity multicarrier systems based on index modulation (IM) and deep learning (DL) techniques, particularly tailored to mission-critical MTC applications, such as industrial automation. By integrating the IM concept into the OFDM framework, the resulting …
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New Techniques for Multicarrier Communication Systems
Common to all OFDM systems is a large peak-to-average-power ratio (PAR) problem, which can lead to low power efficiency and nonlinear distortion at the transmit power amplifier. Tone reservation uses unavailable or reserved tones to design a peak-cancelling signal that lowers the PAR of a transmit …
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Multicarrier Wireless Systems with Adaptive Decision Combining
Multicarrier Orthogonal Frequency Division Multiplexing (OFDM) systems with decision combining are considered in this thesis. It is shown that such systems can provide enhanced bit error rates. However, this occurs at the cost of data throughput of the system. The typical system considered …
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Implementation of Wideband Multicarrier and Embedded GSM
… small form factor. First, an optimized wideband multicarrier implementation is presented that substantially increases the capacity beyond that of a single carrier system. Second, the GSM modulator is examined in depth and extended to provide performance that exceeds standards compliance by a …
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SPECTRALLY EFFICIENT MULTICARRIER SYSTEMS FOR FIBER-OPTIC TRANSMISSION
… a comprehensive study of spectrally efficient multicarrier systems for fiber-optic transmission. Multicarrier optical systems partition a high-data rate digital signal in a wavelength channel into multiple subcarriers. The data rate on each subcarrier can be sufficiently low and thus, the …
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An analysis of a broadband multicarrier CDMA cellular communications system
… of a broadband cellular system featuring a multicarrier, code division multiple access (CDMA) method. The system designed complies with Federal Communication Commission broadband cellular standards and uses CDMA to reduce the probabilities of detection and interception as well as providing …
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Capacity, coding and interference cancellation in multiuser multicarrier wireless communications systems
Multicarrier modulation and multiuser systems have generated a great deal of research during the last decade. Orthogonal Frequency Division Multiplexing (OFDM) is a multicarrier modulation generated with the inverse Discrete Fourier Transform, which has been adopted for standards in wireless and …
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Null power reallocation for data rate improvement in a wireless multicarrier system
Multicarrier systems are advantageous for high data rate transmissions in wireless environments due to their ease of implementation and tolerance for multipath delay spread. Currently, these systems as specified by the IEEE 802.11 standards do not adapt to frequency-selective fading but simply …
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Detection and Coding Techniques for Fourth Generation Air-Interfaces based on Multicarrier Modulation
… for the downlink of 4G wireless systems based on multicarrier modulation. Two joint Orthogonal Frequency Division Multiplexing (OFDM) and Code Division Multiple Access (CDMA) schemes have been characterised and compared in respect of their performance in different environments and configurations. …
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On the performance and capacity of space-time block coded multicarrier CDMA communication systems
… technology, space-time block coded (STBC) multicarrier (MC-) CDMA, for next generation of wireless mobile communication systems. The thesis first investigates the bit error ratio (BER) performance and bandwidth efficiency of STBC MC-CDMA systems in the presence of carrier frequency offset …
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An implementation of peak to average power ratio reduction for multicarrier system (orthogonal frequency division multiplexing)
Orthogonal frequency division multiplexing (OFDM) has been becoming more popular modulation technique in the high-speed wireless communication system. It is used especially in Large Term Evaluation technique (LTE) which depended from the fourth-generation (4G) of wireless communication system. OFDM …
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Performance analysis of a multistage multicarrier demultiplexer/demodulator (M-MCDD) in the presence of interference and quantization error
One of several proposed multicarrier demultiplexer/demodulator (MCDD) structures is studied for application to satellite on-board regenerative repeats. The structure considered here is the multistage multicarrier demultiplexer/demodulator (M-MCDD). The M-MCDD has been chosen as the preferred …
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Advanced MIMO-OFDM technique for future high speed braodband wireless communications. A study of OFDM design, using wavelet transform, fractional fourier transform, fast fourier transform, doppler effect, space-time coding for multiple input, multiple output wireless communications systems
… high speed mobile wireless communications on multicarrier systems. At first, alternative multicarrier kernels robust for high speed doubly-selective fading channel are sought. They include the comparisons of discrete Fourier transform (DFT), fractional Fourier transform (FrFT) and wavelet …
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A Filtered Multitone (FMT) Implementation with Custom Instructions on an Altera FPGA
… users and Secondary users (unlicensed users). Multicarrier communication technology is adopted to enable the coexistence of PU and SU. Orthogonal Frequency Division Multiplexing (OFDM) technology has been popular for multicarrier communications. A disadvantage for OFDM in the Cognitive Radio …
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Sistemas de transmissão multiportadora aplicados em um canal acústico submarino na presença de efeito doppler
… an analysis of feasibility of the application of multicarrier transmission application in acoustic communication systems for underwater environment. Such analysis encompass (Single-Carrier Frequency Division Multiple Access) SC-FDMA, (Orthogonal Frequency Division Multiplexing) OFDM and (Frequency …
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