Naval Postgraduate School
Theses and Dissertations
Now showing items 1-10 of 11
A comparison of frequency offset estimation methods in Orthogonal Frequency Division Multiplexing (OFDM) systems
(Monterey California. Naval Postgraduate School, 2004-12)
OFDM is a modulation technique that achieves high data rates, increased bandwidth efficiency and robustness in multipath environments. However, OFDM has some disadvantages, such as sensitivity to channel fading, large peak ...
A comparison of timing methods in orthogonal frequency division multiplexing (OFDM) systems
(Monterey California. Naval Postgraduate School, 2004-09)
Orthogonal frequency division multiplexing (OFDM) is being used by wireless local area network (WLAN) standards, such as IEEE 802.11a, and wireless metropolitan area network (MAN) standards, such as IEEE 802.16a. OFDM is ...
Hardware-in-the-Loop control of a cascaded multi-level converter
(Monterey, California. Naval Postgraduate School, 2004-06)
Next-generation U.S. Navy destroyers, known as DD(X), will use electric drive motors to meet their propulsion needs instead of the traditional mechanical drives. The use of electric drive motors in naval vessels has spurred ...
Direct-sequence spread-spectrum acoustic communications with CRV Decomposition
(Monterey, California. Naval Postgraduate School, 2004-06)
Direct-Sequence Spread-Spectrum (DS-SS) is among the preferred modulation techniques for military applications. DS-SS offers three greatly desired characteristics. It allows for the development of Low Probability of Detection ...
Reed-Muller codes in error correction in wireless adhoc networks
(Monterey California. Naval Postgraduate School, 2004-03)
The IEEE 802.11a standard uses a coded orthogonal frequency division multi-plexing (COFDM) scheme in the 5-GHz band to support data rates up to 54 Mbps. The COFDM was chosen because of its robustness to multipath fading ...
An investigation of wireless solutions for the "Last Mile"
(Monterey, California. Naval Postgraduate School, 2004-03)
The need for broadband network access is experiencing rapid growth, but what is currently available is not sufficient. Copper-based technologies cannot address the requirements of today's bandwidth-intensive Internet ...
Performance of acoustic spread-spectrum signaling in simulated ocean channels
(Monterey, California. Naval Postgraduate School, 2003-06)
Direct-Sequence Spread Spectrum (DSSS) modulation is being advanced as the physical-layer basis for Seaweb undersea acoustic networking. DSSS meets the need for channel tolerance, transmission security, and multi-user ...
Performance of IEEE 802.11a wireless LAN standard over frequency-selective, slow, ricean fading channels
(Monterey California. Naval Postgraduate School, 2002-09)
With the rapidly growing demand for more reliable and higher data rate wireless communications, the Institute of the Electrical and Electronics Engineers (IEEE) 802.11 working group approved a standard for 5 GHz band, ...
A fixed-point phase lock loop in a software defined radio
(Monterey California. Naval Postgraduate School, 2002-09)
A software defined radio is a much more flexible platform than traditional, hardware implemented radios. By implementing radio functions in software, and putting those functions on a Field Programmable Gate Array (FPGA) ...
Bootstrap based signal denoising
(Monterey, California. Naval Postgraduate School, 2002-09)
"This work accomplishes signal denoising using the Bootstrap method when the additive noise is Gaussian. The noisy signal is separated into frequency bands using the Fourier or Wavelet transform. Each frequency band is ...
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