Thesis (M.S.)--Rochester Institute of Technology, 1989. / Includes bibliographical references (leaves 50-52).

Thesis (M.S.)--Rochester Institute of Technology, 1992. / Typescript. Includes bibliographical references (leaves 50-53).

Thesis (M.S.)--Rochester Institute of Technology, 1991. / Folded charts located in back pocket of book. Includes bibliographical references (leaves 61-64).

Thesis (M.S.)--Rochester Institute of Technology, 1987. / Typescript. Includes bibliographical references (leaves 100-101).

Thesis (Ph.D.) in Chemistry--University of Maine, 2006. / Includes vita. Includes bibliographical references (leaves 125-137).

In this thesis, a novel training sequence is proposed for timing offset estimation in orthogonal frequency division multiplexing (OFDM) systems. The proposed training sequence and the derived timing offset estimator are proved to outperform traditional schemes. In timing estimation of OFDM systems, the scheme proposed by Schmidl [4,5] is perhaps the most well-known one. However, Schmidl¡¦s scheme has a plateau in timing metric, which substantially degrades system performance. In this thesis, simulation experiments are conducted to evaluate the performance of the proposed timing offset estimator and the mean square error (MSE) is adopted as the performance measure. Simulation results demonstrate that the performance of the proposed scheme not only improves Schmidl¡¦s scheme, but also outperforms Minn¡¦s [9] and Park¡¦s [10] schemes.

In this thesis, a new spreading code -- complete offset-stacked spreading code (OSC) is designed and discussed. OSC has a orthogonal complementary property of auto-correlation and cross-correlation. According to the interference-free windows of cross-correlation (CC_IFW) of OSC, the proposed CDMA architecture can offer an MAI-free operation in both down-link (synchronous channel) and up-link (asynchronous channel) transmission under the AWGN channel. According to the interference-free windows of auto-correlation (AC_IFW) of OSC, the proposed CDMA architecture can also offer a part of MI-free operation in both downlink (synchronous channel) and uplink (asynchronous channel). Furthermore, the range of AC_IFW is restricted by the number of offset chips.

Orthogonal frequency division multiplexing systems are much more sensitive to timing and frequency error, therefore there were several methods to estimate time and frequency offset. In the thesis, a novel timing offset estimation method for OFDM systems is proposed, it transmits a specific training symbol in the time domain at transmitter. At the receiver, it estimate the timing offset by using a specific timing metric. The proposed scheme isn¡¦t affected by the frequency offset compare with Zhang¡¦s method, and it can estimate timing offset more accurately than Schmidl¡¦s method and Minn¡¦s method. We will analyze the statistical characteristic of the timing metric we proposed at correct time. According to the analysis and simulation result, it can show the accuracy of our analysis. Finally from the simulation result, it demonstrates that the proposed scheme has better performance.

Thesis (M.S.)--Rochester Institute of Technology, 1990. / "List of references": leaves 152-155.

Thesis (M.S.)--Rochester Institute of Technology, 1991. / Includes bibliographical references (leaf 84).