| Summary: | 碩士 === 國立清華大學 === 通訊工程研究所 === 95 === Establishing a radio link in cell-based mobile communication systems involves searching and
synchronizing the downlink known pattern of sequences associated with the base stations.
The searching process, often referred to as cell search, is usually completed by preamble
sequences. Therefore, the performance of cell search depends greatly on the preamble se-
quences. In this thesis, we propose a construction of quasi complete complementary codes
(QCCCs) from Reed-Muller (RM) codes. Since the constructed QCCCs have good auto-
correlation and cross-correlation properties, we employ them as preamble sequences and
propose a preamble structure based on QCCCs. Furthermore, the constructed QCCCs have
low peak-to-average power ratio (PAPR), and hence they are suitable for use in orthogonal
frequency division multiplexing (OFDM) systems. We compare the cell search performance
of using QCCCs as preambles with that of the worldwide interoperability for microwave
access (WiMAX, also referred to as IEEE standard 802.16e) preambles. Simulation results
show that there is minor or acceptable performance degradation with our QCCCs employed
as preambles, while the rich algebraic structures of QCCCs potentially permit low-complexity
encoding and decoding.
|
|---|
