Design of a MIMO OFDM Baseband Transceiver for Cognitive Radio Systems
Date Issued
2005
Date
2005
Author(s)
Lien, Jui-Ping
DOI
zh-TW
Abstract
As the wirelsss applications become more and more sophisticated and widely used, the demand for more bandwidth will increase substantially. However, wide ranges of potential spectral resources are only used rarely nowadays. In order to enhance the spectrum efficiency, the concept of cognitive radio has been proposed.
Cognitive radio system is a radio system that can sense the spectrum environment and use the spectrum only if communication does not interfere with primary users, and also adjust the transmission parameters adaptively to increase spectral efficiency. In this thesis, the system specifications and packet formats are proposed according to the functional requirement of cognitive radio systems. Under the proposed system specifications, the 2x2 MIMO-OFDM baseband transceiver for cognitive radio systems has also been developed.
The design of baseband transceiver has the two main considerations. One is parameterized design, that is, the parameters of all functional blocks need to be adjusted adaptively according to dynamic spectrum allocations, and the packet format including signal design of preamble and subcarrier allocation do as well. The other aspect is the sensing capability. The receiver will estimate the channel environment to access the channel quality and thus adapt its transmission parameters. The system design is developed with sample-based floating-point C++ programs, so the latency and complexity of hardware is also evaluated and thus can fasten the IC design procedure in the future.
Subjects
正交分頻多工
感知無線電系統
多重輸入輸出
OFDM
Cognitive Radio
MIMO
Type
thesis
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