Signal Detection、Frequency Estimation and System Design for a Multi-tone Signal

• Main Authors: Yi-Hsien Lee, 李宜憲
• Other Authors: Char-Dir Chung
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/30783156646894570053

碩士 === 國立中央大學 === 電機工程研究所 === 87 === In the recent past, multi-tone modulation has generated a lot of research interest. Multi-tone Modulation superimposes several carrier-modulated waveforms in parallel subchannels in order to increase the data rate on a channel. Much of the research in this area has focused on providing maximal bandwidth efficiency and has therefore employed M-ary phase shift keying or quadrature amplitude modulation (MPSK and QAM, respectively ) on the subcarriers. In this paper, we discuss how to design a receiving system of multi-tone modulated signals in the AWGN channel when the carrier frequencies of received signals are unknown. We design the structure and operating procedures of the receiving system. It is necessary to ascertain whether multi-tone modulated signals are received so we design the detection module and verification module in the receiving system. Then we design the frequency estimation module to estimate the carrier frequency in the subchannels.