DocumentCode :
3237400
Title :
Realizable Ideal D/C and C/D converters for OFDM signals
Author :
Chang, Ming-Xian ; Hsieh, Tsung-Da
Author_Institution :
Dept. of Electr. Eng., Nat. Cheng-Kung Univ. Tainan, Tainan
fYear :
2009
fDate :
March 30 2009-April 1 2009
Firstpage :
1
Lastpage :
5
Abstract :
For real bandlimited periodic signals, the author in derives the realizable ideal D/C converter that is composed of finite number of finite-duration periodic pulses. However, we can not apply the results in for complex bandlimited periodic signals, such as the baseband signals in the orthogonal frequency-division multiplexing (OFDM) system. In this paper, we first derive the realizable ideal D/C converter for the complex baseband signals of the OFDM system. The proposed D/C converter is composed of only finite-number of finite-duration complex periodic pulses, and therefore is realizable within one period of the signal. Based on the orthogonality among the circularly-shifted interpolation pulses, we also propose a realizable ideal C/D converter that could implement the ideal sampling for the OFDM signals. Due to the complex interpolation pulse, the signals in the I- and Q-channels are coupled together in the ideal D/C (or C/D) converter, and we can not decouple the ideal D/C (or C/D) converter into two independent D/C (or C/D) converters in the I- and Q-channels.
Keywords :
OFDM modulation; convertors; C/D converters; D/C converters; OFDM signals; bandlimited periodic signals; baseband signals; finite-duration periodic pulses; orthogonal frequency-division multiplexing system; Bandwidth; Baseband; Discrete Fourier transforms; Interpolation; Matrix converters; OFDM; Pulse modulation; Pulse width modulation converters; Radio frequency; Sampling methods;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Sarnoff Symposium, 2009. SARNOFF '09. IEEE
Conference_Location :
Princeton, NJ
Print_ISBN :
978-1-4244-3381-0
Electronic_ISBN :
978-1-4244-3382-7
Type :
conf
DOI :
10.1109/SARNOF.2009.4850337
Filename :
4850337
Link To Document :
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