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TSP
2008

Carrier Frequency Offset Mitigation in Asynchronous Cooperative OFDM Transmissions

13 years 3 months ago
Carrier Frequency Offset Mitigation in Asynchronous Cooperative OFDM Transmissions
Carrier frequency offset (CFO) mitigation is critical for orthogonal frequency-division multiplexing (OFDM)-based cooperative transmissions because even small CFO per transmitter may lead to severe performance loss, especially when the number of cooperative transmitters is large. In this paper, we show that cyclic prefix (CP) can be exploited to mitigate or even remove completely the CFO. The mitigation performance increases along with the CP length. In particular, long CP with length proportional to , where is the fast Fourier transform (FFT) block length and is the number of cooperative transmitters, can guarantee a complete CFO removal. While this comes with a reduction in bandwidth efficiency, the long CP in the proposed scheme is exploited to enhance transmission power efficiency in a way similar to spread-spectrum systems, and thus is different from conventional CP that degrades both bandwidth and power efficiency. An efficient CFO-mitigation algorithm is developed that has compl...
Xiaohua Li, Fan Ng, Taewoo Han
Added 15 Dec 2010
Updated 15 Dec 2010
Type Journal
Year 2008
Where TSP
Authors Xiaohua Li, Fan Ng, Taewoo Han
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