Implementation of Carrier Interferometry OFDM by Using Pulse Shaping Technique in Frequency Domain

Xu, Fang; Ru, Xu; Sun, Haixin

doi:10.1109/iwasid.2007.373647

Cited by 13 publications

(1 citation statement)

References 4 publications

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“…Although the CI-OFDM attains performance gain from frequency diversity, it introduces higher implementation complexity, compared to conventional OFDM systems. Fortunately, the carrier interferometry can be implemented by using inverse fast Fourier transform (IFFT) at the transmitter and correspondingly FFT at the receiver [4], [5]. Thus, the available subcarriers may not be continuous in applications such as cognitive radio.…”

Section: Introductionmentioning

confidence: 99%

Performance enhancement of OFDM systems based on signal spreading

Juang

Yar

Lin

et al. 2011

2011 IEEE 7th International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob)

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Frequency-selective fading and inter-carrierinterference (ICI) are two fundamental issues that should be dealt with before adopting orthogonal frequency division multiplexing (OFDM). Instead of using complex designs for exploiting frequency diversity and cancelling ICI, this paper explores how spreading signal, on either frequency-domain or time-domain, can improve the performance of OFDM systems. Based on the carrier interferometry technique, information symbols are spread over all the OFDM subcarriers to pursue frequency diversity. Then a packet retransmission scheme, which can be seem as spreading signal in time-domain, is proposed to suppress ICI. Numerical simulations show that frequency diversity can be pursued by spreading information symbols in OFDM subcarrier domain and that ICI can be suppressed by spreading packets in time domain. As a result, an enhanced OFDM system with low complexity signal spreading can be delivered.I.

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Section: Introductionmentioning

confidence: 99%