Adaptive inter-carrier interference self-cancellation method...

Details Adaptive inter-carrier interference self-cancellation method... Adaptive inter-carrier interference self-cancellation method...

2003-12-30

2008-10-28

Chan, Wing F. (Department: 2619)

Multiplex communications

Generalized orthogonal or special mathematical techniques

C370S343000, C375S260000

Reexamination Certificate

active

07443782

ABSTRACT:
The present invention discloses an adaptive ICI self-cancellation method, which can adapt to the dynamical change of frequency offset and signal-noise power ratio (SNR), and a device thereof. The adaptive ICI self-cancellation method of the present invention comprises the steps of: estimating the maximum frequency offset and signal-noise power ratio (SNR) of signals, selecting a modulating state in accordance with an adaptive strategy, and determining a demodulating state based on the selected modulating state. An adaptive inter-carrier interference self-cancellation device using the method comprises: a transmitter including a digital demodulator, an inter-carrier interference self-cancellation modulator and an adaptive controller; and a receiver including a digital demodulator, an inter-carrier interference self-cancellation demodulator, a fast Fourier transformer, an estimator, a signaling demodulator and a demodulation controller. Through the present invention, the cancellation of inter-carrier interference is achieved, and at the same time the working state of the digital modulator and the ICI self-cancellation modulator satisfies the highest spectrum efficiency.

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J. Ahn et al, “Frequency Domain Equalisation of OFDM Signals Over Frequency Nonselective Rayleigh Fading Channels” Electronics Letters, Aug. 5, 993, vol. 29, No. 16, pp. 1476-1477.
Yuping Zhao, “Intercarrier Interference Self-Cancellation Scheme for OFDM Mobile Communication Systems”, IEEE Transactions on Communications, vol. 49, No. 7, Jul. 2001, pp. 1185-1191.
Jean Armstrong, “Analysis of New Existing Method of Reducing Intercarrier Interference Due to Carrier Frequency Offset in OFDM”, pp. 365-369.

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