Wireless communication method and wireless communication...

Details Wireless communication method and wireless communication... Wireless communication method and wireless communication...

2011-06-07

2011-06-07

Payne, David C. (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S259000, C370S208000

Reexamination Certificate

active

07957480

ABSTRACT:
A wireless communication apparatus generates transmission signal including first and second pilot signal sequences allocated to first and second frequencies symmetrically located in relation to a center frequency, and third and fourth pilot signal sequences allocated to third and fourth frequencies symmetrically located in relation to the center frequency, quadrature-modulates the transmission signal, to obtain a quadrature modulation signal, quadrature-demodulates the quadrature modulation signal, to obtain a reception signal, extracts first to fourth pilot signal sequences from the reception signal, estimates a first transfer characteristic concerning first and second frequency by using first and second pilot signal sequences, estimates a second transfer characteristic concerning third and fourth frequencies using third and the fourth pilot signal sequences, generates a third transfer characteristic from which an influence of transmission IQ imbalance is removed by using first and second transfer characteristic, and estimates, from the third transfer characteristic, reception IQ imbalance characteristic.

REFERENCES:
patent: 4945549 (1990-07-01), Simon et al.
patent: 2005/0185699 (2005-08-01), Feher
patent: 2007/0201351 (2007-08-01), Egashira et al.
patent: 2008/0037410 (2008-02-01), Egashira et al.
patent: 2009/0268825 (2009-10-01), Sakai et al.
patent: 2001-119364 (2001-04-01), None
Yoshimasa Egashira, et al., “A Novel IQ imbalance Compensation Scheme using Pilot-signals for OFDM”, Proceedings of the 2006 IEICE Communications Society Conference, Sep. 7, 2006, p. 361 and 3 cover pages.

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