Wireless communicaton apparatus

Details Wireless communicaton apparatus Wireless communicaton apparatus

2011-06-07

2011-06-07

Odom, Curtis B (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S267000, C370S203000, C370S208000, C370S210000

Reexamination Certificate

active

07957476

ABSTRACT:
A wireless communication apparatus for receiving a packet formed of a signal modulated by OFDM includes the following elements. A band-pass filter extracts an OFDM signal of a desired band. A low-noise amplifier having a gain controlled according to a received-signal intensity amplifies the desired OFDM signal. A frequency converter down-converts the amplified OFDM signal into a baseband signal. An analog-digital converter converts the baseband signal into a digital signal. A first high-pass filter removes a DC offset from the baseband signal corresponding to a predetermined preamble portion of the packet. A frequency-offset estimator estimates a frequency offset from the sample signals constituting the baseband signal from which the DC offset has been removed by the first high-pass filter. A frequency-offset corrector removes the estimated frequency offset from the baseband signal. A demodulator demodulates subcarrier signals arranged in a frequency domain from the baseband signal compensated for the frequency offset.

REFERENCES:
patent: 2003/0133518 (2003-07-01), Koomullil et al.
patent: 2003/0174790 (2003-09-01), Ho et al.
patent: 2004/0146122 (2004-07-01), Fague et al.
patent: 2004/0202102 (2004-10-01), Kim et al.
patent: 2005/0020226 (2005-01-01), Mohindra
patent: 2005/0078509 (2005-04-01), Parkin
patent: 2005/0276358 (2005-12-01), Pipilos
Batra, “Multi-band OFDM Physical Layer Proposal”, IEEE P802.15, Jul. 14, 2003.
Namgoong et al., “Direct-Conversion RF Receiver Design”, IEEE Transactions on Communications, vol. 49, No. 3, Mar. 2001, pp. 518-529.
Gil et al., “Joint ML Estimation of Carrier Frequency, Channel, I/Q Mismatch, and DC Offset in Communication Receivers”, IEEE Transactions on Vehicular Technology, vol. 54, No. 1, Jan. 2005, pp. 338-349.
Ho et al., “Low Complexity Frequency Offset Estimation in the Presence of DC Offset”, Proc. of IEEE International Conference on Communications 2003, vol. 3, May 2003, pp. 2051-2055.
Yuba et al., “Decision Directed Scheme for IQ Imbalance Compensation on OFCDM Direct Conversion Receiver”, IEICE Trans. on Communications, vol. E89-E, No. 1, Jan. 2006, pp. 184-190.
Olsson et al., “WLAN/WCDMA Dual-Mode Receiver Architecture Design Trade-Offs”, IEEE 6th CAS Symp., vol. 2, May 31-Jun. 2, 2004, pp. 725-728.
Itani, “OFDM Modulation Technique”, (Triceps, 2000).
IEEE Std. 802. 11a-1999, Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specification: High-speed Physical Layer in the 5 GHZ Band.
IEEE Std. 802. 11g-2003, Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: Amendment 4: Further Higher Data Rate Extension in the 2.4 GHz Band.
Otaka et al., “A Low Offset 1.9-GHz Direct Conversion Receiver IC with Spurious Free Dynamic Range of over 67 dB,”IEICE Trans. Fundamentals, vol. E84 A, No. 2, Feb. 2001, pp. 514-519.

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