Wireless communications structures and methods utilizing...

Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail

Reexamination Certificate

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Details

C455S069000, C370S334000, C375S299000

Reexamination Certificate

active

07072693

ABSTRACT:
Wireless communications structures and methods are provided that utilize frequency domain spatial processing. Structure is included that receives and transmits signals from an array of Mβ antennas wherein the antennas are connected to M switches in groups of β. Each switch is connected to a single spatial processing channel and β antennas and each spatial processing channel is assigned complex multiplicative factor(s), or weight(s), that enhance overall system performance in the presence of interference and propagation-related impairments such as multipath fading.

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Lal C. Godara, “Applications of Antenna Arrays to Mobile Communications, Part II: Beam-Forming and Direction-of-Arrival Considerations”, Proceedings of the IEEE, vol. 85, No. 8, Aug. 1997.
Van Veen, B. D., et al., “Beamforming: A Versatile Approach to Spatial Filtering”, IEEE ASSP Magazine, Apr. 1988, pp. 4-24.
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K. K. Wong, et al., “Adaptive Antennas at the Mobile and Base Stations in an OFDM/TDMA System”, IEEE Transactions on Communications, vol. 49, No. 1 Jan. 2001, pp. 195-206.
Lal C. Godara, et al., “Limitations and Capabilities of Frequency Domain Broadband Constrained Beamforming Schemes”, IEEE Transactions on Signal Processing, vol. 47, No. 9 Sep. 1999, pp. 2386-2395.

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