Multiplex communications – Duplex – Transmit/receive interaction control
Reexamination Certificate
2007-04-10
2007-04-10
To, Doris H. (Department: 2616)
Multiplex communications
Duplex
Transmit/receive interaction control
C370S342000, C375S148000
Reexamination Certificate
active
10162194
ABSTRACT:
A multiuser interference elimination apparatus in which, even in the second and other subsequent stages, adaptive updating of antenna weights can be performed and antenna weights can be generated with accuracy by using interference-canceled received signals. A multiplier performs gain correction by multiplying a symbol replica transmitted from the preceding stage by a coefficient [1−(1−α)m−1], and an antenna signal regeneration section converts the gain-corrected symbol replica into antenna signals. Adders add the antenna signals converted by the antenna signal regeneration section to outputs from despread devices and output the addition results to an antenna weight adaptive updating section. The antenna weight adaptive updating section performs adaptive updating of antenna weights by using the addition results.
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Naoto Ishii, et al., “Development of a Parallel Multi-User Interference Canceller for W-CDMA”, Communication Society Conference Papers, Institute of Electronics, Information and Communication Engineers, Aug. 16, 1999, 1, p. 251, B-5-16.
S. Marinkovic et al., “Space-Time Iterative and Multistage Receiver Structures for CDMA Mobile Communication Systems”, VTC 2001 SPRING. IEEE VTS 53RD, Vehicular Technology Conference, (May 6-9, 2001), pp. 1799-1803 with Abstract.
Ishii Naoto
Yoshida Shousei
NEC Corporation
Sughrue & Mion, PLLC
To Doris H.
Tsegaye Saba
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