Channel estimates in a CDMA system using power control bits
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04B-001/38
H04C-005/16
출원번호
US-0151713
(1998-09-11)
발명자
/ 주소
Ramesh, Rajaram
Wang, Yi-Pin Eric
출원인 / 주소
Ericsson Inc.
대리인 / 주소
Coats & Bennett, P.L.L.C.
인용정보
피인용 횟수 :
12인용 특허 :
16
초록▼
A transceiver transmits signals with power control bits, the power control bits instructing the other transceiver to establish selected power levels for its return signal. In one form, a processor is adapted to determine channel coefficients for the pilot symbols as a function of both (1) the select
A transceiver transmits signals with power control bits, the power control bits instructing the other transceiver to establish selected power levels for its return signal. In one form, a processor is adapted to determine channel coefficients for the pilot symbols as a function of both (1) the selected power levels of the other transceiver signal and (2) the difference between the predetermined pilot symbols and the pilot symbols as received by the receiver. The processor then interpolates channel coefficients for all symbols in the received signals based on the determined pilot symbol channel coefficients. In an alternate form, the processor uses a selected auto-correlation function which takes into account the selected power levels of the other transceiver signal to calculate an interpolation filter. In this alternate form, the processor then uses the calculated interpolation filter and channel coefficients for the pilot symbols to interpolate channel coefficients for symbols between the pilot symbols. A demodulator demodulates all received symbols based on the interpolated channel coefficients.
대표청구항▼
A transceiver transmits signals with power control bits, the power control bits instructing the other transceiver to establish selected power levels for its return signal. In one form, a processor is adapted to determine channel coefficients for the pilot symbols as a function of both (1) the select
A transceiver transmits signals with power control bits, the power control bits instructing the other transceiver to establish selected power levels for its return signal. In one form, a processor is adapted to determine channel coefficients for the pilot symbols as a function of both (1) the selected power levels of the other transceiver signal and (2) the difference between the predetermined pilot symbols and the pilot symbols as received by the receiver. The processor then interpolates channel coefficients for all symbols in the received signals based on the determined pilot symbol channel coefficients. In an alternate form, the processor uses a selected auto-correlation function which takes into account the selected power levels of the other transceiver signal to calculate an interpolation filter. In this alternate form, the processor then uses the calculated interpolation filter and channel coefficients for the pilot symbols to interpolate channel coefficients for symbols between the pilot symbols. A demodulator demodulates all received symbols based on the interpolated channel coefficients. 735, 20000400, Bassetti et al., 345/204; US-6114915, 20000900, Huang et al., 331/025; US-6133770, 20001000, Hasegawa, 327/156; US-6144242, 20001100, Jeong et al., 327/269; US-6147699, 20001100, Berry et al., 347/255; US-6167103, 20001200, Hardin, 375/376; US-6175259, 20010100, Mann et al., 327/159; US-6198353, 20010300, Janesch et al., 331/016; US-6240123, 20010500, Zhang et al.; US-6292507, 20010900, Hardin et al., 375/130
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이 특허에 인용된 특허 (16)
Jasper Steven C. (4370 Haman Ct. Hoffman Estates IL 60195) Birchler Mark A. (472 Dee La. Roselle IL 60172) Solomon James D. (185 W. Brandon Ct. - Unit F Palatine IL 60067), Communication signal having a time domain pilot component.
Marchetto Robert F. (Burnaby CAX) Stewart Todd A. (Vancouver CAX) Ho Paul K.-M. (Surrey CAX), Compensation for multi-path interference using pilot symbols.
Gilhousen Klein S. (San Diego CA) Padovani Roberto (San Diego CA) Weaver ; Jr. Lindsay A. (San Diego CA), Method and apparatus for controlling transmission power in a CDMA cellular mobile telephone system.
Peter A Keevill GB; Dawood Alam GB; John M. Nolan GB; Matthew Collins GB; Thomas Foxcroft GB; David H. Davies GB; Jonathan Parker GB, Single chip VLSI implementation of a digital receiver employing orthogonal frequency division multiplexing.
Asai, Takahiro; Oda, Yasuhiro; Sugiyama, Takatoshi; Yoshino, Hitoshi, Controller and transmission and reception method for radio communications in a transceiver for radio communications.
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