Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2005-04-19
2005-04-19
Ha, Dac V. (Department: 2634)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S148000, C375S349000, C370S334000, C370S441000, C370S479000, C455S059000, C455S065000, C455S278100, C455S303000
Reexamination Certificate
active
06882678
ABSTRACT:
A receiver for the third-generation (“3G”) CDMA wireless system is disclosed. The receiver is adapted to mitigate the correlated interference by adaptive antenna process which will maximize the signal-to-interference-plus-noise ratio. After the mitigation of correlated interference from first step space process, the second step is to counter fading with MRC which is optimum after the mitigation of correlated interference. After these first two steps of interference mitigation by adaptive antennas and fading compensation through MRC, the decision signal for the first stage of MPIC will have the strongest desired part and least interference compared to any MPIC available. As can be appreciated, the first stage BER of the present receiver will be the lowest. Then, this low BER will result in a more accurate MAI regeneration, which will further cause a lower BER for the next stage and any subsequent stages. Therefore, the BER of the receiver of the present invention is more likely to converge to the BER of a single user, i.e. MAI-free, faster than those in the conventional systems. In other words, for a given BER requirement, the receiver of the present invention will take the least number of iterations to achieve.
REFERENCES:
patent: 5644592 (1997-07-01), Divsalar et al.
patent: 5999560 (1999-12-01), Ono
patent: 6215814 (2001-04-01), Ylitalo et al.
patent: 6570864 (2003-05-01), Kim et al.
Kong Ning
Zhou Xue-Song
East IP Group
Ha Dac V.
Yu Philip K.
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