Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2003-11-04
2010-10-26
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Receivers
Interference or noise reduction
C375S316000, C375S285000, C375S130000, C375S137000, C375S138000, C375S144000, C375S148000
Reexamination Certificate
active
07822155
ABSTRACT:
Methods and apparatus that improve interference (I) estimation in CDMA systems in which the DPCH is sorted under a scrambling code different from the scrambling code of a channel such as the CPICH are described. In such systems, DPCH I-estimation cannot be done by measuring on the CPICH and transforming to the DPCH due to the different interference situations on the two channels. Instead, the DPCH interference is estimated by using knowledge of empty channelization codes in the alternative or secondary scrambling code that can be used for I estimation, or using symbols (e.g., control symbols on the DPCCH) on the DPCH, or searching for an empty channelization code and using a found empty code for I-estimation. These techniques improve the SIR estimate in comparison to prior techniques and hence also improve the performance of power control, increasing the system's capacity.
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Lindoff Bengt
Nilsson Johan
Palenius Torgny
Liu Shuwang
Potomac Patent Group PLLC
Tayong Helene
Telefonaktiebolaget L M Ericsson (publ)
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