FIR filter of DS-CDMA UWB modem transmitter and control...

Pulse or digital communications – Receivers – Interference or noise reduction

Reexamination Certificate

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Reexamination Certificate

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07436915

ABSTRACT:
An FIR filter of a DS-CDMA UWB modem transmitter and a control method thereof are disclosed. The FIR filter includes an LUT control device for outputting a resultant value of “0” to all adders if data values corresponding to upper three chips H2, M2and L2and lower three chips H, M and L are “000000”, and discriminating which group between a first group and a second group the upper/lower data values belong to if the upper/lower data values are not“000000”. The LUT control device provides upper or lower LUT values to the adders using the upper or lower LUT values as they are, or converts the upper or lower LUT values into 2's complements and provides the converted values to the adders according to the discriminated first or second group.

REFERENCES:
patent: 7185036 (2007-02-01), Wang et al.
patent: 2002/0067765 (2002-06-01), Lim et al.
patent: 2003/0067973 (2003-04-01), Lee et al.
patent: 100294541 (2001-04-01), None
Sun Young Hwang, Jong Kwan Choi, Sil Kim, Design of an Area-Efficient Interploated FIR filter Based on LUT Partitioning, 2000, Telecommunications review vol. 10, No. 5, 1049-1058.
F. Adachi and M. Sawahashi, Wideband Multi-rate DS-CDMA for Next Generation Mobile Communications Systems, 1997, Wireless Communications Conference, 57-62.
Kaveh Pahlavan, et al.; “Voice-Band Data Communication Modems—A Historical Review: 1919-1988”; IEEE Communications Magazines; vol. 26; No. 1; Jan. 1988; pp. 16-27.

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