Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2005-07-05
2005-07-05
Le, Amanda T. (Department: 2634)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C375S295000
Reexamination Certificate
active
06914942
ABSTRACT:
A method and an apparatus are provided in this invention to select an optimal swapping technique in discrete multi-tone system. The algorithm for performing gain-swapping is also proposed in the present invention. A swapping technique is selected from gain-swapping and a combination of bit-swapping and gain-swapping based on two index values such that the difference between the maximum mean square error (MSEmax) and the minimum mean square error (MSEmin) is minimized and the gain factor constraints are met. The first index value I is representative of range of improvement when adopting the gain-swapping as the swapping technique, and the second index value J is representative of range of improvement when adopting a combination of the gain-swapping and the bit-swapping as the swapping technique.
REFERENCES:
patent: 5265151 (1993-11-01), Goldstein
patent: 5479447 (1995-12-01), Chow et al.
patent: 2001/0031014 (2001-10-01), Subramanian et al.
patent: 2002/0048334 (2002-04-01), Hasegawa
patent: 2002/0131440 (2002-09-01), Tonissen et al.
Huang Hsien-Chun
Tsai Shang-Ho
Tzou Ching-Kae
Le Amanda T.
Nixon & Peabody LLP
Silicon Integrated Systems Corporation
Studebaker Donald S.
Williams Lawrence B.
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