Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2007-11-06
2007-11-06
Kim, Kevin (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C375S299000, C375S365000, C370S203000, C370S514000
Reexamination Certificate
active
10891613
ABSTRACT:
A method for generating a preamble sequence in an OFDM (Orthogonal Frequency Division Multiplexing) communication system that uses A sub-carriers in a frequency domain and uses N Tx (Transmission) antennas, includes the steps of: generating N sequences, each having a length of ‘B/N’, by dividing B sub-carriers from among the A sub-carriers by the ‘N’ indicative of the number of the Tx antennas; and mapping, for each of the N sequences, individual components of the sequence to the B/N sub-carriers from among the A sub-carriers on a one by one basis in order to assign the components of the sequence to the B/N sub-carriers, and assigning null data to remaining sub-carriers other than the B/N sub-carriers from among the A-sub-carriers, such that a preamble sequence of a corresponding Tx antenna is generated.
REFERENCES:
patent: 7233625 (2007-06-01), Ma et al.
Larsson et al, “Preamble Design for Multiple-Antenna OFDM-Based WLANs With Null Subcarriers,” 2001, IEEE, vol. 8, No. 11, pp. 285-288.
Chae Chan-Byoung
Choi Ho-Kyu
Daniel Katz Marcos
Hwang Chan-Soo
Suh Chang-Ho
Kim Kevin
Samsung Electronics Co,. Ltd.
The Farrell Law Firm
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