Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels
Reexamination Certificate
2005-12-21
2010-11-30
Pham, Chi H. (Department: 2471)
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via time channels
C370S203000, C370S465000
Reexamination Certificate
active
07843972
ABSTRACT:
In an OFDM transmission method, in order to compensate any frequency response variation time wise resulted from any distortion in a transmission path, out-of-synchronization with passage of time, frequency drift, and phase shift, and to improve a demodulation characteristic, a PS detector in a receiver receiving an OFDM signal detects a pilot symbol. A PS1 TPFR calculator calculates a frequency response of the transmission path for a first pilot symbol, while a PS2 TPFR calculator calculates a frequency response of the transmission path for a second pilot symbol. Thereafter, a compensation vector calculator calculates compensation vectors from the frequency responses of the transmission path for both the first and second pilot symbols by linear approximation. A frequency response compensator compensates the frequency response variation of subcarriers in a data symbol based on the calculated compensation vectors.
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Harada Yasuo
Kimura Tomohiro
Nakahara Hideki
Shirakata Naganori
Tanaka Koichiro
Panasonic Corporation
Pham Chi H.
Wenderoth , Lind & Ponack, L.L.P.
Wong Warner
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