Pulse or digital communications – Pulse width modulation
Reexamination Certificate
2007-11-13
2007-11-13
Kim, Kevin (Department: 2611)
Pulse or digital communications
Pulse width modulation
C375S253000
Reexamination Certificate
active
10683405
ABSTRACT:
The invention relates to a transmission method for transmitting data symbols to or from users of an ultra bandwidth telecommunication system, each user (u) of said system being associated with a specific time hopping pattern consisting of a plurality (Ns, Nb) of integers (cju), the signal transmitted to or from a user consisting of sequences of the same plurality of frames, each integer of said pattern being associated with a corresponding frame and each frame containing a pulse time-shifted from the beginning thereof by an amount (cjuTc) determined by said associated integer, the pulses of one sequence being further position modulated by one or a plurality (nb) of data symbols to be transmitted to or from said user. According to the transmission method of the invention, the time at which a sequence of a user is transmitted is obtained from a pseudo-random sequence specific to said user. The invention equally relates to the corresponding transmitter.
REFERENCES:
patent: 6226282 (2001-05-01), Chung
patent: 2004/0057500 (2004-03-01), Balachandran et al.
patent: WO 01/97396 (2001-12-01), None
Ramirez-Mireles F., XP001103037, “Performance of Ultrawideband SSMA Using Time Hopping and M-Ary PPM”; IEEE Journal on Selected Areas in Communication, IEEE Inc. New York, US, vol. 19, No. 6, Jun. 2001: pp. 1186-1196.
Win M. Z. et al., XP000932191, “Ultra-Wide Bandwidth Time-Hopping Spead-Spectrum Impulse Radio for Wireless Multiple-Access Communicatiom”, IEEE Transactions on Communications, IEEE Inc. New York, US, vol. 48, No. 4, Apr. 2000, pp. 679-691.
Tomaso Erseghe, et al.; “Ultra Wide Band Pulse Communications”; Thesis Study at the Universita Degli Studi Di Padova; pp. 1-144; Apr. 1999 to Dec. 2001.
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