Pulse or digital communications – Spread spectrum – Time hopping
Reexamination Certificate
2006-07-25
2006-07-25
Tse, Young T. (Department: 2637)
Pulse or digital communications
Spread spectrum
Time hopping
C375S130000, C375S239000, C370S347000, C332S112000
Reexamination Certificate
active
07082153
ABSTRACT:
Methods and systems for generating a variable spacing pulse position modulated (VSPPM) signal for transmission across an ultra-wideband communications channel. The variable pulse position modulated spread spectrum signal is created by encoding every M input data bits from an input data stream into a symbol consisting of Ncchips. Each chip is divided into 2Msub-chips and each sub-chip is further divided into Nptime slots. A pulse is transmitted for each chip in the symbol. During each chip period, the pulse is placed in the sub-chip corresponding to the binary M-tuple (or symbol) value. A time hopping code sequence consisting of Ncelements with a one-to-one chip association is then applied to each symbol so that the position of each pulse is shifted to the appropriate time slot that corresponds to the time hopping code value.
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Balachandran Krishna
Calin Doru
Ji Tingfang
Kang Joseph H.
Lucent Technologies - Inc.
Tse Young T.
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