Patent ID: 8374280
Filing Date: 2013-02-12
Classification: H04B

Abstract:
1. An ultra-wide-band pulse generator, comprising: a generator suitable for transmitting digital data arranged in groups of information elements, each element comprising a value encoded in a pulse train during time intervals reciprocal of an encoding frequency, the pulse train obtained by modulating a signal from an oscillator having a base frequency at least equal to three times the encoding frequency, a modulator connected to the oscillator and operable to modulate the pulse train by applying the oscillating signal over each time interval, the modulation depending at least on the value of the information element to be encoded during each time interval, an addressing circuit and an encoding table, the addressing circuit having a configuration of information elements including at least one information element encoded previously and at least one unencoded information element, the encoding table connected to the addressing circuit and including at least four series of digital words, each word representing an amplitude encoded on at least two bits, the encoding table operable to sequentially provide, during each time interval, digital words selected from a series of digital words in the encoding table depending on the configuration of information elements contained in the addressing circuit, wherein the modulator comprises an amplitude modulator that includes a digital control amplifier, the gain of which is controlled by the digital words provided by the encoding table, and the series of digital words selected over each time interval by the encoding table being encoded by different respective amplitude changes, the different events formed by an identity and by a dissimilarity of the information elements of the configuration contained in the addressing circuit, as a result of which the passband of the pulses delivered by the generator is reduced, and wherein each series of digital words comprises a number of words equal to the integer ratio of the base frequency to the encoding frequency.