Ultra-wideband high data-rate communications
View Patent ↗System and methods for generating ultra-wide band communication signal including: filtering a digital data pulse having a data clocking rate by mixing a filter-function pulse with the digital data pulse; generating a harmonic of a clock oscillator which appears as a center frequency of emission of frequency spread spectrum signal; and mixing the filtered digital data pulse with the harmonic of the clock oscillator signal, characterized in that the clock oscillator frequency, the data clocking rate, and the center frequency of signal emissions are harmonically related are disclosed.
1. A method for transmitting signal from an ultra wideband (UWB) transmitter, comprising:
generating a set of harmonics of a reference clock signal, wherein the generation of the set of harmonics is synchronized to the reference clock signal; generating a pseudo-random noise signal;
coding a set of data bits using the pseudo-random noise signal to generate a coded data signal, based on the reference clock signal;
modulating each of the set of harmonics of the carrier frequency using the coded data signal synchronously with the reference clock signal to generate a set of modulated harmonic signals;
transmitting each of the set of modulated harmonic signals;
wherein the pseudo-random noise signal corresponds to a ratio for a number of chips to each data bit of the set of data bits;
wherein the set of harmonics and a frequency of the reference clock signal are based on a power spectral density for the UWB transmitter;
wherein the power spectral density of the UWB transmitter at a frequency(f) is
p
n
=
2
nf
c
2
π
|
sin
(
π
f
f
c
)
f
2
-
(
nf
c
)
2
where f c represents the frequency of the reference clock signal and n represents approximately a center operating frequency of the UWB transmitter divided by one half of a desired bandwidth for the UWB transmitter;
wherein each of the set of harmonics are modulated such that one of the set of modulated harmonic signal corresponds to one of the set of data bits; and
wherein each of the set of harmonics are modulated such that one of the set of modulated harmonic signal corresponds to one of a set of chips, the set of chips corresponding to one of the set of data bits.
2. The method of claim 1 , wherein
n
=
⌈
f
o
Δ
f
2
⌉
where f o denotes the center operating frequency of the UWB transmitter and Δf denotes a desired bandwidth of the UWB transmitter.
3. An apparatus comprising:
an ultra wideband (UWB) transmitter operable to:
generate a set of harmonics of a reference clock signal, wherein the generation of the set of harmonics is synchronized to the reference clock signal; generate a pseudo-random noise signal;
code a set of data bits using the pseudo-random noise signal to generate a coded data signal, based on the reference clock signal;
modulate each of the set of harmonics of the carrier frequency using the coded data signal synchronously with the reference clock signal to generate a set of modulated harmonic signals;
transmit each of the set of modulated harmonic signals;
wherein the pseudo-random noise signal corresponds to a ratio for a number of chips to each data bit of the set of data bits:
wherein the set of harmonics and a frequency of the reference clock signal are based on a power spectral density for the UWB transmitter;
wherein the powers spectral density of the UWB transmitter at a frequency (f) is
p
n
=
2
nf
c
2
π
|
sin
(
π
f
f
c
)
f
2
-
(
nf
c
)
2
where f c represents the frequency of the reference clock signal and n represents approximately a center operating frequency of the UWB transmitter divided by one half of a desired bandwidth for the UWB transmitter;
wherein each of the set of harmonics are modulated such that one of the set of modulated harmonic signal corresponds to one of the set of data bits; and
wherein each of the set of harmonics are modulated such that one of the set of modulated harmonic signal corresponds to one of a set of chips, the set of chips corresponding to one of the set of data bits.
4. The apparatus of claim 3 , wherein
n
=
⌈
f
o
Δ
f
2
⌉
where f o denotes the center operating frequency of the UWB transmitter and Δf denotes a desired bandwidth of the UWB transmitter.