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Moreover, for a given noise power spectral density (PSD), spread-spectrum systems require the same amount of energy per bit before spreading as narrowband systems and therefore the same amount of power if the bitrate before spreading is the same, but since the signal power is spread over a large bandwidth, the signal PSD is much lower — often ...
In 2013, the album Silent Spread Sound Spectrum was released on the Society of Sound – a subscription based music retail project by Bowers & Wilkins audio equipment company. Subscribers receive two albums per month curated by Peter Gabriel and the London Symphony Orchestra .
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In the US, FCC part 15 on unlicensed spread spectrum systems in the 902–928 MHz and 2.4 GHz bands permits more power than is allowed for non-spread-spectrum systems. Both FHSS and direct-sequence spread-spectrum (DSSS) systems can transmit at 1 watt, a thousandfold increase from the 1 milliwatt limit on non-spread-spectrum systems.
This installation was at the Gallery from 12 March to 7 May 2006. It was installed in December 2007 at the Wolfsonian Museum in Miami Beach, FL, and again at 3-Legged Dog in New York City, where it was used to accompany a play about Antheil and Hedy Lamarr, and their invention of spread-spectrum technology, called Frequency Hopping. [18]
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CDMA is a spread-spectrum multiple-access technique. A spread-spectrum technique spreads the bandwidth of the data uniformly for the same transmitted power. A spreading code is a pseudo-random code in the time domain that has a narrow ambiguity function in the frequency domain, unlike other narrow pulse codes. In CDMA a locally generated code ...
Direct-sequence spread-spectrum transmissions multiply the symbol sequence being transmitted with a spreading sequence that has a higher rate than the original message rate. Usually, sequences are chosen such that the resulting spectrum is spectrally white. Knowledge of the same sequence is used to reconstruct the original data at the receiving ...