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Frequency-hopping spread spectrum (FHSS) is a method of transmitting radio signals by rapidly changing the carrier frequency among many frequencies occupying a large spectral band. The changes are controlled by a code known to both transmitter and receiver .
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 ...
US Patent 8686702, filed in 2012, "Negative slope compensation for current mode switching power supply". [9] US Patent 10637254, filed in 2015, "Spread spectrum for switch mode power supplies". [10] US Patent 9866245, filed in 2016, "Active differential resistors with reduced noise". [11]
Mortimer Alan Rogoff (May 2, 1921 – August 1, 2008) was an American inventor, businessman, and author as well as an amateur photographer and radio operator. He is recognized for his work in spread spectrum technology which is the technology that modern cell phones and GPS systems are based on.
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 ...
The patent filing date in Switzerland was January 29, 1942. The corresponding U.S. patent 2,405,500 Means for and method of secret signaling was granted in 1946. [3] In the Spread Spectrum Communications Handbook by M.Simon et al., [4] Guanella is referred to as Swiss pioneer of noise-modulated radar and speech privacy systems. DSSS is of ...
Nevada-based biotech Spectrum Pharmaceuticals (NAS: SPPI) announced today that the U.S. Patent and Trademark Office granted a five-year extension on patent protection for its drug Folotyn. The ...
Carrier Interferometry (CI) is a spread spectrum scheme designed to be used in an Orthogonal Frequency-Division Multiplexing (OFDM) communication system for multiplexing and multiple access, enabling the system to support multiple users at the same time over the same frequency band.