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What is the principle of frequency hopping spread spectrum?
Frequency-hopping spread spectrum (FHSS) is a method of transmitting radio signals by rapidly changing the carrier frequency among many distinct frequencies occupying a large spectral band. The changes are controlled by a code known to both transmitter and receiver.
Does WIFI use frequency hopping?
Wi-Fi uses Direct Sequence Spread Spectrum (DSSS) instead of FHSS. Its carrier does not hop or change frequency and remains centered on one channel that is 22 MHz-wide. While there is room for 11 overlapping channels in this 83 MHz-wide band, there is only room for three non-overlapping channels.
What is frequency hopping in 5g?
A key distinguishing characteristic of mmWave is its use of highly directional and steerable antennas. In addition, future networks will be highly densified through the proliferation of base stations and their supporting infrastructure.
What is fast frequency hopping?
Fast Frequency Hopping (FFH) One data bit is divided over multiple hops. In fast hopping, coherent signal detection is difficult, and seldom used. Mostly, FSK or MFSK modulation is used.
How does frequency hopping spread spectrum ( FHSS ) work?
Frequency Hopping Spread Spectrum (FHSS) derives from military radio technology, making it secure and reliable under adverse battle conditions. FHSS changes the frequency of a transmission at intervals faster than an intruder can re-tune a jamming device. With FHSS, it divides the bandwidth into multiple frequency channels.
How many hopping frequencies does powerg network have?
The network continuously hops between multiple frequencies spread over the entire assigned frequency band: 8 hopping frequencies in the 433-434MHz bands, 4 hopping frequencies in the 868-869MHz bands, and 50 hopping frequencies in the 912-918MHz bands.
What kind of encryption algorithm does powerg use?
The PowerG network employs the proven AES-128 (128 bit key) advanced encryption algorithm for correct message identification and for protecting the alarm system from code grabbing and from message substitution by hackers and other attackers. AES-128 uses 10 rounds with each round performing several transformations.
Which is an analogy for the AES encryption?
The AES encryption uses a single key which is a shared secret between the sender and receiver to encrypt and decrypt data. An analogy is a locked mailbox without a mail slot. Anybody who wants to leave or read a message needs to have a key to the mailbox.