The transmitter and receiver change predetermined frequencies at the same time (in a synchronized manner).
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http://www.comptechdoc.org/independent/networking/cert/netterms.html
A simple form of spread spectrum where the transmitted signal is changed periodically in an pseudo-random pattern across a wide range frequencies in the radio spectrum. One of the advantages of this is to produce frequency diversity. Where the baseband signal is modulated directly onto the carrier then this is direct sequence spread spectrum, as used in CDMA (code division multiple access). Where the spreading is separated from the modulation then process is indirect as in OFDM (orthogonal frequency division multiplexing) and in the frequency hopping which is supported by GSM.
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Found on
http://www.encyclo.co.uk/visitor-contributions.php
Frequency Hopping A technique used to prevent readers from interfering with one another. In the United States, UHF RFID readers actually operate between 902 and 928 MHz, even though it is said that they operate at 915 MHz. The readers may jump randomly or in a programmed sequence to any frequency between 902 MHz and 928 MHz. If the band is wide e...
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http://www.wordinfo.info/words/index/info/view_unit/3991/5
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