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Home » Terms Used in Bluetooth Wireless Technology » Frequency Hopping

Frequency Hopping (Selection)
Frequency Hopping (Selection) is a process of transferring radio signals among multiple frequency channels. Frequency Hopping (Selection) is a kind of blue tooth technology, which uses spread-spectrum signal transmission. The spread-spectrum signal has various advantages. Spread-spectrum signals resists interference of narrow band. Spread-spectrum transmissions share frequency band with various types of transmissions having minimal interference. The advantage is that spread-spectrum signals add minimum noise to small frequency communications for which the bandwidth can be used effectively. Get comprehensive insight on Frequency Hopping (Selection) from the pages of bluetoothxl.com.
Frequency Hopping (Selection) can be used effectively in military purpose. The radios used in military adopt cryptographic techniques to operate channels by the aid of a secret Transmission Security Key (TRANSEC) that the sender and receiver shares only. The military radios in the United states use frequency hopping technologies like SINCGARS and HAVE QUICK.

Frequency Hopping (Selection) exempts from the negative effects and degradation caused by narrow band interferes. The bandwidth used in frequency hopping is much more than that of carrier frequency. The interference bandwidth remains the same as transmission occurs on a small part of this bandwidth.

In Frequency Hopping (Selection) a sync with the transmitter and receiver is to be maintained. The transmitter can use all the channels in a specific time period. The receiver can communicate with the transmitter by choosing a channel and taking up a valid data on that channel. The transmitter's data is a data with special synchronization. Multiple transmissions can be possible in a same frequency in a multipoint radio system. Directional antennas and beam steering increase the standard and performance of signals through isolation between radios in remote areas.

Adaptive Frequency- Hopping spread spectrum or AFH is a kind of Frequency hopping (Selection) that is exclusively used in Bluetooth. It enhances radio frequency by avoiding crowded frequencies in hopping format. This is kind of adaptive transmission that is easier to implement in FHSS. In AFH frequencies hop only in the good ones and the frequency channels that gets interference from transmitter are avoided. Implementation of AFH enables in tracing out the good and bad channels.

In dynamic interference of radio frequency the plan removing bad channels does not become applicable. The problem arises in various chunked frequency-hopping networks like Bluetooth Piconet. Here the frequencies interfere leading to the failing of mechanism of AFH. Here the strategy of dynamic adaptation is to be adopted for frequency hopping . This can generally in areas of Unlicensed spectrum. Dynamic radio frequency interference occurs mostly in Cognitive radio, due to the frequency-agile techniques of the networks and the devices. Chirp Modulation is another kind of frequency hopping techniques. Here the available frequencies that are hopped are scanned in sequential order.

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