Explain: a.) Synthesised Frequency Hopping, b.) Base Band Frequency Hopping, c.) Cycling Frequency Hopping

Explain: a.) Synthesised Frequency Hopping, b.) Base Band Frequency Hopping, c.) Cycling Frequency Hopping

a.) Synthesised Frequency Hopping

- The GSM’s number of frequencies is 124
- When the operators do not have enough frequencies, the range to be used is CDS 1800
- Frequency hopping is used when the frequencies used are more with high interference.
- Frequency hopping is utilized to equalize interference for the frequencies that are used in their range.
- One of the frequency hoppings is Synthesised Frequency Hopping.
- Synthesized hopping allows the transmitter to change its frequency based on time slots. Because of this process SFH is known as fast hopping.

b.) Base Band Frequency Hopping

- Base Band Frequency Hopping is one of the frequency hopping techniques.
- Time division multiplexing mapping is used in BBFH
- BBFH is supported by a base station having a broadband transceiver
- Physical channels are permitted by BBFH based upon mobile subscribers’ communication with the base station.
- In this, static transceiver frequencies are used while operating with broadband transceiver. This method is an exclusive of switching communication signals between transceivers.

c.) Cycling Frequency Hopping

- In Cycling Frequency Hopping, the frequencies are changed, in every TDMA frame.
- For ex: f1,f2,f3 …. Where f1,f2,f3 are frequency hopping sequence numbers
- The specified setting parameter is HSN.
- Hopping Sequence Number is set to 0 in a cyclic sequence hopping
- The sequence of frequencies starts from the lowest absolute frequency number in a set of frequencies specified for a specific channel group, to highest absolute frequency number.