Without the use of channel access methods, it would be very difficult for telecommunication device companies to provide a level of series. FDMA and TDMA both are technologies that are used before the 3G network technology launched. These technologies utilized to improve the performance of the 2G network. So difference or comparison between these two is needed to know. Let us check the difference between them one by one given below. First, let us check it out the full form of FDMA and full form of TDMA
FDMA :
FDMA :
- FDMA stands for frequency division multiplexing.
- FDMA has lesser power efficiency.
- Only one terminal can be active only in one cell or one sector.
- It has a continuous transmission scheme.
- It requires higher carrier frequency stability.
- It is not required synchronization.
- Cell capacity depends upon the cell area.
- It has divided the frequency band into some disjoint sub-band.
- Difficult to power monitoring.
- It is used GSM and PDC.
- FDMA is simply idle when the channel is not used.
- Analog link is suitable for FDMA.
- In FDMA bandwidth is relatively narrow.
- Tight filtering is needed to minimize interference.
- Combined with FDD for duplexing.
- No equalization is needed for spreading symbol time.
TDMA :
- TDMA stands for time division multiple access.
- TDMA has more power efficiency.
- All terminal is active for a short term period of time on the same frequency.
- It has a discontinuous transmission scheme.
- The higher carrier frequency is not necessary.
- It requires synchronization.
- Limited cell capacity.
- It has total divided time into a non-overlapping time slot.
- Easy power monitoring.
- It is used for advanced mobile phone systems.
- All slot are assigned cyclically.
- And also have all slots are assigned on demand.
- Handoff is made simpler by using the non-continuous transmission
- It is essential to use digital data and also uses a modulation system.
- Overhead tradeoffs are the size of data payload and latency.
- Transmission system is allowed for only one user in a given slot.
- Multiple users share with a single carrier frequency.
- Data rate overhead is between 20 to 30 %.
- When reduced inter-user interference, power control is less stringent.
- Also, GSM uses TDMA in combination with FDMA. its a one types of advantages of TDMA
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