Comparison – FDMA, TDMA and CDMA

S.No

Parameter

FDMA

TDMA

CDMA

1.

Data Rates

Low

Medium

High

2.

Mode of Data

Continuous Signal

Signal in bursts

Digital Signal

3.

Capacity of the system

Low

Medium

Large

4.

Cost

High

Low

Installation cost is high but operating cost is lowest.

5.

Handoff

Hard

Hard

Soft

6.

Flexibility

Low

Moderate

High

7.

Technique

Sharing of overall bandwidth of satellite transponder

Sharing of time of the satellite transponder

Sharing of bandwidth and time both

8.

Synchonization

No synchronization is required.

Time synchronization is essential.

No synchronization is required.

9.

Code Word

No code word is required.

No code word is required.

Code words are required by the ground station.

10.

Power efficiency

Power efficiency is reduced.

Full power efficiency is possible.

Full power efficiency is possible.

11.

Guard times and Bands

Guard Bands are required.

Guard Times are required.

Both guard times and bands are required.

12.

Interference Effects

Adjacent frequency bands interference generated because of nonlinearity of satellite transponder amplifier.

Interference between the user of adjacent time slots is generated because of incorrect synchronization.

Performance is affected because of adjacent time and frequency slots. But effect is less due to frequency hopping.

13.

Variable Transmission Rate

Difficult

Easy

Easy

14.

Near-far Problem

No

No

Yes

15.

Fading Mitigation

Equalizer not needed

Equalizer may be needed

RAKE receiver possible

PICTORIAL REPRESENTATION:

  1. FDMA:fdma
  2. TDMA:tdma
  3. CDMA:cdma

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