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Advantages of DSSS | disadvantages of DSSS

This page covers advantages and disadvantages of DSSS. It mentions DSSS advantages or benefits and DSSS disadvantages or drawbacks. It also describes DSSS basics.

What is DSSS?

• The term DSSS is the short form of Direct Sequence Spread Spectrum.
• In this technique, information bits are modulated using PN codes as shown by PRS (Pseudonoise Random Sequence) generator.
• PN code has shorter duration compare to information bits and hence modulated spectrum occupies larger bandwidth.
• Information bits are spread across both time and frequency planes.
• DSSS delivers capacity of about 11 Mbps.
• It is very sensitive technology.
• It is used for point to point scenario.

DSSS Transmitter Receiver Block Diagram

The figure-1 depicts DSSS transmitter and DSSS receiver block diagrams.

Benefits or advantages of DSSS

Following are the benefits or advantages of DSSS:
➨It uses both time and frequency planes for transmission of information bits, effect of interference and fading can be minimized to great extent.
➨It can be employed in point to point applications at the rate of 11 Mbps.
➨It supports higher coverage range due to low SNR requirement at receiver.

Drawbacks or disadvantages of DSSS

Following are the disadvantages of DSSS:
➨It is very sensitive technology in the presence of harsh environments such as collocated cells, larger coverage areas, multipath and in the presence of frequencies used for bluetooth network. This is due to the fact that it operates at narrow bandwidth.
➨The system is prone to errors at lower level than FHSS.

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