What are the advantages and disadvantages of DSSS technique?

What are the advantages and disadvantages of DSSS technique?

➨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.

What is advantage of DSSS over FHSS?

DSSS, in contrast, spreads the signal across a wider bandwidth than FHSS, creating a lower power density across the spectrum. DSSS encodes each bit of data into 11-chip sequences, which provide both security and robustness against noise.

What is the main disadvantage of frequency hopping SS FHSS )?

There are some of the disadvantages of Frequency hopping spread spectrum (FH-SS) given below : It needs complex and costly digital frequency synthesizers are required to be used. It needs error detection. The processing gain is higher than that of a direct sequence spread spectrum.

What are the disadvantages of DS SS?

Disadvantages of DS/SS : It require wideband channel with small phase distortion. The pseudo noise generator must generate sequence at high rates. Near-far problem. Fast code generator needed.

What is the difference between slow and fast FHSS?

In slow frequency hopping, multiple symbols are transmitted in one frequency hop. In fast frequency hopping, multiple hops are required to transmit one symbol. One or more symbols are transmitted over the same carrier frequency.

What is FHSS technique?

Frequency-hopping spread spectrum (FHSS) is a method of transmitting radio signals by rapidly changing the carrier frequency among many distinct frequencies occupying a large spectral band. FHSS is used to avoid interference, to prevent eavesdropping, and to enable code-division multiple access (CDMA) communications.

What is spread spectrum Technology explain the FHSS and DSSS techniques for spreading the spectrum?

What is FHSS technology?

FHSS is a wireless technology that spreads signals over rapidly changing frequencies. Each available frequency band is divided into subfrequencies, and signals rapidly change, or “hop,” among these subfrequency bands in a pre-determined order.

Why is Dsss used?

In telecommunications, direct-sequence spread spectrum (DSSS) is a spread-spectrum modulation technique primarily used to reduce overall signal interference. The direct-sequence modulation makes the transmitted signal wider in bandwidth than the information bandwidth.

What is the difference between FHSS and DSSS?

➨As FHSS relies on carrier frequencies to transmit information bits, it leads to strong bursty errors due to frequency selective fading mainly. ➨It supports lower data rate of 3 Mbps compare to 11 Mbps supported by DSSS. ➨It supports lower coverage range due to high SNR requirement at receiver.

What are the disadvantages of FHSS?

It can be programmed to avoid some portions of spectrum . FHSS needs shorter time for acquisition. Very large bandwidth. It is need complex frequency synthesizers. Not useful for range and range rate measurements. It requires error correction. Wireless local area networks (WLAN) standard for Wi-Fi .

What are the advantages of DSSS over FHSS over pseudo noise generator?

It avoids intentional interference such as jamming effectively. Performance of DSSS system in presence of noise is better than FHSS system. This system becomes slow due to large acquisition time. It requires wideband channel with small phase distortion. The pseudo noise generator should generate sequence at high rates.

What are the advantages and disadvantages of direct sequence spread spectrum?

There are some advantages of direct sequence spread spectrum which are given below, It has best discrimination against multipath signals. It avoids intentional interference such as jamming effectively. Performance of DSSS system in presence of noise is better than FHSS system.