What is synchronization in spread spectrum?

4.1 SYNCHRONIZATION The process of synchronizing the locally generated spreading signal with the received spread-spectrum signal is usually accomplished in two steps. The first step, called acquisition, consists of bringing the two spreading signals into coarse alignment with one another.

How do I get DSSS?

In DSSS system, spreading is accomplished by representing each bit of the original message sequence utilizing a few bits. This procedure is accomplished by utilizing a spreading code for this situation of a pseudo-noise (PN) sequence. The PN sequence is XOR-ed with the message sequence.

What are the two types of spread spectrum techniques?

There are two predominant techniques to spread the spectrum: 1) Frequency hoping (FH), which makes the narrow band signal jump in random narrow bands within a larger bandwidth. 2) Direct sequence (DS) which introduces rapid phase transition to the data to make it larger in bandwidth.

What are the principles used in spread spectrum?

The core principle of spread spectrum is the use of noise-like carrier waves, and, as the name implies, bandwidths much wider than that required for simple point-to-point communication at the same data rate. Resistance to jamming (interference).

What is acquisition and tracking?

The operation of GPS signal synchronization is achieved through two steps: acquisition and tracking. Acquisition is a two-dimensional search operation [I] , where the spreading CIA code phase and carrier Doppler shift are coarsely estimated simultaneously.

What is DSSS modulation?

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 DSSS and FHSS?

The DSSS method of modulation has a higher rate of transmission than the FHSS method. The implementation of DSSS at radio frequencies with a high transmission rate costs less than implementing FHSS. At a given transmitting power, FHSS offers higher power spectral density than DSSS.

What is spreading factor in DSSS?

One of the most essential attributes of DSSS coding is the spreading factor, which is defined as the quotient of the chip rate and the bit rate. As suggested by the above characteristics, DSSS does not affect the transmission time for the same transmitted packet.

What is spread spectrum & Types?

Spread Spectrum can be categorized into two types: Frequency Hopping Spread Spectrum (FHSS) Direct Sequence Spread Spectrum(DSSS)

Which technique is most popular for spread spectrum?

Direct sequence and frequency hopping are the most commonly used methods for the spread spectrum technology.

What is acquisition sensitivity?

What is Acquisition Sensitivity? Acquisition sensitivity represents the minimum power level at which a GNSS receiver can achieve a position fix. This is the minimum level to successfully perform TTFF under cold start.