What is carrier tracking loop?

The carrier tracking loop performs the task of aligning the local generated carrier with the incoming signal while the code tracking loop ensures the time alignment of the local generated codes.

What is the function of NCO in code tracking loop?

NCO: Numerical Control Oscillators convert the filter outputs into usable correction factors of Doppler frequency and code delay, which are fed back to the Doppler removal and Local code Generators blocks respectively, as shown here.

How does a delay locked loop work?

The delay-locked loop (DLL) is a circuit fed by a reference clock that attempts to find the period of that reference clock by adjusting the delay of a variable delay buffer in a feedback loop. The loop is locked when the delayed clock signal matches the incoming clock signal.

What is difference between DLL and PLL?

The main difference between DLL and PLL is that DLL does not have a voltage-controlled oscillator while PLL has. Instead, DLL has a delay line and it can self-regulate its delay line. Also, DLL is preferred over PLL as DLL is less subjected to errors as compared to PLL.

Why delay locked loop is used?

A DLL can be used to change the phase of a clock signal (a signal with a periodic waveform), usually to enhance the clock rise-to-data output valid timing characteristics of integrated circuits (such as DRAM devices). DLLs can also be used for clock recovery (CDR).

What is loop filter in PLL?

Loop filter: This filter is used to filter the output from the phase comparator in the phase locked loop, PLL. It is used to remove any components of the signals of which the phase is being compared from the VCO line, i.e. the reference and VCO input.

What is DLL in analog?

The delay locked loop is a variable delay line whose delay is locked to the duration of the period of a reference clock. Depending on the signal processing element in the loop (a flat amplifier or an integrator), the DLL loop can be of 0th order type 0 or of 1st order type 1.

What is CTS stands for?

CTS

Acronym	Definition
CTS	Change Tracking System
CTS	Computerized Telephone System
CTS	Collective Training System
CTS	Common Transfer System (UK schools)

What is the difference between code tracking loop and carrier tracking loop?

While code tracking loops follow the code delay of the incoming signal using Delay Lock Loops (DLL), carrier tracking loops can be designed to follow either the phase of the incoming signal – using Phase Lock Loops (PLL), or the Doppler frequency of the incoming signal using Frequency Lock Loops (FLL).

What is the purpose of tracking loop?

For that purpose, tracking loops are used in a closed loop to follow continuously the code and carrier parameters of the incoming signal. These loops are often designated as code and carrier tracking loops.

What are the different types of tracking loops in a receiver?

There are code tracking loops, the delay lock loops (DLL) and carrier tracking loops, and the phase locking loops (PLL) in the receiver. Typically, both the code and the carrier are being tracked in phase lock.

Is the carrier being tracked in phase lock?

Typically, both the code and the carrier are being tracked in phase lock. The tracking loops connected to each of the receiver’s channels also work cooperatively with each other.