Fast carrier recovery in FHSS systems with DDS based Costas loop
Journal Title: Elektronika - Year 2015, Vol 19, Issue 1
Abstract
Owing to fast change of carrier frequency, the usage of coherent demodulation methods in Frequency-Hopping Spread Spectrum (FHSS) communication systems is limited by the coherent state acquisition performed by the local oscillator. To get around this difficulty, it is needed to implement the circuit within the FHSS system that is able to rapidly generate a coherent carrier. The work presented in this paper proposes a realization of Costas loop based on a combination of Direct Digital Synthesis (DDS), (Temperature-Compensated) Voltage Controlled Oscillator ((TC)VCXO), and Phase-Locked Loop (PLL), which in particular enables a short period (less than 100 μs) required for a local oscillator to reach the coherent state. The implemented model is thoroughly described with measurements results also provided.
Authors and Affiliations
Slavko Šajić
Keywords
Related Articles
- EP ID EP362624
- DOI 10.7251/ELS1519003S
- Views 78
- Downloads 0
Study on a Composite Patch Antenna Based on Left Handed Material with Near Zero Index
In this paper, a composite patch antenna based on left handed material (LHM) with near zero index (NZI) is presented. This composite patch antenna is designed by assembling split resonant rings (SRRs) and metal strips on...
Operational Transconductance Amplifier in 350nm CMOS technology
This paper presents transistor level design of operational transconductance amplifier in CMOS technology. Custom designed, circuit is to be built-in into the mixed-signal, switched capacitor circuit. Amplifier targets re...
An Improved Design of Gallager Mapping for LDPC-coded BICM-ID System
Gallager mapping uses different signal points with different probabilities by assigning several labels for one signal point, and thus provides a promising approach to achieving shaping gains. An important issue in Gallag...
Amplitude Malformation in the IFFT Ocean Wave Rendering under the Influence of the Fourier Coefficient
Although Tessendorf’s IFFT Gerstner wave model has been widely used, the value of A, a constant of the Fourier coefficient, is not given. A will strongly influence the shape of the rendered ocean wave and even cause ampl...
New Blood Level Measurement System in Blood Separating Machine
Standard versions of blood separators typically use medium-price color sensors for a detection of a boundary level between red blood cells and plasma, at the last gate – at hose clamps. Discrete number of sensors is rela...