In this chapter, the performance improvement obtained from phase modulation (PM) and filtering on return-to-zero (RZ) signal format at the transmitter is investigated. The primary purpose is to understand the mechanism of each type of PM that leads to performance improvement relative to the RZ signal format with no PM. Three types of phase modulation on an RZ pulse train are considered in this ...

A new technique of modulation index adjustment for pure wavelength modulation spectroscopy second harmonic signal waveforms recovery is presented. As the modulation index is a key parameter in determining the exact form of the signals generated by the technique of wavelength modulation spectroscopy, the method of modulation index adjustment is applied to recover the second harmonic signal with ...

A variety of digital watermarking applications have emerged recently that require the design of systems for embedding one signal (the “embedded signal” or “watermark”) within another signal (the “host signal”). We develop a framework for analyzing achievable performance trade-offs of these systems among robustness, distortion, and embedding rate. We also describe a recently introduced class of ...

In the field of musicians and recording engineers audio effects are mainly described and indicated by their acoustical effect. Audio effects can also be categorized from a technical point of view. The main criterion is found to be the type of modulation technique used to achieve the effect. After a short introduction to the different modulation types, three more sophisticated audio effect appli...

The parameter estimation of the frequency agility (FA) signal using the coding Nyquist folding receiver (CNYFR) is presented. The estimation algorithm adopting linear frequency modulation (LFM) as the local analogue modulation is derived. The Nyquist zone is estimated by the pseudo Wigner-Ville distribution (PWVD) and the hopping frequencies are calculated by the maximum likelihood (ML) method....

Classifications of digital modulation, the signal characteristics of the phase of the cycle will cause the phase wrapped and reduce overlapping signals in the received RF digital modulation automatically correct classification probability. According to the principle of minimum mean square, a phase modulation and phase modulation signal classification features as well as 2PSK and MPSK classifica...

OF THE MASTER’S THESIS Author: Gao Liang Title: Hierarchical MIMO modulation in digital TV transmission Date: September 2009 Number of pages: 76 Faculty: Electronics, Communications and Automation Professorship: S-72 Communications Engineering Supervisor: Professor Olav Tirkkonen It is possible to use hierarchical modulation in broadcast systems so that there are two different levels of service...

This paper presents a review of modulation techniques that target the best use of resources available in a communication system. These are referred to as efficient Modulation techniques. It proposes novelreceiver architecture for demodulating a DPSK/ASK orthogonally modulated signal. We can analysis the performance of these modulation techniques when the system is subjected to AWGN. These modul...

—The characteristics typical S-shaped Nonlinear Frequency Modulation (S-NLFM) signal are analyzed, and a detection method for this type of signal is also proposed. First of all, the instantaneous frequency of the S-NLFM signal based on sinusoid modulation and tangent modulation is obtained by phase unwrapping respectively. Then, two characteristics are obtained from instantaneous frequency. Co...

A terahertz-wave communication system directly connected to an optical fiber network is promising for application to future mobile backhaul and fronthaul links. The possible broad bandwidth in the terahertz band is useful for high-speed signal transmission as well as radio-space encapsulation to the high-frequency carrier. In both cases, the low-latency feature becomes important to enhance the ...