Essence and Advantages of FM-DCSK Versus Conventional Spread-Spectrum Communication Methods

Abstract

Frequency-modulated differential chaos shift keying (FM-DCSK) is essentially a technique that combines modulation with a spread-spectrum property for communications. It is also an effective technique similar to recent multiantenna methodologies that can make use of multipath effects, thereby achieving an excellent anti-multipath fading capability. Through analysis and simulation, this paper reports some essential characteristics and advantages in the system performance of the newly proposed M-ary FM-DCSK technology. The basic design of the M-ary FM-DCSK-based chaotic spread-spectrum communication system and a comparison with its conventional equivalent are presented. It is shown that the former is not only robust in multipath fading environments and simple in implementation, but also flexible in adjusting system parameters and trading-off several effects among bandwidth efficiency, energy efficiency, data rate, and error performance. It is demonstrated that the FM-DCSK technique is promising for the next generation of wireless communication systems as an excellent modulation and spread-spectrum scheme candidate.

Performance Analysis of the CS-DCSK/BPSK Communication System

“…As a simple alternative spread-spectrum communication method [2], chaotic modulation has high robustness against multipath fading even in a severe multipath environment, thanks to its wideband power spectral characteristic and excellent auto-correlation and cross-correlation properties. Among all the chaotic modulation schemes, differential chaos shift keying (DCSK) [12] is proven not only requiring a simple transceiver but also achieving a strong anti-multipath fading capability [3].…”

A new user cooperative protocol based on code-shifted differential chaos shift keying modulation

“…The differential chaos shift keying (DCSK) technique offers excellent system performances in multipath time varying propagation environment [2]. It is an alterative simple solution to spread-spectrum (SS) communication since simple autocorrelation receiver (AcR) which can capture the entire signal energy without requiring the acquisition and synchronization of a spreading code and channel estimation [8]. Recently, an improved DCSK scheme, called code-shifted DCSK (CS-DCSK) which eliminated the delay circuits in AcR, is proposed [9].…”

Performance of FM-DCSK Communication Systems with Timing Synchronization Error

“…Alternatively, non-coherent detection is commonly employed in chaotic schemes, such as COOK, DCSK and FM-DCSK, to name just a few. Among them, FM-DCSK is proven not only having the best noise performance but also possessing a superior capability of anti-interference over multipath fading channels without the need of some compensatory measures such as channel estimation, equalization, or Rake reception [5]- [7].…”