scholarly journals Two-Layer Carrier Index Modulation Scheme Based on Differential Chaos Shift Keying

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 56433-56444 ◽  
Author(s):  
Wenhao Dai ◽  
Hua Yang ◽  
Yurong Song ◽  
Guoping Jiang
Keyword(s):  
Modulation Scheme ◽  
Shift Keying ◽  
Chaos Shift Keying ◽  
Index Modulation ◽  
Differential Chaos Shift Keying

A NEW DATA RATE ADAPTION COMMUNICATIONS SCHEME FOR CODE-SHIFTED DIFFERENTIAL CHAOS SHIFT KEYING MODULATION

2012 ◽  
Vol 22 (08) ◽  
pp. 1250201 ◽  
Author(s):  
W. K. XU ◽  
L. WANG ◽  
G. KOLUMBÁN
Keyword(s):  
Gaussian Approximation ◽  
Time Slot ◽  
Data Rate ◽  
Modulation Scheme ◽  
Noise Performance ◽  
Walsh Code ◽  
Shift Keying ◽  
Multilevel Modulation ◽  
Chaos Shift Keying ◽  
Differential Chaos Shift Keying

In a binary Transmitted Reference (TR) system each bit is encoded into two wavelets of finite duration. The information is transmitted by the sign of correlation measured between the two wavelets. The Code-Shifted Differential Chaos Shift Keying (CS-DCSK) modulation scheme transmits the two wavelets in the same time slot and applies two Walsh code sequences to keep the wavelets separated. The CS-DCSK modulation scheme is generalized here by transmitting more than one information bearing wavelets with one reference. The orthogonality of wavelets is assured by different Walsh code sequences. The new Generalized CS-DCSK (GCS-DCSK) scheme is a multilevel modulation where the symbol period is kept constant but the data rate can be varied in an adaptive manner by adding new or removing existing information bearing wavelets, each of them is isolated by Walsh code. Exploiting the Gaussian approximation, an analytical expression is derived for the noise performance of GCS-DCSK modulation. Its accuracy is verified by computer simulation.

A NOVEL DIFFERENTIAL CHAOS SHIFT KEYING MODULATION SCHEME

2011 ◽  
Vol 21 (03) ◽  
pp. 799-814 ◽  
Author(s):  
W. K. XU ◽  
L. WANG ◽  
G. KOLUMBÁN
Keyword(s):  
Fading Channels ◽  
Additive White Gaussian Noise ◽  
Cmos Technology ◽  
Ultra Wideband ◽  
Modulation Scheme ◽  
Delay Lines ◽  
Shift Keying ◽  
Delay Component ◽  
Chaos Shift Keying ◽  
Differential Chaos Shift Keying

In binary Differential Chaos Shift Keying (DCSK), the reference and information bearing chaotic wavelets are transmitted in two consecutive time slots. This TDMA approach provides two independent channels for the transmission of reference and information bearing wavelets but requires a delay component both in the modulator and demodulator circuits, furthermore, it halves the data attainable data rate. The wideband Radio Frequency (RF) delay lines at receiver are extremely difficult to implement with CMOS technology, therefore, the DCSK modulation cannot be exploited in many applications, such as ultra-wideband. To avoid the use of wideband RF delay lines at receiver, an alternative solution is proposed here where both the reference and information bearing wavelets are sent in the same time slot. The two wavelets are separated by Walsh codes instead of time delay. The new modulator and demodulator configurations are given, analytical expressions for the Bit Error Rate (BER) are derived and the derived BER expressions are verified by computer simulations over Additive White Gaussian Noise (AWGN) and multipath Rayleigh fading channels.

An $M$ -Ary Orthogonal Multilevel Differential Chaos Shift Keying System With Code Index Modulation

2019 ◽  
Vol 67 (7) ◽  
pp. 4835-4847 ◽  
Author(s):  
Xiangming Cai ◽  
Weikai Xu ◽  
Deqing Wang ◽  
Shaohua Hong ◽  
Lin Wang
Keyword(s):  
Shift Keying ◽  
Chaos Shift Keying ◽  
Index Modulation ◽  
Differential Chaos Shift Keying
Sign in / Sign up

Export Citation Format

Share Document