A comparative study of higher-order differential phase shift keying schemes over AWGN and Rayleigh fading channels

1995 ◽  
Vol 2 (3) ◽  
pp. 183-196 ◽  
Author(s):  
M. Samiuddin ◽  
Khaled H. Biyari
Keyword(s):  
Phase Shift ◽  
Comparative Study ◽  
Fading Channels ◽  
Rayleigh Fading ◽  
Higher Order ◽  
Rayleigh Fading Channels ◽  
Phase Shift Keying ◽  
Differential Phase Shift ◽  
Differential Phase Shift Keying ◽  
Shift Keying

scholarly journals Modulation diversity for differential amplitude and phase shift keying technique

2017 ◽  
Vol 7 (1.1) ◽  
pp. 418
Author(s):  
M Kanthimathi ◽  
R Amutha ◽  
S Anusha
Keyword(s):  
Phase Shift ◽  
Fading Channels ◽  
Differential Detection ◽  
Phase Shift Keying ◽  
Differential Phase Shift ◽  
Differential Phase ◽  
Differential Phase Shift Keying ◽  
Shift Keying ◽  
Modulation Diversity ◽  
Energy Consumption Simulation

Modulation diversity can reduce the bit error rate in fading channels. We make use of the advantage of modulation diversity in non-coherent differential modulation technique. Increase in modulation diversity is obtained by rotating signal constellation. Coordinate interleaved Differential amplitude and phase-shift keying modulation (DAPSK) is particularly advantageous compared to the Differential phase-shift keying (DPSK) technique. Energy optimization is done to minimize the energy consumption. Simulation results shows that the proposed differential detection for different rotation angle achieves better BER performance than constant phase differential detection with modulation diversity.The energy required to successfully transmit a bit is also reduced for proposed system compared to Differential phase shift keying based system.

Comparative Analysis of Gaussian Minimum Shift Keying and Binary Differential Phase Shift Keying Signalling Schemes with Maximal Ratio Combiner over Rayleigh Environment

2011 ◽  
Vol 367 ◽  
pp. 205-214
Author(s):  
Z.K. Adeyemo ◽  
R.O. Abolade
Keyword(s):  
Phase Shift ◽  
Mobile Communication ◽  
Rayleigh Fading ◽  
Diversity Combining ◽  
Phase Shift Keying ◽  
Differential Phase Shift ◽  
Differential Phase ◽  
Differential Phase Shift Keying ◽  
Gaussian Minimum Shift Keying ◽  
Shift Keying

This paper presents the investigation of two transmission schemes with a diversity combining technique over Rayleigh fading channels. Each of Gaussian Minimum Shift Keying (GMSK) and Binary Differential Phase Shift Keying (BDPSK) transmission schemes was considered with a diversity combining technique known as Maximal Ratio Combining (MRC). Rayleigh fading channel is used statistically to model the communication channel where there is no direct line of sight, which is the attribute of mobile communication. Mobile communication industry is faced with the problem of providing the technology that will be able to support a wide variety of services irrespective of distance, other signals interferences, noise, and objects in the medium of transmission. The system model for the received signal was developed using Jakes model under two propagation paths. The developed model was simulated based on the developed algorithms using MATLAB application package. Two different types of data, randomly generated symbols and image data, were used as the information signal. The results obtained showed that the GMSK scheme had higher average Bit Error Rate (BER) values than the corresponding BDPSK scheme which indicates better performance of BDPSK when the same numbers of bits were transmitted over this channel. Consequently, the quality of the images received with both signalling schemes was in agreement with the BER results. The results obtained showed that though GMSK scheme is comparatively more immune to noise and other interfering signals in this type of fading environment but BDPSK scheme has the advantage of feeding back the output signal to form differential with the input signal which invariably resulted in better average BER of the signal.

Packet Error Probability for Diversity Systems in Slow Rayleigh Fading and Gaussian Noise

1986 ◽  
Vol 23 (3) ◽  
pp. 239-244
Author(s):  
Matthew L. Luhanga
Keyword(s):  
Fading Channels ◽  
Gaussian Noise ◽  
Error Probability ◽  
Rayleigh Fading ◽  
Maximal Ratio Combining ◽  
Selection Combining ◽  
Phase Shift Keying ◽  
Differential Phase Shift ◽  
Differential Phase Shift Keying ◽  
Shift Keying

Analytical results on packet error probability for noncoherent frequency-shift-keying (NCFSK) and differential phase-shift-keying (DPSK) systems with diversity reception operating over slow Rayleigh fading channels with Gaussian noise are derived. Expressions obtained are applicable to two linear combining schemes: selection combining and maximal-ratio combining.

Performance Comparison between DPSK and OQPSK modulation approaches in multi environments channels with Matlab Simulink models

2019 ◽  
Vol 7 (1) ◽  
pp. 30-39
Author(s):  
Fatima faydhe Al- Azzawi ◽  
Faeza Abas Abid ◽  
Zainab faydhe Al-Azzawi
Keyword(s):  
Phase Shift ◽  
Fading Channels ◽  
Additive White Gaussian Noise ◽  
Block Codes ◽  
Performance Comparison ◽  
Phase Shift Keying ◽  
Differential Phase Shift ◽  
Matlab Simulink ◽  
Communication Industry ◽  
Shift Keying

Phase shift keying modulation approaches are widely used in the communication industry. Differential phase shift keying (DPSK) and Offset Quadrature phase shift keying (OQPSK) schemes are chosen to be investigated is multi environment channels, where both systems are designed using MATLAB Simulink and tested. Cross talk and unity of signals generated from DPSK and OQPSK are examined using Cross-correlation and auto-correlation, respectively. In this research a proposed system included improvement in bit error rate (BER) of both systems in  the additive white Gaussian Noise (AWGN) channel, by using the convolutional and block codes, by increasing the ratio of energy in the specular component to the energy in the diffuse component (k) and  the diversity order BER in the fading channels will be improved in both systems.    

Design and Performance Analysis of 2D OCDMA System with Polarization States

2016 ◽  
Vol 37 (4) ◽  
Author(s):  
Manisha Bharti ◽  
Ajay K. Sharma ◽  
Manoj Kumar
Keyword(s):  
Phase Shift ◽  
Polarization State ◽  
Phase Shift Keying ◽  
Modulation Formats ◽  
Differential Phase Shift ◽  
Differential Phase ◽  
Differential Phase Shift Keying ◽  
Shift Keying ◽  
Polarization States ◽  
Code Division Multiple

AbstractThis paper focuses on increasing the number of subscribers in optical code-division multiple access (OCDMA) system by using one of the features of light signal that it can be propagated in two polarization states. The performance of two-dimensional (2D) OCDMA system based on wavelength-time coding scheme by adding polarization state is investigated at varying data rates from 1 GHz to 6 GHz and for various modulation formats. It is reported that with increase in data rate of system, the performance of the system deteriorates due to polarization mode dispersion. Non-return to-zero (RZ), return to-zero (RZ), carrier suppressed return-to-zero (CSRZ) and differential phase shift keying (DPSK) modulation formats are simulated for a single user system with polarization. Investigations reveal that differential phase shift keying (DPSK) modulation format suits best to the proposed system and exhibit the potential to improve the flexibility of system for more number of users. The investigations are reported in terms of Q-factor, BER, received optical power (ROP) and eye diagrams.

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