Deep Analytical Study of Optical Wireless Communication Systems Performance Efficiency Using Different Modulation Techniques in Turbulence Communication Channels
نویسندگان
چکیده
This paper has presented the different advanced modulation techniques for free space optical (FSO) communication systems transmission efficiency enhancement and signal quality estimation in weak, medium and strong turbulence communication channels. The bandwidth and power efficiency issues in free space optics (FSO) transmissions are addressed under non return to zero on-off keying (NRZ-OOK), return to zero on-off keying (RZ-OOK), pulse position modulation (N-PPM), pulse amplitude modulation (M-PAM), quadrature amplitude modulation (H-QAM) schemes, and their performance in terms of power and bandwidth efficiencies and the bit error rate (BER) against signal to noise ratio (SNR) are compared analytically. The comparative study of the NRZ-OOK, RZ-OOK, N-PPM, M-PAM, and H-QAM schemes are deeply discussed. As well as the minimum detectable received power is also investigated for different Avalanche photodiode (APD) detector receivers types in different turbulence communication channels.
منابع مشابه
Quadrature Amplitude Modulation All Optical Orthogonal Frequency Division Multiplexing-dense Wavelength Division Multiplexing-optical Wireless Communication System under Different Weather Conditions
This paper proposes an analytical model for evaluating the performance of dense wavelength division multiplexing (DWDM) for all optical orthogonal frequency division multiplexing (AO-OFDM) optical wireless channel. The investigated performance for proposed system is evaluated for the parameters bit error rate (BER) and Q factor .The constellation diagrams, and bit error rate (BER) of the recei...
متن کاملEvaluation Performance of OFDM Mutlicarrier Modulation over Rayleigh and RicianStandard Channels Using WPT-OFDM Modulations
Last years, Wavelet Packet Modulation (WPM) or Wavelet Packet Transform based Orthogonal Frequency Division Multiplexing (WPT-OFDM) have been introduced to wired and wireless communication fields as efficient Multicarrier Modulation (MCM) techniques. The wavelets have interesting features such as flexibility, compatibility and localization in both time and frequency domains with no need to use ...
متن کاملBlock error rate of optical wireless communication systems over atmospheric turbulence channels
Block error rate performance of subcarrier intensity modulation based optical wireless communication systems is analysed over Gamma–Gamma and lognormal atmospheric turbulence channels. The analysis is applicable to non-coherent binary modulations and coherent binary phase shift keying. The special cases of K-distributed strong turbulence channel and negative exponential turbulence channel are a...
متن کاملOn the communication over strong atmospheric turbulence channels by adaptive modulation and coding.
The free-space optical (FSO) communications can provide any connectivity need at high-speed. However, an optical wave propagating through the atmosphere experiences the variation in amplitude and phase due to scintillation. To enable high-speed communication over strong atmospheric turbulence channels, we propose to transmit the encoded sequence over both FSO and wireless channels, feedback cha...
متن کاملUsing WPT as a New Method Instead of FFT for Improving the Performance of OFDM Modulation
Orthogonal frequency division multiplexing (OFDM) is used in order to provide immunity against very hostile multipath channels in many modern communication systems.. The OFDM technique divides the total available frequency bandwidth into several narrow bands. In conventional OFDM, FFT algorithm is used to provide orthogonal subcarriers. Intersymbol interference (ISI) and intercarrier interferen...
متن کامل