Performance of efficient tactical UHF-satcom waveforms: occupied bandwidth, coding gain, spectral efficiency, bit error rate, and adjacent channel interference

2003 ◽  
Author(s):  
M.K. Nezami ◽  
B. Peterson
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Spectral Efficiency ◽  
Coding Gain ◽  
Adjacent Channel Interference ◽  
Channel Interference ◽  
Adjacent Channel

scholarly journals Spectral Emission Mask Shaping for OFDM in Cognitive Radios

2022 ◽  
pp. 166-171
Author(s):  
Ms. Swarnita Gorakshnath Kale ◽  
Prof. Kale G. B.
Keyword(s):  
Spectral Efficiency ◽  
Orthogonal Frequency Division Multiplexing ◽  
Cognitive Radios ◽  
Frequency Division ◽  
Spectral Emission ◽  
Script Language ◽  
Spectral Leakage ◽  
Adjacent Channel Interference ◽  
Channel Interference ◽  
Adjacent Channel

Orthogonal frequency division multiplexing (OFDM) is characterized by spectral efficiency. It enables flexible and agile spectrum allocation. But still it lags as it suffers from spectral leakage in the form of large side lobes. It leads to inter-channel interference if not handled carefully.in proposed system spectral emission mask system is implemented to combat spectral leakage and ultimately avoiding adjacent channel interference. A spectral mask, also known as a channel mask or transmission mask is a mathematically-defined set of lines applied to the levels of radio (or optical) transmissions. The spectral mask is generally intended to reduce adjacent-channel interference by limiting excessive radiation at frequencies beyond the necessary bandwidth. The proposed system is implemented over MATLAB platform using script language.

scholarly journals Comparative Analysis of Spectral Emission Mask Shaping for OFDM

2021 ◽  
pp. 52-60
Author(s):  
Swarnita Gorakshnath Kale ◽  
Gorakshanth Bhagvatrao Kale
Keyword(s):  
Spectral Efficiency ◽  
Orthogonal Frequency Division Multiplexing ◽  
Additive White Gaussian Noise ◽  
Spectral Emission ◽  
Script Language ◽  
Spectral Leakage ◽  
Adjacent Channel Interference ◽  
Channel Interference ◽  
Adjacent Channel ◽  
Finite Period

In this paper orthogonal frequency division multiplexing (OFDM) is characterized by spectral efficiency. Here we use quadrature Amplitude Modulation (QAM) it is used to improved spectral efficiency. For digital modulations designing new spectrally efficient pulse shapes. When established through an additive white Gaussian noise (AWGN) channel the pulses designed for finite period and give zero inter symbol interference. In proposed system spectral emission mask system is implemented to conflict spectral leakage and ultimately avoiding adjacent channel interference. A spectral mask also known as a transmission mask or channel mask. It is a mathematically-defined set of lines applied to the levels of radio transmissions. The spectral mask is generally proposed to reduce adjacent-channel interference by preventive excessive radiation at frequencies at 20MHz bandwidth. The proposed system is implemented over MATLAB platform using script language.

scholarly journals Performances of BICM-ID system using CRSC code in optical transmissions

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Hocine Fekih ◽  
Boubakar Seddik Bouazza ◽  
Keltoum Nouri
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Iterative Decoding ◽  
Optical Transmission ◽  
Coded Modulation ◽  
Modulation Scheme ◽  
Coding Gain ◽  
Decoding Algorithms ◽  
Qam Modulation ◽  
Short Code

AbstractRecently, using iterative decoding algorithms to achieve an interesting bit error rate for spectrally efficient modulation become a necessity for optical transmission, in this paper, we propose a coded modulation scheme based on bit interleaving circular recursive systematic convolutional (CRSC) code and 16-QAM modulation. The proposal system considered as a serial concatenation of a channel encoder, a bit interleaver and M-ary modulator can be flexible easy to implement using a short code length. For a spectral efficiency $\eta =3\text{bit}/s/Hz$, the coding gain at a bit error rate of 10−6 is about 8 dB.

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