This paper presents the systematic evaluation of performance of indoor optical wireless communication using different modulation schemes and micro electro mechanical systems - single channel imaging receiver (MEMS-SCIR). For the future modern world, indoor optical wireless communications (OWC) play a vital role. The main objective is to compare the performance of various modulation schemes in terms of their bit error probability. On -off keying (OOK) and pulse position modulation (PPM) are widely used in optical wireless communication for its simplicity. Here different digital modulation schemes are approached; bit error rate (BER) is calculated over additive white Gaussian noise channel (AWGN). M-quadrature amplitude modulation (MQAM) gives a better BER performance compared to the M- phase shift keying (MPSK). Thus, MQAM based MEMS-SCIR provides better performance in indoor optical wireless communications.
This paper reports systematic appraisal of wavelet transform based de-noising receiver, for high speed indoor optical wireless communication. For upcoming high speed indoor optical wireless communication systems, wavelet transform based de-noising receiver in indoor environment represent grand consideration. Performance evaluation is carried out in the presence of natural (sunlight) and artificial light sources (incandescent light) in typical room environment. The performance of receiver is considered in two arrangements: They are single channel imaging receiver (SCIR) and wavelet transform based denoising receiver. The second scheme provides better results than first scheme (SCIR). The simulation results for both SCIR and wavelet transform based de-noising receiver are shown. The simulation results indicate that the wavelet packet transform (WPT) based de-noising receiver offers increased received optical power, signal to noise ratio (SNR), and reduced bit error rate (BER), path loss compared to the SCIR and discrete wavelet transform based de-noising receiver.
In this paper, wavelet packet transform (WPT) based de-noising receiver for visible-light communication (VLC) using a white light-emitting diode (LED) is studied for indoor applications such as short distance wireless connectivity, optical wireless local area network, and optical wireless input / output control devise (remote control). Previously, reported discrete wavelet transform based de-noising for indoor optical wireless communication; here we considered wavelet packet transform based de-noising technique. The process starts with the evaluation of the performance of de-noising receiver by calculating the received optical power, signal noise ratio (SNR), path loss and bit error rate (BER). Throughout the simulation results, the SNR performance is inversely proportional to the distance. Analytical study of SNR for VLC system without de-noising for indoor applications has been studied. In this paper de-noising technique is considered for reduction of noise. The DWPT based de-noising receiver, with a single source improves the SNR performance approximately by 2% compared to the one without de-noising receiver.
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