Optical Wireless MIMO (OMIMO) with Backward Spatial Filter (BSF) in Diffuse Channels

Abstract

In this paper, we propose optical wireless multipleinput multiple-output (OMIMO) with backward spatial filter (BSF) in diffuse channels. In the proposed system BSF is constructed based on the channel state information (CSI) in the transmitter so that the received signal is free from multipath interference, which results in less receiver complexity and good performance. We show that the proposed system can achieve better bit error rate (BER) performance than the conventional single-input single output (SISO) system in diffuse chanels.

Performance Analysis of a MIMO Indoor Infrared Communication System under Ambient Light Noise

“…In this paper the same modulation is used for all the transmit data streams, the total transmit power of the system for PAM can be expressed as [9] ) ( …”

“…We employ an indoor MIMO infrared system used in [9], and assume the channel state information (CSI) is known at the transmitter. The channel, as the form of matrix, can be considered as a block Toeplitz matrix, which is given by where 0 is a zero matrix and ) ( l H represent the lth path channel transfer matrix of the model, which is expressed as (2) where each element of the ) (l H is given in [10].…”

“…Eight ceiling 100(w) tungsten floodlights are assumed following a generalized lambertian pattern of order [12], where q is the electron charge and bg i is the irradiance of the background light on the detector surface [9]. The irradiance bg i is given as…”

“…In this paper, we use the BLAST technique mentioned in [9] in the infrared diffuse channels with considering the room model. Various transmitter and receiver arrangements are considered and the corresponding impulse responses were computed based on the method of [10].…”

“…However, these can not receive signals when there are obstructions on the propagation path. In [9] a BLAST technique was used in diffuse channels for the indoor infrared communication. It assumes the ambient light is isotropic and the total received ambient optical power remains constant without considering the influence of the room model, such as the window and position of the receiver.…”