TY  - JOUR
TI  - Performance Analysis of MIMO Techniques for a Pyramid Receiver in an Indoor MIMO-VLC System
AB  - In an indoor multiple-input multiple-output (MIMO) visible light communication (VLC) system, line of sight (LoS) channel links are present between a light-emitting diode (LED) based transmitter and a photodetector (PD) based receiver. The PDs in the receiver are closely packed resulting in a high channel correlation. To overcome channel correlation and improve the performance of the MIMO-VLC system, angle diversity receivers (ADRs) are commonly employed. The channel matrix entries depend on the normal vectors of the PDs, which in turn depend on the elevation angle (EA) of the PDs. Thus, by having normal vectors pointing in different directions, the channel correlation can be considerably reduced. This paper considers a special type of ADR called pyramid receiver (PR) and employs a 4x4 MIMO-VLC system. In this paper, different MIMO algorithms such as repetition coding (RC) and spatial multiplexing (SMP) are considered to exhibit and compare the bit-error-rate (BER) performance of the fixed and variable EA MIMO-VLC systems. The results show that an SMP-employed MIMO-VLC system outperforms the RC-employed MIMO-VLC system. SMP results in an spatial multiplexing gain that varies linearly with the number of LEDs whereas RC does not yield any spatial multiplexing gain. To attain the same spectral efficiency i.e. 4 bit/s/Hz, a larger signal constellation size is required for RC employed MIMO-VLC system to achieve the same BER as of an SMP employed MIMO-VLC system. Similarly, the BER performance of variable EA MIMO-VLC systems is better as compared to fixed EA MIMO-VLC systems.
AU  - KHAN, AAMIR ULLAH
AU  - Aldırmaz Çolak, sultan
AU  - Celik, Yasin
DO  - 10.16984/saufenbilder.849408
PY  - 2022
JO  - Sakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi
VL  - 26
IS  - 5
SN  - 1301-4048
SP  - 1942
EP  - 1955
DB  - TRDizin
UR  - http://search/yayin/detay/1136840
ER  -