Optical MIMO-OFDM With Fully Generalized Index-Spatial LED Modulation

Hussein, Hany S.; Hagag, Mohamed F.

doi:10.1109/lcomm.2019.2926457

Cited by 28 publications

(53 citation statements)

References 8 publications

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“…is the binomial operator. Table 1 shows an example for the ESI-LED transmission functionality, where an extra one and two bits per channel use (bpcu) are gained by the ESI-LED system over the FGIS [33] and the GLIM-OFDM [31], respectively, when n t = 4. Essentially, the proposed ESI-LED scheme achieves SE equal to R ESI = log 2 (M) + 2 bpcu using only four transmit LEDs.…”

Section: The Proposed Esi-led Systemmentioning

confidence: 99%

“…Essentially, the proposed ESI-LED scheme achieves SE equal to R ESI = log 2 (M) + 2 bpcu using only four transmit LEDs. In the example, 16 transmitted LEDs are required with the GLIM-OFDM [31] to achieve the same SE under the assumption that there are two spatial bits provided by the GLIM-OFDM [33], while five transmitted LEDs are needed with the FGIS (…”

Section: The Proposed Esi-led Systemmentioning

confidence: 99%

“…Recently, spatial modulation (SM) [25][26][27][28] techniques were integrated with the optical MIMO-OFDM to improve the VLC system spectral and power efficiency [29][30][31][32][33], where the indices of transmit LEDs (spatial LEDs positions) were exploited to convey additional bits or to handle the complex OFDM time-domain shaping problem. For example, the need for a DC bias was eliminated in [30] by using 2 × 2 MIMO-LED SM.…”

Section: Introductionmentioning

confidence: 99%

“…Even so, there is a strict restriction on the number of LEDs at the GLIM TX. As it was reported in [32,33], the GLIM LED number must be 2 m where m is any integer ≥2. Therefore, in [32], a LED grouping scheme was proposed to handle the GLIM-OFDM aforesaid restriction, where the LED number became any even number ≥ 4.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, both [31,32] still have a constraint on TX LED number (n t ) without giving a clear link between their data rates (R) and n t . As far as we know, there were no systematic studies considering the aforesaid constraints in literature until the authors introduced the fully generalized index-spatial (FGIS) LED modulation in [33]. The FGIS relaxed the aforementioned LEDs number constraint and improved the optical communication system SE by providing an extra spatial domain (SD).…”

Section: Introductionmentioning

confidence: 99%

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Extended Spatial-Index LED Modulation for Optical MIMO-OFDM Wireless Communication

2020

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An efficient optical modulation technique for multi-input multi-output (MIMO) orthogonal frequency division multiplexing (OFDM) visible light communication system is proposed in this paper. The proposed modulation technique is termed as extended spatial-index light-emitting diode (LED) modulation. In the proposed technique, the indices (the spatial domain) of the LEDs are exploited in a dynamic style to not only get rid of the optical OFDM time-domain ( OFDM t d ) shaping problem but also to expand the LED indices spatial modulation domain. The indices of the active LEDs in the proposed technique are changed from the two LEDs active situation to the situation where all or several LEDs are active. Moreover, within the selected active LED indices, the power weight distribution and the positions of the OFDM components are varied to expand the resultant spatial domain. Therefore, the proposed technique offers a considerable spectral efficiency improvement over the up-to-date LED index OFDM modulation schemes even with a lower number of LEDs. The key idea of the proposed technique is to maximize the LEDs’ indices spatial position (spatial domain) utilization, where both the power weight allocation and the positions of the complex OFDM time domain components are varying several times over the same active LED indices combination, which improve the optical system spectral efficiency. The simulation results asserted the superiority of the proposed technique, as it improves both the average bit error rate (ABER) and the achievable data rate (R) compared with existing up-to-date OFDM-LED index modulations with even lower computational complexity.

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Section: The Proposed Esi-led Systemmentioning

confidence: 99%

Section: The Proposed Esi-led Systemmentioning

confidence: 99%