Channel Ranking based Spread Code Optimization for Visible Light Communication OFDM-IDMA Systems

Shimada, Kazushi; Takahashi, Mitsuki; Maruta, Kazuki; Ahn, Chang-Jun

doi:10.1109/apcc47188.2019.9026428

Cited by 1 publication

(3 citation statements)

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“…Conversely, a large one is assigned to them in a weak channel gain. This paper expands the content of the conference paper [13] by examining a wider variety of propagation factors and we find that system throughput and BER performance can be improved. Interference cancellation based CDMA for multiuser detection with OVSF codes and channel ranking concepts were widely investigated in wireless and optical communication fields [14][15] [16].…”

Section: Introductionmentioning

confidence: 68%

“…Here we examined five cases for channel ranking based spreading factor allocation in addition to the following case A [13]; From Fig. 12, the BER performance of the case A has deteriorated by about 1.5 dB at the BER= 10 −4 , compared to the conventional scheme.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…By focusing on this property of OVSF codes, it is possible to improve the throughput of the system by optimizing the spread factor by maintaining the BER features. In order to achieve the above objective, this paper newly proposes a channel ranking based spreading factor optimization for VLC-OFDM-IDMA incorporating PIC [13]. The short spread factor is given to users in a good channel gain.…”

Section: Introductionmentioning

confidence: 99%

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Channel Ranking Based Spreading Factor Optimization for Multiuser Visible Light Communication OFDM-IDMA with Parallel Interference Cancellation

Shimada

Hirano

Takahashi

et al. 2021

Journal of Signal Processing

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This paper proposes a channel ranking based spreading factor optimization for orthogonal frequency division multiple interleave division multiple access (OFDM-IDMA) on visible light communication (VLC) systems. VLC is under the global spotlight, since light emitting diode (LED) has recently become a part of building infrastructure and its functionality is quite easy by implementing communication components to LED lighting. To enhance the VLC capability, OFDM-IDMA was previously proposed as a multiple access method. It also employs a spectrum spreading, in which the symbol is orthogonally spread to a specified number of subcarriers. Here, an interleave pattern specific to the transmission signal of each user can improve the separation capacity of the source signal and therefore multiple access becomes possible in VLC-OFDM-IDMA. However, it requires a lower rate error correction code and a large spread factor to limit the throughput performance. To resolve this problem, we introduce a new channel ranking and allocate an appropriate spreading factor to each user according to their channel state. Overall, BER performance and throughput performance can be enhanced by optimising the spread code.

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Section: Introductionmentioning

confidence: 68%

Section: Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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