Inter-cell interference mitigation using soft frequency reuse with two FOVs in visible light communication

Huynh, Vu Van; Le, Nam-Tuan; Saha, Nirzhar; Chowdhury, Mostafa Zaman; Jang, Yeong Min

doi:10.1109/ictc.2012.6386800

Cited by 8 publications

(23 citation statements)

References 5 publications

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“…In this section, average spectral efficiency, calculated using (10), (16) and (18), is the metric to demonstrate the improvement in the overall system capacity. In addition, average spectral efficiency in the cell edge area, calculated using (11), (15) and (19), is the metric to show the improvement in cell edge user experience.…”

Section: Spectral Efficiency Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Fractional Frequency Reuse in DCO-OFDM-Based Optical Attocell Networks

Chen

Videv

Tsonev

et al. 2015

J. Lightwave Technol.

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In this paper a fractional frequency reuse (FFR) technique is considered in a direct-current optical orthogonal frequency-division multiplexing-based optical attocell network. An optical attocell network is proposed as a special type of visible light communication system that has the complete function of a cellular network. The cellular network is composed of many cells of extremely small size-the optical attocells. Two FFR schemes, strict fractional frequency reuse and soft frequency reuse, are considered. The signal-to-interference-plus-noise ratio (SINR) statistics and the spectral efficiency of the optical cellular system with FFR are analyzed. The performance of the systems with full frequency reuse and FFR is evaluated and compared. The results show that the FFR scheme can effectively achieve interference mitigation in an optical attocell network. The cell edge user SINR and spectral efficiency are significantly improved. Additionally, FFR provides improvements in average spectral efficiency. The effects of important parameters such as cell radius are also studied.

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Section: Spectral Efficiency Resultsmentioning

confidence: 99%

“…In [16], an optical AP using two LED sources with different beam-width is considered. A VLC cellular system using a SFR scheme based on such an AP is proposed.…”

Section: Introductionmentioning

confidence: 99%

Fractional Frequency Reuse in DCO-OFDM-Based Optical Attocell Networks

Chen

Videv

Tsonev

et al. 2015

J. Lightwave Technol.

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“…Sampling the received signal at 2N k R s is equivalent to downsampling the discrete signal by N 2N k when the sampling rate is N R s . Therefore, we can substitute (2) into (13) and obtain…”

Section: Appendixmentioning

confidence: 99%

“…Soft frequency reuse is another method to mitigate inter-cell interference. In [13], a specifically designed LED lamp with two fields-of-view (FOVs) is used to separate a cell into two components, each of which uses a specific frequency so that it can be reused in different cells. The OFDMA research described in [14] and [15] includes power allocation and subcarrier allocation algorithms, respectively, for multiple users in VLC systems.…”

Section: Introductionmentioning

confidence: 99%

Multiuser Visible Light Communication Systems Using OFDMA

Lian

Brandt-Pearce

2020

J. Lightwave Technol.

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Visible light communications (VLC), a short-range optical wireless communication scheme using light-emitting diodes (LEDs) as transmitters, has been proposed to support multiple users, predominantly in indoor environments. This paper explores using orthogonal frequency division multiple access (OFDMA) for VLC due to its high spectrum utilization efficiency and potentially high transmission data rate. The proposed optical OFDMA uses adjacent subcarriers as a set to support each user. Doing so allows some users to sample at a lower sampling rate and employ a smaller fast Fourier transform (FFT) to lower the computational complexity and hardware cost. A multi-cell structure is naturally obtained in VLC since more than one LED lamp is usually installed in an indoor environment. In this paper, users located in different cells can reuse the same subcarrier sets, potentially causing multiple access interference. Analysis and simulation results are used to predict the subcarrier-set reuse probability over the entire indoor space. When the OFDM modulation index is optimized considering the peak-power-limit of the LEDs, the average transmission data rate is twice that of using OFDM that does not reuse the spectral resources, for the scenarios tested.

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“…Notice that this "cognitive" method is different than the related resource allocation study [28], where the authors considered different LED viewing angles 6 Notice that all APs are connected via wires with each other and with the central AP (if exists), and that each of them may have a unique IP address. Therefore, different signaling protocols that are already used in RF wired networks, i.e., in LANs, can be also utilized in our approach.…”

Section: Proposed Resource Allocation Schemementioning

confidence: 99%

Resource allocation and interference management in OFDMA-based VLC networks

Hammouda

Vegni

Haas

et al. 2018

Physical Communication

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Resource allocation and interference management are two main issues that need to be carefully addressed in visible light communication (VLC) systems. In this paper, we propose a resource allocation scheme that can also handle the intercell interference in a multi-user VLC system that employs orthogonal frequency division multiple access (OFDMA). Particularly, we suggest dividing the cell coverage into two non-overlapping zones and performing a two-step resource allocation process, in which each step corresponds to a different level of allocating resources, i.e., zone and user levels. We initially define both zones in terms of the physical area and the amount of allocated resources and we investigate the impact of illumination requirements on defining both zones. Through simulations, we evaluate the performance of the proposed scheme in terms of the area spectral efficiency and the fairness level between the two zones. We show that both performance measures can be potentially enhanced by carefully setting a certain design parameter that reflects the priority level of the users located in the region around the cell center, denoted as Zone 0, in terms of the achievable rate. We further eventuate the system performance in a realistic transmission ✩ scenario using a simulation tool.Recently, the noticeable advances in white light emitting diodes (LEDs) technology motivated utilizing the visible light spectrum for data transmission along with the white LEDs main function of illumination [6,7,8,9,10,11].In addition to providing the required bandwidth, using white LEDs for data transmission has many advantages over the RF technology. For example, they are cheap, energy efficient and no extra infrastructure is needed since white LEDs would be already installed for lighting. Furthermore, using white LEDs for data transmission would inherently ensure data security since light does not propagate through walls.

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Inter-cell interference mitigation using soft frequency reuse with two FOVs in visible light communication

Cited by 8 publications

References 5 publications

Fractional Frequency Reuse in DCO-OFDM-Based Optical Attocell Networks

Fractional Frequency Reuse in DCO-OFDM-Based Optical Attocell Networks

Multiuser Visible Light Communication Systems Using OFDMA

Resource allocation and interference management in OFDMA-based VLC networks

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