We present a network-level signaling mechanism for user access and service setup in light emitting diode （LED）-based visible light communication （VLC） networks and define the corresponding signaling messages. In t...We present a network-level signaling mechanism for user access and service setup in light emitting diode （LED）-based visible light communication （VLC） networks and define the corresponding signaling messages. In this mechanism, lamp selection is an important step for realizing flexible user access and efficient resource allocation. Two basic selection schemes are proposed, and an enhanced bandwidth-based scheme is presented. Simulation results show the different advantages among these schemes.展开更多
A room division multiplexing （RDM）-based hybrid visible light communication （VLC） network for realiz- ing indoor broadband communication within a multi-room house is presented. The downlink information is transmit...A room division multiplexing （RDM）-based hybrid visible light communication （VLC） network for realiz- ing indoor broadband communication within a multi-room house is presented. The downlink information is transmitted by light-emitting diode lamps, whereas the uplink information is transmitted through WiFi. RDM is introduced to improve the VLC network throughput; in addition, the associated signaling lo- calization and active handoff mechanisms are designed for implementation. The experimental platform demonstrates the effectiveness of the proposed hybrid architecture, along with the RDM and active handoff mechanisms.展开更多
Multi-robot coordination （MRC） is a key challenge for complex artificial intelligence systems, and conventional wireless-communication-based MRC mechanisms that cannot be deployed in radio-frequency-limited environ-...Multi-robot coordination （MRC） is a key challenge for complex artificial intelligence systems, and conventional wireless-communication-based MRC mechanisms that cannot be deployed in radio-frequency-limited environ- ments. In this Letter, we present a promising solution that utilizes indoor omni-directional visible light communication （VLC） technology to realize efficient multi-robot intelligent coordination （MRIC）. The specific design is presented along with the implemental details of a practical MRIC experimental platform. The exper- imental results show that a 50 Mb/s on-off-keying-based omni-directional VLC can be realized with an effective distance of 2.3 m and a bit error rate of 〈10^-6 in the proposed MRIC platform.展开更多
Indoor visible light communication （VLC） based on next generation environmentally friendly lighting is important in energy conservation. However, at present, the efficient characterization of VLC channels, including...Indoor visible light communication （VLC） based on next generation environmentally friendly lighting is important in energy conservation. However, at present, the efficient characterization of VLC channels, including sophisticated reflection, has not yet been proposed. In this letter, we present a fast and comparably accurate channel characterization algorithm called independent reflecting element interaction characterization （IREIC）, which can be used to describe optical power, illuminance, and impulse response.展开更多
In visible light communication, orthogonal frequency division multiplexing （OFDM） is an effective approach to improve the system speed. However, the nonlinearity of the light-emitting diode （LED） suppresses the tr...In visible light communication, orthogonal frequency division multiplexing （OFDM） is an effective approach to improve the system speed. However, the nonlinearity of the light-emitting diode （LED） suppresses the trans- mission performance. The low-frequency part of the transmitted signal from LED suffers more from nonlinearity. Therefore, a pre-equalization scheme which suppresses the low frequency part of the OFDM signal and enhances the high frequency part can decrease the impact of LED nonlinearity. The experimental results show that the bit-error rate performance is largely enhanced by the pre-compensation.展开更多
This Letter proposes a model of indoor visible light communication(VLC)heterogeneous networks entirely based on LEDs with different specifications and applies non-orthogonal multiple access(NOMA)to it because of the n...This Letter proposes a model of indoor visible light communication(VLC)heterogeneous networks entirely based on LEDs with different specifications and applies non-orthogonal multiple access(NOMA)to it because of the narrow modulation bandwidth of LEDs.Moreover,a user-grouping scheme that is based on matching theory is proposed to improve the network achievable sum rate.Simulation results indicate that when each NOMA cluster contains 6 users,the proposed scheme has a 49.54%sum-rate enhancement compared with the traditional user-grouping scheme.As the number of users in each NOMA cluster increases,the proposed scheme performs better at the cost of computational complexity.展开更多
Visible light positioning （VLP） is an emerging candidate for indoor positioning, which carl simultaneously meet the requirements for accuracy, cost, coverage area, and security. However, intercell interference causc...Visible light positioning （VLP） is an emerging candidate for indoor positioning, which carl simultaneously meet the requirements for accuracy, cost, coverage area, and security. However, intercell interference causcd by light intensity superposition linfits the application of VLP. In this Letter, we propose a united block sequence mapping （UBSM）-based VLP that utilizes superposition to integrate the multidimensional information from dense small cells into 2D information. The experimental result shows that UBSM-based VLP can achieve an accuracy of 1.5 cm with a 0.4 m row spacing and 0.35 m column spacing of LED lights.展开更多
基金supported in part by the National Natural Science Foundation of China (No. 61171103)the National "973" Program of China (No. 2012CB315705)+1 种基金the National "863" Program of China (No. 2011AA010306)the Fundamental Research Funds for Central Universities,China (No. BUPT2009RC0126)
文摘We present a network-level signaling mechanism for user access and service setup in light emitting diode （LED）-based visible light communication （VLC） networks and define the corresponding signaling messages. In this mechanism, lamp selection is an important step for realizing flexible user access and efficient resource allocation. Two basic selection schemes are proposed, and an enhanced bandwidth-based scheme is presented. Simulation results show the different advantages among these schemes.
基金supported by the National "973" Program of China (No. 2013CB329204)the National "863"Program of China (No. 2013AA013601)the Fundamental Research Funds for the Central Universities (No.BUPT2012RC0117)
文摘A room division multiplexing （RDM）-based hybrid visible light communication （VLC） network for realiz- ing indoor broadband communication within a multi-room house is presented. The downlink information is transmitted by light-emitting diode lamps, whereas the uplink information is transmitted through WiFi. RDM is introduced to improve the VLC network throughput; in addition, the associated signaling lo- calization and active handoff mechanisms are designed for implementation. The experimental platform demonstrates the effectiveness of the proposed hybrid architecture, along with the RDM and active handoff mechanisms.
基金supported in part by the National 973Program of China(No.2013CB329205)the National Natural Science Foundation of China(No.61401032)the Funds of Beijing Advanced Innovation Center for Future Internet Technology of Beijing University of Technology(BJUT),P.R.China
文摘Multi-robot coordination （MRC） is a key challenge for complex artificial intelligence systems, and conventional wireless-communication-based MRC mechanisms that cannot be deployed in radio-frequency-limited environ- ments. In this Letter, we present a promising solution that utilizes indoor omni-directional visible light communication （VLC） technology to realize efficient multi-robot intelligent coordination （MRIC）. The specific design is presented along with the implemental details of a practical MRIC experimental platform. The exper- imental results show that a 50 Mb/s on-off-keying-based omni-directional VLC can be realized with an effective distance of 2.3 m and a bit error rate of 〈10^-6 in the proposed MRIC platform.
基金supported in part by the National"863" Program of China (No.2009AA01A345)the National Natural Science Foundation of China (No.60932004)+1 种基金the National "973" Program of China (No.2007CB310705)the Chinese Universities Scientific Fund (No.BUPT2009RC0126)
文摘Indoor visible light communication （VLC） based on next generation environmentally friendly lighting is important in energy conservation. However, at present, the efficient characterization of VLC channels, including sophisticated reflection, has not yet been proposed. In this letter, we present a fast and comparably accurate channel characterization algorithm called independent reflecting element interaction characterization （IREIC）, which can be used to describe optical power, illuminance, and impulse response.
基金supported in part by the National 973 Program of China(No.2013CB329205)the National Natural Science Foundation of China(No.61401032)the National 863 Program of China(No.2013AA013601)
文摘In visible light communication, orthogonal frequency division multiplexing （OFDM） is an effective approach to improve the system speed. However, the nonlinearity of the light-emitting diode （LED） suppresses the trans- mission performance. The low-frequency part of the transmitted signal from LED suffers more from nonlinearity. Therefore, a pre-equalization scheme which suppresses the low frequency part of the OFDM signal and enhances the high frequency part can decrease the impact of LED nonlinearity. The experimental results show that the bit-error rate performance is largely enhanced by the pre-compensation.
基金This work was supported in part by the National Key R&D Program of China(No.2017YFB0403605)the National Natural Science Foundation of China(No.61801165)the National 973 Program of China(No.2013CB329205).
文摘This Letter proposes a model of indoor visible light communication(VLC)heterogeneous networks entirely based on LEDs with different specifications and applies non-orthogonal multiple access(NOMA)to it because of the narrow modulation bandwidth of LEDs.Moreover,a user-grouping scheme that is based on matching theory is proposed to improve the network achievable sum rate.Simulation results indicate that when each NOMA cluster contains 6 users,the proposed scheme has a 49.54%sum-rate enhancement compared with the traditional user-grouping scheme.As the number of users in each NOMA cluster increases,the proposed scheme performs better at the cost of computational complexity.
基金supported in part by the National 973Program of China(No.2013CB329205)the National Science Foundation of China(No.61401032)
文摘Visible light positioning （VLP） is an emerging candidate for indoor positioning, which carl simultaneously meet the requirements for accuracy, cost, coverage area, and security. However, intercell interference causcd by light intensity superposition linfits the application of VLP. In this Letter, we propose a united block sequence mapping （UBSM）-based VLP that utilizes superposition to integrate the multidimensional information from dense small cells into 2D information. The experimental result shows that UBSM-based VLP can achieve an accuracy of 1.5 cm with a 0.4 m row spacing and 0.35 m column spacing of LED lights.
