Yongkai Huo | University of Southampton (original) (raw)

Papers by Yongkai Huo

IEEE Transactions on Vehicular Technology, 2015

IEEE Vehicular Technology Magazine, 2014

ABSTRACT Video clips captured from realworld scenes exhibit intraframe correlation among their pi... more ABSTRACT Video clips captured from realworld scenes exhibit intraframe correlation among their pixels. This correlation can be removed by applying video compression to reduce the required the storage space, transmission bandwidth, bitrate, and power. Layered video coding separates the video sequence into partitions having unequal importance, hence allowing the decoder to progressively refine the reconstructed video quality, when an increased bandwidth is available. On the other hand, compressed video signals are sensitive to channel errors. Therefore, forward error correction (FEC) must be applied when communicating over hostile wireless channels. In addition, based on the fact that the different layers have unequal importance, different-rate FEC codes may be applied to the different layers, leading to unequal error protection (UEP). We propose an interlayer (IL) FEC coding technique combined with UEP, where the lower-importance layers are used for protecting the higher-importance layers in the data-partitioned mode of H.264/advanced video coding (AVC). Explicitly, our simulation results show that the ILcoded system outperforms the traditional UEP system by providing a better video quality for transmission over a wireless eless channel having Eb /N0 of 0 dB, when using our multifunctional multiple-input, multiple-output (MIMO) array.

2014 IEEE Wireless Communications and Networking Conference (WCNC), 2014

ABSTRACT A buffer-aided two hop link is studied, where the RN is capable of temporarily storing t... more ABSTRACT A buffer-aided two hop link is studied, where the RN is capable of temporarily storing the received packets. We commerce by defining the concept of a two-dimensional Channel Probability Space (CPS) based on the source-relay and relay-destination channel. Specifically, a non-linear CPS division method is proposed, which partitions the CPS into several regions representing the quality of the specific channels plus an outage region. Then the best channel is activated for the sake of minimizing the system's energy dissipation. Finally, the proposed buffer-aided transmission scheme relying on our non-linear CPS division regime is investigated and the results show that at given average end-to-end energy dissipation, the outage probability was reduced by 33.533.5\%33.5 compared to the benchmark scheme.

2014 IEEE 80th Vehicular Technology Conference (VTC2014-Fall), 2014

2013 IEEE Wireless Communications and Networking Conference (WCNC), 2013

2013 IEEE 78th Vehicular Technology Conference (VTC Fall), 2013

2012 IEEE Global Communications Conference (GLOBECOM), 2012

2008 11th IEEE International Conference on Communication Technology, 2008

ABSTRACT RF techniques have attracted much attention for the indoor tracking, because of its bett... more ABSTRACT RF techniques have attracted much attention for the indoor tracking, because of its better penetrability than traditional techniques, such as infrared or ultrasound. Generally, existing systems mostly focuses on the localization of the mobile entity. In fact, area information is also an important requirement for some applications, such as intelligent museum explanation, etc. Also, the area information may help to improve the location precision. This paper introduces the Area-Point Indoor Tracking (AIT) system which we have designed and developed on the platform with 22 MicaZ motes. The significant difference from the previous systems is that the proposed tracking procedure is divided into two major steps, i.e., area decision and point localization. And the beacon-correlation algorithm (BCA) and the shadowing-grid localization (SGL) algorithm are designed to solve the above two challenging problems respectively. The evaluation results on the platform show that the BCA algorithm can improve the precision of area decision of MERIT from 71% to 86%, and the SGL algorithm decreases 32% location error compared with Ecolocation algorithm.

2013 IEEE Wireless Communications and Networking Conference (WCNC), 2013

ABSTRACT Iterative source-channel decoding (ISCD) exploits the residual redundancy of the source ... more ABSTRACT Iterative source-channel decoding (ISCD) exploits the residual redundancy of the source by iteratively exchanging extrinsic information with the channel codecs to achieve robust transmission. In this treatise we propose a video codec suitable for lossless video compression and IS CD. At the encoder the spatio-temporal redundancy is partially removed at a low complexity by simply evaluating the frame difference (FD), which is then variable-length encoded (VLC). At the receiver we invoke a three-stage concatenated IS CD scheme for exploiting the residual redundancy of the FD. A Markov Random Field (MRF) model based soft-in-soft-out (SISO) module is proposed for exploiting the spatial correlations amongst the adjacent video pixels, using intra-frame coding. More explicitly, the VLC SISO decoder operates by exchanging soft information with both the MRF module and the soft channel decoder. The convergence of the three-stage iterative decoding process is examined using 3D extrinsic information transfer (EXIT) charts. Finally, we show that our system exhibits a substantial Eb/NO improvement of about 5.2 dB compared to the corresponding benchmarker schemes.

IEEE Transactions on Image Processing, 2000

IEEE Transactions on Vehicular Technology, 2015

IEEE Vehicular Technology Magazine, 2014

ABSTRACT Video clips captured from realworld scenes exhibit intraframe correlation among their pi... more ABSTRACT Video clips captured from realworld scenes exhibit intraframe correlation among their pixels. This correlation can be removed by applying video compression to reduce the required the storage space, transmission bandwidth, bitrate, and power. Layered video coding separates the video sequence into partitions having unequal importance, hence allowing the decoder to progressively refine the reconstructed video quality, when an increased bandwidth is available. On the other hand, compressed video signals are sensitive to channel errors. Therefore, forward error correction (FEC) must be applied when communicating over hostile wireless channels. In addition, based on the fact that the different layers have unequal importance, different-rate FEC codes may be applied to the different layers, leading to unequal error protection (UEP). We propose an interlayer (IL) FEC coding technique combined with UEP, where the lower-importance layers are used for protecting the higher-importance layers in the data-partitioned mode of H.264/advanced video coding (AVC). Explicitly, our simulation results show that the ILcoded system outperforms the traditional UEP system by providing a better video quality for transmission over a wireless eless channel having Eb /N0 of 0 dB, when using our multifunctional multiple-input, multiple-output (MIMO) array.

2014 IEEE Wireless Communications and Networking Conference (WCNC), 2014

ABSTRACT A buffer-aided two hop link is studied, where the RN is capable of temporarily storing t... more ABSTRACT A buffer-aided two hop link is studied, where the RN is capable of temporarily storing the received packets. We commerce by defining the concept of a two-dimensional Channel Probability Space (CPS) based on the source-relay and relay-destination channel. Specifically, a non-linear CPS division method is proposed, which partitions the CPS into several regions representing the quality of the specific channels plus an outage region. Then the best channel is activated for the sake of minimizing the system's energy dissipation. Finally, the proposed buffer-aided transmission scheme relying on our non-linear CPS division regime is investigated and the results show that at given average end-to-end energy dissipation, the outage probability was reduced by 33.533.5\%33.5 compared to the benchmark scheme.

2014 IEEE 80th Vehicular Technology Conference (VTC2014-Fall), 2014

2013 IEEE Wireless Communications and Networking Conference (WCNC), 2013

2013 IEEE 78th Vehicular Technology Conference (VTC Fall), 2013

2012 IEEE Global Communications Conference (GLOBECOM), 2012

2008 11th IEEE International Conference on Communication Technology, 2008

ABSTRACT RF techniques have attracted much attention for the indoor tracking, because of its bett... more ABSTRACT RF techniques have attracted much attention for the indoor tracking, because of its better penetrability than traditional techniques, such as infrared or ultrasound. Generally, existing systems mostly focuses on the localization of the mobile entity. In fact, area information is also an important requirement for some applications, such as intelligent museum explanation, etc. Also, the area information may help to improve the location precision. This paper introduces the Area-Point Indoor Tracking (AIT) system which we have designed and developed on the platform with 22 MicaZ motes. The significant difference from the previous systems is that the proposed tracking procedure is divided into two major steps, i.e., area decision and point localization. And the beacon-correlation algorithm (BCA) and the shadowing-grid localization (SGL) algorithm are designed to solve the above two challenging problems respectively. The evaluation results on the platform show that the BCA algorithm can improve the precision of area decision of MERIT from 71% to 86%, and the SGL algorithm decreases 32% location error compared with Ecolocation algorithm.

2013 IEEE Wireless Communications and Networking Conference (WCNC), 2013

ABSTRACT Iterative source-channel decoding (ISCD) exploits the residual redundancy of the source ... more ABSTRACT Iterative source-channel decoding (ISCD) exploits the residual redundancy of the source by iteratively exchanging extrinsic information with the channel codecs to achieve robust transmission. In this treatise we propose a video codec suitable for lossless video compression and IS CD. At the encoder the spatio-temporal redundancy is partially removed at a low complexity by simply evaluating the frame difference (FD), which is then variable-length encoded (VLC). At the receiver we invoke a three-stage concatenated IS CD scheme for exploiting the residual redundancy of the FD. A Markov Random Field (MRF) model based soft-in-soft-out (SISO) module is proposed for exploiting the spatial correlations amongst the adjacent video pixels, using intra-frame coding. More explicitly, the VLC SISO decoder operates by exchanging soft information with both the MRF module and the soft channel decoder. The convergence of the three-stage iterative decoding process is examined using 3D extrinsic information transfer (EXIT) charts. Finally, we show that our system exhibits a substantial Eb/NO improvement of about 5.2 dB compared to the corresponding benchmarker schemes.

IEEE Transactions on Image Processing, 2000