Zhongjiang Yan

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A limited feedback joint precoding for amplify-and forward relaying, " IEEE Trans. MIMO relaying broadcast channels with linear precoding and quantized channel state information feedback , " IEEE Trans. Robust linear beamforming for MIMO relay broadcast channel with limited feedback, " IEEE Signal Process. MMSE relaying design for multi-antenna two-hop(More)
—Wireless sensor networks (WSNs) are widely used for various applications. In some applications, it is very likely that the number of sensors is limited, the initial deployment is random, and deployment " holes " (i.e., subareas where there is no sensor) may exist. Therefore, a major challenge in WSNs is to improve the network coverage. A viable solution is(More)
The physical (PHY) layer peak rate of the wireless local area network (WLAN) has been almost exponentially improved over the past 15 years since 1999. However, it is proved that the throughput is very low comparing to the PHY peak rate, and the media access control (MAC) efficiency is very low in the current WLANs specification, especially in dense(More)
Location estimation is an essential issue for wireless sensor networks (WSN). In this paper a new localization estimation algorithm for WSN is proposed which is based on the Grid-Scan method. In the proposed algorithm, the node collects its 1-hop and 2-hop anchors before the localization algorithm is waked up. Firstly, it obtains the intersection region of(More)
Recently, IEEE drew up a new task group named TGax to draft out the standard IEEE 802.11ax for next generation WLANs. However, the average throughput is very low due to the current medium access control (MAC) protocol. A promising solution for this problem is to draw Orthogonal Frequency Division Multiple Access (OFDMA) into IEEE 802.11ax to enable(More)
In the past few decades, the world has witnessed a rapid growth in mobile communication and reaped great benefits from it. Even though the fourth generation (4G) mobile communication system is just being deployed worldwide , proliferating mobile demands call for newer wireless communication technologies with even better performance. Consequently, the fifth(More)
In ad hoc networks, interference is an important factor limiting the network capacity. Imposing a reservation zone around each receiver has been widely considered to mitigate the interference. A larger reservation zone can decrease the interference, but it also lowers the spatial reuse for reduced simultaneous transmissions. Therefore, there exists an(More)
In this paper, a heuristic clique based spatial time division multiplexing access (STDMA) scheduling algorithm is proposed for concurrent transmission in millimeter wave networks. Firstly, based on the physical interference model an interference level caused by one transmission request to another is defined, which transforms the SINR condition to a(More)