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Reducing feedback load for OFDM-based wireless system

The Journal of China Universities of Posts and Telecommunications 2013年第2期20卷 25-31页

作者： LI Ming-ming WANG Xiao-xiang ZHOU Jia Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications

In this paper, the feedback load reduction problem in wireless systems based on orthogonal frequency division multiplexing （OFDM） is investigated and an opportunistic feedback scheme （OFS） is proposed. The key idea behind OFS is that only the key channel gains which can significantly affect the system throughput are fed back to the BS. Firstly, the key channel gains are proved to belong to a channel gain interval. Secondly, a statistical method is proposed to estimate the channel gain interval. Thirdly, the opportunistic feedback scheme is formulated and the feedback load of OFS is analyzed. The advantage of OFS is threefold： the first is OFS can work in both OFDM-based multicast system and OFDM-based unicast system. The second is the channel fading type of the BS-user link is not required, which is more realistic. The third is OFS can get better feedback load performance compared with other schemes, while achieving almost the same throughput performance compared with that of full feedback scheme.

关键词： OFDM wireless system feedback load reduction multicast system unicast system opportunistic feedback scheme

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Interference coordination schemes for cellular network assisted device-to-device multicast

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The Journal of China Universities of Posts and Telecommunications 2013年第5期20卷 63-70页

作者： WANG Dong-yu WANG Xiao-xiang WANG Yu-long Key Laboratory of Universal Wireless Communications Ministry of EducationBeijing University of Posts and Telecommunications

In this paper, a multicast concept for device-to-device （D2D） communication underlaying a cellular infrastruc^tre is investigated. To increase the overall capacity and improve resource utilization, a novel interference coordination scheme is proposed. The proposed scheme includes two steps. First, in order to mitigate the interference from D2D multicast transmission to cellular networks （CNs）, a dynamic power control scheme is proposed that can determine the upper bound of D2D transmitter power based on the location of base station （BS） and areas of adjacent cells from the coverage area of D2D multicast group. Next, an interference limited area control scheme that reduces the interference from CNs to each D2D multicast receiver is proposed. The proposed scheme does not allow the coexistence of cellular user equipments （CUEs） located in the interference limited area to reuse the same resources as the D2D multicast group. From the simulation results, it is confirmed that the proposed schemes improve the performance of the hybrid system compared to the conventional ways.

关键词： OFDM wireless system feedback load reduction multicast system unicast system opportunistic feedback scheme

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