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This paper presents a balanced power control scheme for the uplink of cellular MIMO system. The problem of coordinating power consumption reduce with raise in capacity simultaneously is formulated and an efficient algorithm with good performance is derived. Convex optimization method is used to solve the question. In this paper, an adaptive power allocation scheme is proposed by using interior-point...
Without any doubt the research of VANETs plays an important role in ITS. This paper focuses on reducing the end-to-end delay and the packet loss ratio of the real-time message in VANETs. In this paper, a novel real-time message data packet queue priority algorithm which takes full advantage of the parameters (such as the relative distance, the relative velocity, the relative driving direction between...
Emergency message propagated in vehicular networks is delay intolerance and crucial for safety management. While the non-real-time traffic can highly improves the quality and comfortable of everyday. However, due to the limited transmission coverage and the poor quality of time-varying wireless environment, the two type traffic need relay to assist in the completion of communication. So this paper...
This paper studies a balanced power allocation scheme to approach the capacity limits and power consumption reduce simultaneously of orthogonal-frequency- division-multiplexing multiple-input multiple-output (OFDM-MIMO) channels under the assumption that perfect channel state information (CSI) is available at both the transmitter and the receiver. In this paper, we build a function to describe the...
Without any doubt MIMO techniques count to the few emerging key technologies for wireless communications. It is obviously that MIMO techniques can improve the system capacity and performance. On the other hand, there has been an upsurge of interest in multi-hop infrastructure-based networks in both industry and academia. In this article, multi-hop MIMO relay network is studied and different channel...
It is no doubt that the DSRC technology will play an important role in ITS. It equipped with seven channels that are designated for rich applications to improve the driving safety and support non-safety services. And there is a multi-channel coordination issue for the latter. This paper proposed a novel multi-channel scheduling algorithm for DSRC networks .The target of the multi-channel scheduling...
Some new applications make it possible to improve the comfort and productivity of passengers in car. In vehicular ad hoc networks, however, due to frequent topology change caused by vehicles' high mobility, QoS support of these applications is an essential problem. Significant amount of time is spent in repairing or reconstructing data transmission session for frequent path disruptions. This paper...
This paper proposes an enhanced scheduling solution to support different quality of service (QoS) for IEEE 802.16e broadband wireless access network. Based on the existing scheduling algorithm M-LWDF, we do deeper research into how to integrate it into IEEE 802.16e. The proposed scheduling solution combines the key service flow parameters defined by IEEE 802.16e standard with M-LWDF scheme. Simulation...
Services based on the broadband wireless access (BWA) technology are fast developing, yet the applications are limited by the radio spectrum resource. Due to the high frequency bands allocated, the conventional cellular (single-hop) BWA network can not promise both coverage and throughput achievements in the metropolitan environment This paper proposes a MAC layer simulator architecture introducing...
In this paper, a QoS-oriented cross-layer packet scheduling algorithm is proposed, which takes channel and queue states into account for real-time services in an OFDMA downlink scenario. The algorithm is extended to frequency scheduling in an OFDMA system by performing dynamic channel allocation on a two dimension time-frequency grid including link adaptation by Adaptive Modulation and Coding (AMC)...
Broadband wireless access(BWA) technology based on OFDMA is fast developing, yet the applications are limited by the radio spectrum resource. Due to the high the high-speed mobility, the conventional handover algorithm can not promise both handover successful rate and the delay time in the mobile environment. In this paper, we propose a new adaptive handover algorithm based on the different moving...
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