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It has been already 12 years since we had the last VTC conference in Tokyo, Japan. In that year 2000, total number of digital mobile subscribers in the world was 663 million with 2nd generation systems, while currently, it has exceeded 5 billion. During the last decade, we have enjoyed tremendous evolution of mobile communications in terms of subscriber numbers and technologies. Diversified services...
For over sixty years this flagship conference of the IEEE Vehicular Technology Society brings together individuals from academia, government, and industry to discuss and exchange ideas in the fields of wireless, mobile, and vehicular technology. Since 1999, VTC has been held twice a year: in North America, and rotating between Europe and the Asia-Pacific region, increasing accessibility to the conference...
The committee has organized an impressive program that advances the current technical and research trends under this year??s conference theme "Shaping the Advanced Wireless Society". This time, we have organized 12 technical tracks covering many exciting aspects of advanced wireless society. Especially, we have newly introduced "GREEN Networks track" because we can no longer talk...
Copyright (c) 2012 by the Institute of Electrical and Electronic Engineers, Inc. All rights reserved. Copyright and Reprint Permissions. Abstracting is permitted with credit to the source. Libraries are permitted to photocopy beyond the limit of U.S. copyright law for private use of patrons those articles in this volume that carry a code at the bottom of the first page, provided the per-copy fee indicated...
In this paper both normal-band and narrow-band PIFA antennas for small terminals are compared through numerical simulations and measurements for different UMTS bandwidths. It is found that using different antennas for the transmitting and receiving regions of the frequency duplex it is possible to achieve a significant improvement in terms of isolation. Measurement results show also that ohmic losses...
Vehicular system designers often use simulation tools in order to prove vehicular systems. The computational complexity of detailed simulations limits the scale of such testings. Therefore, it is often the case that the first full-scale demonstrations of new concepts for vehicular systems are done in proving grounds and testing tracks. We propose Gulliver as a platform for studying vehicular systems...
In unplanned wireless deployments such as femtocells, interference is a major barrier to achieving high data rate. While there exist numerous methods for dealing with planned deployments (macrocells), there are very few effective methods for managing interference in unplanned scenarios. Additionally, most techniques of dealing with interference in unplanned deployments involve exchanging large amounts...
A closed-form precoding scheme using the knowledge of transmit coupling and spatial covariance matrices is proposed, which ensures that the achievable rate increases with the number of transmit antennas when the size of the transmit antenna array is fixed and the radiated power, but not the amplifier output power, is constrained. Eigenvalue-proportional power allocation is employed in this precoding...
The influence of the user's body degrades small antenna performances. This paper investigates the detuning and the losses on high-Q planar antennas for small devices due to user proximity. The results at low frequencies for the Long Term Evolution (LTE) standard are compared to the results for a low- Q antenna. Two hand grips are studied and combined to a SAM(Specific Anthropomorphic Mannequin)phantom...
In a multimode transceiver, the transmitter for one communication standard induces a large interference on the receiver for another one. When this large interference passes through the inherently nonlinear receiver Front-End (FE), it introduces Cross- Modulation (CM) distortion. Increasing the FE linearity to lower the CM distortion leads to unacceptable power consumption for a handheld device. Considering...
Route Optimization (RO) is a function to minimize packet transmission delay through the optimal path between routers communicating with each other. Mobile IPv6 (MIPv6) also supports the RO to solve the triangle routing problem. Basic PMIPv6 does not support the RO. Thus, many schemes have been proposed to support RO in PMIPv6. However, these schemes do not consider the out-of-sequence problem, in...
In this paper, an optimized transmitting power allocation scheme between the source and its cooperator is presented, minimizing the derived closed-form approximated outage probability expressions for the separately adopted maximum ratio combining (MRC) algorithm and selective diversity combining (SDC) algorithm at the satellite. The circumstance considered is the uplink of a dual-hop land mobile satellite...
This paper investigates network-wide spectrum allocation based on the cross-entropy (CE) method in cognitive radio network (CRN). A few spatial spectrum allocation techniques in CRN have been proposed in the literature. However, the optimum spectrum allocation requires an exhaustive search over all combinations of available channels and constraints on secondary users, whose complexity increases exponentially...
A new noise variance based reduced maximum likelihood decision feedback equalization (ML-DFE) algorithm has been developed. This algorithm reduces the calculation complexity by exploring the intrinsic statistical properties layer by layer. Through setting layered thresholds, part of the nodes in the searching process will be cut by comparing with the thresholds. Simulation results show that the complexity...
Recent research shows that user time-varying interference channel is capable of achieving degrees of freedom based on interference alignment (IA). In multiple-input-multiple-output (MIMO) interference channels, appropriate transmit precoder design plays a pivotal role in efficiently suppressing the co-channel interference. In this paper, we propose two heuristic ordered precoder design algorithms...
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