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A micro-strip quasi-Yagi antenna is improved in this paper. The antenna unit for X band is designed. The number of the directors is increased in order to improve the gain of the antenna. The length of the directors, the width of the directors and the space of each directors are simulated and analyzed by the simulation software HFSS. The results show that: the bandwidth of the antenna is greater than...
In this paper, design of a shaped beam linear antenna array for RFID reader application in UHF frequency band of 902–928MHz was presented. Aperture-coupled patch configuration was adopted as array element. Fourier Series Method for antenna synthesis was used to calculate amplitude and phase of each corresponding antenna element, thus realizing the predefined pattern by feeding network of power divider...
Cooperative Communication enables wireless devices with relatively less antennas to share their antennas and create virtual multiple-antenna transmitter, thereby achieving transmit diversity to combat fading caused by multi-path propagation in wireless environment. At the receiver in a multi- input multi-output (MIMO) relay system, we can still utilize the traditional detection algorithm, such as...
This paper proposes a novel sub-optimal transmit antenna selection (TAS) strategy for non-regenerative half-duplex MIMO relay channel. While antenna selection is a sub-optimal form of beamforming, it still enjoys the advantage of tractable optimization and low feedback overhead. The diversity order of this proposed strategy is derived to prove that it can achieve the full diversity order as the optimal...
We compare the outage performance by applying transmit antenna selection strategies to amplify-and-forward protocol in the MIMO relaying scenario. Although antenna selection is a suboptimal form of beamforming, it enjoys the advantages of tractable optimization and low feedback overhead. Specifically, by combining transmit antenna selection strategies with amplify-and-forward protocol, we propose...
Wishart matrix and its eigenvalues are very important to the analysis of multiple-antenna systems. In this paper, we derive a polynomial expression for the distribution of the smallest eigenvalue of Wishart matrices. Compared with earlier results in matrix determinant forms, our expression is much easier to handle. The expression obtained applies for Wishart matrices of arbitrary orders and is an...
A real-time traffic scheduling algorithm is proposed for the downlink of multi-cell and multi-user MIMO-OFDMA systems. This proposed scheduling algorithm takes the spatial and frequency characters of users into account, and transmission antenna selection and modified water-filling power allocation algorithms are adopted in the allocation of space-frequency subchannels. Simulation results show that...
A new adaptive irregular modulation technique is proposed for Turbo iterative detected multi-antenna system with different bit mapping schemes or (and) modulation schemes used in different transmit antennas. The modulation scheme and the bit mapping scheme can be adaptively chosen according to the time varying channel quality to improve the channel throughput. When combining the proposed approach...
In this paper, list detection based on lattice reduction (LDLR) in MIMO systems is proposed. By generating a list of candidate transmit symbol vectors we can improve the performance of linear detection based on lattice reduction and successive interference cancellation based on lattice reduction significantly. The performance improvement is demonstrated by computer simulations, which also show that...
Iterative list sphere decoding (LSD) can achieve near capacity on a multiple-antenna channel, however, with a rather high complexity. In order to reduce the complexity, in this paper, linear detection-based iterative soft interference cancellation (ISIC) instead of LSD is applied at the second and later iterations. We propose to exploit extrinsic information transfer (EXIT) chart analysis to select...
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