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A robust beamforming scheme for the processing of wideband signals against direction of arrival (DOA) estimation errors with frequency response invariant property is proposed, where a response variation (RV) element is invoked to control the consistency of the beamformer's response over the frequency range of interest, simultaneously the eigenvector constraints are combined together to overcome the...
Heterogeneous network is supported to improve the link performance in LTE Rel. 10+. The network introduces co-existence of Macro and Pico cell which can alleviate the potential traffic congestion caused by increased user density. Along with the co-existence of difference cells comes the disadvantage of inter-cell interference. Although almost blank subframe (ABS) is proposed to mitigate the interference,...
The radio interferometric positioning system (RIPS) is a novel positioning solution used in wireless sensor networks. This letter explores the ranging accuracy of RIPS in two configurations. In the linear step-frequency configuration, we derive the mean squared error (MSE) of the maximum likelihood (ML) estimator. In the random step-frequency configuration, we introduce average MSE to characterize...
In this letter, a closed-form expression for the exact ergodic capacity of decode-and-forward (DF) systems is derived. Since the closed-form expression includes exponential integral functions and is not mathematically tractable, we simplify the expression by using Taylor series to obtain the lower and upper bounds of the ergodic capacity. However, the bounds may be loose in low signal-to-noise ratio...
To avoid collisions of calling from users of the same dell group, the technique of listen-before-transmit (LBT) is employed in in the Third Generation High Frequency Automatic Link Establishment. In this paper a signal detection method based on the transformed sample auto-correlation matrix is proposed for the LBT. This method makes use of the property that the signal is usually pertinent, while the...
Connectivity is one of the most fundamental properties in wireless ad hoc networks. Due to fading effects, the received power at certain distance becomes a random variable and a mass of unidirectional links emerged which is reflected by the shadowing model. Thus, research for network connectivity based on geometric model is inaccurate. Additionally, interference determines whether a link can be regarded...
In this paper the performance of a pilot aided channel estimator and equalizer for DVB-T2 for the 8 different pilot patterns are explore. In addition to, develop a system that adopts the pilot pattern that provides the best bit error rate(BER) performance for the certain radio environment in which the receiver operates. This scheme will enhance the performance of current DVB-T2 transmission system...
A lossy data compression algorithm based on wavelet transform modulus maxima denoising (WTMM-D) has been proposed. Firstly, analysis for radar raw data is presented to identify data characteristics and correlation. Then, we transform the data format and compare the experimental results using different lossless compression algorithms to compress the transformed raw data. Finally, a method based on...
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