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In irregular low density signature-orthogonal frequency division multiplexing (IrLDS-OFDM) random access system, since no uplink scheduling is performed, each user randomly picks one low density signature (LDS) with different density factor, and spreads the symbols with LDS in the time-frequency domain. In this paper, we propose a game theoretical model to describe this non-cooperative uplink multiple...
Interference mitigation scheme is studied for Device-to-Device (D2D) communication in cellular networks to improve the overall system capacity and spectrum efficiency. Firstly a lower bound of the neighbor distance is derived for a D2D UE according to the transmitter density and the QoS requirement of a D2D pair. By using this distance, a neighbor set can be chosen adaptively based on the interference...
Adaptive beamformers will degrade severely when the array weights cannot adapt as fast as the environmental changes, especially when unexpected interferences exist. Low sidelobe levels can increase the ability to suppress the white noise and unexpected interferences. The adaptive beamforming with low sidelobe levels is transformed into a weighted pattern synthesis problem. This weighting function...
In this paper, we investigate the performance of cooperative decode-and-forward (DF) multiple-input multiple-output (MIMO) relaying system with orthogonal space-time block code (OSTBC) transmissions over correlated Nakagami-m fading channels. For maximal ratio combining (MRC) receiver at the destination, we provide the compact closed-form expressions for cumulative distribution function (CDF) and...
Cognitive radio draws lots of research attentions in recent years for its efficient spectrum utilization. This research proposes a discrete wavelet packet transform (DWPT)-based spectrum sensing processor for cognitive radio systems. In this processor, this study proposes a partial DWPT spectrum analyzer and a double-threshold energy detection and decision result prediction technique to reduce the...
To increase the capacity of mobile communications, it is important to accurately estimate the power and the direction of arrival (DOA) of source. An efficient algorithm is proposed for this purpose. A cost function is optimized by using the particle swarm optimization (PSO). To accelerate the convergence of the fitness function of PSO, the inertia weights of particles are different from each other...
Interest exists in developing tomosynthesis machines and dedicated CT scanners for providing 3D images of breasts. Prototypes of dedicated breast CT scanners have been built and are under evaluation. In these scanners, analytic algorithms such as FDK are currently used for image reconstruction, which generally require data collected at a large number of views over a circular-scanning configuration...
In this paper, we propose jointly-optimized beam-forming algorithms for cognitive networks to maximize the achievable rates assuming single information stream in both primary and secondary links. The primary and cognitive users share the same spectrum and are equipped with multiple antennas. No coordination is required between the primary and cognitive users and the interference cancellation is done...
In this paper, we first introduce a simple two-cell multiple-input multiple-output (MIMO) solution where each base station has only its own data message. The algorithm is based on limited feedback from the mobile station (MS). We assume there is no base station (BS) cooperation through backbone; therefore cooperation among BSs is not a requirement. This renders the concept of the proposed solution...
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