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This paper describes a Simulink-based software testbed, which was developed to aid our research on various Multiple-Input Multiple-Output Radar (MIMO radar) technologies designed to operate under different environments. The testbed was used as a platform to test the performance of new generation MIMO radars in detecting slow moving targets on the surface of the ocean. The performance of the developed...
This paper proposes a large-scale cooperative multiple-input multiple-output (CMIMO) beamforming scheme for uplink (UL) access in broadband cognitive radio wireless sensor networks (CR-WSNs) sharing the same spectrum with a primary network and employing orthogonal frequency-division multiplexing. The CR-WSN is divided into clusters each consisting of cooperative nodes that form a virtual antenna array...
This paper proposes an adaptive multi-user Multiple Input Multiple Output (MIMO)-Space Division Multiplexing Access (SDMA) technique for uplink access in broadband wireless cognitive networks with multiple primary users (PUs) and secondary users (SUs) sharing the same spectrum. The proposed algorithm uses gradient search of the channel capacity to seek, iteratively, the optimal transmit weight vectors...
This paper proposes an adaptive multi-user Multiple Input Multiple Output (MIMO)-Space Division Multiplexing Access (SDMA) technique for uplink access in broadband wireless cognitive networks with multiple primary users (PUs) and secondary users (SUs) sharing the same spectrum. The proposed algorithm uses gradient search of the channel capacity to seek, iteratively, the optimal transmit weight vectors...
This paper investigates the performance of spacedivision multiple access (SDMA) schemes in cognitive radio systems (CR) with multiple primary users (PUs) and secondary users (SUs) sharing the same spectrum. By adding more constraints to the conventional SDMA schemes and using the optimization of the Lagrange multipliers we developed an iterative weights calculating method to determine the new cognitive...
In this paper we investigate the impact of mutual coupling (MC) on the performance of a MIMO-beamforming system with closely spaced antenna elements. Simulation results confirm the decrease in system performance when antenna mutual coupling is taken into account.
This paper presents the Simulink implementation of a Multiple Input Multiple Output (MIMO) beamforming system based on the code filtering approach (CFA) and Alamouti's transmit diversity. This model can be used as a platform to test the use of DSPs/FPGs in new generation of MIMO-beamforming systems and will allow evaluating the Bit Error Rate (BER) and the beampattern performances. This goal is achieved...
This paper presents a simplified channel estimation technique for orthogonal frequency division multiplexing (OFDM) systems with multiple input, multiple output (MIMO) antenna structure. The estimation technique is presented both in the frequency and time domains. Quadrature phase shift keying (QPSK) modulation technique is used to modulate the transmitted data. To ensure low computational complexity,...
In this paper we apply differential correlation — Multiple Signal Classification (DC-MUSIC) algorithm with a linear antenna array for delay estimation in an asynchronous CDMA system. Our analysis shows that the differential correlation matrix has a better structure when it is averaged over the different antennas. This results due to the interference and noise suppression capability of the antenna...
This paper proposes a two-stage maximum likelihood estimation (TSMLE) technique suited for multitone code division multiple access (MT-CDMA) system. Here, an analytical framework is presented in the indoor environment for determining the average bit error rate (BER) of the system, over Rayleigh and Ricean fading channels. The analytical model is derived for quadrature phase shift keying (QPSK) modulation...
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