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This paper proposes a new approach to block spread OFDM called parallel concatenated spreading matrices OFDM (PCSM-OFDM). While BSOFDM improved the overall BER performance on OFDM in frequency selective channels, this new approach further improves the BER of BSOFDM by a 3 dB gain. This is achieved through increasing the diversity of the transmitted samples by concatenating two spreading matrices in...
Identification of performance indicators of the communication solutions applied in the Intelligent Transport system (ITS) was studied within projects CaMNA and SRATVU . Prime goal of the CaMNA project is to improve efficiency and security of the airport over-ground traffic operated in the specific airport area conditions. ITS requirements on the communications environment are usually quantified indirectly...
In this paper, we analyze statistical properties of the largest eigenvalue of correlated complex Wishart matrices. The results provide an analytical tool for the study of multiple-input multiple-output (MIMO) maximal ratio combining (MRC) systems in the presence of spatial fading correlation at the transmitter or receiver. Based on them, the exact closed-form expressions for the cumulative distribution...
We consider optimum Transform coding. The objective is to minimize the distortion variance by selecting an optimum transform matrix and bit allocation among the sub-band signals. Under an asymptotic expression for the quantizer distortion function it is known that the optimum transform can be chosen to be orthonormal and regardless of the precise allocated bit values. In this paper we have given sufficient...
Localization of ad-hoc wireless networks is useful for services, management and routing. Localization is frequently based on station-to-station range measurements and a few reference sensors. We address the localization problem in the case of incomplete set of noisy range measurements with unknown bias. A statistically efficient, maximum likelihood algorithm, inspired by the Gerchberg-Saxton procedure...
We address pilot-aided channel estimation for a flat-fading spatially-correlated MIMO system, which employing Uniform Linear Arrays(ULA) on dual side and working in sparse scattering (multipath) environment. In case of sparse scattering, channel matrix and spatial correlation of flat-fading MIMO systems are parameterized by structure of multipaths, which is represented as Direction of Arrivals(DOAs),...
In a recent study on blind multichannel identification, we presented a fast Fourier transform based algorithm, called the BI-FFT algorithm. The BI-FFT algorithm is capable of dealing with channel outputs of a very short length, which is of practical importance in communication applications where wireless channels involve high mobility. However, when the output sample size is relatively large, the...
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