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The optimization of the pilot overhead in wireless fading channels is investigated, and the dependence of this overhead on various system parameters of interest (e.g., fading rate, signal-to-noise ratio) is quantified. The achievable pilot-based spectral efficiency is expanded with respect to the fading rate about the no-fading point, which leads to an accurate order expansion for the pilot overhead...
This paper provides concept of data transmission protocol for millimeter wave (mmWave) wireless systems operating in Non-Line-of-Sight environment. This concept is designed to provide an effective and practical functioning of Multiple-Input Multiple-Output (MIMO) transmission mode that exploits combination of Singular Value Decomposition (SVD) of channel matrix and non-adaptive beamforming. The proposed...
Multiple-input multiple-output (MIMO) wireless communication systems rely upon the knowledge of channel state information (CSI) at the receiver for data detection and decoding. In this paper, a better performance and reduced complexity channel estimation method is proposed for MIMO systems based on matrix factorization. This technique is applied on least squares (LS) channel estimation for performance...
In order to improve the system performance over both frequency- and time-selective fading channels, orthogonal frequency division multiplexing (OFDM) system with transmit diversity technique is an effective and attractive solution. However, the received signal is the superposition of the signals from different transmit antennas. Hence, to obtain accurate channel state information (CSI) is difficult...
We propose a mechanism in which the feedback channel state information (CSI) can be sent to the rate control unit for adapting the encoding rate and doing the selective ARQ at the transmitter periodically. We consider a general framework for the real-time transmission of video data over a channel subjected to random burst packet losses. It is an intuitively appealing result that the rate for the encoded...
In this paper, the soft decision decoding method using CSI (channel state information) for DCM that is used for high data rate (320, 400, 480 Mbps) in MB-OFDM (multi-band orthogonal frequency division multiplexing) system is investigated. OFDM based on UWB system has been proposed by the MBOA to provide very high data rate wireless communication. And CSI can be used in the soft-decision process to...
An array processing based decoder for the quasi-orthogonal space-time block code (QO-STBC) has been analyzed in our former work. It is investigated in terms of complexity and symbol error ratio (SER) under the assumption that perfect channel state information (CSI) is known to the receiver. As in wireless communication scenarios, it is prohibitive to get the perfect knowledge of channel. So it is...
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