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It has been shown that the performance of multiple-input multiple-output (MIMO) spatial multiplexing systems is significantly degraded when spatial correlation exists between transmit and receive antenna pairs. In this paper, we investigate designs of a new statistical precoder for spatial multiplexing systems with maximum likelihood (ML) receiver which requires only correlation statistics at the...
In this paper fading multiple-antenna (MIMO) wiretap channels are investigated under short term power constraints. The secret diversity-multiplexing tradeoff (DMT) is calculated analytically, when the destination and the eavesdropper have receiver side channel state information (CSI) and the source has transmitter side CSI (CSIT). It is shown that the eavesdropper steals transmitter antennas and the...
This paper studies two-user MIMO interference channel with isotropic fading. We assume that users are equipped with arbitrary number of antennas and the channel state information (CSI) is available at receivers only. An outer bound is obtained for the degree of freedom region, which suggests the loss of degrees of freedom due to the lack of CSI at transmitters under many circumstances.
In this contribution, we provide an exact bit error rate (BER) analysis of orthogonal space-time block codes over arbitrarily distributed (possibly correlated) block fading channels with imperfect channel estimation. The transmitted symbols belong to a PAM or QAM signal constellation. With Nt and Nr denoting the number of transmit and receive antennas, respectively, the resulting average BER can easily...
This paper aims to present the benefit of using a Butler matrix for MIMO systems employing angle domain processing instead of array domain processing. By applying Butler matrix, the concept of angle domain processing can be realized in practice and it still takes a full advantage of multiple antennas. The different scenarios of a fading MIMO environments are examined. The simulation results on channel...
Multiple antennas are widely used in modern high speed wireless data communication systems. Though multiple antennas provide diversity as well as multiplexing gain, there is a fundamental tradeoff between the two under slow fading channel conditions, that any coding scheme can achieve. This is captured in the diversity multiplexing tradeoff (DMT) framework at asymptotically high signal to noise ratios...
In this paper, we study low complexity double space time transmit diversity (D-STTD) and orthogonal frequency division multiplexing (OFDM) system with antenna shuffling. We propose a novel antenna shuffling method based on the criterion of minimizing the condition number of channel correlation matrix. The condition number is an indicator about the quality of the channel. By selecting the minimum of...
In this contribution, we examine the effect of imperfect channel estimation on the bit error rate (BER) performance of square orthogonal space-time block codes (OSTBCs). The propagation channels from the Nt transmit antennas to each of the Nt receive antennas are assumed to be affected by (possibly correlated) flat block fading with an arbitrary distribution. The transmitted symbols belong to a PAM...
Decision feedback detectors for space-time block coding are proposed to combat time-selective fading. Although there are many conventional detectors, better performance is obtained if non-linear techniques are used. If we first detect the most reliable element of the transmitted vector and use it to improve the detection of the other elements of the transmitted vector, better performance can be achieved...
Ultra Wideband technology (UWB) is an emerging technology that has proven to be quite suitable for short range applications. This paper is part of an ongoing research for using UWB technology for positioning team-sport players on a playground, Simulation is conducted for a number of “players” who are carrying RFIDs transmitting signals with biometric information data about each player to a number...
Ultra wideband technology (UWB) is an emerging technology that has proven to be quite suitable for short range applications. This paper is part of an ongoing research for using UWB technology for positioning team-sport players on a playing area. Simulation is conducted for a number of “players” who are carrying RFIDs transmitting signals with biométrie information data about each player to a number...
To achieve high data rate and spectral efficiency requirement, diversity techniques are designed to compensate fading channel impairments. Transmitter diversity scheme are preferred as they effectively increase data rates for all the receivers in their coverage area. Since transmitter diversity techniques such as beamformers at the transmitter require feedback from the receiver, Space-Time Block Coding...
This paper presents a new blind adaptive receiver for the multiple-input multiple-output (MIMO) antennas system, with space-time block code (ST-BC). First, we extend the signal model of the frequency flat channel to the multipath fading channel for the MIMO-CDMA system with ST-BC. The new proposed scheme is based on the linearly constrained constant modulus (LCCM) criterion. To reduce the complexity...
This paper presents a MIMO channel measurement for indoor environment. The results present the comparison of channel capacity by using beamforming technique in MIMO systems. Also, polarization diversities (vertical and horizontal) are introduced to reduce multipath fading issues. The measurements were conducted at 2.4 GHz with Line of Sight (LOS) scenario.
In this paper, a new wideband multiple-input multiple-output (MIMO) fading channel model for vehicle-to-vehicle (V2V) communications is proposed. The MIMO V2V channel model, called for brevity T-model, captures the propagation effects that occur if vehicles move towards a junction with a side road and corner buildings. The starting point for the derivation of the T-model is a new geometric T-junction...
Channel estimation and training sequence design for spatially correlated fading in multiple input multiple output with orthogonal frequency division multiplexing (MIMO-OFDM) systems are still open research topics of great interest. In this paper, we investigate the linear minimum mean square error (LMMSE) channel estimation for MIMO-OFDM systems in spatially correlated fading channels. We find the...
In this paper, an error resilience scheme based on H.264/AVC progressive image transmission over wireless fading channels is proposed. The source coding approach is based on data partitioning (DP) defined in H.264 standard. DP units with unequal important data are applied optimal channel code allocation in terms of their importance, thus yielding a certain degree of error resilience. To overcome frequency...
This paper discusses the performance analysis of multi-antennas systems with receive antenna selection over quasistatic fading channels. In performing the analysis with antenna selection, the selection criterion adopted is based on selecting best Nr antennas out of the available NR receive antennas such that the instantaneous signal-to-noise ratio (SNR) at the receiver is maximized. It is assumed...
This paper proposes an iterative EQ-GM algorithm for SFBC-OFDM systems based on GM channel estimation algorithm and ZF principle. The scheme deduces a frequency domain ZF equalizer for the 2 ?? 2 SFBC-OFDM system to eliminate the channel coefficient differences of the adjacent subcarriers introduced by the frequency selective channel in order to maintain the orthogonality of the SFBC codes at the...
In this paper, a decision-directed multiple-input multiple-output (MIMO) receiver is proposed for a code-division multiple access (CDMA) system using space-time block coding (STBC) over a multipath fading channel. In contract to the conventional MMSE receiver, the proposed blind receiver can provide a reliable performance without requirement of the pilot symbols.
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