The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Distributed multiple-input multiple-output (DMIMO) system is a combination of distributed antenna systems (DAS) and co-located antenna systems (CAS). Power allocation between different antennas is a very important aspect in both DAS and CAS. In this paper, we investigate the downlink power allocation scheme in D-MIMO systems based on minimum symbol error rate (SER) criteria. We propose a power allocation...
In this paper, we derive an expression of the instantaneous signal-to noise ratio (SNR) for 4 transmit antennas and 2 receive antennas quasi-orthogonal space-time block codes (QSTBC) system with Jafarkhani code, which as a criteria of antenna selection in spatial correlated Rayleigh fading channels. Under the condition of the correlation matrix is known, both capacity performance and bit error performance...
The performance of ground to satellite Free Space Optical (FSO) communication link is degraded due to the presence of atmospheric turbulence that causes fluctuations in both intensity and phase of the received optical signal. In this paper, bit error rate (BER) performance of FSO link using transmit diversity is investigated for coherent (sub-carrier BPSK and sub-carrier QPSK) and non-coherent (OOK...
Transmission environment of mine laneway is non-free, wireless communication reliability is reduced by multi-path fading. MIMO can efficiently overcome multi-path fading, but MIMO channels in mine laneways have strong correlation. In this paper, the performances of space-time code in mine laneway are investigated, and the pair wise error probability (PEP) about mine laneway is analyzed. Following...
Wireless Body Area Networks (WBANs) have been recently proposed due to increasing technical demands on wearable computing and healthcare systems. Advanced studies for any communication system begin with a channel model. This paper examines channel models for signal propagation around the surface of the body at 915 MHz and 2.45 GHz (ISM bands). The applications of multiple-input-multiple-output (MIMO)...
The paper investigates the average pair-wise error probability (PWEP) performance of orthogonal space-time coded MCPM (OST-MCPM) systems for two transmit antennas over independent and correlated channels. Simple upper boundary expression at high SNR is derived to evaluate the PWEP in correlated channel. The achievable diversity gain of this system decreases due to the signal correlation between the...
Recently, it is shown in that by interference cancellation through zero-forcing a diversity order of 2(M -1) can be achieved in a multiple access channels (MAC) based uplink two-user MIMO system with two transmit antennas at each user and M >2 receive antennas at the base-station. In this paper, we show that by using improved array processing technique a diversity order of 2M can be achieved in...
This paper investigates the performance of multiple input multiple output orthogonal frequency and code division multiplexing (MIMO-OFCDM), where practical channel estimation is carried out with time-multiplexed pilot signals. Conditioned on each channel realization and estimation, the BER of MIMO-OFCDM is analytically evaluated, assuming zero-forcing successive interference cancellation (ZF-SIC)...
A 64-state 16-QAM space-time trellis code (STTC), which uses two transmitting antennas, is proposed and applied to a 2??2 MIMO-OFDM system for outdoor mobile transmission in the 800-MHz band. Although STTCs have been analyzed theoretically and the error performances have been simulated by many researchers, experimental results have rarely been reported. Therefore, we evaluated the performance of our...
In this paper, the performance of vertical Bell labs space-time (V-BLAST) algorithms for the MIMO systems with two transmit antennas is analyzed over correlated-Rayleigh channel. We derive the analytical bit error rates (BERs) of the first and second detection steps for both optimal and fixed detection ordering schemes. We also investigate the signal-to-noise ratio (SNR) degradation of the detection...
This paper presents the performance of a Fractional Sampling OFDM receiver with delay diversity. Delay diversity achieves transmit diversity by intentionally ingenerating paths which have different delays at a transmitter side. However, the correlations between subcarriers are not always low. The proposed scheme which combines the delay diversity and the FS offers diversity gain by reducing the correlation...
We propose and analyze a generalized spatial modulation scheme, where depending on the bits to be transmitted a certain data symbol as well as a certain beamforming vector is chosen. The receiver then has to estimate both the used beamforming vector and the transmitted data symbol for being able to reconstruct the originally transmitted bit sequence. We analyze our scheme theoretically by deriving...
In this paper, using the equivalent single-input single-out (SISO) model, we derive the exact symbol error rate (SER) and bit error rate (BER) of orthogonal space-time block codes (OSTBCs) with multiple modulations over flat uncorrelated and correlated Rayleigh fading channels. We provide the impact of antenna correlation on the performance of OSTBCs. The results showed that the symbol error rate...
In this paper, we present a belief propagation (BP) based algorithm for decoding non-orthogonal space-time block codes (STBC) from cyclic division algebras (CDA) having large dimensions. The proposed approach involves message passing on Markov random field (MRF) representation of the STBC MIMO system. Adoption of BP approach to decode non-orthogonal STBCs of large dimensions has not been reported...
In this paper, we investigate MIMO systems with transmit antenna selection over an intra-class correlated Rayleigh fading channel. In our study, one single transmit antenna with an aim to maximizing the total received signal-to-noise ratio (SNR) is selected for transmission, while it is assumed that the receive side use all the available antennas. Using binary-phase-shift-keying (BPSK) modulation...
Many space time block code (STBC) schemes have been proposed to achieve reliable communications over independent and identical distributed (i.i.d.)fading channels. However, the fading of realistic wireless channel is spatial correlated. Recently Zhou-Giannakis and Jongren-Skoglund-Ottersten proposed a new design criterion and algorithm that combined the STBC with linear beamforming assuming the transmitter...
In this paper, we present a study for the error rate performance of multi carrier direct sequence code division multiple access (MC DS-CDMA) system in conjunction with maximum ratio combining (MRC) over Nakagami-m multipath fading channel. Multiple transmit and receive antenna structures are employed at both the transmitter and the receiver sides to provide spatial diversity The multipath fading is...
Lattice reduction aided (LRA) detection with the LLL algorithm has been investigated to achieve the MIMO channel capacity with low computational complexity. This paper proposes an improved LRA-MMSE detection using the forward and the backward reduction LLL algorithms for the 8times8 MIMO to obtain more reliable estimates of the transmitted signals. The proposed method achieved much better BERs than...
In this paper, we present a precoder design framework and a computationally simple precoding technique for OSTBC based MIMO wireless systems with both transmit and receive correlations for the case of Rayleigh fading. It is assumed that the correlation among receive antennas is independent of the correlation among transmit antennas (and vice versa). The transmit and receive correlation matrices are...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.