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In this paper a spatially and temporally clustered channel model is proposed to be applicable to Wireless Local Area Network (WLAN) MIMO systems based on circular antenna arrays (UCA). Properties of multipath taps along with angular and power values of clusters are included in this model to consider wideband signal with frequency selective fading channels. Link performance of systems that utilize...
In this paper, we propose the cell-based MIMO single frequency network to enhance the channel capacity. And we present an analysis of capacity of a frequency selective fading channel according to a number of antennas and position of the receiver in the proposed network. It is a base of investigation for 3D-HDTV terrestrial broadcasting.
In this paper, we present an iterative joint channel estimation and data detection technique for multiple-input multiple-output (MIMO) code-division multiple-access (CDMA) systems over frequency-selective fading channels. Based on the expectation-maximization (EM) algorithm, the proposed iterative receiver achieves a performance close to the optimum maximum-likelihood (ML) receiver. In addition, the...
Multi-user multi-input multi-output (multi-user MIMO) can increase the number of users simultaneously accessing the same base station (BS) without increasing the signal bandwidth. MIMO signal detection which can provide better bit error rate (BER) performance than linear detection with less computational complexity is indispensable in order to enhance the uplink cellular capacity of multi-user MIMO...
In this paper, we consider design optimization of low-density parity-check (LDPC) coded multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems for high data rate wireless transmission. First, starting from the maximum-likelihood (ML) principle, we devise a novel expectation-maximization (EM)-based scheme for joint estimation of carrier frequency-offset (CFO)...
The performance of spatial multiplexing-based multiple-input multiple output (MIMO) systems using zero forcing (ZF) detector in frequency selective fading channels is analyzed in this paper. The approximation of a linear combination of Wishart matrices is used to derive the probability density function (p.d.f.) of output signal-to-noise ratio (SNR) expression. Analytical error rate expressions for...
The throughout of wireless communication systems can be improved by adding multiple antennas at the transmitter and receiver to create multiple-input multiple-output channels. To avoid the prohibitive complexity involved in the ML detectors, some special detectors were proposed to improve the performance-complexity trade-off, such as zero-forcing (ZF), minimum mean-square (MMSE), vertical Bell labs...
This paper studies the relationship between spatial and temporal entities of the space-time processing (STP) for multiple-input multiple-output (MIMO) wireless communications in a frequency-selective fading channel. Analysis based on the zero-forcing criterion suggests that minimum number of the spatial receive antenna, N, and the temporal equaliser tap, (K+1) of the `beamformer-equaliser' can be...
4G wireless systems predominately employ multiple input multiple output (MIMO) with an orthogonal frequency division multiplexing (OFDM) system. Like other 4G systems long term evolution (LTE) also employs MIMO-OFDM physical layer. MIMO helps in increasing the throughput whereas OFDM converts a frequency selective fading channel to multiple flat fading sub-channels facilitating easy equalization....
In this paper, a 2times2 MIMO-OFDM digital baseband receiver for IEEE 802.16 WMAN-OFDM PHY is presented. The inner receiver design includes the timing and carrier frequency synchronization, the channel estimation and the MIMO detection with adaptive equalization technique. In order to enhance the robustness of the system, the BLMS algorithm is derived to track the channel variation for the Alamouti-scheme...
Alamouti's Space-Time Block Coding (STBC) scheme has received considerable attention due to its ability to maximize the diversity gain of a Multi-Input-Multi-Output (MIMO) transmission link. For frequency selective fading, only a few receivers can be found in the literature. These are mainly trained and block based, such as Time Reversal STBC (TRSTBC), introduced by [3], [4]. In order to ultimately...
In this article, we introduce a blind MIMO communication scheme allowing the transmission over a frequency selective channel based on the turbo deflation described in [1]. Our proposed method is based on an iterative receiver. We incorporate an error correcting code in our method of source separation. Our new method consists simply in combining our initial method and a turbo decoder. We show that...
This paper addresses maximum-likelihood (ML) time synchronization algorithm joint with channel estimation for MIMO-OFDM systems in frequency selective fading channels. For this purpose a SISO joint maximum likelihood (ML) synchronization algorithm with channel estimation is extended and generalised to MIMO systems. Timing failure probability is presented as a criterion to illustrate the robustness...
As a soft-input soft-output detection scheme for multiple-input multiple-output (MIMO) channels, the stochastic sequential Monte Carlo (SSMC) method generates MlMO symbol samples based on importance sampling and resampling techniques. In this paper, the MIMO system, with the SSMC detection, is incorporated with the orthogonal frequency division multiplex (OFDM) and turbo channel coding to undertake...
Carrier interferometry (CI) may be used to spread OFDM symbols over all N subcarriers to exploit frequency diversity without loss in throughput. In this paper, we implement the OFDM (uncoded and coded) system incorporated with the carrier interferometry and VBLAST (Vertical Bell Laboratories layered Space-Time) to undertake performance comparison in frequency selective fading channel. It is shown...
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