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.
In order to achieve array gain and spatial diversity or multiplexing gain simultaneously, a novel joint beamforming based on MIMO and array antenna techniques, referred to as J-BF, is proposed for the LTE and Wifi downlink. Array gain is achieved from array antenna based beamforming, referred to as AA-BF. Spatial diversity and multiplexing gains are achieved from MIMO based beamforming, referred to...
In a multichannel system, the transmitter can perform precoding techniques to alleviate the effects of fading and interference. However, the precoding transformation matrix usually results in high peak to average power ratio (PAPR). In order to avoid inefficiently operating the power amplifier, for a precoded multi-input multi-output (MIMO) system, we consider using a PAPR reduction method based on...
The performance of coded MIMO systems can be enhanced by effectively utilizing soft iterative estimation techniques at the receiver. The main concern on this iterative techniques is computational complexity and feasibility of the hardware implementation. This paper evaluates a number of soft iterative MIMO detection schemes in terms of the bit error rate performance as well as computational complexity...
Motivated by the demand for energy-efficient communication solutions in the next generation cellular network, a mixed-ADC receiver architecture for massive multiple input multiple output (MIMO) systems is proposed, which differs from previous works in that herein one-bit analog-to-digital converters (ADCs) partially replace the conventionally assumed high-resolution ADCs. The information-theoretic...
In this paper, we utilize the knowledge of frame type and structure combined with multimode precoded MIMO transmission scheme for video stream, in order to achieve a better tradeoff of physicl layer performance (eg., SER) and the transmission delay via a proposed two-stage selection algorithms. The algorithm adaptively selects the optimal transmission mode (DIV or MUX) and the corresponding precoder...
In this paper, we present a zero-forcing (ZF) attack on the physical layer cryptography scheme based on massive multiple-input multiple-output (MIMO). The scheme uses singular value decomposition (SVD) precoder. We show that the eavesdropper can decrypt/decode the information data under the same condition as the legitimate receiver. We then study the advantage for decoding by the legitimate user over...
Pilot signal reuse in neighboring cells causes the pilot contamination, and performance will degrade significantly in a multi-cell, massive MIMO uplink system. In this paper, based on Principle Component Analysis (PCA), Independent Component Analysis (ICA) and a few pilot signals, a new decoding method is proposed. In this method, we implement the PCA to reduce the dimension of the received signals...
Non-orthogonal multiple access (NOMA) has been attracting a lot of attention as a promising downlink multiple access scheme for LTE enhancements and 5G. This paper introduces an overview of the concept, performance evaluation gains and our experimental trials related to NOMA. The goal is to clarify the benefits of NOMA over orthogonal multiple access (OMA) such as OFDMA adopted by Long-Term Evolution...
An Intelligent Distributed Channel-Aware Medium Access Control (IDCA-MAC) protocol is proposed for Home Area Network (HAN), in general, and for Electrical Devices Networks (EDN), in particular, in smart grids. In an EDN, electrical devices generate critical packets, and these must be communicated to their respective mesh clients. The proposed IDCA-MAC protocol employs simultaneous transmission of...
WLAN IEEE 802.11n is recent wireless data communication technology which provides high throughput and high performance. These features are definitely determined by the strength of MIMO decoder. The existing MIMO decoder of WLAN 802.11n is based on linear method, i.e Zero Forcing (ZF) and Minimum Mean Square Error (MMSE). Both of them are low in complexity but poor in performance. In the other hand...
We propose a novel EGC-STBC for a 2×2 MIMO VLC network. Compared with traditional STBC, the proposed scheme obtains similar performance with lower computation complexity. A throughput of 1.8Gbit/s is achieved, which demonstrates the feasibility for local area network applications.
In this paper we study the effect of the channel estimation error on the performance of successive group decoding (SGD) schemes. The contribution of this paper is to evaluate the performance of such systems in the interference MIMO channel environment. Precisely, we aim to assess the sensitivity of such decoding techniques to the imperfect estimation of the channel state information (CSI). The system...
Multiple-input multiple-output (MIMO) systems are commonly used in wireless communications to ensure high bit-rate and high capacity transmission. Space time block coding (STBC) is a technique used in MIMO to provide transmit diversity in communication over fading channels. Although STBC has full diversity gain, the coding gain need to be improved by using channel coding such as low density parity...
The list demapper has been widely employed for coded multiple-input multiple-output (coded-MIMO) receivers, where only a list of signal vectors is examined in the calculation of likelihood ratio. In the literature, the search of list is operated in the symbol level in accordance with a search metric defined as a function of signal (symbol) vector. Since a signal vector is mapped from a group of (coded)...
In this paper, a low complexity overlapped cluster search algorithm which is employed in MIMO detection is proposed. The proposed algorithm allows more than one clusters possess the same candidate constellation points to decrease the possibility of choosing the wrong cluster while picking candidates. The proposed algorithm can maintain performance within 0.57dB such that the method is suitable for...
A new performance abstraction method for the Maximum Likelihood Decoder (MLD) in the Multiple-Inputs Multiple-Outputs (MIMO) channel is presented. The method is based on a model of the iterative equalize and de-map decoder for MIMO channel and abstracts the performance of the MIMO link into a set of effective Signal-to-Noise power Ratio (SNR) values corresponding to the different streams. The proposed...
Among the linear precoding techniques block diagonalization (BD) based schemes are well-known transmit strategies employed in the downlink of multiuser MIMO (MUMIMO) systems. Employing BD type precoding algorithms at the transmit side suppresses multi-user interference (MUI) by converting a MU-MIMO broadcast channel into multiple single-user MIMO (SU-MIMO) channels and then decomposing the SU-MIMO...
Driven by multimedia based applications, the future wireless systems require high data rate capable technologies. WiMAX has attracted immense interest globally for next generation wireless communication. The requirement of a spectrally efficient modulation technique and power efficient forward error correction scheme are key factors for these technologies. Wireless link quality is determined by transmission...
This paper considers the joint maximum likelihood (ML) channel estimation and data detection problem for massive SIMO (single input multiple output) wireless systems. We propose efficient algorithms achieving the exact ML non-coherent data detection, for both constant-modulus constellations and nonconstant-modulus constellations. Despite a large number of unknown channel coefficients in massive SIMO...
We propose an efficient iterative multiple-input multiple-output (MIMO) detection algorithm based on the local search. Specifically, since the MIMO channel matrix twists the lattice structure of the received symbols, the proposed channel-aware local search (CA-LS) defines its search neighborhood according to the instantaneous channel realization. Such channel-dependent neighborhood can be efficiently...
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.