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This paper investigates the implementation scenario of Space Division Multiple Access(SDMA) which is a notable application of Multiple Input Multiple Output(MIMO) system. SDMA is one of the most promising techniques aiming at solving the capacity problem of wireless communication systems and achieving higher spectral efficiency, depending on multiplexing signals based on their spatial signature. This...
In this paper, the information extracted from Single-Input Multiple-Output sounding measurements is used to study the effect of several aspects of the receive antenna arrays on system performance. The extracted multipath parameters are used to synthesize the MIMO channel matrices of a hypothesized communication system having a fixed microcellular base-station and a handheld terminal moving throughout...
The paper presents realization of 4 channel incoherent MIMO system operating over 4.4 km of 50 μm core silica GI MM fiber. At the transmitter side, there were generated four uncorrelated pseudorandom binary sequences (PRBS) of lengths 2^7-1 that modeled short length line codes. These binary signals independently drove four QPSK modulators and 4 transmitter lasers. RML launches with different offsets...
Multiple input multiple output (MIMO) communication architecture has spectral efficiencies far beyond those offered by conventional techniques, and is greatly to increase the channel capacity. In this paper, we investigate the MIMO channel capacity in correlated channels using the uniform angular distribution, numerical simulations are performed with Matlab to verify the proposed formula. We prove...
Consider a MIMO interfering broadcast channel (multi-cellular network) where each base station transmits signals to the users in its own cell. The basic problem is to design linear transmit/receive beamformers that can maximize the system throughput in the presence of both inter and intra cell interference. To ensure user fairness in the system, we consider the joint user grouping, power allocation...
Being reliable and real-time, are the two most challenging requirements of wireless sensor and actuator networks (WSAN) due to the shared, error-prone and nondeterministic behaviour of wireless communication medium. In this paper, an adaptive data-rate and space-time coding (STC) scheme has been proposed for the IEEE 802.11-based Soft-Real-Time WSAN's utilizing Enhanced Distributed Channel Access...
The MIMO system convincingly promises a better bit rate in comparison with a SISO system. The system gets even efficient when OFDM is implemented with MIMO to obtain better data rates even in hostile channel environment. Research establishes OFDM as a potential candidate for use in MIMO systems for the reasons like inherent FFT, waveform adaptation, advanced antenna techniques, multiple access, interoperability,...
MIMO antenna design is one of biggest issues in the LTE deployment. The multiple antennas should be designed compactly without sacrificing radiation efficiency and spatial correlation. Such multiple antennas can be achieved with polarization antennas or decoupling elements. Conventionally, these antenna parameters are designed empirically. In this paper, a method to optimize multiple antenna directivities...
This paper presents the method to minimize the inter-element mutual coupling in a pair of suspended plate antennas by optimization of the orientation and feed configuration of antenna elements. By reducing the interelement mutual coupling, the envelope correlation coefficient can be suppressed for multiple-input multiple-output (MIMO) antenna systems.
In this paper, a Multi-Input Multi-Output (MIMO) antenna is proposed. The isolation characteristic of proposed MIMO antenna between two radiating elements is improved by using a Split Ring Resonator (SRR) array structure. The fabricated antenna satisfied the 10 dB return loss requirement and the isolation between the two radiating elements was higher than 15 dB in the Mobile-WiMAX frequency band....
This paper reports a research testbed of real-time ultra-wideband (UWB) multiple-input multiple-output (MIMO) radio. In the receiver design, the UWB MIMO receiver supports up to eight channels, where each channel is equipped with an analog-to-digital converter (ADC) with 8-bit resolution and sampling rate up to 3 Giga samples per second (Gsps). The transmitter is able to transmit two independent arbitrary...
Estimation of Multi Input Multi Output (MIMO) channels can be performed by Artificial Neural Network (ANN)s such as Multi Layer Perceptron (MLP)s. However, the cost of training overload in case of time varying MIMO channels is the main bottleneck of such ANN architectures for which a viable alterative, namely, the Recursive Recurrent Network (RNN) is explored. Although for tightly coupled real and...
The handling of the radio channel is an important aspect that determines the working capability of a mobile communication system. Since the channel behavior is influenced by the environment, which leads to a different behavior in different environment, the antenna design (synthesis) becomes environment dependent (time-variant) as well. In this paper, a capacity maximizing approach to design antenna...
Being an important wireless communication technique, multiple input multiple output (MIMO) system can effectively increase channel throughput by spatial multiplexing. However, the performance of a MIMO system can be further improved through adaptive modulation and intelligence antenna techniques. The affiliation of a controller can save power and diminish mechanical consumption with a guaranteed bit...
We address the main technical challenge encountered in the practical implementations of full-duplex MIMO relays, i.e., how to mitigate efficiently the self-interference that loops back from the relays transmit antenna array to its receive antenna array. In particular, we consider spatial-domain suppression using optimal eigenbeamforming that minimizes the power of the residual self-interference signal...
The use of low-density parity-check (LDPC) codes over the multi-input multi-output (MIMO) channels has shown the performance to be achieved to the capacity limit. For the 2 × 2 MIMO system, the Golden codes were recently developed as the optimal space-time codes with a full rate and a full diversity gain. In this paper, we give the detailed system design for the concatenated coding scheme, which consists...
In this work multistage MIMO equalization and source separation method is adapted to operate as a successive interference cancellation (SIC) scheme to improve the quality of received signal in a high interference environment. In a 3-stage setup, after capturing the signal of interest (SOI), interference is estimated and cancelled at second stage. After cancellation of the interference, the last stage...
Mobile optical wireless has so far been limited to very short ranges for high data rate systems. It may be feasible to overcome the data rate limitations over large transmission range in optical wireless through camera receivers and light emitting transmitter arrays through a concept what we call “visual MIMO”. In this concept multiple transmit elements of a light emitting array (LEA) are used as...
In highly spatially correlated channels the diversity gain achieved by space-frequency (SF) coding is significantly low. Nevertheless, when full or partial channel state information is available at the transmitter, improved performance can be obtained by combining transmit beamforming with SF coding. In this paper we propose two novel transmit beamforming techniques based on the minimum pair-wise...
In this paper, we consider user selection algorithms for Multi-user MIMO systems with perfect or partial channel state information at the transmitter (CSIT). A novel user selection algorithm based on chordal distance is proposed. The basic principle is to serve the user subset in which one is approximately orthogonal to the others. Since the chordal distance relies only on the channel direction information,...
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