Channel capacity for various materials of partitions in indoor ultra wideband communication system with multiple input multiple output

Applying Multiple-Input Multiple-Output (MIMO) technology in terrestrial wireless networks can obtain large capacity gain. Therefore, MIMO technology is widely applied in satellite communication system, in which orbital positions are increasingly crowded and frequency resources are of shortage. This paper attempts to research on channel capacity in 2×2 dual-polarized MIMO mobile satellite (DMMS) system and discovers that when XPD (Cross Polarization Discrimination) is above zero, the channel capacity increases approximately linearly with the XPD within certain range. Adding Ricean factor K in consideration of its special features,the system’s capacity increases with the Ricean factor K. Simulation results demonstrate that the application of MIMO technology in satellite mobile communication system can improve the channel capacity significantly, providing great support for the development of future satellite MIMO technology.

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Design of an interlocked four-port MIMO antenna for UWB automotive communications

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078721000374 ◽

2021 ◽

pp. 1-8

Author(s):

M. Saravanan ◽

R. Kalidoss ◽

B. Partibane ◽

K. S. Vishvaksenan

Keyword(s):

Multiple Input Multiple Output ◽

Performance Estimation ◽

Ultra Wideband ◽

Antenna Element ◽

Frequency Range ◽

Mimo Antenna ◽

Multiple Input ◽

Input Multiple Output ◽

Operating Bandwidth ◽

Peak Gain

Abstract The design, analysis, fabrication, and testing of a four-port multiple-input multiple-output (MIMO) antenna is reported in this paper for automotive communications. The MIMO antenna is constructed using the basic antenna element exploiting a slot geometry. Two such antennas are developed on the same microwave laminate to develop a two-port MIMO antenna. Two such microwave laminates are interlocked to create the four-port MIMO scheme. The most distinct feature of the proposed architecture is that the inter-port isolation is well-taken care without the need for an external decoupling unit. The four-port MIMO antenna has an overall volume of 32 × 15 × 32 mm3. The prototype MIMO antenna is fabricated and the measurements are carried out to validate the simulation results. The antenna offers ultra-wideband (UWB) characteristics covering the frequency range of 2.8–9.5 GHz. The average boresight gain of the antenna ranges from 3.2 to 5.41 dBi with the peak gain at 8 GHz. The simulated efficiency of the antenna is greater than 73% within the operating bandwidth. The MIMO parameters such as envelope correlation coefficient, diversity gain, and mean effective gain are evaluated and presented. The appropriateness of the proposed antenna for deployment in the shark fin housing of the present-day automobiles is verified using on-car performance estimation.

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Channel capacity and performance evaluation of precoded MIMO-OFDM system with large-size constellation

International Journal of Electrical and Computer Engineering (IJECE) ◽

10.11591/ijece.v9i6.pp5024-5030 ◽

2019 ◽

Vol 9 (6) ◽

pp. 5024

Author(s):

Hussein A. Leftah ◽

Huda N. Alminshid

Keyword(s):

Fading Channels ◽

Channel Capacity ◽

Orthogonal Frequency Division Multiplexing ◽

Multiple Input Multiple Output ◽

Ofdm System ◽

Large Size ◽

Multiple Input ◽

Input Multiple Output ◽

Mimo Ofdm ◽

And Performance

<p>Multiple input-multiple output (MIMO) is a multipath diversity exploring approach which is emerged with orthogonal frequency division multiplexing (OFDM) to produce MIMO-OFDM that is widely used in wireless communications. This paper presents a discrete Hart-ley transform (DHT) precoded MIMO-OFDM system over multipath frequency-selective fading channel with large-size quadrature amplitude modulation (16-QAM, 64-QAM and 256-QAM). A mathematical models for the BER and channel capacity over mutlipath fading channels are also derived in this paper. Average Bit-error-rate (BER) and channel capacity of the presented system is considered and compared with that of the traditional MIMO-OFDM. Simulation results shows that the transmission performance and channel capacity of the proposed schemes is better than that of the traditional MIMO-OFDM without a pre-coder.</p>

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