Novel compact antennas for MIMO wireless communication systems

Line-of-sight (LoS) multiple-input multiple-output (MIMO) gives full spatial-multiplexing gain when the antenna array geometry and orientation are designed based on the interterminal distance. These known design methodologies, that hold for antenna arrays with fixed orientation, do not provide full MIMO gains for arbitrary array orientations. In this paper, we study LoS MIMO channels with random array orientations when the number of transmit antennas used for signalling is 2. We study the impact of common array geometries on error probability, and identify the code design parameter that describes the high signal-to-noise ratio (SNR) error performance of an arbitrary coding scheme. For planar receive arrays, the error rate is shown to decay only as fast as that of a rank 1 channel, and no better than SNR −3 for a class of coding schemes that includes spatial multiplexing. We then show that for the tetrahedral receive array, which uses the smallest number of antennas among non-planar arrays, the error rate decays faster than that of rank 1 channels and is exponential in SNR for every coding scheme. Finally, we design a LoS MIMO system that guarantees a good error performance for all transmit/receive array orientations and over a range of inter-terminal distances.Index Terms-Antenna array, array geometry, coding scheme, line-of-sight (LoS), multiple-input multiple-output (MIMO), probability of error.

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A novel compact antenna for broadband MIMO

Karasawa

2011

2011 2nd International Conference on Wireless Communication, Vehicular Technology, Information Theory and Aerospace &Amp; Elect

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In this paper, a simple broadband antenna in a compact size is firstly proposed. Antenna configuration and its characteristics such as VSWR, radiation patterns, and gain have been explored and discussed. The measured results illustrate that the proposed antenna offers a bandwidth of over 50% for VSWR less than 2. It also has high cross-polarization levels, and good gains -varying from about 0.5 dBi to 4.5 dBi in the whole entire bandwidth. Moreover, we introduced some similar broadband antennas which also offer relative bandwidth of over 50% at different centre frequencies. These antennas can be easily obtained by adjusting some simple geometrical parameters without changing material or substrate's thickness. Secondly, we propose a simple and compact two-port broadband array which is based on the elemental design. The mutual coupling of ports of the array is kept around -10 dB at the low frequence band and around -20 dB at the high frequence area of the array's bandwidth. The proposed broadband antennas are promissing for wideband applications such as broadband MIMO systems.

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Novel compact antennas for MIMO wireless communication systems

Cited by 3 publications

References 7 publications

Some study on design novel compact antenna for WLAN systems

Some study on design novel compact antenna for WLAN systems

Line-of-Sight $2 \times n_r$ MIMO With Random Antenna Orientations

A novel compact antenna for broadband MIMO

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