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It had originally been shown in the literature that a MIMO full/thin array radar system (consisting of a full transmit linear array of N elements having λ/2 spacing and a collocated, parallel, linear thinned receive array having Nλ/2 spacing) is equivalent to a full array of N2 elements having λ/2 spacing and thus achieves N times the accuracy and resolution as a conventional full array of N elements,...
Contrary to claims made Multiple Input and Multiple Output (MIMO) radars do not provide an order of magnitude or better angle resolution, accuracy and identifiability (the ability to resolve and identify targets) over conventional radars. This claim for MIMO results from making the wrong of a full/thin MIMO array to a full conventional array rather than to a conventional full/thin array. It is shown...
The performance of wireless communication systems in difficult radio conditions needs to be enhanced. More and more systems use indeed advanced antenna techniques to do so. Especially one type of advanced antenna technique, beamforming, is found more and more often and presented as the promising overall answer to increase performance. The theory of beamforming is quite well known since a while, but...
Contrary to claims made Multiple Input and Multiple Output (MIMO) radars do not provide an order of magnitude or better angle resolution, accuracy and identifiability (the ability to resolve and identify targets) over conventional radars. This claim is based on using a MIMO array radar system consisting of a full transmit array and thinned receive array (or vice versa; called here a full/thin array)...
Contrary to claims made Multiple Input and Multiple Output (MIMO) radars do not provide an order of magnitude better angle resolution, accuracy and identifiability over conventional radars. What is claimed: MIMO array radar system consisting of a full transmit array and thinned receive array (or vice versa; called here a full/thin array) provides an order of magnitude or more of accuracy, resolution...
Selective adaptive arrays signal processing and selective space-time coding signal processing can reduce the implemental complexity of developing MIMO systems in practice while still having benefits of multiple arrays. In this paper, we evaluate the performance of selective adaptive arrays signal processing and selective space-time block coding signal processing and compare their performance under...
The goal of this paper is to: identify, assess, analyze and quantify some aspect and parameters of wave propagation, in conjunction with antennas that affect the 3GPP LTE (Long Term Evolution). Aspects such as propagation environment were networks possibly operate, or characteristics of the antennas that are able to increase the performance of LTE networks using MIMO and Adaptative Antennas. Using...
In mobile communication environment, the wireless channel is time varying due to the mobility of the wireless terminal and multi-path propagation. It has been shown that MIMO will give multiplexing gain and/or better quality of service. It has also been proved that AAS can provide improved spectral efficiency because AAS uses spatial multiplexing technique. This paper proposes an algorithm for reconfigurable...
A novel reconfigurable two elements antenna array for IMT-advanced MIMO system is proposed. The array includes two microstrip antennas with two PIN diodes respectively. By switching the states of PIN diodes, the available part for radiation can be changed, and each antenna element can operate on two operation bands, two orthogonal polarizations and has distinct radiation patterns. Each antenna element...
We propose a new technique for multiple-input multiple-output (MIMO) radar with colocated antennas. The essence of the proposed technique is to partition the transmitting array into a number of subarrays that are allowed to overlap. Each subarray is used to coherently transmit a waveform which is orthogonal to the waveforms transmitted by other subarrays. Coherent processing gain can be achieved by...
This review paper envisages use of multiple antenna elements in wireless communication over frequency non-selective radio channels. Various upcoming transmit strategies are discussed and compared to existing strategies such as beam forcing and space time block coding. It is revealed through this paper that the performance of transmission algorithm is largely dependent on channel characteristics such...
Smart/adaptive array antenna can track the unknown interference signal in real time automatically, that is, it can direct antenna pattern with nulls towards the interference and offer gain to the required signal to ensure the required signal reception, so output SINR (signal to Interference and Noise Ratio) is improved. Direction-of-arrival (DOA) estimation is based on the MUSIC algorithm for identifying...
This paper studies efficient complex valued matrix manipulations for multi-user STBC-MIMO decoding. A novel method called Alamouti blockwise analytical matrix inversion (ABAMI) is proposed for the inversion of large complex matrices that are based on Alamouti sub-blocks. Another method using a variant of Givens rotation is proposed for fast QR decomposition of this kind of matrices. Our solutions...
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