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We have proposed a method which realizes collision detection by utilizing 2-by-2 multi-input multi-output (MIMO) transmission in wireless LAN systems. We assume the collision due to multiple short preamble signals. In the proposed method, We utilize a fact that the short preamble signal is transmitted from only first antenna. Then, an access point (AP) can detect interference signals by using a second...
This paper proposes a target position estimation method in short range using multiple antennas and frequencies. It is shown that the position estimation accuracy is improved by increasing the spacing adjacent to the radiating element and utilizing the plural frequencies.
Recently, the direction-of-arrival (DOA) estimation using an array antenna has been studied extensively. Accordingly, array calibration method has also become an important topic. Conventional data acquisition methods often require a positioner or an azimuth table to make sources of known DOAs for pre-measurement of array calibration in a radio anechoic chamber. However, such a measurement is both...
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