An Experimental Investigation of the MUSIC-based Wireless Position Location using LCX antenna at 5GHz band

Abstract

In recent years, a wireless system using LCX (Leaky CoXial cable) antenna has been studied as a method of locating a wireless terminal in indoor. As typical method, the IFFT (Inverse Fast Fourier Transform) of the channel frequency response is available for obtaining channel impulse response, then, local position can be estimated based on the TDOA (Time Difference Of Arrival). Although spacial resolution of positioning is limited by measured bandwidth of frequency response, the MUSIC (MUltiple SIgnal Classification) algorithm has been proposed to overcome its limitation [1], [2]. Previous study [3] employed the MUSIC algorithm in 2 by 2 LCX antenna system at 2.4 GHz band, and its precision has been evaluated experimentally. Since the LCX antenna has newly developed for 5 GHz, positioning performance at 5GHz band has evaluated in this paper. After the channel response was measured in the radio anechoic chamber, and its precision is experimentally evaluated.

New Signal and Algorithms for 5G/6G High Precision Train Positioning in Tunnel With Leaky Coaxial Cable

“…It's obvious that the LCX slot spacing doesn't significantly affect performance of the MSD algorithm. This is because the effect of the LCX slot spacing on pseudo spectrum has already been identified as (19) shows. Therefore, the proposed MSD algorithm can work regardless of the LCX structure.…”

“…It also shows that the performance of the MSD algorithm improves as bandwidth increases. This is because with larger bandwidth, more available frequency points are calculated in (19), which results in higher time resolution. In addition, it can be observed that the performance of the MSD algorithm becomes saturate when SNR becomes larger as the dominate factor becomes the signal resolution rather than the noise.…”

“…The MUltiple-SIgnal-Classification (MUSIC)-based LCX positioning methods treat the frequency samples as the antenna array elements in conventional MUSIC. Then, a pseudo spectrum is generated by using steering vectors with different time delays and the noise sub-spaces decomposed from the received signal to estimate the time delay of signal [19], [20], [21]. However, the signals radiated from different slots on LCX couple to each other [22], [23].…”

Position Estimation in Corridors Along the Coupled Mode of Radiating Cables

“…Shirai et al [ 22 ] proposed another method of position estimation using two radiating cables. Both cable ends were connected to four-port receiver.…”

Capacity Loss From Localization Error in MIMO Channel Using Leaky Coaxial Cable

“…In [24] and [25], a wideband Boolean-chaos signal based on user localization has been studied for MIMO system with a pair of LCXs. References [26] and [27] show a localization detection method in LCX-MIMO using the multiple signal classification (MUSIC) algorithm. Reference [28] provided a different LCX combination for higher localization precision.…”