Performance comparison for 2 by 2 MIMO system using single leaky coaxial cable over WLAN frequency band

Abstract

In linear service areas such as a tunnel and along railways, leaky coaxial cable (LCX) is widely used as antenna for radio communication. Usually, one LCX is utilized as one antenna. Therefore it requires more than one LCX to configure an multi-input multi-output (MIMO) system. We have recently proposed a method that one single LCX can be utilized as two antennas by feeding different RF transmit signals to each end of the proposed cable. In this paper, we compare 2× 2 MIMO system performance using the proposed LCX and using conventional monopole antennas over 2.4GHz band for WLAN appliances. The results confirm that our proposed 2× 2 MIMO channel using a single LCX can realize a good channel condition and bit error ratio (BER) performance for MIMO transmission even within a highly correlated propagation condition. On the other hand, it also shows that the proposed LCX MIMO is promising technique for communications over linear-cell environments from the simulated results which considering the path loss and radiation pattern of LCX characteristics.

A study for 2-D indoor localization using multiple leaky coaxial cables

“…m is set as -1 to avoid radiated harmonics. It is possible to change the main radiation angle of the LCX cable by adjusting the direction of the slot and the value of P. Figure 2 shows the bidirectional radiation property of the LCX when inputting signals to both side of the cable without the terminating resistor [21]. Two different peak directivities are obtained and the crossing angle is about 2θ −1 degree, their radiation characteristics have low correlation with each other.…”

“…Here, one LCX cable is treated as only one antenna for usage. Researches in [21][22][23][24] show that LCX cable has bi-directional property and one LCX can be utilized as two antennas for 2-by-2 LCX multiple input multiple output (MIMO) system. In addition, a 4-by-4 LCX-MIMO system has been proposed in [25].…”

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

“…However, the quality of MIMO channel becomes worse when two cables are closely spaced. Different from a 2-by-2 LCX-MIMO system using two LCXs, the research results in [13]- [16] show that we can utilize one LCX as two antennas for the configuration of the 2-by-2 LCX-MIMO system. The results show that the peak directivity of propagation angles of LCX usually is highly relative to the signal wavelength, LCX slot period and relative permittivity of insulator.…”

Configuration of MIMO system using single leaky coaxial cable for linear cell environments

“…The results in [2] confirm that, over 2.4 GHz frequency band, the proposed MIMO channel using a single LCX cable can realize good 2 Â 2 channel condition even within a highly correlated propagation condition. The 2 Â 2 MIMO performance comparison between that using the LCX cable and using Omni-direction antenna has been reported with simulated results in [3] and with experimental evaluation in [4]. It also showed that by adjusting the period of slot, we can use one composite cable, which consists of a pair of LCX cables with different radiation directivities, to configure a 4 Â 4 MIMO channel.…”

“…We have recently proposed a method that one single LCX cable can be used as two antennas [2,3,4,5,6]. When different RF transmit signals are fed to each end of the cable, the single LCX can work as two antennas.…”