Abstract
Leaky coaxial (LCX) cable has been employed as antennas for wireless traffic over many linear-cell scenarios such as railway station, tunnels and shopping malls. In addition, LCX can be used for user localization and wireless power transfer (WPT). Compared with the equal power allocation method, the power allocation method for LCX system using positional information (PI) can improve its capacity with the same level of computational complexity. In this paper, we will investigate the level of capacity loss on the 2.4 GHz and 5 GHz band for the conventional equal power (EP) allocation method, the water-filling (WF) based power allocation, and our proposed low-complexity power allocation method for LCX system with PI. The results show that LCX system with our proposed method using PI can reduce the capacity loss due to localization error than that of others.
Highlights
The 5th generation (5G) wireless technology has greatly promoted the development of real-time control, data acquisition and IoT technology by establishing the interactive connection among large numbers of devices, mobile terminals, various sensors and robots [1]
In order to investigate the practicability of the proposed power allocation method and the level of system capacity loss, in this paper, we study the relationship between the Leaky coaxial cable (LCX)-MIMO channel capacity loss and the position detection error when using the proposed power allocation method
In order to make the performance of the channel capacity more representative in this research, we study the channel capacity under both line of sight (LOS) and nonline-sight (NLOS) propagation paths with the geometrically based single-bounce (GBSB) MIMO model for LCX-MIMO system [29]
Summary
The 5th generation (5G) wireless technology has greatly promoted the development of real-time control, data acquisition and IoT technology by establishing the interactive connection among large numbers of devices, mobile terminals, various sensors and robots [1]. In addition to the TOA method, researches in [20] and [21] developed a method using the time difference of arrival (TDOA) between the signal arrival at two ends of LCX to detect the location of the user. Compared with conventional monopole antennas, LCX usually has a constant coupling loss This property can be further used for transmitting power allocation using the information of user locations. In [30], the authors design and realize a 4-by-4 MIMO channel with one composite LCX It has proposed and analyzed a transmission power allocation method with low computational complexity utilizing the user’s positional information. The proposed method can improve the capacity of the LCX-MIMO channel with almost the same computational complexity as the conventional equal power allocation method (EP). It is possible to change the main radiation angle of the LCX by adjusting the direction of the slot and the value of P
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