# Introduction

n wireless communication fading refers to a very unique characteristic. The variation of the signal amplitude over time and frequency is called fading. There are two types of fading, one is large scale fading and the other is small scale fading. Large scale fading comprises of path loss and shadowing. Hata model is one of the most adopted path loss models that can predict path loss in urban, suburban and open area.

Here it is shown that if the height of receive antenna is increased then the path loss decreases significantly.

Here the height of the transmit antenna is set to 30m and carrier frequencies used are 1500 MHz and 200 MHz. As in the urban area there are lots of obstructions like multistoried building or towers, therefore urban area possess more path loss than suburban and open area with the increase of distance between base station and mobile station. Open area have less obstructions and therefore less path loss than urban and suburban area. Now it will be shown that if the height of the receive antenna is increased then the path loss decreases using MATLAB simulation.   It can also be said that for same value of transmit and receive antenna height, path loss decreases after reducing the value of carrier frequency.  In Fig. 4, when distance is 100 [m] then path losses are around 72, 68 and 49 [dB] for urban, suburban and open area, respectively. But these values decrease in Fig. 5 and Fig. 6 for the same distance. In Fig. 6, path losses become around 47, 0, 0 [dB] for the same distance of 100 [m] which is a significant improvement.


# Conclusions
![a) Hata Model PL Hata, U (d)[dB] = 69. 55 + 26. 16 log fc -13. 82 log hTX -CRX + (44. 9 + 6. 55 log hTX) log d. Where, C RX is the correlation coefficient of the receive antenna, which depends on the size of coverage. For small to medium-sized coverage, C RX is given as CRX = 0. 8 + (1. 1 log fc -0.7) hRX -1. 56 log fc Where, h RX [m] is the height of transmit antenna. For large-sized coverage, C RX depends on the range of the carrier frequency, for example, CRX = 8. 29 (log (1. 54 hRX)) 2 -1. 1 if fc is in between 150 MHz -200 MH z CRX = 3. 2 (log (11. 75 hRX)) 2 -4. 97 if fc is in between 200 MHz -1500 MHz Meanwhile, the path loss at distance d in suburban and open areas are respectively given by the Hata model as PL Hata, SU (d)[dB] = PL Hata, U (d) -2 (log fc/28) 2 -5. 4 PL Hata, O (d)[dB] = PL Hata, U (d) -4. 78 (log fc) 2 + 18. 33 log fc-40. 97](image-2.png "")
![done to establish the concept which is proposed in this paper. At first the height of the transmit antenna is set to 30 [m] and carrier frequency is set to 1500 MHz. The height of the receive antenna will be varied from 2 [m] to 50 [m]. Now the generated output curves of path loss versus distance for urban, suburban and open area are shown Among many other radio propagation models, Hata model is currently the most popular path loss model. For the height of transmit antenna, h TX [m], and the carrier frequency of f c [MHz], the path loss at distance d [m] in an urban area is given by the Hata model as: Year 2014 Significance of Increasing the Receive Antenna Height in Reducing Path Loss for Hata Path Loss Model](image-3.png "")
123![Figure 1 : Path loss vs. distance curves when receive antenna height is 2 [m]](image-4.png "Figure 1 :Figure 2 :Figure 3 :")
4![Figure 4 : Path loss vs. distance curves when receive antenna height is 2 [m]](image-5.png "Figure 4 :")
5![Figure 5 : Path loss vs. distance curves when receive antenna height is 30 [m]](image-6.png "Figure 5 :")
6![Figure 6 : Path loss vs. distance curves when receive antenna height is 50 [m] III.](image-7.png "Figure 6 :")
			© 2014 Global Journals Inc. (US)
		
		
			

## IV .

In this paper we tried to show the relation between the path loss and the height of receive antenna. It is evident that, path loss decreases with the increase of receive antenna's height. But in practice, this is not quite feasible enough in case of our cell phone. Because it is not possible to increase the height of its antenna to a significant amount as it will increase the cell size and weight. That is why sometimes external antennas are provided with the cell phones. So, the height of receive antenna should be increased to reduce the path loss to a significant amount.
			
			

				


* 
	
		
			YongSoo Cho
		
		
			JaekwonKim
		
		
			WonYoungYang
		
		
			ChungGKang
		
		MIMO-OFDM Wirelss Communications With MATLAB
				
			2010
		
	




* 
	
		
		
			JMatlab Guide By Desmond
		
		
			NicholasJHigham
		
		
			Higham
		
		
			2005
		
	




* 
	
		The history of land to mobile radio Technology
		
			DNobel
		
		
			May 1962
			
		
	




* 
	
		The cellular concept
		
			HMacdonald
		
	
	
		The Bell Systems Technical Journal
		
			58
			1
			
			January 1979
		
	




* 
	
		Empirical Formula for Propagation Loss in Land Mobile Radio Services
		
			SRSaunders
		
		
			MHata
		
	
	
		IEEE Transactions on Vehicular Technology
		
			29
			August 1980
		
	
	IEEE Transactions




* 
	
		On the Use of the Universal Okumura-Hata Propagation Predication Model in Rural Areas
		
			AMedeisis
		
		
			AKajackas
		
	
	
		Vehicular Technology Conference Proceedings
				
			May 2000
			3