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Antenna Hopping
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Antenna hopping

Jul 08, 2015

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Page 1: Antenna hopping

Antenna Hopping

Page 2: Antenna hopping

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INTRODUCTION

› Sometimes it so happens that while in a dedicated mode a MS falls in the fading dip of the received signal.Then there is a high probability of the call getting disconnected.So in order to overcome this problem you have to transmit the signal over different paths.This means introducing diversity in the transmit path.This can be done using ANTENNA HOPPING. With antenna hopping, transmit diversity is introduced by altering transmit antenna between bursts.

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AREA OF IMPLEMENTATION……

› In the channels which doesnot have frequency hopping

(e.g. BCCH).› It is used for traffic channels with frequency hopping over

a relatively low number of frequencies (less than 8).› This feature brings about a considerable amount of

signal strength improvement in slow/non-moving mobiles than the fast moving mobiles.

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Advantages of Antenna Hopping

› It can be used without increasing the number of TRXs in a base station.

› More robust radio environment.› Improved signaling performance.› Possibility to give subscribers a more uniform speech

quality.

› It can also be used along with Frequency Hopping.

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WORKING PRINCIPLE OF ANTENNA HOPPING

The combinations of the same signal from two different transmit paths results in averaging out their fading dips at any particular distance and thus helps us to get a fairly uniform signal strength at any point.

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ANTENNA vs FREQUENCY HOPPING

ANTENNA HOPPING

With antenna hopping and no frequency hopping, the same interference is present in all bursts.This means that only the fast fading changes between the bursts resulting in only averaging out the fading dips of that signal at any point.

FREQUENCY HOPPING

In it a mobile is interfered by different base stations in different bursts, i.e. “interference diversity”.Thus results in averaging out the interference of that channel from other channels.

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EFFECTS ON CODECS

› GAINERS

EFR, AMR, GPRS CS1 and CS2 as well as EGPRS

MCS-1, MCS-2, MCS-5 and MCS-6.

› SUFFERERS

EGPRS MCS-4 and MCS–9.

› NO EFFECT

MCS-3, MCS-7 and MCS-8.

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ANTENNA HOPPING-- A SPECIAL CASE

› PROBLEM

This technique of altering antenna on every burst is not going to work in case of HR channels as this would result in no transmit diversity in a two antenna configuration.

› SOLUTION

By transmission of the first two bursts via the first antenna and the next two bursts via the second antenna and so on, the antenna hopping gain will be achieved for half rate channels as well.

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REQUISITES OF ANTENNA HOPPING

› An antenna hopping enabled configuration needs two transmit antennas or a dual-polarized antenna in at least one antenna system.

› Antenna Hopping can be enabled in a TG and not sectorwise.

› It is of importance that all antennas in a cell are pointing in the same direction otherwise the measured average signal strength will decrease which may cause change of cell borders as shown in the next slide.

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Page 11: Antenna hopping

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ALGORITHM USED IN ANTENNA HOPPING

› Antenna hopping is started on each Antenna Hopping Set(AHS) when the AHSs has been created.The hopping is performed such that the following pattern is achieved:

• Target antenna = (FN + (FN DIV 2)) MOD 2, if the number of antennas is two. Note: This pattern is selected to achieve transmit diversity gain even for half rate channels, where the channel is sent every second burst

• Target antenna = FN MOD Nant, if the number of antennas is three or more.

where FN = Frame Number and Nant = number of antennas.

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ANTENNA HOPPING GAIN

› The gain from Antenna Hopping depends on

1. Propagation Environment,

2. Signal Strength,

3. Number of antenna to hop on,

4. Number of hopping frequencies,&

5. Interference Characteristics.

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ANTENNA HOPPING GAIN contd….

› The following table can be used as an approximation for the expected gain from antenna hopping in a typical urban (TU) environment. The expected gain in other environments may be smaller.

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A CASE STUDY ON EFFECTS OF ANTENNA HOPPING

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CONCLUSION

› Thus Antenna Hopping is a great feature to work with which will help us improve the signal strength at any point by averaging out the fading dips at that point.This feature makes use of the transmit diversity.

› There is a cellwise parameter AHOP which turns this feature ON or OFF.The settings of this parameter is as below.

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