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Power Control Algorithms in Long Term Evolution (LTE) - Open Loop vs Closed Loop, Assignments of Wireless Communication Systems

Balochistan University of Information Technology & Management Sciences (BUITMS)Wireless Communication Systems

An overview of Power Control Algorithms in Long Term Evolution (LTE), focusing on Open Loop and Closed Loop techniques. LTE is a wireless standard for broadband communication and mobile devices based on GSM technologies. Power control is essential to manage multiple users and radio resources, maximizing spectral efficiency and minimizing interference. Open Loop Power Control does not use feedback, while Closed Loop Power Control relies on feedback for adjusting transmit power levels.

Typology: Assignments

2018/2019

Uploaded on 05/29/2022

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syed-jameel 🇵🇰

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Syed Muhammad Jameel CMS: 37042
Power Control Algorithms
Long Term Evolution:
In telecommunication the term Long Term Evolution is wireless standard broadband
commination and also for mobile devices which are based on GSM technologies. LTE
increases capacity, speed and power uses radio interface with some network improvements.
LTE has released 8 documents and with some improvements there heading towards 9 series.
In LTE which uses different bands for communication it is also known has 4G-LTE but it
known has 3.95G. LTE provides high data rate and high voice capacity and media transport.
Power Control:
Power control, controls the multi user which used multiple radio resources because of
which interference and due to the limited channels in radio network so because of that the
same network has to be assigned to multiple users that degrade the channel quality user that
has good channel quality will use low power. LTE used SC-FDMA for uplink in radio
technology, in CDMA orthogonal transmission forms interference in a same cell which limits
system performance. So, we maximize the spectral efficiency in LTE for frequency reuse
factor that is 1 for uplink and downlink so the cell uses same frequency bands in the network.
Open Loop Power Control:
In the0Open Loop Power Control, there is no feedback either from mobile to BS or
from BS to mobile. In CDMA system wherein there is dedicated pilot channel provided for
channel estimation. It is transmitted by the base station to all the subscribers. The mobile unit
receives the pilot channel and estimates the power strength. Based on this estimate, the
mobile unit adjusts the transmit power accordingly. During this open loop control, it is
assumed that both forward link and reverse link are correlated
POL is the uplink power, set by open loop power control. The choice of depends on
whether conventional or fractional power control scheme is used. Using = 1 leads to
conventional open loop power control while 0 < < 1 leads to fractional open loop power
control.
Assignment (Dr. Tariq Shah) BS-Telecom 7th
pf3
pf4
pf5

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Power Control Algorithms

Long Term Evolution:

In telecommunication the term Long Term Evolution is wireless standard broadband

commination and also for mobile devices which are based on GSM technologies. LTE

increases capacity, speed and power uses radio interface with some network improvements.

LTE has released 8 documents and with some improvements there heading towards 9 series.

In LTE which uses different bands for communication it is also known has 4G-LTE but it

known has 3.95G. LTE provides high data rate and high voice capacity and media transport.

Power Control:

Power control, controls the multi user which used multiple radio resources because of

which interference and due to the limited channels in radio network so because of that the

same network has to be assigned to multiple users that degrade the channel quality user that

has good channel quality will use low power. LTE used SC-FDMA for uplink in radio

technology, in CDMA orthogonal transmission forms interference in a same cell which limits

system performance. So, we maximize the spectral efficiency in LTE for frequency reuse

factor that is 1 for uplink and downlink so the cell uses same frequency bands in the network.

Open Loop Power Control:

In the Open Loop Power Control , there is no feedback either from mobile to BS or

from BS to mobile. In CDMA system wherein there is dedicated pilot channel provided for

channel estimation. It is transmitted by the base station to all the subscribers. The mobile unit

receives the pilot channel and estimates the power strength. Based on this estimate, the

mobile unit adjusts the transmit power accordingly. During this open loop control, it is

assumed that both forward link and reverse link are correlated

POL is the uplink power, set by open loop power control. The choice of  depends on

whether conventional or fractional power control scheme is used. Using  = 1 leads to

conventional open loop power control while 0 <  < 1 leads to fractional open loop power

control.

In this block diagram transmitted power from uplink is settled using open loop

scheme the path loss is calculated when reference symbol received power (RSRP) is

measured, transmit block in the eNB represents the broadcast of parameters namely P0 and .

Open Loop Code in MATLAB: %% open loop power control Pmax = 10log10(20); M = 0.025; % physical number of resource block (PRB) J = 12 ;%conventional open loop pn = -140; %noise power per PRB %50dB SNR = 0.0035; %open loop SNR target p = SNR + pn; %power in one PRB PTH = 0:25:600; %pathloss OpenL = min(Pmax, 10log10(M) + JPTH + p ); subplot(1,2,1); plot(PTH,OpenL) title('Open Loop'); xlabel('path loss'); ylabel('openloop'); %% open loop power control Pmax = 10log10(20); M = 0.05; % physical number of resurce block (PRB) J = 12 ;%conventional open loop pn = -240; %noise power per PRB %50dB SNR = 0.0035; %open loop SNR target p = SNR + pn; %power in one PRB PTH = 0:15:800; %pathloss OpenL = min(Pmax, 10log10(M) + JPTH + p ); subplot(1,2,2); plot(PTH,OpenL) title('Open Loop'); xlabel('path loss'); ylabel('openloop');

xlabel('correction function of closed loop F(?i)'); %closed loop varying value of coreection function "F(?i)" OpenL = 0.000075; %open loop Fi = 0:0.0044:2; %coreection function pmax = 15; J = min(pmax, Fi + OpenL); %formula of closed loop subplot(2,2,2); plot(J); title('close loop F(?i) = 2'); ylabel('closed loop'); xlabel('close loop correction function F(?i)'); %closed loop varying value of coreection function "F(?i)" pmax = 100; OpenL = 0.075; %open loop Fi = 0:-0.0000075:0; %coreection function J = min(pmax, Fi + OpenL); %formula of closed loop subplot(2,2,3); plot(J,Fi); title('close loop F(?i) = 0'); ylabel('closed loop'); xlabel('close loop correction function F(?i)'); %closed loop varying value of coreection function "F(?i)" pmax = 15; OpenL = 0.075; %open loop Fi = 0:-0.0075:-1; %coreection function J = min(pmax, Fi + OpenL); %formula of closed loop subplot(2,2,4); plot(J); title('close loop F(?i) = -1'); ylabel('closed loop'); xlabel('close loop correction function F(?i)'); Output Graph: