By Under the supervision ofNutan Sharma Dr Manoj Kr ShuklaM.Tech Final year Dept of Electronics EnggRoll No.5904530009 H.B.T.I. Kanpur, India

Dissertation presentation on

INTRODUCTION

HISTORY OF POWER LINE COMMUNICATION (PLC)

OPERATING PRINCIPLE OF PLC

POWER LINE AS A COMMUNICATION CHANNEL

MODULATION SCHEMES USED WITH PLC

ADVANTAGES OF POWERLINE COMMUNICATION

IDMA SCHEME

IDMA OVER POWER LINE CHANNEL

SIMULATION RESULTS

CONCLUSION & FUTURE SCOPE

REFERENCES

In Power Line Communications (PLC) data

has been transferred through power lines

using advanced modulation technology.

In 1950 It was used for one way town lightening, relay and remote control.

In mid 1980s there was the beginning of research into the use of the electrical grid to support data transmission in the one way direction.

Broadband over PLC only began at the end of the 1990s.

Broadband over PLC only began at the end of the 1990s.

In 1997 first test for bidirectional data signal transmission over the electrical supply network, by Ascom (Switzerland) and Norweb (U.K.)

In 2000 some tests carried out in France by EDF R&D and Ascom.

Message signal in form of high frequency data (1.6 MHz to 30 MHz) is super imposed over the low frequency signal employed as carrier at low energy levels.

Figure1- Sum of the modulated PLC signal and power signal

Model of power line channel consists of time-varient filter and additive noise .

All impairments can be incorporated into a single filter model.

Transfer function and noise can be estimated through measurements and theoretical analysis.

Where H(f,t) =Hin (f,t).Hchannel (f,t).Hout (f,t)

Output = input (conv) H(f,t)

Figure 2- A simplified model of power line channel

Figure :Distribution network

Figure : Reduced network model

Where A,B,C,D are the coefficients of the F matrix ,V1 ,I1 are the input voltage and input current and V2 ,I2 are the output voltage and output current

And the transfer function can be given as

= propagation constant

Component model is expressed by matrics F

Already existing electrical network is being used.

Quickly deployed with existing technologies.

No additional wiring is required.A robust encryption method is employed.

Two multiple access schemes has been deployed with power line communication-

OFDM This scheme was chosen by the Homeplug committee, all Homeplug standard equipment uses OFDM.

CDMAThe first direct sequence multiple access (DS-CDMA) [3] is being used with low frequencies of power line channel.

BER performance versus Eb/No of the OFDM system when the systembandwidth and carrier number are fixed as 3 MHz and 16 respectively[32]

BER comparison of CDMA system with the power line channel [32]

User specific interleavers are used here for the user separation.

Inherits many advantages from CDMA such as dynamic channel sharing, mitigation of cross- cell interferences, asynchronous transmission, ease of cell planning.

Allows a low complexity multiple user detection techniques applicable to systems with large numbers of users in multipath channels.

2 4 6 8 10 12 14 1610

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idmaPLC,n=8,Eb=15dB,m=512idmaPLC ,n=16,15db,512" " ,n=32,15dB,512n=64

Plot - Results of PLC IDMA at different number of users in same environment conditions

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performance of uncoded IDMA with PLC at different EbNo

plc.EbNo=5dBplc.EbNo=10dBAwgn,EbNo=5dBAwgn,EbNo=10dB

Plot–comparison of PLC with AWGN at the different EbNo

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PLC channelAWGN channel

Plot - Performance of PLC with increasing user count

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uncoded plc,n=20uncoded awgn,n=20coded plc,n=20coded awgn,n=20

Plot - Simulation of IDMA with PLC and IDMA with AWGN with coding and without coding.

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datalen=216datalen=512datalen=1024datalen=2048

Plot - performance of uncoded IDMA systems at no of users=20

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Bit

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data=216data=512data=1024data=2048

Plot - Number of users vs bit error rate plot with different data length

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uncoded,n=10uncoded,n=16uncoded,n=32

Plot - Simulation of power line communication with Uncoded IDMA with QPSK modulation

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Bit

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data216data512data1024

Plot - performance of coded IDMA system

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datalen=512datalen=1024datalen=2048coded,datalen=216

Plot - Simulation of PLC with coded IDMA at different data lengths

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usernum=8,m=216m=512m=1024m=2048

Plot - BER performance of coded IDMA with QPSK at different users at data length=512

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coded,n=10coded,n=16coded, n=32

Plot -Simulation of PLC with Coded IDMA with QPSK ,EbNo=3dB

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m=256m=512m=1024m=2048

Plot - Simulation of PLC with coded IDMA variation of number of usersand data lengths

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n=8,m=256,block=20n=16,m=256,20n=32n=64,m=256n=8,m=512n=16,m=512n=32,m=512n=64,512n=16,m=1024n=32,m=1024n=16,m=2048n=32,m=2048

Plot - Simulation of PLC with uncoded IDMA with tree base interleaver

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BPSKQPSK

Plot - PLC IDMA with tree based interleaver AT m=1024

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with QPSK n=16,m=1024BPSK,n=16,m=1024

Plot- Simulation of PLC with IDMA system having QPSK modulation

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n=8,datalen=512n=16n=32

Plot -Simulation of PLC with IDMA with different users count

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n=16,Eb=10,m=512,BPSKn=16,QPSKn=8,BPSKn=8,QPSKn=8,BPSK,m=1024n=8,QPSK,m=1024n=16,BPSKn=16,QPSK,m=1024

Plot -coded IDMA with TBI, PLC, BPSK & QPSK

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n=16,Eb=10,m=512,BPSK,TBIn=16,QPSK,TBIn=16,BPSK,RI Codedn=16,QPSK,RI

Plot -Performance of TBI,RI with coded IDMA ,PLC,BPSK & QPSK

Plot - Coded IDMA with prime interleaver with different user count.

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n=1,m=512n=8,m=512n=16n=32,eb=12dBn=64Eb=12dB

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Primeinterleaver Random interleaver

Plot -Simulation of comparing prime interleaver with random interleaver

PLC solutions may be seen as complementary or alternative solutions to traditional fixed line networks and wireless networks .

Using IDMA with PLC, one can achieve a system having advantages of both schemes IDMA as well as power line channel.

Using advance modulation multiple access schemes, PLC could be used widely.

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