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IEEE 802.15 <subject>

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Physical Layer Model of the Impact of Bluetooth on IEEE 802.11b Physical Layer Simulation Model For Impact of Bluetooth Interferer on 11Mbps 802.11 Receiver Bluetooth ... – PowerPoint PPT presentation

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Title: IEEE 802.15 <subject>


1
IEEE P802.15 Working Group for Wireless Personal
Area NetworksTM
Physical Layer Model of the Impact of Bluetooth
on IEEE 802.11b
2
Physical Layer Simulation Model ForImpact of
Bluetooth Interferer on 11Mbps 802.11 Receiver
  • Bluetooth interferer modeled as tone jammer
  • Performance of 802.11 Receiver depends on the
    following
  • Signal to Interference Ratio (SIR)
  • Signal to Background Noise Ratio
  • Frequency of Bluetooth Interferer
  • Multipath Structure
  • Receiver Processing

3
Processing Options
  • Basic Processing (BP)
  • BP MF
  • Matched Filter (MF) for collecting multipath
    energy
  • BP MF EQ
  • Equalizer (EQ) to correct for Intersymbol
    Interference (ISI)

4
Tapped Delay Line Channel Model
  • Channel Impulse Response

5
Channel Matched Filter
Channel
Pick Largest
Pick Largest
D-QPSK
D-QPSK
6
Communication System Analysis
7
(No Transcript)
8
Output of Receiver due to 802.11 input
Where
9
Note that if
is time limited to
Seconds,
and the channel is clear, then
and
Which is the cross correlation between the
receivers reference codeword and the particular
codeword being received, times the phase factor
which carries 2 bits. When a multipath channel is
present, the non-zero values of
for
cause intersymbol interference.
10
Response to Interference
Frequency offset,
, has two effects
11
1. Effective amplitude of interferer is
multiplied by
.
2. The discrete sine wave,
, is correlated with
the 64 CCK codewords and contributes to outputs.
12
Simulation Results for three sample
channels.Bluetooth Interferer at 802.11 Band
Center.Eb/No 20 dB for white noise.
13
Effect of frequency offset due todigital sine
wave correlation effect
14
Effect of frequency offset due todigital sine
wave correlation effect
15
Effect of frequency offset due todigital sine
wave correlation effect
16
Conclusions
  • We have modeled the 802.11b Receiver except for
    the Equalizer.
  • Without the equalizer the effect of interference
    is heavily dependent on the actual channel model.
  • At 10-4 the SIR varies from about 6 dB to about
    18 dB

17
Next Steps
  • Add the Equalizer into the model
  • See if the variation due to the channel is
    reduced
  • Develop a formula for the Symbol Error Rate (SER)
    as a function of SIR.
  • Feed that (SER) formula into the MAC model.
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