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Performance Analysis of CCK Modulation in a Multi-Path Channel

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Performance Analysis of CCK Modulation in a Multi-Path Channel SURE Program Research Summary Paul Yang, University of California at Berkeley Advisor: Professor Daniel ... – PowerPoint PPT presentation

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Title: Performance Analysis of CCK Modulation in a Multi-Path Channel


1
Performance Analysis of CCK Modulation in a
Multi-Path Channel
SURE Program Research Summary
  • Paul Yang, University of California at Berkeley
  • Advisor Professor Daniel Noneaker

2
Overview
  • Motivation
  • Background information
  • Analysis in a single-path channel
  • Analysis in a multi-path channel
  • Conclusion

3
Motivation
  • Desire for high data access rate.
  • Proposed solutions.
  • Standards IEEE 802.11b, Bluetooth.

4
Background Information
  • CCK Complementary Code Keying
  • CCK is the modulation scheme used for IEEE
    802.11b
  • Multi-path causes degradation
  • Goal Find Performance of CCK Modulation in a
    multi-path channel

5
Single-Path AWGN Channel
  • CCK is a 256-ary modulation scheme gt 256
    distinct signals
  • Coherent Correlation Detector 256 correlators
  • Noise modeled by random variables (N0 ,, Nn-1)
  • AWGN Additive White Gaussian Noise

6
Performance in a Single-Path Channel
Analytical Upper bound blue Analytical Lower
bound green Simulation Results red
7
Multi-Path Propagation
  • Example of a multi-path channel

Picture obtained from International Engineering
Consortium http//www.iec.org/online/tutorials
8
Multi-Path Channel
  • Two paths from transmitter to detector
  • Alpha ratio strength of direct channel relative
    to indirect channel.
  • SNR sum of signal-to-noise ratios in both paths

9
Simulation Results Low alpha ratio
  • Low alpha ratio high error probability
  • Strong Indirect Signal gt Delay matters
  • Worst case delay 3

10
Results of Simulation in a Multi-path Channel
High alpha ratio
High alpha ratio low error probability Weak
Indirect Signal gt Delay does not matter
11
Simulation Results
  • Error probability decreases with increasing alpha
    ratio
  • Desired error probability 10(-2) gt achieved
    at alpha ratio of 2.5

12
Conclusions
  • CCK performed well in single-path channel
  • CCK did not perform as well in multi-path channel
    with this detector
  • Future work
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