Evaluating Channel Estimation Sensitivity

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Presentation transcript:

Evaluating Channel Estimation Sensitivity May 2000 doc.: IEEE 802.11-00/xxx September 2000 Evaluating Channel Estimation Sensitivity Steve Halford & Mark Webster Intersil Corporation September, 2000 S. Halford and M. Webster, Intersil M. Webster and K. Halford, Intersil Corp

Purpose Multipath is recognized as major WLAN impairment May 2000 doc.: IEEE 802.11-00/xxx September 2000 Purpose Multipath is recognized as major WLAN impairment Prefer modulations that allow for good multipath performance CCK was selected because of inherent multipath protection Simple Rake receivers possible Superior multipath performance versus complexity Higher rates will require sophisticated multipath protection OFDM was selected because of complexity vs. multipath trades Want to allow for creative solutions Difficult to trade merits due to IP concerns One factor is sensitivity of the equalization & modulation to channel estimation errors Drives bit widths, RF front end specifications, time-lines, etc. Propose a method for exploring the estimation sensitivity S. Halford and M. Webster, Intersil M. Webster and K. Halford, Intersil Corp

Proposed Test for Robustness September 2000 Proposed Test for Robustness Channels cannot be estimated perfectly Noise and finite estimation length contribute Test for sensitivity by perturbing the true channel Receiver uses perturbed channel to estimate equalizer Receiver operates on data from the true channel Calculate the change in PER due to channel estimation error S. Halford and M. Webster, Intersil

Sensitivity to Channel Errors: Block Diagram September 2000 Sensitivity to Channel Errors: Block Diagram Data Data with ISI/Multipath Channel Channel Impulse Response Standard Multipath Performance Test Equalizer Parameter Calculation Receiver Packet Error Rate Equalizer Parameter Packet Error Rate Equalizer Parameter Calculation Receiver Channel Impulse Response Data Data with ISI/Multipath Perturbed Multipath Performance Test with Channel Errors S. Halford and M. Webster, Intersil

Generation of Perturbed Channel September 2000 Generation of Perturbed Channel Number of valid approaches to generating a perturbed channel Suggest the following: where S. Halford and M. Webster, Intersil

Matlab® Code for Exponential Channel with Estimation Errors May 2000 doc.: IEEE 802.11-00/xxx September 2000 Matlab® Code for Exponential Channel with Estimation Errors S. Halford and M. Webster, Intersil M. Webster and K. Halford, Intersil Corp

May 2000 doc.: IEEE 802.11-00/xxx September 2000 Matlab® Code for Exponential Channel with Estimation Errors (continued) S. Halford and M. Webster, Intersil M. Webster and K. Halford, Intersil Corp