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Investigation of upsampling techniques for TGac Channel Model

Investigation of upsampling techniques for TGac Channel Model. Authors:. Date: 2009-05-11. Introduction. Approach is to reuse the TGn Channel model with minor modifications [1-4] Allows known channel model to be used

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Investigation of upsampling techniques for TGac Channel Model

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  1. Investigation of upsampling techniques for TGac Channel Model Authors: Date: 2009-05-11 Eldad Perahia, Intel Corporation

  2. Introduction • Approach is to reuse the TGn Channel model with minor modifications [1-4] • Allows known channel model to be used • Allows a large collection of .l1n results to be compared to TGac techniques • Target: When simulating a .11n system, the chosen up-sampling technique should not alter the performance • In contiguously 10ns sampled cluster channel taps (channel B), linearly interpolation of the cluster channel tap power was simulated. • For channels with sparse sampling (channel D, E were simulated), several interpolation methods of the cluster channel tap power were investigated Eldad Perahia, Intel Corporation

  3. Interpolation Methods • For channel model B a linearly interpolation method was used. • Each Cluster channel tap power was linearly interpolated to provide a effective channel tap spacing of 5ns. • Channel model D and E were interpolated with several techniques • In all cases the first contiguous 10ns sample cluster was linearly interpolated as in the channel B case. • The sparse taps were then interpolated with different approaches • The target was to find an interpolation method that afforded the best match to a .11n system using the TGn model Eldad Perahia, Intel Corporation

  4. Interpolation Approaches (Channel Model D example) Case 1 • Initial set of contiguous 10ns cluster channel tap power samples linearly interpolated • Remaining sparse taps used as is (assumed to be perfect reflectors) Case 2 • Initial set of contiguous 10ns cluster channel tap power samples linearly interpolated • Remaining sparse taps linearly interpolated with a new sample place in the middle (in time) of the TGn samples Eldad Perahia, Intel Corporation

  5. Interpolation Approaches (Channel Model D example) Cont. Case 3 • Initial set of contiguous 10ns cluster channel tap power samples linearly interpolated • Remaining sparse taps linearly interpolated with new samples placed every 5ns between TGn samples Case 4 • Initial set of contiguous 10ns cluster channel tap power samples linearly interpolated • Remaining sparse taps linearly interpolated with a new sample place 5ns after a TGn sample Eldad Perahia, Intel Corporation

  6. 802.11n 1x1 1-Spatial Stream, TGn Channel model B (100 MHz), Linearly Interpolated (200MHz), 1000 Byte Packet, CC67, 20MHz, MCS 0 and MCS 7 Eldad Perahia, Intel Corporation

  7. 802.11n 2x4 2-Spatial Streams, TGn Channel model B (100 MHz), Linearly Interpolated (200MHz), 1000 Byte Packet, CC67, 20MHz, MCS 8 and MCS 15 Eldad Perahia, Intel Corporation

  8. 802.11n 4x6 4-Spatial Streams, TGn Channel model B (100 MHz), Linearly Interpolated (200MHz), 1000 Byte Packet, CC67, 20MHz, MCS 24 and MCS 31 Eldad Perahia, Intel Corporation

  9. 802.11n 2x4 2-Spatial Streams, TGn Channel model D (100 MHz), Case 1-4 Interpolated (200MHz), 1000 Byte Packet, CC67, 20MHz, MCS 15 Eldad Perahia, Intel Corporation

  10. 802.11n 2x4 2-Spatial Streams, TGn Channel model D (100 MHz), Case 1-4 Interpolated (200MHz), 1000 Byte Packet, CC67, 40MHz, MCS 15 Eldad Perahia, Intel Corporation

  11. 802.11n 4x6 4-Spatial Streams, TGn Channel model D (100 MHz), Case 1-4 Interpolated (200MHz), 1000 Byte Packet, CC67, 20MHz, MCS 31 Eldad Perahia, Intel Corporation

  12. 802.11n 4x6 4-Spatial Streams, TGn Channel model D (100 MHz), Case 1-4 Interpolated (200MHz), 1000 Byte Packet, CC67, 40MHz, MCS 31 Eldad Perahia, Intel Corporation

  13. 802.11n 2x4 2-Spatial Streams, TGn Channel model E (100 MHz), Case 1-4 Interpolated (200MHz), 1000 Byte Packet, CC67, 20MHz, MCS 15 Eldad Perahia, Intel Corporation

  14. 802.11n 2x4 2-Spatial Streams, TGn Channel model E (100 MHz), Case 1-4 Interpolated (200MHz), 1000 Byte Packet, CC67, 40MHz, MCS 15 Eldad Perahia, Intel Corporation

  15. 802.11n 4x6 4-Spatial Streams, TGn Channel model E (100 MHz), Case 1-4 Interpolated (200MHz), 1000 Byte Packet, CC67, 20MHz, MCS 31 Eldad Perahia, Intel Corporation

  16. 802.11n 4x6 4-Spatial Streams, TGn Channel model E (100 MHz), Case 1-4 Interpolated (200MHz), 1000 Byte Packet, CC67, 40MHz, MCS 31 Eldad Perahia, Intel Corporation

  17. Conclusion • Linearly interpolating the cluster channel tap power at 5ns for TGn channel model B provided negligible performance difference for an .11n system • Four interpolation techniques were investigated for TGn Channel model D and E • Case 2 and Case 4 resulted with a close match to .11n TGn performance • It is recommended that the approach of Case 4 be used as the method of interpolation in TGac • Provides same performance as the TGn model when simulating a .11n system • Felt to be a more intuitive channel for a higher sampling rate Eldad Perahia, Intel Corporation

  18. References • Breit, G., Sampath, H.,et al., TGac Channel Model Addendum, IEEE 802.11-09/0308r1, Mar 9, 2009 • Breit, G., Sampath, H.,et al., Evaluation of AoD for TGac Multi-User MIMO channel Model, IEEE 802.11-09/0307r1, Mar 9, 2009 • Kenney, T., Perahia, E., Reuse of TGn Channel Model for SDMA in TGac, IEEE 802.11-09/0179r0, Jan 22, 2009 • Breit, G., Sampath, H.,et al., 802.11ac Channel Modeling, IEEE 802.11-09/0088r1, Jan 19, 2009 Eldad Perahia, Intel Corporation

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