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Adjacent/Nonadjacent Channel Rejection

Adjacent/Nonadjacent Channel Rejection. Date: 2011-01-17. Authors:. Introduction. 11n specified adjacent and nonadjacent channel rejection requirements for 20 and 40 MHz channels and up to 64-QAM 5/6 This presentation extends the adjacent and nonadjacent channel rejection requirements to

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Adjacent/Nonadjacent Channel Rejection

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  1. Adjacent/Nonadjacent Channel Rejection Date: 2011-01-17 Authors: Youhan Kim et al.

  2. Introduction • 11n specified adjacent and nonadjacent channel rejection requirements for 20 and 40 MHz channels and up to 64-QAM 5/6 • This presentation extends the adjacent and nonadjacent channel rejection requirements to • 80, 160 and 80+80 MHz channels • 256-QAM 3/4 and 5/6 Youhan Kim et al.

  3. 80 MHz and 160 MHz • Recap: 11n 20/40 MHz definitions • Desired signal strength = 3 dB above RX sensitivity • Interfering signal placed W MHz away from the center frequency of the desired signal • Adjacent channel rejection • W = bandwidth of the desired signal (20 or 40 MHz) • Nonadjacent channel rejection • W ≥ 2 * bandwidth of the desired signal • Raise power of interfering signal until 10% PER reached • BW of interference not explicitly specified, but implicitly clear • Adjacent interference placed 20 MHz away for 20 MHz channels • If interferer is 40 MHz wide, then overlaps with desired signal • Nonadjacent interference placed 40 MHz away for 40 MHz channels • If interferer is 20 MHz wide, then 10 MHz gap between desired signal and interferer • Suggest to explicitly specify BW of interferer in 11ac • BW of interferer = BW of desired signal • Propose to extend the above 11n definitions to 80 and 160 MHz for 11ac • W = 20, 40, 80 or 160 MHz Youhan Kim et al.

  4. 80+80 MHz (1/2) • 80+80 MHz is simply 160 MHz split into two segments • Reasonable to expect similar adjacent/nonadjacent channel rejection performance between 80+80 MHz and 160 MHz • But sometimes unclear on where to place a 160 MHz interference next to an 80 MHz segment • Artifact of non-overlapping channelization 160 MHz Interference 160 MHz 160 MHz 160 MHz Interference 80+80 MHz 80 MHz 80 MHz Youhan Kim et al.

  5. 80+80 MHz (2/2) • Easier to put an 80 MHz interference next to an 80 MHz segment • But an 80 MHz interference has 3 dB higher PSD than a 160 MHz interference with the same total power • Suggest to use an 80 MHz interference with 3 dB less adjacent/nonadjacent channel rejection requirement (specified in total power) than 160 MHz • PSD of interference remains identical to a 160 MHz interference Same total power 80 MHz Interference 3 dB 160 MHz Interference 80 MHz 80 MHz Desired signal (80+80 MHz) Youhan Kim et al.

  6. Adjacent/Nonadjacent Channel Rejection Test • Desired signal strength = 3 dB above RX sensitivity • If desired signal BW = 20/40/80/160 MHz • Interfering signal (same BW as the desired signal) placed W MHz away from the center frequency of the desired signal • Adjacent channel rejection : W = BW of the desired signal • Nonadjacent channel rejection : W ≥ 2 * BW of the desired signal • If desired signal BW = 80+80 MHz • An interfering signal of 80 MHz BW placed W MHz away from the center frequency of one of the desired signal frequency segments • Adjacent channel rejection : W = 80 MHz • Nonadjacent channel rejection : W ≥ 160 MHz • Raise power of interfering signal until 10% PER reached Youhan Kim et al.

  7. Rejection Levels for 256-QAM • Adj./nonadj. channel rejection levels = functions of RX sensitivity • Based on the RX sensitivity for 256-QAM proposed in [1] Youhan Kim et al.

  8. Pre-Motion • Do you support adjacent/nonadjacent channel rejection for 11ac as shown on slides 6 and 7, and editing the specification framework document (11-09/0992) accordingly? Youhan Kim et al.

  9. References [1] Kim, Y. et al., 256-QAM TX EVM and RX Sensitivity, IEEE 802.11-11/0029r0, Jan. 2011 Youhan Kim et al.

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