Technical complexity related to meeting the RF mask January 2006 doc.: IEEE 802.22-06/0006r0 January 2009 Technical complexity related to meeting the RF mask Author: Abstract This contribution summarizes graphically the technical trade-offs required to meet the RF mask specified by the FCC R&O 08-260 Notice: This document has been prepared to assist IEEE 802.22. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.11. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures <http://standards.ieee.org/guides/bylaws/sb-bylaws.pdf>, including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair Carl R. Stevenson <wk3c@wk3c.com> as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE 802.11 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at <patcom@ieee.org>. Gerald Chouinard, CRC Gerald Chouinard, CRC

January 2009 RF mask as specified in the FCC R&O (i.e., relative the in-channel PSD in 100 kHz) Gerald Chouinard, CRC

January 2009 RF mask as specified in the FCC R&O (i.e., relative the in-channel PSD in 100 kHz) Gerald Chouinard, CRC

January 2009 RF mask as specified in the FCC R&O (i.e., relative the in-channel PSD in 100 kHz) Gerald Chouinard, CRC

RF mask to be specified relative to the total power in the TV channel January 2009 RF mask to be specified relative to the total power in the TV channel Gerald Chouinard, CRC

RF output signal from the 802.22 WRAN 2k FFT January 2009 RF output signal from the 802.22 WRAN 2k FFT Gerald Chouinard, CRC

Eighth Order Butterworth LPF January 2009 Eighth Order Butterworth LPF 3 MHz Oversampling by 8x Gerald Chouinard, CRC

January 2009 PSD of PA Input Signal Gerald Chouinard, CRC

January 2006 doc.: IEEE 802.22-06/0006r0 January 2009 Non-Linear PA Model The nonlinearity of the power amplifier (PA) distorts the OFDM spectrum In this document the 802.11 nonlinear PA model is used This model was used in the evaluation of 802.11n proposals [3] and was originally used in modeling 802.11b [4]. This same form of non-linearity is specified in the 802.22 channel models document [2] Gerald Chouinard, CRC Gerald Chouinard, CRC

Non-Linear PA Model Asat January 2009 January 2006 doc.: IEEE 802.22-06/0006r0 January 2009 Non-Linear PA Model Asat Gerald Chouinard, CRC Gerald Chouinard, CRC

PSD of PA Input and PA Output for three values of PA Back-off January 2009 PSD of PA Input and PA Output for three values of PA Back-off Gerald Chouinard, CRC

Rapp-6 model versus perfect clipper at RF January 2009 Rapp-6 model versus perfect clipper at RF Gerald Chouinard, CRC

RF output signal from the 802.22 WRAN 2k FFT January 2009 RF output signal from the 802.22 WRAN 2k FFT Gerald Chouinard, CRC

RF output signal for 256 tap FIR filter January 2009 RF output signal for 256 tap FIR filter Gerald Chouinard, CRC

January 2009 RF output signal for 256 tap FIR filter and 8.6 dB back-off to meet the 68.5 dB rejection at 9 MHz for the second adjacent channel (Part 15.209a level for 4 W EIRP) Gerald Chouinard, CRC

January 2009 RF output signal for 256 tap FIR filter and 9.2 dB back-off to meet the 55 dB rejection at 3 MHz for the first adjacent channel Gerald Chouinard, CRC

January 2006 doc.: IEEE 802.22-06/0006r0 January 2009 References IEEE P802.22™/ DRAFTv1.0 Draft Standard for Wireless Regional Area Networks Part 22: Cognitive Wireless RAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: Policies and procedures for operation in the TV Bands, April 2008 Mark Webster, Suggested PA Model for 802.11 HRb, IEEE 802.11-00/294r0, September 2000 FCC R&O 08-260 Gerald Chouinard, CRC Gerald Chouinard, CRC