Submission Title: [OQPSK proposal for Chinese band] July 2007 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [OQPSK proposal for Chinese band] Date Submitted: [19−July−2007] Source: [Michael Schmidt, Frank Poegel], Company: [Atmel] Address: [Koenigsbruecker Str. 61, 01099 Dresden, Germany] Voice:[+49 351 6523 436, +49 351 6523 428], FAX: [+49 351 6523 5436, +49 351 6523 5428] E−Mail: [michael.schmidt@hno.atmel.com, frank.poegel@hno.atmel.com] Re: [802.15.4c] Abstract: [Discussion of filtering options for OQPSK to fulfill Chinese PSD requirements] Purpose: [To encourage discussion in 802.15.4c] Notice: This document has been prepared to assist the IEEE P802.15. 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 acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15. Michael Schmidt and Frank Poegel (Atmel)

PHY proposal for 779…787MHz band July 2007 PHY proposal for 779…787MHz band The preferred choice is OQPSK modulation since it is easy to implement and is already part of the IEEE 802.15.4 PHY Chinese regulatory rules (see doc. IEEE 15-07-0675-01-004c) specify a limit of -36 dBm (100 kHz RBW, RMS detector) at non specified distance from carrier Targeting reduced side lobes implies that half-sine shaping might not be appropriate. Options for pulse shaping: Raised cosine (RC) shaping with roll-off factor R (OQPSK-RC-R) Half-sine shaping + raised cosine shaping with roll-off factor R (OQPSK-SIN-RC-R) Michael Schmidt and Frank Poegel (Atmel)

OQPSK proposal for 779…787MHz band July 2007 OQPSK proposal for 779…787MHz band Power spectra: Ideal shaping filter Random chip sequence 100 kHz resolution band width 0 dBm TX-power Michael Schmidt and Frank Poegel (Atmel)

OQPSK proposal for 779…787MHz band, cont’d July 2007 OQPSK proposal for 779…787MHz band, cont’d Constellation chart (RC-pulse shaping): Michael Schmidt and Frank Poegel (Atmel)

OQPSK proposal for 779…787MHz band, cont’d July 2007 OQPSK proposal for 779…787MHz band, cont’d Constellation chart (SIN-RC-pulse shaping): Michael Schmidt and Frank Poegel (Atmel)

OQPSK proposal for 779…787MHz band, cont’d July 2007 OQPSK proposal for 779…787MHz band, cont’d EVM [%] Crest factor [dB] OQPSK-SIN OQPSK-RC-0.5 0 (Nyquist) 1.0 OQPSK-RC-0.8 OQPSK-RC-1.0 1.25 OQPSK-SIN-RC-0.2 28 1.6 OQPSK-SIN-RC-0.5 30 1.1 OQPSK-SIN-RC-0.8 33 0.9 OQPSK-SIN-RC-1.0 35 0.6 Michael Schmidt and Frank Poegel (Atmel)

OQPSK proposal for 779…787MHz band, summary July 2007 OQPSK proposal for 779…787MHz band, summary Regulatory rules for China may require reduced side lobes: -36 dBm @ non specified distance from carrier SIN-RC shaping is not recommended w.r.t. EVM < 35% RC-filtering reduces side lobes but increases the crest factor Roll-off factor should be close to 1 in order to simplify a discrete time implementation Robust non-coherent detection of OQPSK-RC can be achieved with well-known differential MSK-type detectors with no loss in performance, i.e. performance is similar to OQPSK mode @ 900 MHz Michael Schmidt and Frank Poegel (Atmel)