PDF《DWA Wireless GmbH, Germany》

868 MHz ? No visible degradation of performance C PSSS

250 kbit/s C COBI16+1

235 kbit/s >

10000 Channel, no Rake receivers May

2005 Andreas Wolf, DWA Wireless Slide

14 doc.: IEEE 15-05-0216-04-004b Submission PSD for PSSS 250-400

868 MHz (in

600 KHz channel) Baseband pulse shaping non-linear Real World PA ETSI Limits +/- 40ppm Conforms to ETSI limits dB relative PSD Simulations of the relative PSD in dB for the PSSS 250-400 signal: With precoding, at

400 kchip/s,

250 kbit/s, +/- 40ppm, 50% PA drive, square root raised cosine filter with r = 0.2 May

2005 Andreas Wolf, DWA Wireless Slide

15 doc.: IEEE 15-05-0216-04-004b Submission ? When detecting the current barker code based preamble with FIR filter, the signal coming out of the FIR filter has side slopes limited to +/- 1. ? Advantages: C DC free ? Disadvantages: C Two FIR filters needed, one for preamble detection (13 chip barker code), one for PSSS decoding (31 chip m- sequence). C Not multiple of symbol duration Preamble Detection with current Barker Code LPF........