An Update on Wireless Standards Activity - High Frequency Electronics
(FHSS). 802.15.4 allows for data rates two to four times higher than Zigbee's 128 kbps. The IEEE WPAN standard establishes a means for short-range wireless ...
his report offers a brief summary of some recent activities in wireless system standards. The standards process is continuous—even established standards are updated and modified in response to changes in technology and marketplace. It is impossible to collect comprehensive data on all standards. This update is just a snapshot of a few standards we think are of current interest to our readers.
IEEE 802.15.4 WPAN Standard IEEE 802.15.4 is the IEEE standard, covering Wireless Personal Area Networks (WPAN), which was approved and published in late 2003. It defines a physical layer (PHY) and media access controller (MAC) for applications in home networking, automotive networks, industrial networks, interactive toys and remote metering. The standard provides for data rates of 250 kbps, 40 kbps and 20 kbps in a star or peer-to-peer configuration. It has dynamic device addressing and a fully handshaked protocol for transfer reliability. Frequency bands are 16 channels in the 2.4 GHz ISM band, 10 channels in the 915 MHz ISM band and one channel in the European 868 MHz band. Key attributes of 802.15.4 include: 2.4 GHz PHY • 250 kbps (4 bits/symbol, 62.5 ksymbols/s) • Data modulation is 16-ary orthogonal modulation • 16 symbols are orthogonal set of 32-chip PN codes • Chip modulation is O-QPSK at 2.0 Mchips/s 868 MHz/915 MHz PHY • Symbol Rate 868 MHz Band: 20 kbps (1 bit/symbol, 20 ksymbols/s) 915 MHz Band: 40 kbps (1 bit/symbol, 40 ksymbols/s) • Data modulation is BPSK with differential encoding • Spreading code: a 15-chip m-sequence • Chip modulation is BPSK: 868 MHz Band: 300 kchips/s 36
High Frequency Electronics
915 MHz Band: 600 kchips/s • Transmit Power: at least 0.5 mW • Transmit Center Frequency Tolerance: ± 40 ppm • Receiver Sensitivity (Packet Error Rate
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