Sidebar: UWB Standards Face Off

Multiband OFDM

The Multiband OFDM Alliance's specification gets its name from the fact that it divides UWB's 7,500-MHz-wide frequency range between 3.1 GHz and 10.6 GHz into smaller, 528-MHz segments. A mandatory mode supported by all MBOA devices uses three bands below 5 GHz.

Orthogonal Frequency Division Multiplexing transmits data in 312.5 nanosecond time slots, alternating among three frequency bands. Spreading information across multiple bands allows the technology to be very efficient, offering high bandwidth at low power levels, according to Srinivasa Somayazulu, a senior staff researcher at Intel.


The UWB Forum's DS-UWB technology transmits data at a rate exceeding 1 billion pulses per second and spreads the transmissions across the widest possible frequency band. Forum members are also promoting acceptance of what's called the Common Signal Mode, which works as a kind of traffic cop among the different UWB standards, says Freescale's Martin Rofheart.

Copyright © 2004 IDG Communications, Inc.

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