The scope of this document is to define the physical layer, orlayer 1, of the IOTA/OFDM Modulation (IOTA) wideband air interface.The wideband air interface called Uw is the interface between thefixed network equipment (FNE) and the subscriber units or directlybetween subscriber units in a wideband system. The function oflayer 1 is to convey information through the radio frequencychannel, while contending with various channel impairments such asnoise, interference, radio multipath, and delay distortion. Thedefinition of layer 1 concentrates on the following subjects:
• Modulation
• Pulsed transmission turn-on and turn-off
• Mechanism for time division multiplexing (TDM)synchronization
• Definition of TDMA frame structure
• Mechanism for amplitude and phase recovery
• Radio channel coding
IOTA has been designed to deliver a flexible bit rate in 50,100, and 150 kHz radio channel bandwidths in the 700 MHz band. Thisflexibility allows IOTA to optimize performance by allowing highersystem data throughput under good signal conditions while stillsupplying significantly better throughput than current systemsunder weaker signal conditions. The basic mode of operation forIOTA is time division multiple-access (TDMA). Layer 1 reservescertain symbols within the information stream to provide for itsoperation. Many special terms used in this document are defined inSection 2.
- Edition:
- 03
- Published:
- 03/01/2003
- Number of Pages:
- 46
- File Size:
- 1 file , 900 KB
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