| | 1 | == [wiki:OFDM/MIMO MIMO OFDM] | [wiki:OFDM/MIMO#Documentation Documentation] | OFDM Frame Format == |
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| | 3 | The frame format for the WARP MIMO OFDM core is based loosly on the frame format specified in the [http://ieeexplore.ieee.org/xpl/standardstoc.jsp?isnumber=17645&isYear=1999 IEEE 802.11a] wireless networking standard. |
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| | 5 | Each frame is divided into four sections, illustrated below: |
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| | 7 | [[Image(OFDM/MIMO/Docs/Images:FrameFormatOverview.png)]] |
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| | 9 | *Preamble: a hard-coded 320-sample sequence used by the receiver for AGC, carrier frequency offset estimation and symbol timing estimation |
| | 10 | *Training: hard-coded OFDM symbols used for channel estimation. The number of training symbol periods is programmable per-packet. |
| | 11 | *Base Rate: a programmable number of OFDM symbols containing a packet's header, modulated using the user-specified base-rate modulation scheme. |
| | 12 | *Full Rate: a programmable number of OFDM symbols containing a packet's payload, modulated using the user-specified full-rate modulation scheme. |
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| | 14 | The WARP MIMO OFDM core supports both single (SISO) and two antenna (MIMO) modes. The frame formats for these two modes are detailed below. |
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| | 16 | == SISO Frame Format == |
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| | 18 | [[Image(OFDM/MIMO/Docs/Images:SISO_Frame_Format.png)]] |
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| | 20 | == MIMO Frame Format == |
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| | 22 | [[Image(OFDM/MIMO/Docs/Images:MIMO_Frame_Format.png)]] |
