Changes between Version 2 and Version 3 of 802.11/PHY

Timestamp:

Jul 28, 2013, 9:59:55 PM (11 years ago)

Author:

murphpo

Comment:

--

802.11/PHY

@@ -32 +32 @@
 ||  64-QAM  ||  3/4  ||  54  ||
 
-The PHY receiver also implements the 1Mbps DSSS rate specified in the original 802.11 standard (section 16.2 of the 802.11-2012 standard). This receiver allows reception of management frames transmitted by 802.11 devices at 1Mbps. These transmissions are common in deployments of 802.11 hardware at 2.4GHz. For example, Beacon and Probe Request frames are frequently transmitted at 1Mbps by commercial devices. The basic STA/AP association handshake requires reception of these frames.
-
-The current WARP 802.11 ref design does not implement a DSSS transmitter, as 802.11 devices are able to receive management frames at higher rates (including 6Mbps, the lowest OFDM rate, which is commonly used for management frames at 5GHz).
+'''DSSS:''' The PHY receiver also implements the 1Mbps DSSS rate specified in the original 802.11 standard (section 16.2 of the 802.11-2012 standard). This receiver allows reception of management frames transmitted by 802.11 devices at 1Mbps. These transmissions are common in deployments of 802.11 hardware at 2.4GHz. For example, Beacon and Probe Request frames are frequently transmitted at 1Mbps by commercial devices. The basic STA/AP association handshake requires reception of these frames. The 802.11 Reference Design does not implement a DSSS transmitter, as 802.11 devices are able to receive management frames at higher rates (including 6Mbps, the lowest OFDM rate, which is commonly used for management frames at 5GHz).
 
 '''Synchronization:''' Our PHY implementation requires no "cheating"- all synchronization is implemented in the FPGA and operates per-packet in real-time.
@@ -42 +40 @@
  * The channel estimation block computes a complex channel estimate (magnitude and phase) for each subcarrier per-packet. The equalizer applies the channel estimate per-subcarrier. The current Rx PHY uses the same channel estimates for the full packet. Extending this to a decision feedback scheme (where channel estimates are updated intra-packet) would be a straightforward extension. 
 
-'''Multi-antenna support:''' The current PHY Tx/Rx pipelines are SISO, supporting only the modulation/coding rates specified in section 18 of the standard.
+'''Multi-antenna support:''' The current PHY Tx/Rx pipelines are SISO, supporting only the modulation/coding rates specified in section 18 of the standard. We will add selecting diversity using the WARP v3 RF B interface soon. We're also considering implementing some of the MIMO modes from 802.11n. Let us know if these would be especially useful for your research.