User:Ofriedri - Revision history

Ofriedri: /* added link to new transmission time page */

2007-02-22T18:16:26Z

added link to new transmission time page

← Older revision		Revision as of 18:16, 22 February 2007
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	# [https://sarwiki.informatik.hu-berlin.de/wiki/index.php?title=User:Ofriedri&action=edit Edit this page]		# [https://sarwiki.informatik.hu-berlin.de/wiki/index.php?title=User:Ofriedri&action=edit Edit this page]
	# [http://de.wikipedia.org/wiki/Dezibel_%28Umrechnungstabellen%29#dBm_ist_ein_Pegel_mit_Leistungsbezug Conversion table dBm <--> mW (Wikipedia)]		# [http://de.wikipedia.org/wiki/Dezibel_%28Umrechnungstabellen%29#dBm_ist_ein_Pegel_mit_Leistungsbezug Conversion table dBm <--> mW (Wikipedia)]
			# [[Packet transmission time in 802.11]]

Ofriedri: /* Useful links */

2006-08-25T07:48:51Z

Useful links

← Older revision		Revision as of 07:48, 25 August 2006
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	# [http://meta.wikimedia.org/wiki/Help:Editing#The_wiki_markup WikiHelp]		# [http://meta.wikimedia.org/wiki/Help:Editing#The_wiki_markup WikiHelp]
	# [https://sarwiki.informatik.hu-berlin.de/wiki/index.php?title=User:Ofriedri&action=edit Edit this page]		# [https://sarwiki.informatik.hu-berlin.de/wiki/index.php?title=User:Ofriedri&action=edit Edit this page]
			# [http://de.wikipedia.org/wiki/Dezibel_%28Umrechnungstabellen%29#dBm_ist_ein_Pegel_mit_Leistungsbezug Conversion table dBm <--> mW (Wikipedia)]

Ofriedri: /* Adapting the Radio layer */

2006-08-15T14:23:49Z

Adapting the Radio layer

← Older revision		Revision as of 14:23, 15 August 2006
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	\| -62dBm		\| -62dBm
	\|		\|
	{\|border="0" cellspacing="0" cellpadding="0" align="left" style="width:~~100px~~"		{\|border="0" cellspacing="0" cellpadding="0" align="left" style="width:110px"
	\| –82dBm (6Mbps)		\| –82dBm (6Mbps)
	\|-		\|-

Ofriedri: /* Adapting the Radio layer */

2006-08-15T13:25:27Z

Adapting the Radio layer

← Older revision		Revision as of 13:25, 15 August 2006
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	\| 802.11a		\| 802.11a
	\| -62dBm		\| -62dBm
			\|
	\| -82dBm to -65dBm
			{\|border="0" cellspacing="0" cellpadding="0" align="left" style="width:100px"
			\| –82dBm (6Mbps)
			\|-
			\| –81dBm (9Mbps)
			\|-
			\| –79dBm (12Mbps)
			\|-
			\| –77dBm (18Mbps)
			\|-
			\| –74dBm (24Mbps)
			\|-
			\| –70dBm (36Mbps)
			\|-
			\| –66dBm (48Mbps)
			\|-
			\| –65dBm (54Mbps)
			\|}
	\| rate dependent		\| rate dependent
	\|		\|
	'''17.3.10.5 CCA sensitivity'''		'''17.3.10.5 CCA sensitivity'''

	The start of a valid OFDM transmission at a receive level equal to or greater than the minimum 6 Mbit/s sensitivity (-82 dBm) shall cause CCA to indicate busy with a probability >90% within 4 μs. If the preamble portion was missed, the receiver shall hold the carrier sense (CS) signal busy for any signal 20 dB above the minimum 6 Mbit/s sensitivity (-62 dBm). ~~(see Table 91 below)~~		The start of a valid OFDM transmission at a receive level equal to or greater than the minimum 6 Mbit/s sensitivity (-82 dBm) shall cause CCA to indicate busy with a probability >90% within 4 μs. If the preamble portion was missed, the receiver shall hold the carrier sense (CS) signal busy for any signal 20 dB above the minimum 6 Mbit/s sensitivity (-62 dBm).
	\|-		\|-
	\| 802.11b		\| 802.11b
Line 203:		Line 220:
	\|}		\|}

			<!--
	{\| border="1" cellspacing="0" cellpadding="5" align="center"		{\| border="1" cellspacing="0" cellpadding="5" align="center"
	\| '''OFDM''' Sensitivity values (802.11a-1999.pdf)		\| '''OFDM''' Sensitivity values (802.11a-1999.pdf)
	\| [[Image:OFDM Sensitivity sm.JPG]]		\| [[Image:OFDM Sensitivity sm.JPG]]
	\|}		\|}
			-->

	=== Implementation of bit-rate selection algorithms ===		=== Implementation of bit-rate selection algorithms ===

Ofriedri: /* Adapting the Radio layer */

2006-08-15T12:45:33Z

Adapting the Radio layer

← Older revision		Revision as of 12:45, 15 August 2006
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	'''15.4.8.1 Receiver minimum input level sensitivity'''		'''15.4.8.1 Receiver minimum input level sensitivity'''

	The frame error ratio (FER) shall be less than 8x10–2 at an MPDU length of 1024 bytes for an input level of		The frame error ratio (FER) shall be less than 8x10–2 at an MPDU length of 1024 bytes for an input level of –80 dBm measured at the antenna connector. This FER shall be specified for 2 Mbit/s DQPSK modulation. The test for the minimum input level sensitivity shall be conducted with the energy detection threshold set <= –80 dBm.
	–80 dBm measured at the antenna connector. This FER shall be specified for 2 Mbit/s DQPSK modulation.
	The test for the minimum input level sensitivity shall be conducted with the energy detection threshold set
	<= –80 dBm.

	'''15.4.8.4 CCA'''		'''15.4.8.4 CCA'''

	The DSSS PHY shall provide the capability to perform CCA according to at least one of the following three methods:		The DSSS PHY shall provide the capability to perform CCA according to at least one of the following three methods:

	— CCA Mode 1: Energy above threshold. CCA shall report a busy medium upon detection of any energy above the ED threshold.		— CCA Mode 1: Energy above threshold. CCA shall report a busy medium upon detection of any energy above the ED threshold.

	— CCA Mode 2: Carrier sense only. CCA shall report a busy medium only upon detection of a DSSS signal. This signal may be above or below the ED threshold.		— CCA Mode 2: Carrier sense only. CCA shall report a busy medium only upon detection of a DSSS signal. This signal may be above or below the ED threshold.

	— CCA Mode 3: Carrier sense with energy above threshold. CCA shall report a busy medium upon detection of a DSSS signal with energy above the ED threshold.		— CCA Mode 3: Carrier sense with energy above threshold. CCA shall report a busy medium upon detection of a DSSS signal with energy above the ED threshold.
	\|-		\|-

Ofriedri: New table with sensitivity values

2006-08-15T12:43:41Z

New table with sensitivity values

@@ Line 125: / Line 125: @@
 ==== Adapting the Radio layer ====
 *adapt the Radio layer to support different sensitivity values (dB) according to the PHY layer
 *Try to keep logic in MAC layer so that there will be a central management of the MAC/PHY layer and the corresponding values. Sensitivity values in the Radio layer are all dependent on the MAC/PHY layer chosen, so it makes sense to implement that kind of logic.
@@ Line 131: / Line 130: @@
 {| border="1" cellspacing="0" cellpadding="5" align="center"
+|
 |-
  | '''OFDM''' Sensitivity values (802.11a-1999.pdf)
  | [[Image:OFDM Sensitivity sm.JPG]]
 |}
 === Implementation of bit-rate selection algorithms ===

Ofriedri: /* Adapting the Radio layer */

2006-08-07T09:55:03Z

Adapting the Radio layer

← Older revision		Revision as of 09:55, 7 August 2006
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	\| [[Image:OFDM Sensitivity sm.JPG]]		\| [[Image:OFDM Sensitivity sm.JPG]]
	\|}		\|}


			"A noise figure (NF) of 10 dB and an implementation loss of 5 dB are
			assumed." (???)

	=== Implementation of bit-rate selection algorithms ===		=== Implementation of bit-rate selection algorithms ===

Ofriedri: /* Adapting the Radio layer */

2006-08-07T09:32:00Z

Adapting the Radio layer

← Older revision		Revision as of 09:32, 7 August 2006
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	{\| border="1" cellspacing="0" cellpadding="5" align="center"		{\| border="1" cellspacing="0" cellpadding="5" align="center"
	\|DSSS Sensitivity Values (802.11-1999.pdf, 15.4.8.4):		\|'''DSSS''' Sensitivity Values (802.11-1999.pdf, 15.4.8.4)
	\|		\|
	{\| border="1" cellspacing="0" cellpadding="5" align="left"		{\| border="1" cellspacing="0" cellpadding="5" align="left"
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	\| 802.11b: 18.4.8.4		\| 802.11b: 18.4.8.4
	\|}		\|}
			\|-
		⚫	\| '''OFDM''' Sensitivity values (802.11a-1999.pdf)
			\| [[Image:OFDM Sensitivity sm.JPG]]
	\|}		\|}

⚫	OFDM Sensitivity values (802.11a-1999.pdf)~~: [[Image:OFDM Sensitivity sm.JPG]]~~

	=== Implementation of bit-rate selection algorithms ===		=== Implementation of bit-rate selection algorithms ===

Ofriedri: /* Adapting the Radio layer */

2006-08-07T09:08:44Z

Adapting the Radio layer

← Older revision		Revision as of 09:08, 7 August 2006
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	*In the Radio layer there could be methods '''<code>setSensitivityXY(int sensitivityValue);</code>''' and '''<code>getSensitivityXY();</code>''' to realize this approach.		*In the Radio layer there could be methods '''<code>setSensitivityXY(int sensitivityValue);</code>''' and '''<code>getSensitivityXY();</code>''' to realize this approach.


	{\| border="2" cellspacing="0" cellpadding="5" align="~~left~~"		{\| border="1" cellspacing="0" cellpadding="5" align="center"
	\|DSSS Sensitivity Values (802.11-1999.pdf, 15.4.8.4):		\|DSSS Sensitivity Values (802.11-1999.pdf, 15.4.8.4):
	\|		\|
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	\| 802.11b: 18.4.8.4		\| 802.11b: 18.4.8.4
	\|}		\|}
	\|}h		\|}


	OFDM Sensitivity values (802.11a-1999.pdf): [[Image:OFDM Sensitivity sm.JPG]]		OFDM Sensitivity values (802.11a-1999.pdf): [[Image:OFDM Sensitivity sm.JPG]]

Ofriedri at 09:06, 7 August 2006

2006-08-07T09:06:22Z

← Older revision		Revision as of 09:06, 7 August 2006
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	\|		\|
	\|}		\|}



	==== Adapting the Radio layer ====		==== Adapting the Radio layer ====
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	*In the Radio layer there could be methods '''<code>setSensitivityXY(int sensitivityValue);</code>''' and '''<code>getSensitivityXY();</code>''' to realize this approach.		*In the Radio layer there could be methods '''<code>setSensitivityXY(int sensitivityValue);</code>''' and '''<code>getSensitivityXY();</code>''' to realize this approach.

	{\| border="0" cellspacing="0" cellpadding="5" align="left"		{\| border="2" cellspacing="0" cellpadding="5" align="left"
	\|DSSS Sensitivity Values (802.11-1999.pdf, 15.4.8.4):		\|DSSS Sensitivity Values (802.11-1999.pdf, 15.4.8.4):
	\|		\|
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	\| -70 dBm		\| -70 dBm
	\| 802.11b: 18.4.8.4		\| 802.11b: 18.4.8.4
	\|-
	\|}		\|}
	\|-

	\|}h		\|}h