From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alex Hacker Date: Fri, 29 Mar 2013 11:23:40 +0600 Subject: [ath9k-devel] Fixing the rate and rate relationship to OFDM In-Reply-To: References: <800E57B7-01E9-4239-AD8E-FE3E1058650E@aim.com> <000001ce2ba7$f401e220$dc05a660$@ac.kr> Message-ID: <20130329052340.GA25353@infinet.ru> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: ath9k-devel@lists.ath9k.org Hi, If you able to add small piece of code to the driver, you can do the following: Construct a single aggregate with desired parameters, NoAck bit set and 1 retry count in the first retry series. Link last descriptor of the aggregate to the first and drop this bomb into any TX queue. The aggregate should be in accordance with the 802.11n, i.e. contain <64K of data+delimeters+FCS and be 4ms or shorter. In case when no other signals in the medium this gives you 100% transmit time except the small silence periods required by the standard. But IMO, measuring TX power with a SA is not the best way. Using a much cheaper power meter set up to measure on first 16us of each packet (preamble) is better. It allows you to get a valid result with single packet shot. About modulations used in 11n: MCS Modulation 0,8,16 BPSK 1,2,9,10,17,18 QPSK 3,4,11,12,19,20 QAM16 5,6,7,13,14,15,21,22,23 QAM64 52 subcarriers in 20MHz bandwidth and 108 in 40MHz. Regards, Alex.