OMNeT++多行註解方式

框選起來後，按下
Ctrl + /

ps.解除的方式就重複一次上述指令

vim 指令大全

一般模式

• 上: k, 下: j, 左: h, 右: l

• 復原(回到上一步動作): u
• 重做(執行下一步動作): ctrl + r
• 進入編輯模式: a, i, o
• 剪下整行: dd
• 貼上整行: yy
• 剪下一個字: x

• 跳到行首: ^
• 跳到行尾: $
• 跳到第一行: gg
• 跳到最後一行: shift + g

• 查看檔案路徑:  :f
• 更新目前檔案:  :e
• 開出水平新視窗:   :vs [檔名]
• 設定看見(不見)行數:  :set nu (:set nonu)
• 設定對期:  :set ai (:set noai)
• 暫時離開: :!
• 觀看terminal下的指令:  :! [指令]      e.g., :! grep -nr myBook *
• 再多視窗之間轉跳: ctrl + w 在按w
• 把現在這行指標之後的文字消除並進入編輯模式: ctrl + c

編輯模式

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指令模式

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Git for Win 7

Download the Git for Windows 7
http://git-scm.com/download/win

Git command sets

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Slot time & SIFS for IEEE 802.11 a/b/g/n/ac

802.11a @ 5 GHz
slot time = 9 us, SIFS = 16 us

802.11b @ 2.4 GHz
slot time = 20 us, SIFS = 10 us

802.11g @ 2.4 GHz
slot time = 9 us, SIFS = 10 us

802.11n
@ 2.4 GHz
slot time = 9 us(short) or 20 us(long), SIFS = 10 us
@ 5 GHz
slot time = 9 us, SIFS = 16 us

802.11ac @ 5 GHz
slot time = 9 us, SIFS = 16 us

Frame Tx Time Calculation for IEEE 802.11a/b/g/n/ac

1. IEEE 802.11b @ 20 MHz 
TXTIME = PreambleLength + PLCPHeaderTime + Ceiling(((LENGTH+PBCC) × 8) / DATARATE)

• PreambleLength = 144 us if using "Long Preamble"
                             = 72 us if using "Short Preamble"
• PLCPHeaderTime = 48 us if using "Long Preamble"
                                = 24 us if using "Short Preamble"
• LENGTH is number of bytes for Transmission Frame
• PBCC = 1 if using PBCC, otherwise is 0.
• DATARATE is data rate in bps for 802.11 (e.g., 1, 2, 5.5, 11 Mbps)

2. IEEE 802.11a @ 20 MHz 
TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM × Ceiling ((16 + 8 × LENGTH + 6)/N_DBPS)
                = 16 us + 4 us + 4 us × Ceiling ((16 + 8 × LENGTH + 6)/N_DBPS)

3. IEEE 802.11g @ 20 MHz 
TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM × Ceiling ((16 + 8 × LENGTH + 6)/NDBPS)
+ Signal Extension
                = 16 us + 4 us + 4 us × Ceiling ((16 + 8 × LENGTH + 6)/N_DBPS) + 6 us

4. IEEE 802.11n @ 20 MHz 
4.1 HT-mixed mode with short Guard Interval (GI)
TXTIME = T_{LEG_PREAMBLE} + T_{L_SIG} + T_{HT_PREAMBLE} + T_{HT_SIG} + T_SYM × Ceiling (T_SYMS × N_SYM / T_SYM) + SignalExtension

4.2 HT-mixed mode with normal GI
T_{LEG_PREAMBLE} + T_{L_SIG} + T_{HT_PREAMBLE} + T_{HT_SIG} + T_SYM × N_SYM + SignalExtension

4.3 HT-greenfield with short GI
TXTIME = T_{GF_HT_PREAMBLE} + T_{HT_SIG} + T_SYMS × N_SYM + SignalExtension

4.4 HT-greenfield with normal GI
TXTIME = T_{GF_HT_PREAMBLE} + T_{HT_SIG} + T_SYM × N_SYM + SignalExtension

5. IEEE 802.11ac @ 20 MHz