Patent ID: 8072959

Claim:
A generating method for short training field in IEEE 802.11n communication systems, comprising the steps of: storing only a first set of time-domain High-Throughput Short Training Field (HT-STF) sequences in a memory; and deriving a second set of the time-domain HT-STF sequences from the first set of the time-domain HT-STF sequences; wherein the first set of time-domain HT-STF sequences is a time-domain HT-STF sequences (y n ) for lower 20 MHz of 40 MHz bandwidth (BW) configuration, based on the relation as y n = 1 128 â¢ âˆ‘ k = - 64 63 â¢ Y k â¢ W 128 - nk ; where â¢ W 128 = â…‡ - j2Ï€ / 128 ; n = 0 , 1 , 2 , â€¦ â¢ â¢ 31 ; wherein j is âˆš{square root over (âˆ’1)} and Y k is a first set of frequency-domain HT-STF sequences (Y k ) for lower 20 MHz of 40 MHz BW configuration defined as: Y âˆ’64,63 =âˆš{square root over (1/2)}{0,0,0,0,0,0,0,0,1+ j ,0,0,0,âˆ’1âˆ’ j ,0,0,0,1+ j, 0,0,0,âˆ’1âˆ’ j, 0,0,0,âˆ’1âˆ’ j, 0,0,0,1+ j, 0,0,0, 0,0,0,0,âˆ’1âˆ’ j, 0,0,0,âˆ’1âˆ’ j ,0,0,0,1+ j, 0,0,0,1+ j, 0,0,0,1+ j ,0,0,0,1+ j ,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}.