Legacy Short Training Field (L-STF) The legacy short training OFDM symbol is identical to the 802.11a short training OFDM symbol. The L-STF is BPSK modulated at 6 Mbps. It contains no channel coding, and is not scrambled. The L-STF has a period of 0.8 µs. The entire short training field includes ten such periods, with a total duration of 8 µs.
Legacy Long Training Field (L-LTF) The legacy long training OFDM symbol is identical to the 802.11a long training OFDM symbol. The L-LTF is BPSK modulated at 6 Mbps. It contains no channel coding, and is not scrambled.
Legacy Signal Field (L-SIG) The signal field is used to transfer rate and length information. The L-SIG consists of one OFDM symbol assigned to all 52 subcarriers. This symbol is BPSK modulated at 6 Mbps and is encoded at a ½ rate. L-SIG is interleaved and mapped, and has pilots inserted in subcarriers –21, –7, 7 and 21. The L-SIG is not scrambled.
High Throughput Signal Field (HT-SIG) The high throughput signal field is used to carry information required to interpret the HT packet formats. The HT-SIG is composed of two parts HTSIG1 and HTSIG2, each containing 24 bits. All the fields in the HT-SIG are transmitted LSB first.
High Throughput Short Training Field (HT-STF) The purpose of the High Throughput Short Training Field is to improve AGC (Automatic Gain Control) training in a multi-transmit and multi-receive system. The duration of the HT-STF is 4μsec.
High Throughput Long Training Field (HT-LTF) The High Throughput Long Training field provides means for the receiver to estimate the channel between each spatial mapping input (or spatial stream transmitter if no STBC is applied) and receive chain; the number of training symbols is equal or greater than the number of space-time streams
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