Method and apparatus for transmitting PLCP frame in wireless local area network system
View Patent ↗A method of transmitting a Physical Layer Convergence Procedure (PLCP) frame in a Very High Throughput (VHT) Wireless Local Area Network (WLAN) system includes generating a MAC Protocol Data Unit (MPDU) to be transmitted to a destination station (STA), generating a PLCP Protocol Data Unit (PPDU) by adding a PLCP header, including an L-SIG field containing control information for a legacy STA and a VHT-SIG field containing control information for a VHT STA, to the MPDU, and transmitting the PPDU to the destination STA. A constellation applied to some of Orthogonal Frequency Division Multiplex (OFDM) symbols of the VHT-SIG field is obtained by rotating a constellation applied to an OFDM symbol of the L-SIG field.
1. A method of transmitting data in a wireless local area network, performed by a transmitter, the method comprising:
mapping a signal field onto a first binary phase shift keying (BPSK) constellation;
mapping a first Very High Throughput Signal (VHT-SIG) field onto the first BPSK constellation;
mapping a second VHT-SIG field onto a second BPSK constellation;
transmitting the mapped signal field in a first Orthogonal Frequency Division Multiplex (OFDM) symbol;
transmitting the mapped first VHT-SIG field in a second OFDM symbol; and
transmitting the mapped second VHT-SIG field in a third OFDM symbol,
wherein the second OFDM symbol is contiguous with the third OFDM symbol,
wherein the second BSPK constellation is rotated by 90° counter-clockwise relative to the first BPSK constellation, and
wherein the first VHT-SIG field includes an indicator indicating Single User-Multiple Input Multiple Output (SU-MIMO) transmission or multi user-MIMO (MU-MIMO) transmission, and the second VHT-SIG field includes a cyclic redundancy check (CRC) for the first and second VHT-SIG fields.
2. The method of claim 1 , wherein the signal field, the first VHT-SIG field and the second VHT-SIG field are included in a physical layer convergence procedure (PLCP) header.
3. The method of claim 1 , wherein the first VHT-SIG field further includes a multiplexing number indicating a number of spatial streams.
4. A wireless apparatus configured for transmitting data in a wireless local area network, the wireless apparatus comprising:
a frame generation unit configured for mapping a signal field onto a first binary phase shift keying (BPSK) constellation, mapping a first Very High Throughput Signal (VHT-SIG) field onto the first BPSK constellation and mapping a second VHT-SIG field onto a second BPSK constellation; and
a frame transmission unit configured for transmitting the mapped signal field in a first Orthogonal Frequency Division Multiplex (OFDM) symbol, transmitting the mapped first VHT-SIG field in a second OFDM symbol and transmitting the mapped second VHT-SIG field in a third OFDM symbol,
wherein the second OFDM symbol is contiguous with the third OFDM symbol,
wherein the second BSPK constellation is rotated by 90° counter-clockwise relative to the first BPSK constellation, and
wherein the first VHT-SIG field includes an indicator indicating Single User-Multiple Input Multiple Output (SU-MIMO) transmission or multi user-MIMO (MU-MIMO) transmission, and the second VHT-SIG field includes a cyclic redundancy check (CRC) for the first and second VHT-SIG fields.
5. The wireless apparatus of claim 4 , wherein the first VHT-SIG field further includes a multiplexing number indicating a number of spatial streams.