Method and apparatus for transmitting PLCP frame in wireless local area network system
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 device for receiving data in a wireless local area network comprising:
a transceiver configured to receive a data frame, the data frame comprising:
a legacy signal field including a first symbol that is mapped onto a first binary phase shift keying (BPSK) constellation;
a Very High Throughput Signal (VHT-SIG) field including a second symbol and a third symbol, the second symbol being mapped onto the first BPSK constellation, and the third symbol being mapped onto a second BPSK constellation, and the second BSPK constellation being rotated by 90° counter-clockwise relative to the first BPSK constellation; and
wherein the second symbol includes an indicator indicating Single User-Multiple Input Multiple Output (SU-MIMO) transmission or multi user-MIMO (MU-MIMO) transmission, and the third symbol includes a cyclic redundancy check (CRC) for the second symbol and, at least a portion of, the third symbol.
2. The device of claim 1 , wherein the transceiver comprises a processor and a memory, the memory having stored therein a software module that, when executed by the processor, cause the transceiver to receive the data frame.
3. The device of claim 1 , wherein the third symbol is immediately after the second symbol.
4. The device of claim 1 , wherein the data frame is a Physical Layer Convergence Procedure Protocol Data Unit (PPDU).
5. The device of claim 4 , wherein the PPDU omits a high throughput signal (HT 13 SIG) field between the legacy field and the VHT-SIG field.
6. The device of claim 1 , wherein the VHT-SIG field further includes a multiplexing number indicating a number of spatial streams.
7. The device of claim 6 , wherein the second symbol includes the multiplexing number indicating the number of spatial streams.
8. The device of claim 1 , wherein the VHT-SIG field is immediately after the legacy field.
9. The device of claim 1 , wherein the second symbol is immediately after the first symbol.
10. The device of claim 1 , wherein:
the data frame is a PPDU;
the PPDU omits an HT 13 SIG field between the legacy field and the VHT-SIG field;
the second symbol is immediately after the first symbol; and
the third symbol is immediately after the second symbol.
11. The device of claim 10 , wherein the transceiver comprises a processor and a memory, the memory having stored therein a software module that, when executed by the processor, cause the transceiver to receive the data frame.
12. The device of claim 1 , further comprising at least one antenna, wherein the transceiver receives the data frame by way of the at least one antenna.
13. A method for receiving data in a wireless local area network, performed by a receiver, the method comprising:
receiving a data frame, the data frame comprising:
a legacy signal field including a first symbol that is mapped onto a first binary phase shift keying (BPSK) constellation;
a Very High Throughput Signal (VHT-SIG) field including a second symbol and a third symbol, the second symbol being mapped onto the first BPSK constellation, and the third symbol being mapped onto a second BPSK constellation, and the second BSPK constellation being rotated by 90° counter-clockwise relative to the first BPSK constellation; and
wherein the second symbol includes an indicator indicating Single User-Multiple Input Multiple Output (SU-MIMO) transmission or multi user-MIMO (MU-MIMO) transmission, and the third symbol includes a cyclic redundancy check (CRC) for the second symbol and, at least a portion of, the third symbol.
14. The method of claim 13 , wherein the third symbol is immediately after the second symbol.
15. The method of claim 13 , wherein the data frame is a Physical Layer Convergence Procedure Protocol Data Unit (PPDU).
16. The method of claim 15 , wherein the PPDU omits a high throughput signal (HT_SIG) field between the legacy field and the VHT-SIG field.
17. The method of claim 13 , wherein the VHT-SIG field further includes a multiplexing number indicating a number of spatial streams.
18. The method of claim 13 , wherein the VHT-SIG field is immediately after the legacy field.
19. The method of claim 13 , wherein the second symbol is immediately after the first symbol.
20. The method of claim 13 , wherein:
the data frame is a PPDU;
the PPDU omits an HT_SIG field between the legacy field and the VHT-SIG field;
the second symbol is immediately after the first symbol; and
the third symbol is immediately after the second symbol.