Frequency duplication mode for use in wireless local area networks (WLANs)
View Patent ↗In generating a physical layer (PHY) frequency duplication mode data unit for transmission via a communication channel, a preamble of the PHY frequency duplication mode data unit is generated. The preamble includes a signal field, and the preamble is configured so that a receiver can determine that the data unit is a frequency duplication mode-type data unit prior to decoding the signal field of the preamble. A payload of the PHY frequency duplication mode data unit is generated, and the PHY frequency duplication mode data unit is transmitted.
1. A method for generating a physical layer (PHY) frequency duplication mode data unit for transmission via a communication channel, the method comprising:
generating a preamble of the PHY frequency duplication mode data unit, wherein the preamble includes a signal field, and wherein the preamble is configured so that a receiver can determine that the data unit is a frequency duplication mode-type data unit prior to decoding the signal field of the preamble;
generating a payload of the PHY frequency duplication mode data unit; and
causing the PHY frequency duplication mode data unit to be transmitted.
2. The method of claim 1 , wherein generating the preamble comprises generating a training field of the preamble, wherein the training field of the preamble is different than training fields utilized in non-frequency duplication mode data units at corresponding positions in the non-frequency duplication mode data units.
3. The method of claim 2 , wherein the training field of the preamble is orthogonal or near orthogonal with a training field utilized in a non-frequency duplication mode data unit at a corresponding position in the non-frequency duplication mode data unit.
4. The method of claim 1 , wherein generating the preamble comprises modulating a field of the preamble using a first modulation technique that is different than a second modulation technique utilized to modulate a field in a non-frequency duplication mode data unit at a corresponding position in the non-frequency duplication mode data unit.
5. The method of claim 4 , wherein:
the first modulation technique is one of (i) binary phase shift keying (BPSK), or (ii) quaternary binary phase shift keying (QBPSK); and
the second modulation technique is the other one of (i) BPSK, or (ii) QBPSK.
6. The method of claim 1 , wherein generating the preamble comprises:
generating a first training field of the preamble, wherein the first training field of the preamble is different than a training field utilized in a first non-frequency duplication mode data unit at a corresponding position in the first non-frequency duplication mode data units; and
modulating one of (i) a second training field of the preamble, or (ii) a signal field of the preamble using a first modulation technique that is different than a second modulation technique utilized to modulate a field in a second non-frequency duplication mode data unit at a corresponding position in the second non-frequency duplication mode data unit.
7. The method of claim 6 , wherein:
the first non-frequency duplication mode data unit has a bandwidth equal to a bandwidth of the PHY frequency duplication mode data unit; and
the second non-frequency duplication mode data unit has a bandwidth equal to a fraction of the bandwidth of the PHY frequency duplication mode data unit.
8. The method of claim 6 , wherein:
the first non-frequency duplication mode data unit has a bandwidth equal to a fraction of a bandwidth of the PHY frequency duplication mode data unit; and
the second non-frequency duplication mode data unit has a bandwidth equal to the bandwidth of the PHY frequency duplication mode data unit.
9. The method of claim 1 , wherein causing the PHY frequency duplication mode data unit to be transmitted comprises causing a training field of the preamble to be transmitted at a higher power than remaining portions of the PHY frequency duplication mode data unit.
10. The method of claim 9 , wherein causing the PHY frequency duplication mode data unit to be transmitted comprises causing the training field of the preamble to be transmitted at a power 3 dB higher than the power of the remaining portions of the PHY frequency duplication mode data unit.
11. An apparatus for generating a physical layer (PHY) data unit for transmission via a communication channel, the apparatus comprising:
a network interface configured to
generate a preamble of the PHY frequency duplication mode data unit, wherein the preamble includes a signal field, and wherein the preamble is configured so that a receiver can determine that the data unit is a frequency duplication mode-type data unit prior to decoding the signal field of the preamble,
generate a payload of the PHY frequency duplication mode data unit, and
transmit the PHY frequency duplication mode data unit.
12. The apparatus of claim 11 , wherein the network interface is configured to generate a training field of the preamble, wherein the training field of the preamble is different than training fields utilized in non-frequency duplication mode data units at corresponding positions in the non-frequency duplication mode data units.
13. The apparatus of claim 12 , wherein the training field of the preamble is orthogonal or near orthogonal with a training field utilized in a non-frequency duplication mode data unit at a corresponding position in the non-frequency duplication mode data unit.
14. The apparatus of claim 11 , wherein the network interface is configured to modulate a field of the preamble using a first modulation technique that is different than a second modulation technique utilized to modulate a field in a non-frequency duplication mode data unit at a corresponding position in the non-frequency duplication mode data unit.
15. The apparatus of claim 14 , wherein:
the first modulation technique is one of (i) binary phase shift keying (BPSK), or (ii) quaternary binary phase shift keying (QBPSK); and
the second modulation technique is the other one of (i) BPSK, or (ii) QBPSK.
16. The apparatus of claim 11 , wherein the network interface is configured to:
generate a first training field of the preamble, wherein the first training field of the preamble is different than a training field utilized in a first non-frequency duplication mode data unit at a corresponding position in the first non-frequency duplication mode data units, and
modulate one of (i) a second training field of the preamble, or (ii) a signal field of the preamble using a first modulation technique that is different than a second modulation technique utilized to modulate a field in a second non-frequency duplication mode data unit at a corresponding position in the second non-frequency duplication mode data unit.
17. The apparatus of claim 16 , wherein:
the first non-frequency duplication mode data unit has a bandwidth equal to a bandwidth of the PHY frequency duplication mode data unit; and
the second non-frequency duplication mode data unit has a bandwidth equal to a fraction of the bandwidth of the PHY frequency duplication mode data unit.
18. The apparatus of claim 16 , wherein:
the first non-frequency duplication mode data unit has a bandwidth equal to a fraction of a bandwidth of the PHY frequency duplication mode data unit; and
the second non-frequency duplication mode data unit has a bandwidth equal to the bandwidth of the PHY frequency duplication mode data unit.
19. The apparatus of claim 11 , wherein the network interface is configured to transmit the training field of the preamble at a higher power than remaining portions of the PHY frequency duplication mode data unit.
20. The apparatus of claim 19 , wherein the network interface is configured to transmit the training field of the preamble at a power 3 dB higher than the power of the remaining portions of the PHY frequency duplication mode data unit.