Non-transitory computer-readable information storage media for variable header repetition in a wireless OFDM network
A non-transitory computer-readable information storage media for use within a wireless OFDM network that causes to be transmitted or received a first packet type and a second packet type. The first packet type has a header field with two parts with each part comprising a different set of header bits. The two parts of the header field are transmitted or received using two OFDM symbols. The second packet type has a header field with four parts with the first and second parts comprising the same first set of header bits and the third and the fourth part comprising the same second set of header bits. The four parts of the header field are transmitted or received using four OFDM symbols. The second packet type provides more reliable transmission or reception than the first packet type.
1. A non-transitory computer-readable information storage media, having stored thereon instructions, that when executed by one or more processors in a transceiver, cause to be performed a method comprising:
generating, by a wireless Orthogonal Frequency Division Multiplexing (OFDM) communications transmitter, a first packet type comprising a first header field, wherein the first header field comprises two parts, a first part comprising a first set of header bits of the first header field and a second part comprising a second set of header bits of the first header field, wherein the first set of header bits of the first header field is different than the second set of header bits of the first header field;
generating, by an encoder and a modulator, a first OFDM symbol followed by a second OFDM symbol, wherein the first OFDM symbol is used to transmit the first part of the first header field and the second OFDM symbol is used to transmit the second part of the first header field;
transmitting, by the wireless OFDM communications transmitter, the first packet type over a wireless communication channel;
generating, by the wireless OFDM communications transmitter, a second packet type comprising a second header field, wherein the second header field comprises four parts, a first part comprising a first set of header bits of the second header field, a second part comprising a second set of header bits of the second header field, a third part comprising a third set of header bits of the second header field and a fourth part comprising a fourth set of header bits of the second header field,
wherein the first set of header bits of the second header field is the same as the second set of header bits of the second header field, wherein the third set of header bits of the second header field is the same as the fourth set of header bits of the second header field;
generating, by the encoder and the modulator, a first OFDM symbol followed by a second OFDM symbol followed by a third OFDM symbol followed by a fourth OFDM symbol, wherein the first OFDM symbol is used to transmit the first part of the second header field, the second OFDM symbol is used to transmit the second part of the second header field, the third OFDM symbol is used to transmit the third part of the second header field, the fourth OFDM symbol is used to transmit the fourth part of the second header field,
wherein the second set of header bits of the second header field transmitted using the second OFDM symbol are transmitted in a different order than the first set of header bits of the second header field transmitted using the first OFDM symbol,
wherein the fourth set of header bits of the second header field transmitted using the fourth OFDM symbol are transmitted in a different order than the third set of header bits of the second header field transmitted using the third OFDM symbol; and
transmitting, by the wireless OFDM communications transmitter, the second packet type over the wireless communication channel.
2. The media of claim 1 , wherein the transmission of the same header bits in the second OFDM symbol provides diversity to increase a likelihood of correctly communicating header information of the second packet type.
3. The media of claim 1 , wherein the transmission of the same header bits in the fourth OFDM symbol provides diversity to increase a likelihood of correctly communicating header information of the second packet type.
4. The media of claim 1 , wherein the wireless transceiver supports SmartGrid applications.
5. The media of claim 1 , wherein the wireless transceiver supports one or more wireless standards.
6. The media of claim 1 , wherein a MAP (Media Access Plan) frame indicates whether two or four OFDM symbols are used to transmit header bits.
7. The media of claim 1 , wherein the first packet type is transmitted in a first channel bandwidth and the second packet type is transmitted in a second channel bandwidth, wherein the first channel bandwidth is at least two times wider than the second channel bandwidth.
8. The media of claim 7 , wherein the transmission of the same header bits in the second OFDM symbol provides diversity to increase a likelihood of correctly communicating header information of the second packet type.
9. The media of claim 7 , wherein the transmission of the same header bits in the fourth OFDM symbol provides diversity to increase a likelihood of correctly communicating header information of the second packet type.
10. The media of claim 9 , wherein the first packet type is transmitted to a first transceiver and the second packet type is transmitted to a second transceiver, different than the first transceiver.
11. A non-transitory computer-readable information storage media, having stored thereon instructions, that when executed by one or more processors in a transceiver, cause to be performed a method comprising:
receiving, by a wireless Orthogonal Frequency Division Multiplexing (OFDM) communications receiver over a wireless communication channel, a first packet type comprising a first header field, wherein the first header field comprises two parts, a first part comprising a first set of header bits of the first header field and a second part comprising a second set of header bits of the first header field, wherein the first set of header bits of the first header field is different than the second set of header bits of the first header field;
demodulating, by a demodulator, a first OFDM symbol followed by a second OFDM symbol, wherein the first OFDM symbol is used to receive the first part of the first header field and the second OFDM symbol is used to receive the second part of the first header field;
receiving, by the wireless OFDM communications receiver over the wireless communication channel, a second packet type comprising a second header field, wherein the second header field comprises four parts, a first part comprising a first set of header bits of the second header field, a second part comprising a second set of header bits of the second header field, a third part comprising a third set of header bits of the second header field and a fourth part comprising a fourth set of header bits of the second header field,
wherein the first set of header bits of the second header field is the same as the second set of header bits of the second header field, wherein the third set of header bits of the second header field is the same as the fourth set of header bits of the second header field; and
demodulating, by the demodulator, a first OFDM symbol followed by a second OFDM symbol followed by a third OFDM symbol followed by a fourth OFDM symbol, wherein the first OFDM symbol is used to receive the first part of the second header field, the second OFDM symbol is used to receive the second part of the second header field, the third OFDM symbol is used to receive the third part of the second header field, the fourth OFDM symbol is used to receive the fourth part of the second header field,
wherein the second set of header bits of the second header field received using the second OFDM symbol are received in a different order than the first set of header bits of the second header field received using the first OFDM symbol, and
wherein the fourth set of header bits of the second header field received using the fourth OFDM symbol are received in a different order than the third set of header bits of the second header field received using the third OFDM symbol.
12. The media of claim 11 , wherein the reception of the same header bits in the second OFDM symbol provides diversity to increase a likelihood of correctly receiving header information of the second packet type.
13. The media of claim 11 , wherein the reception of the same header bits in the fourth OFDM symbol provides diversity to increase a likelihood of correctly receiving header information of the second packet type.
14. The media of claim 11 , wherein the wireless transceiver supports SmartGrid applications.
15. The media of claim 11 , wherein the wireless transceiver supports one or more wireless standards.
16. The media of claim 11 , wherein a MAP (Media Access Plan) frame indicates whether two or four OFDM symbols are used to receive header bits.
17. The media of claim 11 , wherein the first packet type is received in a first channel bandwidth and the second packet type is received in a second channel bandwidth, wherein the first channel bandwidth is at least two times wider than the second channel bandwidth.
18. The media of claim 17 , wherein the reception of the same header bits in the second OFDM symbol provides diversity to increase a likelihood of correctly receiving header information of the second packet type.
19. The media of claim 17 , wherein the reception of the same header bits in the fourth OFDM symbol provides diversity to increase a likelihood of correctly receiving header information of the second packet type.
20. The media of claim 11 , wherein the first packet type is received from a first transceiver and the second packet type is received from a second transceiver, different than the first transceiver.