Method and apparatus for variable header repetition in a wireless OFDM network with multiple overlapped frequency bands
Method and apparatus for use within a wireless OFDM network that transmits and receives first and second packets each having header bits and utilizing variable header repetition. The header bits in the first packet are communicated on multiple OFDM symbols and repeated on a plurality of OFDM subcarriers in a first frequency band. The header bits in a second packet are communicated on fewer OFDM symbols and in a second frequency band that overlaps with and is wider than the first frequency band.
1. A wireless OFDM (Orthogonal Frequency Division Multiplexing) transceiver operable to:
receive, in a first narrower frequency band, by a receiver using wireless OFDM communications, a first packet comprising a first number of OFDM symbols that carry a first plurality of header bits;
demodulate, by a demodulator connected to and in communication with the receiver, the first number of OFDM symbols to determine the first plurality of header bits, wherein at least one header bit of the first plurality of header bits in the first packet is repeated on a plurality of OFDM subcarriers;
receive, in a second wider frequency band, by the receiver using wireless OFDM communications, a second packet comprising a second number of OFDM symbols, less than the first number of OFDM symbols, that carry a second plurality of header bits, different than the first plurality of header bits; and
demodulate, by the demodulator, the second number of OFDM symbols to determine the second plurality of header bits,
wherein the first narrower and second wider frequency bands have one or more overlapping frequency regions.
2. The wireless transceiver of claim 1 , wherein the at least one repeated header bit increases reliability of the first packet in the first narrower frequency band.
3. The wireless transceiver of claim 1 , wherein the at least one repeated header bit provides additional diversity to increase a likelihood of correctly decoding header information of the first packet in the first narrower frequency band.
4. The wireless transceiver of claim 1 , wherein the second wider frequency band is two times wider than the first narrower frequency band.
5. The wireless transceiver of claim 1 , wherein a first OFDM symbol in the first packet contains different header bits than a second OFDM symbol in the first packet.
6. The wireless transceiver of claim 1 , wherein a first OFDM symbol in the first packet contains the first plurality of header bits and a second OFDM symbol in the first packet contains the first plurality of header bits.
7. The wireless transceiver of claim 1 , wherein the wireless transceiver supports SmartGrid applications.
8. The wireless transceiver of claim 1 , wherein the wireless transceiver supports one or more wireless standards.
9. A wireless OFDM (Orthogonal Frequency Division Multiplexing) transceiver comprising:
a wireless OFDM communications receiver operable to receive a first packet in a first narrower frequency band, wherein the first packet comprises a first header portion received on a first number of OFDM symbols;
a demodulator, connected to the wireless OFDM communications receiver, operable to demodulate the first number of OFDM symbols to determine the first header portion, wherein at least one header bit of the first header portion in the first packet is repeated on a plurality of OFDM subcarriers;
the wireless OFDM communications receiver further operable to receive a second packet in a second wider frequency band, wherein the second packet comprises a second header portion received on a second number of OFDM symbols, less than the first number of OFDM symbols, and wherein the second header portion is different than the first header portion;
the demodulator further operable to demodulate the second number of OFDM symbols to determine the second header portion,
wherein the first narrower and second wider frequency bands have one or more overlapping frequency regions.
10. The wireless transceiver of claim 9 , wherein the at least one repeated header bit increases reliability of the first packet in the first narrower frequency band.
11. The wireless transceiver of claim 9 , wherein the at least one repeated header bit provides additional diversity to increase a likelihood of correctly decoding header information of the first packet in the first narrower frequency band.
12. The wireless transceiver of claim 9 , wherein the second wider frequency band is two times wider than the first narrower frequency band.
13. The wireless transceiver of claim 9 , wherein a first OFDM symbol in the first packet contains different header bits than a second OFDM symbol in the first packet.
14. The wireless transceiver of claim 9 , wherein a first OFDM symbol in the first packet contains the first plurality of header bits and a second OFDM symbol in the first packet contains the first plurality of header bits.
15. The wireless transceiver of claim 9 , wherein the wireless transceiver supports SmartGrid applications.
16. The wireless transceiver of claim 9 , wherein the wireless transceiver supports one or more wireless standards.
17. A method of operating a wireless OFDM (Orthogonal Frequency Division Multiplexing) transceiver comprising:
receiving, in a first narrower frequency band, by a receiver using wireless OFDM communications, a first packet comprising a first number of OFDM symbols that carry a first plurality of header bits;
demodulating, by a demodulator connected to the receiver, the first number of OFDM symbols to determine the first plurality of header bits, wherein at least one header bit of the first plurality of header bits in the first packet is repeated on a plurality of OFDM subcarriers;
receiving, in a second wider frequency band, by the receiver using wireless OFDM communications, a second packet comprising a second number of OFDM symbols, less than the first number of OFDM symbols, that carry a second plurality of header bits, different than the first plurality of header bits; and
demodulating, by the demodulator, the second number of OFDM symbols to determine the second plurality of header bits,
wherein the first narrower and second wider frequency bands have one or more overlapping frequency regions.
18. The method of claim 17 , wherein a first OFDM symbol of the first packet contains different header bits than a second OFDM symbol of the first packet.
19. The method of claim 17 , wherein a first OFDM symbol of the first packet contains the first plurality of header bits and a second OFDM symbol of the first packet contains the first plurality of header bits.
20. The method of claim 17 , wherein the wireless transceiver supports SmartGrid applications.
21. The method of claim 17 , wherein the wireless transceiver supports one or more wireless standards.
22. The method of claim 17 , wherein the second wider frequency band two times wider than the first narrower frequency band.
23. The method of claim 17 , the at least one repeated header bit increases reliability of the first packet in the first narrower frequency band.
24. The method of claim 17 , wherein the at least one repeated header bit provides additional diversity to increase a likelihood of correctly decoding header information of the first packet in the first narrower frequency band.
25. A method in a wireless OFDM (Orthogonal Frequency Division Multiplexing) transceiver comprising:
receiving, by a wireless OFDM communications receiver, a first packet in a first narrower frequency band, wherein the first packet comprises a first header portion received on a first number of OFDM symbols;
demodulating, by a demodulator connected to the wireless OFDM communications receiver, the first number of OFDM symbols to determine the first header portion, wherein at least one header bit of the first header portion in the first packet is repeated on a plurality of OFDM subcarriers;
receiving, a second packet in a second wider frequency band, by the wireless OFDM communications receiver, wherein the second packet comprises a second header portion received on a second number of OFDM symbols, less than the first number of OFDM symbols, and wherein the second header portion is different than the first header portion;
demodulate, by the demodulator, the second number of OFDM symbols to determine the second header portion,
wherein the first narrower and second wider frequency bands have one or more overlapping frequency regions.
26. The method of claim 25 , wherein the at least one repeated header bit increases reliability of the first packet in the first narrower frequency band.
27. The method of claim 25 , wherein the at least one repeated header bit provides additional diversity to increase a likelihood of correctly decoding header information of the first packet in the first narrower frequency band.
28. The method of claim 25 , wherein the second wider frequency band is two times wider than the first narrower frequency band.
29. The method of claim 25 , wherein a first OFDM symbol in the first packet contains different header bits than a second OFDM symbol in the first packet.
30. The wireless method of claim 25 , wherein a first OFDM symbol in the first packet contains the first plurality of header bits and a second OFDM symbol in the first packet contains the first plurality of header bits.
31. The method of claim 25 , wherein the wireless transceiver supports SmartGrid applications.
32. The method of claim 25 , wherein the wireless transceiver supports one or more wireless standards.