METHODS AND APPARATUS FOR TRANSMITTER IDENTIFICATION IN A WIRELESS NETWORK

• US 20090028100A1
• Filed: 08/06/2007
• Published: 01/29/2009
• Est. Priority Date: 07/25/2007
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Krishnamoorthi, Raghuraman, Mukkavilli, Krishna Kiran, Mantravadi, Ashok, Chari, Murali Ramaswamy
• Application Number:
  US11/834,654
• Publication Number:
  US 20090028100A1
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/26136 Pilot sequence conveying additional information
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver

Abstract

Methods and apparatus for transmitter identification in a wireless network are disclosed. In an example, a method is provided that encodes pilot information on a first portion of a number of subcarriers in a symbol within a pilot positioning channel for an active transmitter. The method further includes encoding transmitter identification information on a second dedicated portion of the number of subcarriers of the symbol. The method also encompasses including a transmitter allocation field that signals the number of succeeding symbols that will be used by the transmitter for transmitting any other information in an interference free manner. In another example, a method is provided that receives a symbol having a number of subcarriers from a transmitter. A channel estimate and an energy measurement of the symbol using a first portion of the subcarriers. A dedicated second portion of the number of subcarriers in the symbol are then decoded to determine the transmitter identification information.

Claims

1. A method for communicating transmitter identification in a communication system, the method comprising:

encoding pilot information on a first portion of a plurality of subcarriers in a symbol for an active transmitter; and

encoding transmitter identification information on a second portion of the plurality of subcarriers of the symbol.

2. The method as defined in claim 1, wherein the first portion of the plurality of subcarriers comprises at least first and second interlaces and the second portion of the plurality of subcarriers comprises at least a third interlace.

3. The method as defined in claim 2, wherein the pilot information is scrambled in the first interlace with a wide area identifier and is scrambled in the at least second interlaces with the wide area identifier and a local area identifier.

4. The method as defined in claim 2, wherein the transmitter identification information is encoded in at least the third interlace.

5. The method as defined in claim 1, wherein the symbol is a positioning pilot channel symbol.

6. The method as defined in claim 1 wherein the transmitter identification information includes at least one of a transmitter identification field, a transmitter allocation field, and cyclic redundancy check bits.

7. The method as defined in claim 6, wherein the transmitter allocation field is configured to communicate whether subsequent symbols including further data will be transmitted.

8. The method as defined in claim 1, further comprising:

transmitting transmitter allocation data within the transmitter identification information indicating the allocation of one or more subsequent symbols for a transmitter specific channel used to communicate further data.

9. The method as defined in claim 8, wherein a portion of the subcarriers in the one or more subsequent symbols data are used for the transmitter specific channel.

10. The method as defined in claim 1 wherein the encoding of transmitter identification information includes:

interleaving information bits of the transmitter identification information;

encoding the bits using a predetermined encoding scheme;

manipulating the encoded bits to ensure number of bits matches a predetermined modulation scheme;

modulating the bits according to the predetermined modulation scheme; and

mapping the modulated bits to subcarriers in the second portion of the plurality of subcarriers of the symbol.

11. The method as defined in claim 10, wherein the predetermined encoding scheme comprises Reed-Muller encoding.

12. The method as defined in claim 10, wherein manipulating the encoded bits includes puncturing one or more encoded bits and replacing the punctured encoded bits with zero values.

13. The method as defined in claim 10, wherein the predetermined modulation scheme comprises QPSK modulation.

14. The method as defined in claim 1, wherein the communication system comprises an OFDM communication system.

15. The method as defined in claim 14, wherein the OFDM communication system is operable in at least one of 1K, 2K, 4K, and 8K Fast Fourier Transform modes.

16. The method as defined in claim 12, wherein the ODFM system is one of a Forward Link Only (FLO) system and a DVB-T/H system.

17. The method as defined in claim 1, further comprising adjusting a power level of at least one of the first and second portions of the plurality of subcarriers to ensure a power level of each transmitted symbol is maintained at a constant energy per symbol power level.

18. The method as defined in claim 17, wherein the first portion of the plurality of subcarriers comprises at least first and second interlaces and the second portion of the plurality of subcarriers comprises at least a third interlace and the power level of the third interlace is adjusted to a power level greater than a power level of the first and second interlaces, respectively.

19. The method as defined in claim 1, further comprising:

transmitting in a third portion of subcarriers in a symbol for an inactive transmitter; and

adjusting a power level of the third portion of subcarriers to ensure a power level of each transmitted symbol is maintained at a constant energy per symbol power level.

20. The method as defined in claim 1, wherein the symbol is part of a positioning pilot channel within a superframe.

21. The method as defined in claim 1, wherein the pilot information and transmitter identification information are configured to be usable for positioning determination by a receiving device.

26. The apparatus as defined in claim 21, wherein the symbol is a positioning pilot channel symbol.

27. The apparatus as defined in claim 21 wherein the transmitter identification information includes at least one of a transmitter identification field, a transmitter allocation field, and cyclic redundancy check bits.

28. The apparatus as defined in claim 27, wherein the transmitter allocation field is configured to communicate whether subsequent symbols including further data will be transmitted.

22. An apparatus for communicating transmitter identification information in a network, the apparatus comprising:

a first module configured to encode pilot information on a first portion of a plurality of subcarriers in a symbol for an active transmitter; and

a second module configured to encode transmitter identification information on a second portion of the plurality of subcarriers of the symbol.

23. The apparatus as defined in claim 22, wherein the first portion of the plurality of subcarriers comprises at least first and second interlaces and the second portion of the plurality of subcarriers comprises at least a third interlace.

24. The apparatus as defined in claim 23, wherein the first module is further configured to scramble the pilot information in the first interlace with a wide area identifier and scramble the pilot information in the at least second interlaces with the wide area identifier and a local area identifier.

25. The apparatus as defined in claim 23, wherein the second module is configured to encode the transmitter identification information in at least the third interlace.

29. The apparatus as defined in claim 22, wherein the apparatus is further configured to transmit transmitter allocation data within the transmitter identification information indicating the allocation of one or more subsequent symbols for a transmitter specific channel used to communicate further data.

30. The apparatus as defined in claim 29, wherein a portion of the subcarriers in the one or more subsequent symbols data are used for the transmitter specific channel.

31. The apparatus as defined in claim 22, wherein the first module is further configured to encode the transmitter identification information by interleaving information bits of the transmitter identification information;

encoding the bits using a predetermined encoding scheme;

manipulating the encoded bits to ensure number of bits matches a predetermined modulation scheme;

modulating the bits according to the predetermined modulation scheme; and

mapping the modulated bits to subcarriers in the second portion of the plurality of subcarriers of the symbol.

32. The apparatus as defined in claim 31, wherein the predetermined encoding scheme comprises Reed-Muller encoding.

33. The apparatus as defined in claim 31, wherein manipulating the encoded bits includes puncturing one or more encoded bits and replacing the punctured encoded bits with zero values.

34. The apparatus as defined in claim 31, wherein the predetermined modulation scheme comprises QPSK modulation.

35. The apparatus as defined in claim 22, wherein the communication system comprises an OFDM communication system.

36. The apparatus as defined in claim 35, wherein the OFDM communication system is operable in at least one of 1K, 2K, 4K, and 8K Fast Fourier Transform modes.

37. The apparatus as defined in claim 35, wherein the ODFM system is one of a Forward Link Only (FLO) system and a DVB-T/H system.

38. The apparatus as defined in claim 22, further comprising:

at least one or more of the first and second modules configured to adjust a power level of at least one of the first and second portions of the plurality of subcarriers to ensure a power level of each transmitted symbol is maintained at a constant energy per symbol power level.

39. The apparatus as defined in claim 38, wherein the first portion of the plurality of subcarriers comprises at least first and second interlaces and the second portion of the plurality of subcarriers comprises at least a third interlace and the power level of the third interlace is adjusted to a power level greater than a power level of the first and second interlaces, respectively.

40. The apparatus as defined in claim 22, further comprising:

a transmitter logic configured to transmit a third portion of subcarriers in a symbol for an inactive transmitter, and adjust a power level of the third portion of subcarriers to ensure a power level of each transmitted symbol is maintained at a constant energy per symbol power level.

41. The apparatus as defined in claim 22, wherein the symbol is part of a positioning pilot channel within a superframe.

42. The apparatus as defined in claim 22, wherein the pilot information and transmitter identification information are configured to be usable for positioning determination by a receiving device.

43. An apparatus for transmitting transmitter identification information in communication system, the apparatus comprising:

means for encoding pilot information on a first portion of a plurality of subcarriers in a symbol for an active transmitter; and

means for encoding transmitter identification information on a second portion of the plurality of subcarriers of the symbol.

44. The apparatus as defined in claim 43, wherein the first portion of the plurality of subcarriers comprises at least first and second interlaces and the second portion of the plurality of subcarriers comprises at least a third interlace.

45. The apparatus as defined in claim 44, wherein the means for encoding pilot information of the first portion includes means for scrambling pilot information in the first interlace with a wide area identifier and means for scrambling the pilot information in the at least second interlaces with the wide area identifier and a local area identifier.

46. The apparatus as defined in claim 44, wherein the means for encoded the transmitter identification information on the second portion includes means for encoding the transmitter identification information in at least the third interlace.

47. The apparatus as defined in claim 43, wherein the symbol is a positioning pilot channel symbol.

48. The apparatus as defined in claim 43 wherein the transmitter identification information includes at least one of a transmitter identification field, a transmitter allocation field, and cyclic redundancy check bits.

49. The apparatus as defined in claim 48, wherein the transmitter allocation field is configured to communicate whether subsequent symbols including further data will be transmitted.

50. The apparatus as defined in claim 43, wherein the apparatus is further includes means to transmit transmitter allocation data within the transmitter identification information indicating the allocation of one or more subsequent symbols for a transmitter specific channel used to communicate further data.

51. The apparatus as defined in claim 50, wherein a portion of the subcarriers in the one or more subsequent symbols data are used for the transmitter specific channel.

52. The apparatus as defined in claim 43 wherein the means for encoding of transmitter identification information includes:

means for interleaving information bits of the transmitter identification information;

means for encoding the bits using a predetermined encoding scheme;

means for manipulating the encoded bits to ensure number of bits matches a predetermined modulation scheme;

means for modulating the bits according to the predetermined modulation scheme; and

means for mapping the modulated bits to subcarriers in the second portion of the plurality of subcarriers of the symbol.

53. The apparatus as defined in claim 52, wherein the predetermined encoding scheme comprises Reed-Muller encoding.

54. The apparatus as defined in claim 52, wherein the means for manipulating the encoded bits includes means for puncturing one or more encoded bits and replacing the punctured encoded bits with zero values.

55. The apparatus as defined in claim 52, wherein the predetermined modulation scheme comprises QPSK modulation.

56. The apparatus as defined in claim 43, wherein the communication system comprises an OFDM communication system.

57. The apparatus as defined in claim 56, wherein the OFDM communication system is operable in at least one of 1K, 2K, 4K, and 8K Fast Fourier Transform modes.

58. The apparatus as defined in claim 56, wherein the ODFM system is one of a Forward Link Only (FLO) system and a DVB-T/H system.

59. The apparatus as defined in claim 43, further comprising:

means for adjusting a power level of at least one of the first and second portions of the plurality of subcarriers to ensure a power level of each transmitted symbol is maintained at a constant energy per symbol power level.

60. The apparatus as defined in claim 59, wherein the first portion of the plurality of subcarriers comprises at least first and second interlaces and the second portion of the plurality of subcarriers comprises at least a third interlace and the power level of the third interlace is adjusted to a power level greater than a power level of the first and second interlaces, respectively.

61. The apparatus as defined in claim 43, further comprising:

means for transmitting in a third portion of subcarriers in symbol for an inactive transmitter; and

means for adjusting a power level of the third portion of subcarriers to ensure a power level of each transmitted symbol is maintained at a constant energy per symbol power level.

62. The apparatus as defined in claim 43, wherein the symbol is part of a positioning pilot channel within a superframe.

63. The apparatus as defined in claim 43, wherein the pilot information and transmitter identification information are configured to be usable for positioning determination by a receiving device.

64. A computer program product, comprising:

a computer-readable medium comprising;

code for causing a computer to encode pilot information on a first portion of a plurality of subcarriers in a symbol for an active transmitter; and

code for causing a computer to encode transmitter identification information on a second portion of the plurality of subcarriers of the symbol.

65. The computer program product as defined in claim 64, wherein the first portion of the plurality of subcarriers comprises at least first and second interlaces and the second portion of the plurality of subcarriers comprises at least a third interlace.

66. The computer program product as defined in claim 65, wherein the computer readable medium further comprises:

code for causing a computer to scramble pilot information in the first interlace with a wide area identifier and to scramble pilot information in the at least second interlaces with the wide area identifier and a local area identifier.

67. The computer program product as defined in claim 65, wherein the transmitter identification information is encoded in at least the third interlace.

68. The computer program product as defined in claim 64, wherein the symbol is a positioning pilot channel symbol.

69. The computer program product as defined in claim 64, wherein the transmitter identification information includes at least one of a transmitter identification field, a transmitter allocation field, and cyclic redundancy check bits.

70. The computer program product as defined in claim 69, wherein the transmitter allocation field is configured to communicate whether subsequent symbols including further data will be transmitted.

71. The computer program product as defined in claim 64, wherein the computer readable medium further comprises code for causing a computer to transmit transmitter allocation data within the transmitter identification information indicating the allocation of one or more subsequent symbols for a transmitter specific channel used to communicate further data.

72. The computer program product as defined in claim 70, wherein a portion of the subcarriers in the one or more subsequent symbols data are used for the transmitter specific channel.

73. The computer program product as defined in claim 64, wherein the computer readable medium further comprises:

code for interleaving information bits of the transmitter identification information;

code for encoding the bits using a predetermined encoding scheme;

code for manipulating the encoded bits to ensure number of bits matches a predetermined modulation scheme;

code for modulating the bits according to the predetermined modulation scheme; and

code for mapping the modulated bits to subcarriers in the second portion of the plurality of subcarriers of the symbol.

74. The computer program product as defined in claim 73, wherein the predetermined encoding scheme comprises Reed-Muller encoding.

75. The computer program product as defined in claim 73, wherein the code for manipulating the encoded bits further includes code for puncturing one or more encoded bits and replacing the punctured encoded bits with zero values.

76. The computer program product as defined in claim 73, wherein the predetermined modulation scheme comprises QPSK modulation.

77. The computer program product as defined in claim 64, wherein the communication system comprises an OFDM communication system.

78. The computer program product as defined in claim 77, wherein the OFDM communication system is operable in at least one of 1K, 2K, 4K, and 8K Fast Fourier Transform modes.

79. The computer program product as defined in claim 77, wherein the ODFM system is one of a Forward Link Only (FLO) system and a DVB-T/H system.

80. The computer program product as defined in claim 64, wherein the computer readable medium further comprises:

code for adjusting a power level of at least one of the first and second portions of the plurality of subcarriers to ensure a power level of each transmitted symbol is maintained at a constant energy per symbol power level.

81. The computer program product as defined in claim 80, wherein the first portion of the plurality of subcarriers comprises at least first and second interlaces and the second portion of the plurality of subcarriers comprises at least a third interlace and the power level of the third interlace is adjusted to a power level greater than a power level of the first and second interlaces, respectively.

82. The computer program product as defined in claim 64, wherein the computer readable medium further comprises:

code for transmitting in a third portion of subcarriers in symbol for an inactive transmitter; and

code for adjusting a power level of the third portion of subcarriers to ensure a power level of each transmitted symbol is maintained at a constant energy per symbol power level.

83. The computer program product as defined in claim 64, wherein the symbol is part of a positioning pilot channel within a superframe.

84. The computer program product as defined in claim 64, wherein the pilot information and transmitter identification information are configured to be usable for positioning determination by a receiving device.

85. At least one processor configured to perform a method for transmitting transmitter identification information in a network, the method comprising:

encoding pilot information on a first portion of a plurality of subcarriers in a symbol for an active transmitter; and

encoding transmitter identification information on a second portion of the plurality of subcarriers of the symbol.

86. The at least one processor as defined in claim 85, wherein the first portion of the plurality of subcarriers comprises at least first and second interlaces and the second portion of the plurality of subcarriers comprises at least a third interlace.

87. The at least one processor as defined in claim 86, wherein the pilot information is scrambled in the first interlace with a wide area identifier and is scrambled in the at least second interlaces with the wide area identifier and a local area identifier.

88. The at least one processor as defined in claim 86, wherein the transmitter identification information is encoded in at least the third interlace.

89. The at least one processor as defined in claim 85, wherein the symbol is a positioning pilot channel symbol.

90. The at least one processor as defined in claim 85, wherein the transmitter identification information includes at least one of a transmitter identification field, a transmitter allocation field, and cyclic redundancy check bits.

91. The at least one processor as defined in claim 90, wherein the transmitter allocation field is configured to communicate whether subsequent symbols including further data will be transmitted.

92. The at least one processor as defined in claim 85, the method further comprising:

transmitting transmitter allocation data within the transmitter identification information indicating the allocation of one or more subsequent symbols for a transmitter specific channel used to communicate further data.

93. The method as defined in claim 92, wherein a portion of the subcarriers in the one or more subsequent symbols data are used for the transmitter specific channel.

94. The at least one processor as defined in claim 85, wherein the encoding of transmitter identification information includes:

interleaving information bits of the transmitter identification information;

encoding the bits using a predetermined encoding scheme;

manipulating the encoded bits to ensure number of bits matches a predetermined modulation scheme;

modulating the bits according to the predetermined modulation scheme; and

mapping the modulated bits to subcarriers in the second portion of the plurality of subcarriers of the symbol.

95. The at least one processor as defined in claim 94, wherein the predetermined encoding scheme comprises Reed-Muller encoding.

96. The at least one processor as defined in claim 94, wherein manipulating the encoded bits includes puncturing one or more encoded bits and replacing the punctured encoded bits with zero values.

97. The at least one processor as defined in claim 94, wherein the predetermined modulation scheme comprises QPSK modulation.

98. The at least one processor as defined in claim 85, wherein the communication system comprises an OFDM communication system.

99. The at least one processor as defined in claim 98, wherein the OFDM communication system is operable in at least one of 1K, 2K, 4K, and 8K Fast Fourier Transform modes.

100. The at least one processor as defined in claim 98, wherein the ODFM system is one of a Forward Link Only (FLO) system and a DVB-T/H system.

101. The at least one processor as defined in claim 85, wherein the method further comprises adjusting a power level of at least one of the first and second portions of the plurality of subcarriers to ensure a power level of each transmitted symbol is maintained at a constant energy per symbol power level.

102. The at least one processor as defined in claim 101, wherein the first portion of the plurality of subcarriers comprises at least first and second interlaces and the second portion of the plurality of subcarriers comprises at least a third interlace and the power level of the third interlace is adjusted to a power level greater than a power level of the first and second interlaces, respectively.

103. The at least one processor as defined in claim 85, wherein the method further comprises:

transmitting in a third portion of subcarriers in symbol for an inactive transmitter; and

adjusting a power level of the third portion of subcarriers to ensure a power level of each transmitted symbol is maintained at a constant energy per symbol power level.

104. The at least one processor as defined in claim 85, wherein the pilot information and transmitter identification information are configured to be usable for positioning determination by a receiving device.

105. A method for determining transmitter identification information in a device in a communication system, the method comprising:

receiving at least one symbol having a plurality of subcarriers from a transmitter;

determining a channel estimate and an energy measurement of the at least one symbol from a transmitter using a first portion of the plurality of subcarriers in the at least one symbol; and

decoding a dedicated second portion of the plurality of subcarriers in the at least one symbol to determine the transmitter identification information.

106. The method as defined in claim 105, wherein receiving the at least one symbol comprises receiving the symbol over a pilot positioning channel.

107. The method as defined in claim 105, wherein decoding the transmitter identification information further comprises:

performing a Fast Fourier transform of samples of the second portion of the plurality of subcarriers to produce corresponding frequency domain samples;

determining a plurality of log likelihood ratio values from the frequency domain samples;

deinterleaving the plurality of log likelihood ratio values; and

decoding one more of the log likelihood ratio values according to a predetermined encoding scheme to determine bit values of the transmitter identification information.

108. The method as defined in claim 107, wherein the predetermined encoding scheme is Reed Muller encoding and decoding of the one or more log likelihood ratio values includes calculating a Fast Hadamard Transform of the one or more log likelihood ratio values.

109. The method as defined in claim 105, wherein determining the channel estimate further comprises:

decoding a portion of the first portion of subcarriers to determine a wide area identifier value;

decoding another portion of the first portion of subcarriers using the wide area identifier value to determine a local area identifier value; and

descrambling samples from the first portion of subcarriers using the determined wide area and local area identifiers.

110. The method as defined in claim 105, wherein the communication system comprises an OFDM communication system.

111. The method as defined in claim 110, wherein the OFDM communication system is operable in at least one of 1K, 2K, 4K, and 8K Fast Fourier Transform modes.

112. The method as defined in claim 110, wherein the ODFM system is one of a Forward Link Only FLO system and a DVB-T/H system.

113. The method as defined in claim 105, further comprising calculating receiving device position based on a plurality of received active symbols from a respective plurality of transmitters, associated transmitter identification information, and associated channel estimates.

114. An apparatus for determining transmitter identification information in a device in a communication system, the apparatus comprising:

means for receiving at least one symbol having a plurality of subcarriers from a transmitter;

means for determining a channel estimate and an energy measurement of the at least one symbol from a transmitter using a first portion of the plurality of subcarriers in the at least one symbol; and

means for decoding a dedicated second portion of the plurality of subcarriers in the at least one symbol to determine the transmitter identification information.

115. The apparatus as defined in claim 114, wherein means for receiving includes means for receiving the at least one symbol over a pilot positioning channel.

116. The apparatus as defined in claim 114, wherein the means for decoding the transmitter identification information further comprises:

means for performing a Fast Fourier transform of samples of the second portion of the plurality of subcarriers to produce corresponding frequency domain samples;

means for determining a plurality of log likelihood ratio values from the frequency domain samples;

means for deinterleaving the plurality of log likelihood ratio values; and

means for decoding one more of the log likelihood ratio values according to a predetermined encoding scheme to determine bit values of the transmitter identification information.

117. The apparatus as defined in claim 116, wherein the predetermined encoding scheme is Reed Muller encoding and decoding of the one or more log likelihood ratio values includes calculating a Fast Hadamard Transform of the one or more log likelihood ratio values.

118. The apparatus as defined in claim 114, wherein the means for determining the channel estimate further comprises:

means decoding a portion of the first portion of subcarriers to determine a wide area identifier value;

means for decoding another portion of the first portion of subcarriers using the wide area identifier value to determine a local area identifier value; and

means for descrambling samples from the first portion of subcarriers using the determined wide area and local area identifiers.

119. The apparatus as defined in claim 114, wherein the communication system comprises an OFDM communication system.

120. The apparatus as defined in claim 114, wherein the OFDM communication system is operable in at least one of 1K, 2K, 4K, and 8K Fast Fourier Transform modes.

121. The apparatus as defined in claim 114, wherein the ODFM system is one of a Forward Link Only FLO system and a DVB-T/H system.

122. The apparatus as defined in claim 114, further comprising calculating receiving device position based on a plurality of received active symbols from a respective plurality of transmitters, associated transmitter identification information, and associated channel estimates.

123. A computer program product, comprising:

computer-readable medium comprising;

code for causing a computer to receive at least one symbol having a plurality of subcarriers from a transmitter;

code for causing a computer to determine a channel estimate and an energy measurement of the at least one symbol from a transmitter using a first portion of the plurality of subcarriers in the at least one symbol; and

code for causing a computer to decode a dedicated second portion of the plurality of subcarriers in the at least one symbol to determine the transmitter identification information.

124. The computer program product as defined in claim 123, wherein the computer readable medium further includes code for causing a computer to receive the at least one symbol comprises receiving the symbol over a pilot positioning channel.

125. The computer program product as defined in claim 123, wherein the computer readable medium including code for causing a computer to decode the transmitter identification information further comprises:

code for causing a computer to perform a Fast Fourier transform of samples of the second portion of the plurality of subcarriers to produce corresponding frequency domain samples;

code for causing a computer to determine a plurality of log likelihood ratio values from the frequency domain samples;

code for causing a computer to deinterleave the plurality of log likelihood ratio values; and

code for causing a computer to decode one more of the log likelihood ratio values according to a predetermined encoding scheme to determine bit values of the transmitter identification information.

126. The computer program product as defined in claim 125, wherein the predetermined encoding scheme is Reed Muller encoding and decoding of the one or more log likelihood ratio values includes calculating a Fast Hadamard Transform of the one or more log likelihood ratio values.

127. The computer program product as defined in claim 123, wherein the code for causing a computer to determine the channel estimate further comprises:

code for causing a computer to decode a portion of the first portion of subcarriers to determine a wide area identifier value;

code for causing a computer to decode another portion of the first portion of subcarriers using the wide area identifier value to determine a local area identifier value; and

code for causing a computer to descramble samples from the first portion of subcarriers using the determined wide area and local area identifiers.

128. The computer program product as defined in claim 123, wherein the communication system comprises an OFDM communication system.

129. The computer program product as defined in claim 128 wherein the OFDM communication system is operable in at least one of 1K, 2K, 4K, and 8K Fast Fourier Transform modes.

130. The computer program product as defined in claim 128, wherein the ODFM system is one of a Forward Link Only FLO system and a DVB-T/H system.

131. The computer program product as defined in claim 123, wherein the computer readable medium further comprises code for causing a computer to calculate a receiving device position based on a plurality of received active symbols from a respective plurality of transmitters, associated transmitter identification information, and associated channel estimates.