Method and apparatus for formatting signals for digital audio broadcasting transmission and reception
A method for digital audio broadcasting comprising the steps of receiving a plurality of data bits to be transmitted, formatting the plurality of data bits into a plurality of protocol data units, inserting header bits at spaced locations within the protocol data units, and using the protocol data units to modulate a plurality of carriers to produce an output signal. The individual header bits can be positioned at evenly spaced locations in the protocol data units. A first one of the header bits can be offset from an end of the protocol data unit. A method of receiving the digital audio broadcasting signal the transmitters and receivers that operate in accordance with the methods are also provided.
1. A method for digital audio broadcasting comprising the steps of:
receiving a plurality of data bits to be transmitted;
formatting the plurality of data bits into payloads of a plurality of protocol data units;
inserting header bits at spaced locations within the payloads of the protocol data units; and
using the protocol data units to modulate a plurality of carriers to produce an output signal;
wherein a first one of the header bits is offset from an end of the protocol data units.
2. The method of claim 1 , wherein:
individual ones of the header bits are positioned at evenly spaced locations in the payloads of the protocol data units.
3. The method of claim 1 , further comprising the step of:
scrambling the plurality of data bits by generating a pseudorandom code and modulo-2 adding the pseudorandom code and the data bits.
4. The method of claim 1 , further comprising the steps of:
interleaving the plurality of data bits;
assigning the interleaved bits to interleaver partitions; and
mapping the interleaver partitions to frequency partitions.
5. A method for digital audio broadcasting comprising the steps of:
receiving a plurality of data bits to be transmitted;
formatting the plurality of data bits into payloads of a plurality of protocol data units;
inserting header bits at spaced locations within the payloads of the protocol data units; and
using the protocol data units to modulate a plurality of carriers to produce an output signal;
wherein the header bits comprise one of the following bit sequences:
[110010110001101100011100]
[001011000110110001110011]
[001100101100011011000111]
[110011001011000110110001]
[011100110010110001101100]
[101100011100110010110001]
[000111001100101100011011]
[110001110011001011000110].
6. A method for digital audio broadcasting comprising the steps of:
receiving a plurality of data bits to be transmitted;
formatting the plurality of data bits into payloads of a plurality of protocol data units;
inserting header bits at spaced locations within the payloads of the protocol data units; and
using the protocol data units to modulate a plurality of carriers to produce an output signal;
wherein the protocol data units are processed in a plurality of logical channels and each logical channel is scrambled and encoded separately.
7. The method of claim 6 , wherein the logical channels operate at different rates depending upon a service mode.
8. The method of claim 6 , wherein each logical channel is scrambled using a maximal-length scrambling sequence using a linear feedback shift register with a primitive polynomial.
9. A transmitter for digital audio broadcasting comprising:
means for receiving a plurality of data bits to be transmitted;
means for formatting the plurality of data bits into payloads of a plurality of protocol data units;
means for inserting header bits at spaced locations within the payloads of the protocol data units; and
means for using the protocol data units to modulate a plurality of carriers to produce an output signal;
wherein a first one of the header bits is offset from an end of the protocol data units.
10. The transmitter of claim 9 , wherein:
individual ones of the header bits are positioned at evenly spaced locations in the payloads of the protocol data units.
11. The transmitter of claim 9 , further comprising:
means for scrambling the plurality of data bits by generating a pseudorandom code and modulo-2 adding the pseudorandom code and the data bits.
12. The transmitter of claim 9 , further comprising:
means for interleaving the plurality of data bits, assigning the interleaved bits to interleaver partitions, and mapping the interleaver partitions to frequency partitions.
13. A transmitter for digital audio broadcasting comprising:
means for receiving a plurality of data bits to be transmitted;
means for formatting the plurality of data bits into payloads of a plurality of protocol data units;
means for inserting header bits at spaced locations within the payloads of the protocol data units; and
means for using the protocol data units to modulate a plurality of carriers to produce an output signal;
wherein the header bits comprise one of the following bit sequences:
[110010110001101100011100]
[001011000110110001110011]
[001100101100011011000111]
[110011001011000110110001]
[011100110010110001101100]
[101100011100110010110001]
[000111001100101100011011]
[110001110011001011000110].
14. A transmitter for digital audio broadcasting comprising:
means for receiving a plurality of data bits to be transmitted;
means for formatting the plurality of data bits into payloads of a plurality of protocol data units;
means for inserting header bits at spaced locations within the payloads of the protocol data units; and
means for using the protocol data units to modulate a plurality of carriers to produce an output signal;
wherein the protocol data units are processed in a plurality of logical channels and each logical channel is scrambled and encoded separately.
15. The transmitter of claim 14 , wherein the logical channels operate at different rates depending upon a service mode.
16. The transmitter of claim 14 , wherein each logical channel is scrambled using a maximal-length scrambling sequence using a linear feedback shift register with a primitive polynomial.
17. A method for receiving a digital audio broadcasting signal, the method comprising the steps of:
receiving a digital audio broadcasting signal comprising a plurality of carriers modulated by a plurality of protocol data units, each of the plurality of protocol data units comprising a payload, the payload comprising a plurality of data bits and a plurality of header bits at spaced locations within the payload; and
producing an output signal in response to the digital audio broadcasting signal;
wherein a first one of the header bits is offset from an end of the protocol data units.
18. The method of claim 17 , wherein:
individual ones of the header bits are positioned at evenly spaced locations in the payloads of the protocol data units.
19. The method of claim 17 , wherein the plurality of data bits are scrambled by generating a pseudorandom code and modulo-2 adding the pseudorandom code and the data bits.
20. The method of claim 17 , wherein the plurality of data bits are interleaved; assigned to interleaver partitions; and the interleaver partitions are mapped to frequency partitions.
21. A method for receiving a digital audio broadcasting signal, the method comprising the steps of:
receiving a digital audio broadcasting signal comprising a plurality of carriers modulated by a plurality of protocol data units, each of the plurality of protocol data units comprising a payload, the payload comprising a plurality of data bits and a plurality of header bits at spaced locations within the payload; and
producing an output signal in response to the digital audio broadcasting signal;
wherein the header bits comprise one of the following bit sequences:
[110010110001101100011100]
[001011000110110001110011]
[001100101100011011000111]
[110011001011000110110001]
[011100110010110001101100]
[101100011100110010110001]
[000111001100101100011011]
[110001110011001011000110].
22. A method for receiving a digital audio broadcasting signal, the method comprising the steps of:
receiving a digital audio broadcasting signal comprising a plurality of carriers modulated by a plurality of protocol data units, each of the plurality of protocol data units comprising a payload, the payload comprising a plurality of data bits and a plurality of header bits at spaced locations within the payload; and
producing an output signal in response to the digital audio broadcasting signal;
wherein the protocol data units are arranged in a plurality of logical channels and each logical channel is scrambled and encoded separately.
23. The method of claim 22 , wherein the logical channels operate at different rates depending upon a service mode.
24. The method of claim 22 , wherein each logical channel is scrambled using a maximal-length scrambling sequence using a linear feedback shift register with a primitive polynomial.
25. A receiver for receiving a digital audio broadcasting signal, the receiver comprising:
means for receiving a digital audio broadcasting signal comprising a plurality of carriers modulated by a plurality of protocol data units, each of the plurality of protocol data units comprising a payload, the payload comprising a plurality of data bits and a plurality of header bits at spaced locations within the payload; and
means for producing an output signal in response to the digital audio broadcasting signal;
wherein a first one of the header bits is offset from an end of the protocol data units.
26. The receiver of claim 25 , wherein:
individual ones of the header bits are positioned at evenly spaced locations in the payloads of the protocol data units.
27. The receiver of claim 25 , wherein the plurality of data bits are scrambled by generating a pseudorandom code and modulo-2 adding the pseudorandom code and the data bits.
28. The receiver of claim 25 , wherein the plurality of data bits are interleaved; assigned to interleaver partitions; and the interleaver partitions are mapped to frequency partitions.
29. A receiver for receiving a digital audio broadcasting signal, the receiver comprising:
means for receiving a digital audio broadcasting signal comprising a plurality of carriers modulated by a plurality of protocol data units, each of the plurality of protocol data units comprising a payload, the payload comprising a plurality of data bits and a plurality of header bits at spaced locations within the payload; and
means for producing an output signal in response to the digital audio broadcasting signal;
wherein the header bits comprise one of the following bit sequences:
[110010110001101100011100]
[001011000110110001110011]
[001100101100011011000111]
[110011001011000110110001]
[011100110010110001101100]
[101100011100110010110001]
[000111001100101100011011]
[110001110011001011000110].
30. A receiver for receiving a digital audio broadcasting signal, the receiver comprising:
means for receiving a digital audio broadcasting signal comprising a plurality of carriers modulated by a plurality of protocol data units, each of the plurality of protocol data units comprising a payload, the payload comprising a plurality of data bits and a plurality of header bits at spaced locations within the payload; and
means for producing an output signal in response to the digital audio broadcasting signal;
wherein the protocol data units are arranged in a plurality of logical channels and each logical channel is scrambled and encoded separately.
31. The receiver of claim 30 , wherein the logical channels operate at different rates depending upon a service mode.
32. The receiver of claim 30 , wherein each logical channel is scrambled using a maximal-length scrambling sequence using a linear feedback shift register with a primitive polynomial.
33. A transmitter for digital audio broadcasting comprising:
an input for receiving a plurality of data bits to be transmitted;
a processor for formatting the plurality of data bits into payloads of a plurality of protocol data units, and for inserting header bits at spaced locations within the payloads of the protocol data units; and
a modulator for using the protocol data units to modulate a plurality of carriers to produce an output signal;
wherein a first one of the header bits is offset from an end of the protocol data units.
34. The transmitter of claim 33 , wherein:
individual ones of the header bits are positioned at evenly spaced locations in the payloads of the protocol data units.
35. The transmitter of claim 33 , further comprising:
a scrambler for scrambling the plurality of data bits by generating a pseudorandom code and modulo-2 adding the pseudorandom code and the data bits.
36. The transmitter of claim 33 , further comprising:
an interleaver for interleaving the plurality of data bits, assigning the interleaved bits to interleaver partitions, and mapping the interleaver partitions to frequency partitions.
37. A transmitter for digital audio broadcasting comprising:
an input for receiving a plurality of data bits to be transmitted;
a processor for formatting the plurality of data bits into payloads of a plurality of protocol data units, and for inserting header bits at spaced locations within the payloads of the protocol data units; and
a modulator for using the protocol data units to modulate a plurality of carriers to produce an output signal;
wherein the header bits comprise one of the following bit sequences:
[110010110001101100011100]
[001011000110110001110011]
[001100101100011011000111]
[110011001011000110110001]
[011100110010110001101100]
[101100011100110010110001]
[000111001100101100011011]
[110001110011001011000110].
38. A transmitter for digital audio broadcasting comprising:
an input for receiving a plurality of data bits to be transmitted;
a processor for formatting the plurality of data bits into payloads of a plurality of protocol data units, and for inserting header bits at spaced locations within the payloads of the protocol data units; and
a modulator for using the protocol data units to modulate a plurality of carriers to produce an output signal;
wherein the protocol data units are processed in a plurality of logical channels and each logical channel is scrambled and encoded separately.
39. The transmitter of claim 38 , wherein the logical channels operate at different rates depending upon a service mode.
40. The transmitter of claim 38 , wherein each logical channel is scrambled using a maximal-length scrambling sequence using a linear feedback shift register with a primitive polynomial.
41. A receiver for receiving a digital audio broadcasting signal, the receiver comprising:
an input for receiving a digital audio broadcasting signal comprising a plurality of carriers modulated by a plurality of protocol data units, each of the plurality of protocol data units comprising a payload, the payload comprising a plurality of data bits and a plurality of header bits at spaced locations within the payload; and
an output for producing an output signal in response to the digital audio broadcasting signal;
wherein a first one of the header bits is offset from an end of the protocol data units.
42. The receiver of claim 41 , wherein:
individual ones of the header bits are positioned at evenly spaced locations in the payload of the protocol data units.
43. The receiver of claim 41 , wherein the plurality of data bits are scrambled by generating a pseudorandom code and modulo-2 adding the pseudorandom code and the data bits.
44. The receiver of claim 41 , wherein the plurality of data bits are interleaved; assigned to interleaver partitions; and the interleaver partitions are mapped to frequency partitions.
45. A receiver for receiving a digital audio broadcasting signal, the receiver comprising:
an input for receiving a digital audio broadcasting signal comprising a plurality of carriers modulated by a plurality of protocol data units, each of the plurality of protocol data units comprising a payload, the payload comprising a plurality of data bits and a plurality of header bits at spaced locations within the payload; and
an output for producing an output signal in response to the digital audio broadcasting signal;
wherein the header bits comprise one of the following bit sequences:
[110010110001101100011100]
[001011000110110001110011]
[001100101100011011000111]
[110011001011000110110001]
[011100110010110001101100]
[101100011100110010110001]
[000111001100101100011011]
[110001110011001011000110].
46. A receiver for receiving a digital audio broadcasting signal, the receiver comprising:
an input for receiving a digital audio broadcasting signal comprising a plurality of carriers modulated by a plurality of protocol data units, each of the plurality of protocol data units comprising a payload, the payload comprising a plurality of data bits and a plurality of header bits at spaced locations within the payload; and
an output for producing an output signal in response to the digital audio broadcasting signal;
wherein the protocol data units are arranged in a plurality of logical channels and each logical channel is scrambled and encoded separately.
47. The receiver of claim 46 , wherein the logical channels operate at different rates depending upon a service mode.
48. The receiver of claim 46 , wherein each logical channel is scrambled using a maximal-length scrambling sequence using a linear feedback shift register with a primitive polynomial.