Granted Patent B2

US 7,751,309 · App. 12/062,758 · Granted Jul 6, 2010

Abstract

Claims (57)

1. A method of estimating a Wide-area Identification Channel (WIC) and a Local-area Identification Channel (LIC) in a MediaFLO™ (Forward Link Only) mobile multimedia multicast system comprising a receiver, a transmitter, and a transmission channel, said method comprising:

receiving a wireless data signal comprising a MediaFLO™ mobile multimedia multicast system superframe comprising WIC and LIC symbols;

setting a first sparseness index value of said digital signal to zero;

setting a local copy WIC and LIC number of said digital signal to one;

generating a local copy of all possible values of said WIC and LIC symbols corresponding to a Wide-area Differentiator (WID) and Local-area Differentiator (LID) value from zero to fifteen;

dividing the received WIC and LIC symbol values by a local copy WIC and LIC value corresponding to WIC and LIC number one;

performing an Inverse Fast Fourier Transform (IFFT) of all said possible values of said WIC and LIC symbols;

calculating a second sparseness index value of the IFFT of sixteen possible values of said WIC and LIC symbols; and

extracting a WIC and LIC symbol from said digital signal corresponding to said second sparseness index.

2. The method of claim 1 , further comprising:

confirming that said second sparseness index is greater than said first sparseness index;

setting said first sparseness index equal to said second sparseness index upon confirmation that said second sparseness index is greater than said first sparseness index; and

confirming that said local copy WIC and LIC number equals fifteen.

3. The method of claim 2 , further comprising:

adding one to said local copy WIC and LIC number to generate a new local copy WIC and LIC value when said local copy WIC and LIC number does not equal fifteen; and

setting said local copy WIC and LIC value equal to said new local copy WIC and LIC value.

4. The method of claim 1 , further comprising using the extracted WIC and LIC symbol as an estimate of said transmission channel in a time domain.

5. The method of claim 1 , wherein said dividing of the received WIC and LIC symbols by said local copy WIC and LIC value results in an estimate of said transmission channel in a frequency domain.

6. The method of claim 1 , wherein said all possible values of said WIC and LIC symbols equals sixteen.

7. The method of claim 1 , further comprising correcting a coarse carrier frequency offset of each of the received WIC and LIC symbols prior to performing the dividing process.

8. A non-transitory program storage device readable by computer, tangibly embodying a program of instructions executable by said computer to perform a method of estimating a Wide-area Identification Channel (WIC) and a Local-area Identification Channel (LIC) in a MediaFLO™ (Forward Link Only) mobile multimedia multicast system comprising a receiver, a transmitter, and a transmission channel, said method comprising:

receiving a wireless data signal comprising a MediaFLO mobile multimedia multicast system superframe comprising WIC and LIC symbols;

setting a first sparseness index value of said digital signal to zero; setting a local copy WIC and LIC number of said digital signal to one; generating a local copy of all possible values of said WIC and LIC symbols corresponding to a Wide-area Differentiator (WID) and Local-area Differentiator (LID) value from zero to fifteen;

dividing the received WIC and LIC symbol values by a local copy WIC and LIC value corresponding to WIC and LIC number one;

performing an Inverse Fast Fourier Transform (IFFT) of all said possible values of said WIC and LIC symbols;

calculating a second sparseness index value of the IFFT of sixteen possible values of said WIC and LIC symbols; and

extracting a WIC and LIC symbol from said digital signal corresponding to said second sparseness index.

9. The program storage device of claim 8 , wherein said method further comprises:

confirming that said second sparseness index is greater than said first sparseness index;

setting said first sparseness index equal to said second sparseness index upon confirmation that said second sparseness index is greater than said first sparseness index; and

confirming that said local copy WIC and LIC number equals fifteen.

10. The program storage device of claim 9 , wherein said method further comprises:

adding one to said local copy WIC and LIC number to generate a new local copy WIC and LIC value when said local copy WIC and LIC number does not equal fifteen; and

setting said local copy WIC and LIC value equal to said new local copy WIC and LIC value.

11. The program storage device of claim 8 , wherein said method further comprises using the extracted WIC and LIC symbol as an estimate of said transmission channel in a time domain.

12. The program storage device of claim 8 , wherein said dividing of the received WIC and LIC symbols by said local copy WIC and LIC value results in an estimate of said transmission channel in a frequency domain.

13. The program storage device of claim 8 , wherein said all possible values of said WIC and LIC symbols equals sixteen.

14. The program storage device of claim 8 , wherein said method further comprises correcting a coarse carrier frequency offset of each of the received WIC and LIC symbols prior to performing the dividing process.

15. An apparatus for estimating a Wide-area Identification Channel (WIC) and a Local-area Identification Channel (LIC) in a MediaFLO™ (Forward Link Only) mobile multimedia multicast system comprising a receiver, a transmitter, and a transmission channel, said apparatus comprising a processor adapted to:

receive a wireless data signal comprising a MediaFLO™ mobile multimedia multicast system superframe comprising WIC and LIC symbols;

set a first sparseness index value of said digital signal to zero;

set a local copy WIC and LIC number of said digital signal to one;

generate a local copy of all possible values of said WIC and LIC symbols corresponding to a Wide-area Differentiator (WID) and Local-area Differentiator (LID) value from zero to fifteen;

divide the received WIC and LIC symbol values by a local copy WIC and LIC value corresponding to WIC and LIC number one;

perform an Inverse Fast Fourier Transform (IFFT) of all said possible values of said WIC and LIC symbols;

calculate a second sparseness index value of the IFFT of sixteen possible values of said WIC and LIC symbols; and

extract a WIC and LIC symbol from said digital signal corresponding to said second sparseness index.

16. The apparatus of claim 15 , wherein said processor is further adapted to:

confirm that said second sparseness index is greater than said first sparseness index;

set said first sparseness index equal to said second sparseness index upon confirmation that said second sparseness index is greater than said first sparseness index; and

confirm that said local copy WIC and LIC number equals fifteen.

17. The apparatus of claim 16 , wherein said processor is further adapted to:

add one to said local copy WIC and LIC number to generate a new local copy WIC and LIC value when said local copy WIC and LIC number does not equal fifteen; and

set said local copy WIC and LIC value equal to said new local copy WIC and LIC value.

18. The apparatus of claim 15 , wherein said processor is further adapted to use the extracted WIC and LIC symbol as an estimate of said transmission channel in a time domain.

19. The apparatus of claim 15 , wherein the dividing of the received WIC and LIC symbols by said local copy WIC and LIC value results in an estimate of said transmission channel in a frequency domain.

20. The apparatus of claim 15 , wherein said processor is further adapted to correct a coarse carrier frequency offset of each of the received WIC and LIC symbols prior to performing the dividing process, wherein said all possible values of said WIC and LIC symbols equals sixteen.

Assignments (31)