Spread-spectrum coding of data bursts
Certain aspects of the present disclosure relate to a method for generating spread-spectrum coded signals for transmission in a wireless communication system, and particularly for generating spread sequences of data with spreading codes that facilitate computationally efficient frequency-domain processing at a receiver.
1. A method for wireless communications, comprising:
partitioning a data stream into sub-blocks of data;
spreading each sub-block using a matrix with M orthogonal rows, wherein the spreading comprises repeating each sub-block M times and applying each row of the matrix to one of the repeated sub-blocks to generate a spread data stream; and
transmitting the spread data stream.
2. The method of claim 1 , wherein applying each row of the matrix to one of the repeated sub-blocks comprises multiplying the sub-block element by element with the row of the matrix repeated N/M times, where N is a length of the sub-block.
3. The method of claim 1 , wherein the matrix is a Hadamard matrix.
4. The method of claim 3 , wherein the Hadamard matrix has two rows and two columns.
5. The method of claim 3 , wherein the Hadamard matrix has four rows and four columns.
6. An apparatus for wireless communications, comprising:
a circuit configured to partition a data stream into sub-blocks of data;
a spreader configured to spread each sub-block using a matrix with M orthogonal rows, wherein the spreader comprises a circuit configured to repeat each sub-block M times and a circuit configured to apply each row of the matrix to one of the repeated sub-blocks to generate a spread data stream; and
a transmitter configured to transmit the spread data stream.
7. The apparatus of claim 6 , wherein the circuit configured to apply each row of the matrix to one of the repeated sub-blocks comprises a multiplier configured to multiply the sub-block element by element with the row of the matrix repeated N/M times, where N is a length of the sub-block.
8. The apparatus of claim 6 , wherein the matrix is a Hadamard matrix.
9. The apparatus of claim 8 , wherein the Hadamard matrix has two rows and two columns.
10. The apparatus of claim 8 , wherein the Hadamard matrix has four rows and four columns.
11. An apparatus for wireless communications, comprising:
means for partitioning a data stream into sub-blocks of data;
means for spreading each sub-block using a matrix with M orthogonal rows, wherein the means for spreading comprises means for repeating each sub-block M times and means for applying each row of the matrix to one of the repeated sub-blocks to generate a spread data stream; and
means for transmitting the spread data stream.
12. The apparatus of claim 11 , wherein the means for applying each row of the matrix to one of the repeated sub-blocks comprises means for multiplying the sub-block element by element with the row of the matrix repeated N/M times, where N is a length of the sub-block.
13. The apparatus of claim 11 , wherein the matrix is a Hadamard matrix.
14. The apparatus of claim 13 , wherein the Hadamard matrix has two rows and two columns.
15. The apparatus of claim 13 , wherein the Hadamard matrix has four rows and four columns.
16. A computer-program product for wireless communications, comprising a computer-readable storage device encoded with instructions executable to:
partition a data stream into sub-blocks of data;
spread each sub-block using a matrix with M orthogonal rows, wherein the instructions executable to spread comprise instructions executable to repeat each sub-block M times and instructions executable to apply each row of the matrix to one of the repeated sub-blocks to generate a spread data stream; and
transmit the spread data stream.
17. An access point, comprising:
at least one antenna;
a circuit configured to partition a data stream into sub-blocks of data;
a spreader configured to spread each sub-block using a matrix with M orthogonal rows, wherein the spreader comprises a circuit configured to repeat each sub-block M times and a circuit configured to apply each row of the matrix to one of the repeated sub-blocks to generate a spread data stream; and
a transmitter configured to transmit via the at least one antenna the spread data stream.