Data compression apparatus
View Patent ↗Provided is a data compression apparatus. The data compression apparatus includes a header information extraction extracting block header information on compressed data from I/Q data block generated by dividing data on a block basis, a block scaling unit generating an I/Q data scaling block by performing block scaling on the I/Q data block based on the block header information, and a compressed data generation unit generating compressed data by using a block header based on the block header information and the I/Q data scaling block.
1. A data compression apparatus, comprising:
a data storage device configured to store received in-phase (I) data and quadrature (Q) data, and divide and output each of stored I data and Q data on a block basis; and
a processor configured to
extract block header information using a maximum value obtained from an I data block and a Q data block generated by dividing the I data and Q data on the block basis and padding data,
scale an I data scaling block and Q data scaling block obtained by performing block-scaling on the I data block and the Q data block using the block header information, and
generate compressed data using a block header based on the block header information, the I data scaling block, and the Q data scaling block.
2. The data compression apparatus of claim 1 , wherein the processor is further configured to
determine a maximum among absolute values of samples in the I data block and the Q data block, and
generate the block header information from the maximum value using a number of bits of the padding data.
3. The data compression apparatus of claim 2 , wherein the block header information is determined according to:
G
(
k
)
=
⌊
A
(
k
)
2
Qd
⌋
where G(k) denotes the block header information, A(k) denotes the maximum value, and Q d denotes the number of bits of the padding data.
4. The data compression apparatus of claim 3 , wherein the number of bits of the padding data is obtained by subtracting a number of bits allocated to the block header and one from a maximum number of bits usable for the I data block and the Q data block.
5. The data compression apparatus of claim 3 , wherein the processor is further configured to
determine a block scaling value for scaling of the I data block and the Q data block using the block header information, and
operate the I data block and Q data block with the block scaling value to generate the I data scaling block and Q data scaling block.
6. The data compression apparatus of claim 4 , wherein the block scaling value is determined according to:
2
-
1
-
1
2
Qd
(
G
(
k
)
+
1
)
-
1
where Q q denotes a number of bits to be allocated to samples after the block scaling.
7. The data compression apparatus of claim 1 , wherein the block header information is determined based on a quantity raised to a power of a number of bits of the padding data.
8. A data compression apparatus, comprising:
a first storage device configured to store I data, and divide and output stored I data on a block basis;
a second storage device configured to store Q data, and divide and output stored Q data on a block basis; and
a processor configured to
divide received data into the I data and the Q data,
extract first block header information using a first maximum value obtained from the I data block generated by dividing the I data on the block basis and first padding data,
generate an I data scaling block obtained by performing block scaling on the I data block using the first block header information,
extract second block header information using a second maximum value obtained from the Q data block generated by dividing the Q data on the block basis and second padding data,
generate a Q data scaling block obtained by performing block scaling on the Q data block using the second block header information, and
generate compressed data using the I block header corresponding to the first block header information, the Q block header corresponding to the second block header information, the I data scaling block and the Q data scaling block.
9. The data compression apparatus of claim 8 , wherein the processor is further configured to
determine a first maximum value among absolute values of samples in the I data block, and
generate the first block header information using the first maximum value and a number of bits of the first padding data.
10. The data compression apparatus of claim 9 , wherein the first block header information is generated according to:
G
I
(
k
)
=
⌊
A
I
(
k
)
2
Qdi
⌋
where G I ( k ) denotes the first block header information, A I (k) denotes the first maximum value, and Q di denotes the number of bits of the first padding data.
11. The data compression apparatus of claim 10 , wherein the number of bits of the first padding data is obtained by subtracting a number of bits allocated to the first block header and one from a maximum number of bits usable for the I data block.
12. The data compression apparatus of claim 10 , wherein the processor is further configured to
determine a first block scaling value for scaling of the I data block based on the first block header information, and
generate the I data scaling block by operating the I data block with the first block scaling value.
13. The data compression apparatus of claim 12 , wherein the first block scaling value is determined according to:
2
-
1
-
1
2
Qdi
(
G
I
(
k
)
+
1
)
-
1
where Q q denotes a number of bits to be allocated to samples after the block scaling.
14. The data compression apparatus of claim 8 , wherein the processor is further configured to
determine the second maximum value among absolute values of samples in the Q data block, and
generate the second block header information using the second maximum value and a number of bits of the second padding data.
15. The data compression apparatus of claim 14 , wherein the second block header information is generated according to:
G
Q
(
k
)
=
⌊
A
Q
(
k
)
2
Qdq
⌋
where G Q (k) denotes the second block header information, A Q (k) denotes the second maximum value, and Q dq denotes the number of bits of the second padding data.
16. The data compression apparatus of claim 15 , wherein the number of bits of the second padding data is obtained by subtracting a number of bits allocated to the second block header and one from a maximum number of bits usable for the Q data block.
17. The data compression apparatus of claim 15 , wherein the processor is further configured to
determine a second block scaling value for scaling of the Q data block based on the second block header information, and
generate the Q data scaling block by operating the Q data block the second block scaling value.
18. The data compression apparatus of claim 17 , wherein the second block scaling value is determined according to:
2
-
1
-
1
2
Qdq
(
G
Q
(
k
)
+
1
)
-
1
where Q q denotes a number of bits to be allocated to samples after the block scaling.
19. A method of data compression, the method comprising:
storing received in-phase (I) data and quadrature (Q) data, and dividing and outputting each of stored I data and Q data on a block basis;
extracting block header information using a maximum value obtained from an I data block and a Q data block generated by dividing the I data and the Q data on the block basis and padding data;
scaling an I data scaling block and a Q data scaling block obtained by performing block-scaling on the I data block and the Q data block based on the block header information;
generating compressed data using a block header based on the block header information, the I data scaling block, and the Q data scaling block;
determining a maximum among absolute values of samples in the I data block and Q data block; and
generating the block header information from the maximum value using a number of bits of the padding data,
wherein the block header information is determined according to:
G
(
k
)
=
⌊
A
(
k
)
2
Qd
⌋
where G(k) denotes the block header information, A(k) denotes the maximum value, and Q d denotes the number of bits of the padding data.