Method and device for transmitting data using LDPC code
The present disclosure provides a method and a device for transmitting data using a LDPC code. The method for transmitting data using a LDPC code includes: determining a check code length according to a current LDPC code rate; informing a receiving end about the current LDPC code rate and the check code length, adding a check code with the check code length to data to be sent, and implementing a LDPC encoding using the current LDPC code rate, so as to obtain LDPC code data; and sending the LDPC code data to a receiving end. The method and the device of the present disclosure can improve spectrum effectiveness of transmitting data using LDPC code.
1. A method for transmitting data using a LDPC (Low Density Parity Check) code, being applied in a transmitting end and comprising:
determining a check code length according to a current LDPC code rate;
informing a receiving end about the current LDPC code rate and the check code length, adding a check code with the check code length to data to be sent, and implementing a LDPC encoding using the current LDPC code rate, so as to obtain LDPC code data; and
sending the LDPC code data to a receiving end.
2. The method for transmitting data using a LDPC code according to claim 1 , wherein determining a check code length according to a current LDPC code rate comprises:
deciding a value range of the current LDPC code rate; and
determining the check code length according to the value range.
3. The method for transmitting data using a LDPC code according to claim 2 , wherein the transmitting end is configured with M kinds of LDPC code rate; and a number of bit occupied by informing the receiving end about the current LDPC code rate and the check code length is ┌log 2 M ┐, where M is an integer greater than or equal to two.
4. The method for transmitting data using a LDPC code according to claim 1 , wherein determining the check code length according to the current LDPC code rate comprises:
deciding a value range of the current LDPC code rate; and
selecting the check code length from a length group corresponding to the value range.
5. The method for transmitting data using a LDPC code according to claim 1 , wherein the transmitting end is configured with M kinds of LDPC code rate; in a length group corresponding to a m th code rate, there are K m alternative check code lengths; and a number of bit occupied by informing the receiving end about the current LDPC code rate and the checkcode length is
⌈
log
2
M
⌉
+
⌈
∑
m
=
1
M
log
2
K
m
⌉
,
where M is an integer greater than or equal to two, and m is an integer between one and M.
6. The method for transmitting data using a LDPC code according claim 1 , wherein the check code is a cyclic redundancy check code.
7. The method for transmitting data using a LDPC code according claim 1 , wherein the current LDPC code rate is determined according to a channel state between the transmitting end and the receiving end.
8. A device for transmitting data using a LDPC (Low Density Parity Check) code, being applied in a transmitting end and comprising:
a check code length determining circuitry configured to determine a check code length according to a current LDPC code rate;
an informing circuitry configured to inform a receiving end about the current LDPC code rate and the check code length;
a data circuitry configured to add a check code with the check code length to data to be sent, and implement a LDPC encoding using the current LDPC code rate, so as to obtain LDPC code data; and
a sending circuitry configured to send the LDPC code data to a receiving end.
9. The device for transmitting data using a LDPC code according to claim 8 , wherein the check code length determining circuitry comprises:
a first range deciding sub-circuitry configured to decide a value range of the current LDPC code rate; and
a first determining sub-circuitry configured to determine the check code length according to the value range.
10. The device for transmitting data using a LDPC code according to claim 9 , wherein the transmitting end is configured with M kinds of LDPC code rate; and the informing circuitry uses ┌log 2 M ┐ bit to inform the receiving end, where M is an integer greater than or equal to two.
11. The device for transmitting data using a LDPC code according to claim 8 , wherein the check code length determining circuitry comprises:
a second deciding sub-circuitry configured to decide a value range of the current LDPC code rate; and
a second determining circuitry configured to select the check code length from a length group corresponding to the value range.
12. The device for transmitting data using a LDPC code according to claim 8 , wherein the transmitting end is configured with M kinds of LDPC code rate; in a length group corresponding to a m th code rate, there are K m alternative check code lengths; and the informing circuitry uses
⌈
log
2
M
⌉
+
⌈
∑
m
=
1
M
log
2
K
m
⌉
bit to inform the receiving end, where M is an integer greater than or equal to two, and m is an integer between one and M.
13. The device for transmitting data using a LDPC code according claim 8 , wherein the check code is a cyclic redundancy check code.
14. The device for transmitting data using a LDPC code according to claim 8 , wherein the current LDPC code rate is determined according to a channel state between the transmitting end and the receiving end.