Communication system for transmitting sync-flags and pilot symbols and method thereof
View Patent ↗The present invention relates to a communication system and method for transmitting sync flags and pilot symbols during sync symbol periods. Example embodiments provide a method for sharing sync symbols to communicate flag sequences and pilot sequences during a sequence of sync symbol periods. The method includes modulating the pilot sequence by multiplying a pilot code by each value of the pilot sequence, and modulating the flag sequence by multiplying a flag code by each value of the flag sequence. The pilot and flag codes are mutually orthogonal to each other and each includes at least two non-zero values. The method further includes generating a resulting sync symbol sequence based on the modulated pilot sequence and modulated flag sequence, and sending the resulting sync symbol sequence during the sync symbol period.
1. A method for sharing sync symbols to communicate flag sequences and pilot sequences during a sequence of sync symbol periods, the method comprising:
modulating the pilot sequence by multiplying a pilot code by each value of the pilot sequence to form an encoded pilot sequence;
modulating the flag sequence by multiplying a flag code by each value of the flag sequence to form an encoded flag sequence, the pilot and flag codes being mutually orthogonal to each other, the pilot and flag codes each including at least two non-zero values;
generating a resulting sync symbol sequence based on the encoded pilot sequence and encoded flag sequence such that each value of the encoded pilot sequence and each value of the encoded flag sequence affects more than one sync symbol in the resulting sync symbol sequence; and
sending the resulting sync symbol sequence during the sequence of sync symbol periods.
2. The method of claim 1 , wherein sending the resulting sync symbol sequence includes transforming each sync symbol of the resulting sync symbol sequence into a signal for transmission across a communication line.
3. The method of claim 1 , wherein generating the resulting sync symbol sequence includes adding the modulated pilot sequence and the modulated flag sequence.
4. The method of claim 1 , wherein the values of the flag and pilot codes are complex numbers.
5. The method of claim 1 , wherein each value of the pilot sequence and the flag sequence is one of two real or complex values.
6. The method of claim 1 , further comprising:
allocating sync symbol power between the pilot sequence and the flag sequence by adjusting a first and second parameters of the pilot and flag codes.
7. The method of claim 6 , wherein the flag code is (a, a) and the pilot code is (b, −b), wherein
a
=
α
2
(
1
+
j
)
,
b
=
β
2
(
1
-
j
)
,
α 2 +β 2 =1, and wherein α and β are the first and second parameters of the flag and pilot codes.
8. The method of claim 1 , wherein the pilot sequence is used for crosstalk estimation and flag sequence is used to send sync flags.
9. The method of claim 1 , wherein the resulting sync symbol sequence includes at least one pair of sync symbols, a sum of the at least one pair of sync symbols being a flag value of the flag sequence, and a difference between the at least one pair of sync symbols being a pilot value of the pilot sequence.
10. A communication system for sharing sync symbols to communicate flag sequences and pilot sequences during a sequence of sync symbol periods, the communication system comprising:
a first modulator configured to modulate the pilot sequence by multiplying a pilot code by each value of the pilot sequence to form an encoded pilot sequence;
a second code modulator configured to modulate the flag sequence by multiplying a flag code by each value of the flag sequence to form an encoded flag sequence, the pilot and flag codes being mutually orthogonal to each other, the pilot and flag codes including at least two non-zero values; and
a combiner configured to combine the encoded pilot sequence with the encoded flag sequence to generate a resulting sync symbol sequence such that each value of the encoded pilot sequence and each value of the encoded flag sequence affects more than one sync symbol in the resulting sync symbol sequence.
11. The communication system of claim 10 , further comprising:
a channel modulator configured to send the resulting sync symbol sequence by transforming each sync symbol of the resulting sync symbol sequence into a signal for transmission across a communication line.
12. The communication system of claim 10 , wherein the communication system is configured to allocate sync symbol power between the pilot sequence and the flag sequence by adjusting a first and second parameter of the pilot and flag codes.
13. The communication system of claim 12 , wherein the flag code is (a, a) and the pilot code is (b, −b), wherein
a
=
α
2
(
1
+
j
)
,
b
=
β
2
(
1
-
j
)
,
wherein α 2 +β 2 =1, and wherein α and β are the first and second parameters of the flag and pilot codes.
14. The communication system of claim 10 , wherein the pilot sequence is used for crosstalk estimation and flag sequence is used to send sync flags.
15. The communication system of claim 10 , wherein the values of the flag and pilot codes are complex numbers.
16. The communication system of claim 10 , wherein each value of the pilot sequence and flag sequence is one of two real or complex values.
17. The method of claim 10 , wherein the resulting sync symbol sequence includes at least one pair of sync symbols, a sum of the at least one pair of sync symbols being a flag value of the flag sequence, and a difference between the at least one pair of sync symbols being a pilot value of the pilot sequence.
18. A method for sharing sync symbols to communicate flag sequences and pilot sequences during a sequence of sync symbol periods, the method comprising:
modulating the pilot sequence by multiplying a pilot code by each value of the pilot sequence;
modulating the flag sequence by multiplying a flag code by each value of the flag sequence, the pilot and flag codes being mutually orthogonal to each other, the pilot and flag codes each including at least two non-zero values;
generating a resulting sync symbol sequence based on the modulated pilot sequence and modulated flag sequence; and
sending the resulting sync symbol sequence during the sequence of sync symbol periods, wherein the flag code is (a, a) and the pilot code is (b, −b), wherein
a
=
α
2
(
1
+
j
)
,
b
=
β
2
(
1
-
j
)
,
wherein α 2 +β 2 =1, and wherein α and β are the first and second parameters of the flag and pilot codes.
19. A communication system for sharing sync symbols to communicate flag sequences and pilot sequences during a sequence of sync symbol periods, the communication system comprising:
a first modulator configured to modulate the pilot sequence by multiplying a pilot code by each value of the pilot sequence;
a second code modulator configured to modulate the flag sequence by multiplying a flag code by each value of the flag sequence, the pilot and flag codes being mutually orthogonal to each other, the pilot and flag codes including at least two non-zero values; and
a combiner configured to combine the modulated pilot sequence with the modulated flag sequence to generate a resulting sync symbol sequence, wherein the flag code is (a, a) and the pilot code is (b, −b), wherein
a
=
α
2
(
1
+
j
)
,
b
=
β
2
(
1
-
j
)
,
wherein α 2 +β 2 =1, and wherein α and β are the first and second parameters of the flag and pilot codes.