# US 8,787,421 B2 · Transmitting spread signal in communication system

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- Number: US 8,787,421 B2
- Document ID: US8787421B2
- Status: Granted
- Kind: B2
- Application number: 14/030,747
- Filed: 2013-09-18
- Published: 2014-01-23
- Granted: 2014-07-22
- Earliest claimed: 2007-06-13
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Jung Hoon Lee; Ki Jun Kim; Dong Wook Roh; Daewon Lee; Joon Kui Ahn
- Web page: https://patentgrep.com/patent/US8787421B2

## CPC

- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04B 1/707: using direct sequence modulation
- H04B 7/0413: MIMO systems
- H04B 7/0678: {using different spreading codes between antennas (code allocation H04J13/16)}
- H04B 7/068: {using space frequency diversity (space-frequency coding H04L1/0606)}
- H04J 13/00: Code division multiplex systems (for frequency hopping H04B1/713)
- H04L 1/0606: {Space-frequency coding}
- H04L 5/0021: {in which codes are applied as a frequency-domain sequences, e.g. MC-CDMA}
- H04L 5/0023: {Time-frequency-space}
- H04L 5/0026: {Division using four or more dimensions, e.g. beam steering or quasi-co-location [QCL]}
- H04B 2201/709718: Determine interference
- H04J 13/16: Code allocation
- H04L 1/0643: {block codes}
- H04L 1/1621: {Group acknowledgement, i.e. the acknowledgement message defining a range of identifiers, e.g. of sequence numbers}
- H04L 1/1825: Adaptation of specific ARQ protocol parameters according to transmission conditions
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04B: TRANSMISSION
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)

## Abstract

A method for receiving Acknowledgement/Negative acknowledgement (ACK/NACK) information in a mobile communication system includes receiving a first signal including first spread ACK/NACK information and second spread ACK/NACK information from a first antenna set of a transmitting end in an orthogonal frequency division multiplexing (OFDM) symbol; receiving a second signal including third spread ACK/NACK information and fourth spread ACK/NACK information from a second antenna set of the transmitting end in an OFDM symbol; and de-spreading at least the first and third spread ACK/NACK information or the second and fourth spread ACK/NACK information for identifying the ACK/NACK information.

## Claims

### Claim 1

A method for communicating Acknowledgement/Negative acknowledgement (ACK/NACK) information in a mobile communication system, the method comprising:
transmitting, by a base station, a first signal including first spread ACK/NACK information and second spread ACK/NACK information on a first set of four available neighboring subcarriers in an orthogonal frequency division multiplexing (OFDM) symbol, wherein the first spread ACK/NACK information and the second spread ACK/NACK information are coded on the first set of four available neighboring subcarriers as shown in Table 1;
receiving, by a terminal, the first signal including the first spread ACK/NACK information and the second spread ACK/NACK information on the first set of four available neighboring subcarriers;
transmitting, by the base station, a second signal including third spread ACK/NACK information and fourth spread ACK/NACK information on a second set of four available neighboring subcarriers in an OFDM symbol, wherein the third spread ACK/NACK information and the fourth spread ACK/NACK information are coded on the second set of four available neighboring subcarriers as shown in Table 2; and
receiving, by the terminal, the second signal including the third spread ACK/NACK information and the fourth spread ACK/NACK information on the second set of four available neighboring subcarriers,
TABLE 1
First set of four available
neighboring subcarriers
in an OFDM symbol
antenna A
a1
a2
b1
b2
antenna B
−a2*
a1*
−b2*
b1*
antenna C
0
0
0
0
antenna D
0
0
0
0
TABLE 2
Second set of four available
neighboring subcarriers
in an OFDM symbol
antenna A
0
0
0
0
antenna B
0
0
0
0
antenna C
c1
c2
d1
d2
antenna D
−c2*
c1*
−d2*
d1*
wherein a1 to a2 are elements of the first spread ACK/NACK information, b1 to b2 are elements of the second spread ACK/NACK information, c1 to c2 are elements of the third spread ACK/NACK information, d1 to d2 are elements of the fourth ACK/NACK information, and the symbol * denotes a conjugate operation,
wherein the first spread ACK/NACK information and the third spread ACK/NACK information carry first ACK/NACK information,
wherein the second spread ACK/NACK information and the fourth spread ACK/NACK information carry second ACK/NACK information, and
wherein the first set of four available neighboring subcarriers is separated from the second set of four available neighboring subcarriers by a plurality of subcarriers in a frequency domain.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
de-spreading, by the terminal, either the first and third spread ACK/NACK information or the second and fourth ACK/NACK information for identifying ACK/NACK information allocated to the terminal.

### Claim 3 (depends on 1)

The method of claim 1, further comprising:
processing, by the terminal, the first signal based on a coding scheme of the first spread ACK/NACK information and the second spread ACK/NACK information; and
processing, by the terminal, the second signal based on a coding scheme of the third spread ACK/NACK information and the fourth spread ACK/NACK information.

### Claim 4 (depends on 1)

The method of claim 1, wherein the first set of four available neighboring subcarriers and the second set of four available neighboring subcarriers are on different OFDM symbols.

### Claim 5 (depends on 1)

The method of claim 1, further comprising:
transmitting, by the base station, a third signal including fifth spread ACK/NACK information and sixth spread ACK/NACK information on a third set of four available neighboring subcarriers in an OFDM symbol, wherein the fifth spread ACK/NACK information and the sixth spread ACK/NACK information are coded on the third set of four available neighboring subcarriers as shown in Table 3; and
receiving, by the terminal, the third signal including the fifth spread ACK/NACK information and the sixth spread ACK/NACK information on the third set of four available neighboring subcarriers:
TABLE 3
Third set of four available
neighboring subcarriers
in an OFDM symbol
antenna A
e1
e2
f1
f2
antenna B
−e2*
e1*
−f2*
f1*
antenna C
0
0
0
0
antenna D
0
0
0
0
wherein e1 to e2 are elements of the fifth spread ACK/NACK information, and f1 to f2 are elements of the sixth spread ACK/NACK information,
wherein the fifth spread ACK/NACK information carries the first ACK/NACK information, and the sixth spread ACK/NACK information carries the second ACK/NACK information, and
wherein the first set of four available neighboring subcarriers is separated from the third set of four available neighboring subcarriers by a plurality of subcarriers in the frequency domain.

### Claim 6

A method for receiving Acknowledgement/Negative acknowledgement (ACK/NACK) information in a mobile communication system, the method comprising:
receiving, by a terminal, a first signal including first spread ACK/NACK information and second spread ACK/NACK information on a first set of four available neighboring subcarriers in an orthogonal frequency division multiplexing (OFDM) symbol; and
receiving, by the terminal, a second signal including third spread ACK/NACK information and fourth spread ACK/NACK information on a second set of four available neighboring subcarriers in an OFDM symbol,
wherein the first spread ACK/NACK information and the second spread ACK/NACK information are coded on the first set of four available neighboring subcarriers as shown in Table 1,
wherein the third spread ACK/NACK information and the fourth spread ACK/NACK information are coded on the second set of four available neighboring subcarriers as shown in Table 2:
TABLE 1
First set of four available
neighboring subcarriers
in an OFDM symbol
antenna A
a1
a2
b1
b2
antenna B
−a2*
a1*
−b2*
b1*
antenna C
0
0
0
0
antenna D
0
0
0
0
TABLE 2
Second set of four
available neighboring
subcarriers in an
OFDM symbol
antenna A
0
0
0
0
antenna B
0
0
0
0
antenna C
c1
c2
d1
d2
antenna D
−c2*
c1*
−d2*
d1*
wherein a1 to a2 are elements of the first spread ACK/NACK information, b1 to b2 are elements of the second spread ACK/NACK information, c1 to c2 are elements of the third spread ACK/NACK information, d1 to d2 are elements of the fourth ACK/NACK information, and the symbol * denotes a conjugate operation,
wherein the first spread ACK/NACK information and the third spread ACK/NACK information carry first ACK/NACK information,
wherein the second spread ACK/NACK information and the fourth spread ACK/NACK information carry second ACK/NACK information, and
wherein the first set of four available neighboring subcarriers is separated from the second set of four available neighboring subcarriers by a plurality of subcarriers in a frequency domain.

### Claim 7 (depends on 6)

The method of claim 6, further comprising:
de-spreading, by the terminal, either the first and third spread ACK/NACK information or the second and fourth ACK/NACK information for identifying ACK/NACK information allocated to the terminal.

### Claim 8 (depends on 6)

The method of claim 6, further comprising:
processing, by the terminal, the first signal based on a coding scheme of the first spread ACK/NACK information and the second spread ACK/NACK information; and
processing, by the terminal, the second signal based on a coding scheme of the third spread ACK/NACK information and the fourth spread ACK/NACK information.

### Claim 9 (depends on 6)

The method of claim 6, wherein the first set of four available neighboring subcarriers and the second set of four available neighboring subcarriers are on different OFDM symbols.

### Claim 10 (depends on 6)

The method of claim 6, further comprising:
receiving, by the terminal, a third signal including fifth spread ACK/NACK information and sixth spread ACK/NACK information on a third set of four available neighboring subcarriers in an OFDM symbol,
wherein the fifth spread ACK/NACK information and the sixth spread ACK/NACK information are coded on the third set of four available neighboring subcarriers as shown in Table 3:
TABLE 3
Third set of four available
neighboring subcarriers
in an OFDM symbol
antenna A
e1
e2
f1
f2
antenna B
−e2*
e1*
−f2*
f1*
antenna C
0
0
0
0
antenna D
0
0
0
0
wherein e1 to e2 are elements of the fifth spread ACK/NACK information, f1 to f2 are elements of the sixth spread ACK/NACK information,
wherein the fifth spread ACK/NACK information carries the first ACK/NACK information, and the sixth spread ACK/NACK information carries the second ACK/NACK information, and
wherein the first set of four available neighboring subcarriers is separated from the third set of four available neighboring subcarriers by a plurality of subcarriers in the frequency domain.

### Claim 11

A mobile communication system including a base station and a terminal, wherein:
the base station is configured to transmit a first signal including first spread Acknowledgement/Negative acknowledgement (ACK/NACK) information and second spread ACK/NACK information on a first set of four available neighboring subcarriers in an orthogonal frequency division multiplexing (OFDM) symbol, wherein the first spread ACK/NACK information and the second spread ACK/NACK information are coded on the first set of four available neighboring subcarriers as shown in Table 1;
the terminal is configured to receive the first signal including the first spread ACK/NACK information and the second spread ACK/NACK information on the first set of four available neighboring subcarriers;
the base station is further configured to transmit a second signal including third spread ACK/NACK information and fourth spread ACK/NACK information on a second set of four available neighboring subcarriers in an OFDM symbol, wherein the third spread ACK/NACK information and the fourth spread ACK/NACK information are coded on the second set of four available neighboring subcarriers as shown in Table 2; and
the terminal is further configured to receive the second signal including the third spread ACK/NACK information and the fourth spread ACK/NACK information on the second set of four available neighboring subcarriers,
TABLE 1
First set of four available
neighboring subcarriers
in an OFDM symbol
antenna A
a1
a2
b1
b2
antenna B
−a2*
a1*
−b2*
b1*
antenna C
0
0
0
0
antenna D
0
0
0
0
TABLE 2
Second set of four
available neighboring
subcarriers in an
OFDM symbol
antenna A
0
0
0
0
antenna B
0
0
0
0
antenna C
c1
c2
d1
d2
antenna D
−c2*
c1*
−d2*
d1*
wherein a1 to a2 are elements of the first spread ACK/NACK information, b1 to b2 are elements of the second spread ACK/NACK information, c1 to c2 are elements of the third spread ACK/NACK information, d1 to d2 are elements of the fourth ACK/NACK information, and the symbol * denotes a conjugate operation,
wherein the first spread ACK/NACK information and the third spread ACK/NACK information carry first ACK/NACK information,
wherein the second spread ACK/NACK information and the fourth spread ACK/NACK information carry second ACK/NACK information, and
wherein the first set of four available neighboring subcarriers is separated from the second set of four available neighboring subcarriers by a plurality of subcarriers in a frequency domain.

### Claim 12 (depends on 11)

The mobile communication system of claim 11, wherein the terminal is further configured to de-spread either the first and third spread ACK/NACK information or the second and fourth ACK/NACK information for identifying ACK/NACK information allocated to the terminal.

### Claim 13 (depends on 11)

The mobile communication system of claim 11, wherein the terminal is further configured to:
process the first signal based on a coding scheme of the first spread ACK/NACK information and the second spread ACK/NACK information; and
process the second signal based on a coding scheme of the third spread ACK/NACK information and the fourth spread ACK/NACK information.

### Claim 14 (depends on 11)

The mobile communication system of claim 11, wherein the first set of four available neighboring subcarriers and the second set of four available neighboring subcarriers are on different OFDM symbols.

### Claim 15 (depends on 11)

The mobile communication system of claim 11, wherein:
the base station is further configured to transmit a third signal including fifth spread ACK/NACK information and sixth spread ACK/NACK information on a third set of four available neighboring subcarriers in an OFDM symbol, wherein the fifth spread ACK/NACK information and the sixth spread ACK/NACK information are coded on the third set of four available neighboring subcarriers as shown in Table 3; and
the terminal is further configured to receive the third signal including the fifth spread ACK/NACK information and the sixth spread ACK/NACK information on the third set of four available neighboring subcarriers:
TABLE 3
Third set of four available
neighboring subcarriers
in an OFDM symbol
antenna A
e1
e2
f1
f2
antenna B
−e2*
e1*
−f2
f1*
antenna C
0
0
0
0
antenna D
0
0
0
0
wherein e1 to e2 are elements of the fifth spread ACK/NACK information, and f1 to f2 are elements of the sixth spread ACK/NACK information,
wherein the fifth spread ACK/NACK information carries the first ACK/NACK information, and the sixth spread ACK/NACK information carries the second ACK/NACK information, and
wherein the first set of four available neighboring subcarriers is separated from the third set of four available neighboring subcarriers by a plurality of subcarriers in the frequency domain.

### Claim 16

A terminal for use in a mobile communication system, wherein the terminal is configured to:
receive a first signal including first spread ACK/NACK information and second spread ACK/NACK information on a first set of four available neighboring subcarriers in an orthogonal frequency division multiplexing (OFDM) symbol; and
receive a second signal including third spread ACK/NACK information and fourth spread ACK/NACK information on a second set of four available neighboring subcarriers in an OFDM symbol,
wherein the first spread ACK/NACK information and the second spread ACK/NACK information are coded on the first set of four available neighboring subcarriers as shown in Table 1,
wherein the third spread ACK/NACK information and the fourth spread ACK/NACK information are coded on the second set of four available neighboring subcarriers as shown in Table 2:
TABLE 1
First set of four available
neighboring subcarriers
in an OFDM symbol
antenna A
a1
a2
b1
b2
antenna B
−a2*
a1*
−b2*
b1*
antenna C
0
0
0
0
antenna D
0
0
0
0
TABLE 2
Second set of four
available neighboring
subcarriers in an
OFDM symbol
antenna A
0
0
0
0
antenna B
0
0
0
0
antenna C
c1
c2
d1
d2
antenna D
−c2*
c1*
−d2*
d1*
wherein a1 to a2 are elements of the first spread ACK/NACK information, b1 to b2 are elements of the second spread ACK/NACK information, c1 to c2 are elements of the third spread ACK/NACK information, d1 to d2 are elements of the fourth ACK/NACK information, and the symbol * denotes a conjugate operation,
wherein the first spread ACK/NACK information and the third spread ACK/NACK information carry first ACK/NACK information,
wherein the second spread ACK/NACK information and the fourth spread ACK/NACK information carry second ACK/NACK information, and
wherein the first set of four available neighboring subcarriers is separated from the second set of four available neighboring subcarriers by a plurality of subcarriers in a frequency domain.

### Claim 17 (depends on 16)

The terminal of claim 16, wherein the terminal is further configured to de-spread either the first and third spread ACK/NACK information or the second and fourth ACK/NACK information for identifying ACK/NACK information allocated to the terminal.

### Claim 18 (depends on 16)

The terminal of claim 16, wherein the terminal is further configured to:
process the first signal based on a coding scheme of the first spread ACK/NACK information and the second spread ACK/NACK information; and
process the second signal based on a coding scheme of the third spread ACK/NACK information and the fourth spread ACK/NACK information.

### Claim 19 (depends on 16)

The terminal of claim 16, wherein the first set of four available neighboring subcarriers and the second set of four available neighboring subcarriers are on different OFDM symbols.

### Claim 20 (depends on 16)

The terminal of claim 16, wherein the terminal is further configured to receive a third signal including fifth spread ACK/NACK information and sixth spread ACK/NACK information on a third set of four available neighboring subcarriers in an OFDM symbol,
wherein the fifth spread ACK/NACK information and the sixth spread ACK/NACK information are coded on the third set of four available neighboring subcarriers as shown in Table 3:
TABLE 3
Third set of four available
neighboring subcarriers
in an OFDM symbol
antenna A
e1
e2
f1
f2
antenna B
−e2*
e1*
−f2*
f1*
antenna C
0
0
0
0
antenna D
0
0
0
0
wherein e1 to e2 are elements of the fifth spread ACK/NACK information, f1 to f2 are elements of the sixth spread ACK/NACK information,
wherein the fifth spread ACK/NACK information carries the first ACK/NACK information, and the sixth spread ACK/NACK information carries the second ACK/NACK information, and
wherein the first set of four available neighboring subcarriers is separated from the third set of four available neighboring subcarriers by a plurality of subcarriers in the frequency domain.