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US 8,947,998 B2Granted
Method and apparatus for detecting radio signal
AssigneesLG Electronics Inc., Postech Academy-Industry Foundation
InventorsKi Jun Kim, Joon Ho Cho, Byung Wook Han
Life of this patent
Estimating the term…
Abstract
In an aspect, a method for transmitting data in a wireless communication system is provided. A wireless device determines a subcarrier and a subcarrier group to which a data sequence is allocated. The wireless device modulates the data sequence by a transmit filter to generate a data stream. A waveform of the transmit filter is determined based on the subcarrier and the subcarrier group. The wireless device generates a transmission signal based on the data stream. The wireless device transmits the transmission signal through the subcarrier. The transmission signal is cyclostationary.
Claims6
A method for transmitting data in a wireless communication system, the method comprising:
- determining, by a wireless device, a subcarrier and a subcarrier group to which a data sequence is allocated;
- modulating, by the wireless device, the data sequence by a transmit filter to generate a data stream, a waveform of the transmit filter determined based on the subcarrier and the subcarrier group;
- generating, by the wireless device, a transmission signal based on the data stream;
- and
- transmitting, by the wireless device, the transmission signal through the subcarrier,
- wherein the transmission signal is cyclostationary,
- wherein the data sequence is a sth data sequence allocated to a nth subcarrier group, and the waveform of the transmit filter sn,s(t) is determined by one of following equations,
- s
- n
- ,
- s
-
- (
- t
- )
- =
- ∑
- l
- =
- 1
- L
-
- g
- ~
-
- (
- t
- )
-
- (
- α
- n
- ,
- s
- ,
- l
-
- ⅇ
- j
-
-
- 2
-
-
- π
-
- (
- f
- l
- +
- n
- -
- 1
- 2
-
-
- NT
- )
-
- t
- +
- α
- n
- ,
- s
- ,
- l
- +
- L
-
- ⅇ
- -
- j
-
-
- 2
-
-
- π
-
- (
- f
- l
- +
- n
- -
- 1
- 2
-
-
- NT
- )
-
- t
- )
- where, L is a natural number determined based on a bandwidth of the wireless communication system and a cycle period of the transmission signal, αn,s,l is a complex-valued weighting factor determining a power and a phase of the subcarrier, N is a number of subcarrier groups, T is a cycle period, {tilde over (g)}(t) is a function of which Fourier transform function {tilde over (G)}(f) is defined by a following equation,
- G
- ~
-
- (
- f
- )
-
- =
- Δ
-
-
- {
- g
- ~
-
- (
- t
- )
- }
- =
- {
- 1
- ,
- ∀
- f
- ∈
- [
- 0
- ,
- 1
- 2
-
-
- NT
- )
- 0
- ,
- elsewhere
- .
- ,
- and fl is a parameter defined by a following equation,
- f
- l
-
- =
- Δ
-
- l
- -
- ⌊
- L
- /
- 2
- ⌋
- -
- 1
- T
- where, └ ┘ is a floor function, or
- s
- n
- ,
- s
-
- (
- t
- )
- =
- ∑
- l
- =
- 1
- L
-
- ∑
- k
- =
- 1
- 2
-
-
- NL
-
- [
-
- α
- n
- ,
- s
- ,
- l
- 2
-
-
- NL
-
- ⅇ
- j
-
-
- 2
-
-
- π
-
- (
- 2
-
- (
- l
- -
- 1
- )
-
- N
- +
- n
- )
-
- k
- /
- (
- 2
-
-
- NL
- )
- +
- α
- n
- ,
- s
- ,
- l
- +
- L
- 2
-
-
- NL
-
- ⅇ
- j
-
-
- 2
-
-
- π
-
- (
- 2
-
-
- lN
- -
- n
- +
- 1
- )
-
- k
- /
- (
- 2
-
-
- NL
- )
- ]
-
- p
-
- (
- t
- -
- kT
- c
- )
- where, L is a natural number determined based on a bandwidth of the wireless communication system and a cycle period of the transmission signal, αn,s,l is a complex-valued weighting factor determining a power and a phase of the subcarrier, N is a number of subcarrier groups, T is a cycle period, p(t) is a sinc pulse of which duration Tc is T/(2NL).
272 more elements
A wireless device in a wireless communication system, the wireless device comprising:
- a radio frequency (RF) unit for receiving a radio signal;
- and
- a processor, operatively coupled with the radio frequency unit, configured to:
- determine a subcarrier and a subcarrier group to which a data sequence is allocated;
- modulate the data sequence by a transmit filter to generate a data stream, a waveform of the transmit filter determined based on the subcarrier and the subcarrier group;
- generate a transmission signal based on the data stream;
- and
- transmit the transmission signal through the subcarrier,
- wherein the transmission signal is cyclostationary,
- wherein the data sequence is a sth data sequence allocated to a nth subcarrier group, and the waveform of the transmit filter sn,s(t) is determined by one of following equations,
- s
- n
- ,
- s
-
- (
- t
- )
- =
- ∑
- l
- =
- 1
- L
-
- g
- ~
-
- (
- t
- )
-
- (
- α
- n
- ,
- s
- ,
- l
-
- ⅇ
- j
-
-
- 2
-
-
- π
-
- (
- f
- l
- +
- n
- -
- 1
- 2
-
-
- NT
- )
-
- t
- +
- α
- n
- ,
- s
- ,
- l
- +
- L
-
- ⅇ
- -
- j
-
-
- 2
-
-
- π
-
- (
- f
- l
- +
- n
- -
- 1
- 2
-
-
- NT
- )
-
- t
- )
- where, L is a natural number determined based on a bandwidth to the wireless communication system and a cycle period of the transmission signal, αn,s,l, is a complex-valued weighting factor determining a power and a phase of the subcarrier, N is a number of subcarrier groups, T is a cycle period, {tilde over (g)}(t) is function of which Fourier transform function {tilde over (G)}(f) is defined by a following equation,
- G
- ~
-
- (
- f
- )
-
- =
- Δ
-
-
- {
- g
- ~
-
- (
- t
- )
- }
- =
- {
- 1
- ,
- ∀
- f
- ∈
- [
- 0
- ,
- 1
- 2
-
-
- NT
- )
- 0
- ,
- elsewhere
- .
- ,
- and fl is parameter defined by a following equation,
- f
- l
-
- =
- Δ
-
- l
- -
- ⌊
- L
- /
- 2
- ⌋
- -
- 1
- T
- where, └ ┘ is a floor function, or
- s
- n
- ,
- s
-
- (
- t
- )
- =
- ∑
- l
- =
- 1
- L
-
- ∑
- k
- =
- 1
- 2
-
-
- NL
-
- [
-
- α
- n
- ,
- s
- ,
- l
- 2
-
-
- NL
-
- ⅇ
- j
-
-
- 2
-
-
- π
-
- (
- 2
-
- (
- l
- -
- 1
- )
-
- N
- +
- n
- )
-
- k
- /
- (
- 2
-
-
- NL
- )
- +
- α
- n
- ,
- s
- ,
- l
- +
- L
- 2
-
-
- NL
-
- ⅇ
- j
-
-
- 2
-
-
- π
-
- (
- 2
-
-
- lN
- -
- n
- +
- 1
- )
-
- k
- /
- (
- 2
-
-
- NL
- )
- ]
-
- p
-
- (
- t
- -
- kT
- c
- )
- where, L is a natural number determined based on a bandwidth of the wireless communication system and a cycle period of the transmission signal, αn,s,l is a complex-valued weighting factor determining a power and a phase of the subcarrier, N is a number of subcarrier groups, T is a cycle period, p(t) is a since pulse of which duration Tc is T/(2NL).
275 more elements
Dependencies are inferred from the claim text.