US 8,559,536 B2Granted

Transmission device, reception device, and OFDM transmission method

AssigneePanasonic Corporation

InventorsKenichiro Hayashi, Tomohiro Kimura

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Abstract

SP signals to be transmitted from a first transmitting antenna are arranged in the same pattern as SP signals to be transmitted from a second transmitting antenna. The SP signals to be transmitted from the second transmitting antenna in one symbol are generated, such that the polarity of the SP signals are alternately inverted and non-inverted with respect to the SP signals to be transmitted from the first transmitting antenna in the same symbol. Thus, in the direction that the symbol number is incremented by 1 and the carrier number is incremented by 3, the polarity of SP signals transmitted from the second transmitting antenna are all inverted or non-inverted with respect to the polarity of corresponding SP signals transmitted from the first transmitting antenna.

Claims9

Dependent claims

A transmitter having first to Mth transmitting antennas, where M is an integer equal to or greater than 2, and for transmitting an OFDM signal obtained by modulating a plurality of carriers per symbol duration,

the OFDM signal containing pilot signals scattered on a carrier-symbol plane,
on the carrier-symbol plane, k denoting a carrier number, n denoting a symbol number, Δk denoting an interval between pilot signals in a same symbol, Δn denoting an interval between pilot signals in a same carrier, and p denoting an integer greater than or equal to 0,
nS and kS each denoting a nonzero integer, and m denoting an integer satisfying 1≦m≦M,
when 2≦m≦M, neither (m−1)ns nor (m−1)ks being equal to an integral multiple of M,
the carrier number kP(n) of a carrier that transmits a pilot signal in a symbol with the symbol number n satisfying Equation 1,
k
P
⁡
(
n
)
=
Δ
⁢
⁢
k
Δ
⁢
⁢
n
×
(
n
⁢
mod
⁢
⁢
Δ
⁢
⁢
n
)
+
Δ
⁢
k
×
p
,
[
Equation
⁢
⁢
1
]
the transmitter comprising:
a generating unit operable to generate the pilot signals as mth pilot signals for an mth antenna, where 1≦m≦M, such that a phase difference between a phase of each mth pilot signal and a phase of a reference pilot signal is equal to a value given by Equation 2,
j
⁢
⁢
2
⁢
π
⁡
[
(
m
-
1
)
⁢
n
s
M
⁢
⁢
Δ
⁢
⁢
n
⁢
n
-
(
m
-
1
)
⁢
k
s
M
⁢
⁢
Δ
⁢
⁢
k
⁢
k
]
;
[
Equation
⁢
⁢
2
]
a transmitting unit operable to transmit, from the mth transmitting antenna, the OFDM signal containing the mth pilot signals generated by the generating unit.

96 more elements

A receiver for receiving an OFDM signal transmitted from a transmitter having a plurality of first to Mth transmitting antennas, where M is an integer greater than or equal to 2, the OFDM signal being obtained by modulating a plurality of carriers per symbol duration,

the OFDM signal containing a plurality of pilot signals scattered on a carrier-symbol plane,
on the carrier-symbol plane, k denoting a carrier number, n denoting a symbol number, Δk denoting an interval between pilot signals in a same symbol, Δn denoting an interval between pilot signals in a same carrier, and p denoting an integer greater than or equal to 0,
nS and kS each denoting a nonzero integer, and m denoting an integer satisfying 1≦m≦M,
when 2≦m≦M, neither (m−1)ns nor (m−1)ks being equal to an integral multiple of M,
the carrier number kP(n) of a carrier that transmits a pilot signal in a symbol with the symbol number n satisfying Equation 1,
k
P
⁡
(
n
)
=
Δ
⁢
⁢
k
Δ
⁢
⁢
n
×
(
n
⁢
⁢
mod
⁢
⁢
Δ
⁢
⁢
n
)
+
Δ
⁢
k
×
p
,
[
Equation
⁢
⁢
1
]
the pilot signals transmitted from an mth one of the transmitting antennas, (where m is an integer satisfying 1≦m≦M, being mth pilot signals, such that a phase difference between a phase of each mth pilot signal and a phase of a reference pilot signal is equal to a value given by Equation 2,
j
⁢
⁢
2
⁢
π
⁡
[
(
m
-
1
)
⁢
n
s
M
⁢
⁢
Δ
⁢
⁢
n
⁢
n
-
(
m
-
1
)
⁢
k
s
M
⁢
⁢
Δ
⁢
⁢
k
⁢
k
]
,
[
Equation
⁢
⁢
2
]
the receiver comprising:
a receiving antenna with which the OFDM signal from the transmitter is received;
a response estimation unit operable to estimate a channel response of each of first to Mth channels respectively from the first to Mth antennas to the receiving antenna, the estimation being carried out based on Equation 2 and pilot signals contained in the OFDM signal received with the receiving antenna;
and
a signal estimation unit operable to estimate first to Mth transmission signals based on the received OFDM signal and the estimated channel responses of the first to Mth transmission channels, the first to Mth transmission signals corresponding to first to Mth OFDM signals transmitted respectively from the first to Mth transmitting antennas.

100 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/602,844Filed 19 Jun 2008
Priority: JP 2007-16499822 Jun 2007
Published: US 2010/0272199 A128 Oct 2010
Granted: 15 Oct 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

H04B 7/10
Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas: polarisation diversity; Directional diversity
H04L 5/0023
Three-dimensional division: time-frequency-space
H04L 5/0051
Allocation of pilot signals, i.e. of signals known to the receiver: of dedicated pilots, i.e. pilots destined for a single user or terminal
H04L 25/0204
Channel estimation: of multiple channels