US 8,428,172 B2Granted

Method of transmitting and receiving a midamble for channel estimation of multiple antennas

AssigneeLG Electronics Inc.

InventorsJin Young Chun, Hyun Soo Ko, Moon Il Lee, Bin Chul Ihm, Wook Bong Lee

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Abstract

A method of transmitting a midamble for channel estimation of multiple antennas performed by a base station in a system having segregated uplink and downlink frequency bands is provided. The method includes transmitting midamble information indicating presence of the midamble within a downlink frame to a user equipment (UE), and transmitting the midamble on a single downlink subframe among at least one downlink subframe included in the downlink frame or on a common zone to the UE by using the multiple antennas. A scheduling overhead of a base station and other overheads can be reduced by decreasing the number of transmissions of a midamble on one downlink frame, and thus limited radio resources can be effectively used.

Claims6

Dependent claims

A method of transmitting a midamble, performed by a base station, for channel estimation of multiple antennas in a system having segregated uplink and downlink frequency bands, the method comprising:

transmitting midamble information comprising a duration and a midamble period to a user equipment (UE), wherein the duration indicates a valid time of the midamble information and the midamble period indicates a downlink frame at which a midamble is transmitted among a plurality of downlink frames;
and
transmitting the midamble on a predetermined downlink subframe among a plurality of downlink subframes included in the downlink frame to the UE by using the multiple antennas,
wherein the midamble is mapped to a last orthogonal frequency division multiplexing (OFDM) symbol of the predetermined downlink subframe in a time domain, and to subcarriers determined by a total number of the multiple antennas and an index of an antenna to be mapped in a frequency domain, and
wherein the subcarriers corresponding to an OFDM symbol used to transmit the midamble are allocated according to the following equation:
-
(
N
used
/
2
)
+
n
+
2
⁢
k
×
⌈
N
t
2
⌉
where n denotes an index of an antenna to be mapped, Nt denotes a total number of the multiple antennas, k denotes a subcarrier index, and Nused denotes a total number of subcarriers in use.

22 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/936,394Filed 3 Apr 2009
Priority: KR 10-2008-003293710 Apr 2008
Published: US 2011/0026627 A13 Feb 2011
Granted: 23 Apr 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H04L 5/0092
Signalling for the administration of the divided path, e.g. signalling of configuration information: indication of how the channel is divided
H04L 5/0007
Time-frequency: the frequencies being orthogonal, e.g. OFDM or DMT
H04L 5/0048
Arrangements for allocating sub-channels of the transmission path: allocation of pilot signals, i.e. of signals known to the receiver
H04L 5/14
Arrangements affording multiple use of the transmission path: two-way operation using the same type of signal, i.e. duplex