Transmission signals, methods and apparatus

专利名称：Transmission signals, methods and

apparatus

发明人：Magnus Sandell,Darren Phillip McNamara申请号：US11033865申请日：20050113

公开号：US20050195734A1公开日：20050908

专利附图：

摘要：The invention relates to apparatus, methods, processor control code andsignals for channel estimation in MIMO (Multiple-input Multiple-output) OFDM

(Orthogonal Frequency Division Multiplexed) communication systems. An OFDM signal is

transmitted from an OFDM transmitter using a plurality of transmit antennas but has oneor more nulled subcarriers, corresponding to windowing in the frequency domain. TheOFDM signal is adapted for channel estimation for channels associated with said transmitantennas by the inclusion of orthogonal training sequence data in the signal from eachsaid antenna. The training sequence data is derived from substantially orthogonaltraining sequences for each said transmit antenna, the training sequences being

constructed based upon sequences of values =exp(πkm/M) where k indexes a value in asaid sequence, m indexes a transmit antenna, and M is the number of transmit antennas.Embodiments of these techniques provide training sequences that are more robust to,inter alia, nulled subcarriers.

申请人：Magnus Sandell,Darren Phillip McNamara

地址：Bristol GB,Bristol GB

国籍：GB,GB

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