| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a technique to support simultaneous transmission for more terminals in a multiple access system. <P>SOLUTION: In a single-carrier frequency division multiple access (SC-FDMA) system that utilizes interleaved FDMA (IFDMA) or localized FDMA, a multitude of transmitters transmit their pilots which are orthogonal to one another using time division multiplexing (TDM), code division multiplexing (CDM), interleaved frequency division multiplexing (IFDM), or localized frequency division multiplexing (LFDMA). A receiver performs complementary demultiplexing (non-multiplexing) on the pilots and derives a channel estimate associated with each transmitter using an MMSE technique or a least-squares technique. The receiver separates data transmissions sent on the same time-frequency block through the use of spatial filter matrices. The receiver derives the spatial filter matrices based on the channel estimates and using also a zero-forcing, MMSE, or maximal ratio combining technique. <P>COPYRIGHT: (C)2011,JPO&INPIT |
