公开(公告)号：US20070041457A1

公开(公告)日：2007-02-22

申请号：US11261823

申请日：2005-10-27

申请人： Tamer Kadous ,  Aamod Khadekar ,  Dhananjay Gore ,  Alexei Gorokhov

发明人： Tamer Kadous ,  Aamod Khadekar ,  Dhananjay Gore ,  Alexei Gorokhov

IPC分类号： H04K1/10

CPC分类号： H04L5/0023 ,  H04B7/0456 ,  H04B7/061 ,  H04B7/0671 ,  H04B7/0691 ,  H04B7/0697 ,  H04L27/2602

摘要： Transmission schemes that can flexibly achieve the desired spatial multiplexing order, spatial diversity order, and channel estimation overhead order are described. For data transmission, the assigned subcarriers and spatial multiplexing order (M) for a receiver are determined, where M≧1. For each assigned subcarrier, M virtual antennas are selected from among V virtual antennas formed with V columns of an orthonormal matrix, where V≧M. V may be selected to achieve the desired spatial diversity order and channel estimation overhead order. Output symbols are mapped to the M virtual antennas selected for each assigned subcarrier by applying the orthonormal matrix. Pilot symbols are also mapped to the V virtual antennas. The mapped symbols are provided for transmission from T transmit antennas, where T≧V. Transmission symbols are generated for the mapped symbols, e.g., based on OFDM or SC-FDMA. Different cyclic delays may be applied for the T transmit antennas to improve diversity.

摘要翻译： 描述了可以灵活地实现期望的空间复用顺序，空间分集顺序和信道估计开销顺序的传输方案。 对于数据传输，确定接收机的分配子载波和空间复用顺序（M），其中M> = 1。 对于每个分配的子载波，从形成有正交矩阵的V列的V个虚拟天线中选择M个虚拟天线，其中V> = M。 可以选择V以实现期望的空间分集顺序和信道估计开销顺序。 通过应用正交矩阵将输出符号映射到为每个分配的副载波选择的M个虚拟天线。 导频符号也映射到V虚拟天线。 所映射的符号被提供用于从T个发射天线传输，其中T> = V。 为映射符号生成传输符号，例如，基于OFDM或SC-FDMA。 可以对T发射天线应用不同的循环延迟以改善分集。