发明名称 |
Antenna phase estimation algorithm for WCDMA closed loop transmitter antenna diversity system |
摘要 |
<p>This invention teaches a method for use in a wideband CDMA telecommunications system wherein the base station (BS) utilizes transmit antenna diversity. The method enables the user equipment (UE) to perform a channel estimate for channels received from two antennas of the base station (BS), and includes steps of: (a) computing an estimated phase difference between a common pilot channel and a dedicated pilot channel received from one antenna of the two antennas; and (b) determining the channel estimate by rotating a common pilot channel estimate according to the estimated phase difference, where the phase difference is computed as a complex coefficient between the common pilot channel and the dedicated pilot channel. In a second aspect this invention teaches a method for use in a transmit antenna diversity system for enabling the UE to verify an antenna phase shift previously signaled by the UE to the BS. This method includes a first step of: (a) exploiting prior knowledge of BS rotation angle by considering a vector x that includes all hypotheses for complex rotation coefficients of the BS with respect to all possible rotation angles, in accordance with a decision rule for an estimation of a complex rotation coefficient. A second step of the method evaluates a cost function of a hypothesis m by considering the prior knowledge. <IMAGE></p> |
申请公布号 |
EP1191755(A2) |
申请公布日期 |
2002.03.27 |
申请号 |
EP20010308008 |
申请日期 |
2001.09.20 |
申请人 |
NOKIA CORPORATION |
发明人 |
PAJUKOSKI, KARI;AUTIO, ERKKI;KESKITALO, LLKKA;KINNUNEN PASI |
分类号 |
H04B7/06;H04B7/08;H04B7/26;H04L25/02;(IPC1-7):H04L25/02 |
主分类号 |
H04B7/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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