发明名称 |
CHANNEL STATE INFORMATION RECONSTRUCTION FROM SPARSE FEEDBACK DATA |
摘要 |
Accurate downlink channel estimates are calculated based on infrequently transmitted Channel State information (CSI) feedback data from a UE 20. A plurality of non-uniformly spaced digital CSI feedback samples, representing the frequency response of a downlink communication channel, is received from the UE, The received CSI feedback samples are demodulated and inverse quantized. A time domain tap delay channel model is generated from the inverse quantized CSI feedback samples. The time domain tap delay channel model may be frequency-transformed to obtain a reconstructed frequency response of the downlink communication channel in the frequency domain. Alternatively, channel delays may be estimated based on prior delays and/or known references signals transmitted on the uplink. Channel estimates between CSI reporting instances may be predicted, such as by a sample & hold or a linear predictor. The delays may be presumed fixed, and Kalman filter coefficients evolved over time. |
申请公布号 |
WO2010122536(A3) |
申请公布日期 |
2011.03.17 |
申请号 |
WO2010IB51808 |
申请日期 |
2010.04.23 |
申请人 |
TELEFONAKTIEBOLAGET L M ERICSSON (PUBL);CHENG, JUNG-FU;ZANGI, KAMBIZ;HUI, DENNIS;KRASNY, LEONID |
发明人 |
CHENG, JUNG-FU;ZANGI, KAMBIZ;HUI, DENNIS;KRASNY, LEONID |
分类号 |
H04B7/04;H04B7/06;H04L1/00 |
主分类号 |
H04B7/04 |
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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