发明名称 |
Enhancing channel estimates made in digital communications receivers |
摘要 |
Schemes for combining channel-estimates from different OFDM frames after compensating for changes in receiver-transmitter characteristics. |
申请公布号 |
US8787504(B2) |
申请公布日期 |
2014.07.22 |
申请号 |
US201213679942 |
申请日期 |
2012.11.16 |
申请人 |
Cambridge Silicon Radio Limited |
发明人 |
Popescu Andrei Barbu |
分类号 |
H04L27/06 |
主分类号 |
H04L27/06 |
代理机构 |
Pillsbury Winthrop Shaw Pittman LLP |
代理人 |
Pillsbury Winthrop Shaw Pittman LLP |
主权项 |
1. A method of refining a channel estimate for an OFDM sub-carrier, the method comprising:
calculating a first channel estimate for an OFDM sub-carrier for a first OFDM frame received at a receiver from a transmitter; calculating a second channel estimate for the OFDM sub-carrier for a second OFDM frame received at the receiver from the transmitter at a time later than the first OFDM frame is received; adjusting the first channel estimate to ameliorate a difference between the first and second channel estimates that arises from a shift in an operating state of the transmitter and the receiver between the times of reception of the first and second OFDM frames; measuring a discrepancy between the second channel estimate and the adjusted first channel estimate; modifying the second channel estimate by averaging the second channel estimate with the adjusted first channel estimate if the discrepancy is smaller than a predetermined amount; and demodulating data from the second OFDM frame using the modified second channel estimate. |
地址 |
Cambridge GB |