发明名称 |
OFDM TIMING AND FREQUENCY RECOVERY SYSTEM |
摘要 |
A synchronizing apparatus for a differential OFDN receiver that simultaneously adjust the radio frequency and sample clock frequency using a voltage controlled crystal oscillator to generate a common reference frequency. Timing errors are found by constellation rotation. Subcarrier signals are weighted by using complex multiplication to find the phase differentials and then the timing errors. The reference oscillator is adjusted using the timing errors. Slow frequency drift may be compensated using an integral of the timing error. Frequency offset is found using the time required for the timing offset to drift from one value to another.
|
申请公布号 |
CA2183140(A1) |
申请公布日期 |
1998.02.13 |
申请号 |
CA19962183140 |
申请日期 |
1996.08.12 |
申请人 |
TELECOMMUNICATIONS RESEARCH LABORATORIES |
发明人 |
MCGIBNEY, GRANT |
分类号 |
H04L27/26;(IPC1-7):H04J11/00;H04L12/28 |
主分类号 |
H04L27/26 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|