发明名称 |
Carrier frequency correction using pilot blocks |
摘要 |
A pilot symbol detection section (1) detects and extracts pilot symbols from a despread signal. An inter-symbol phase shift detection section (2) detects the phase shifts between adjacent pilot symbols in a pilot symbol block (inter-symbol phase shifts). An inter-pilot block phase shift detection section (3) detects the phase shifts between adjacent pilot symbol blocks (inter-pilot block phase shift). An inter-symbol phase shift averaging section (4) takes the average of the inter-symbol phase shifts. An inter-pilot block phase shift averaging section (5) takes the average of the inter-pilot block phase shifts. A frequency correction determination section (6) determines an appropriate frequency correction based on the outputs of the inter-symbol phase shift averaging section (4) and the inter-pilot block phase shift averaging section (5). A frequency correction signal outputted by the frequency correction determination section (6) is used for correcting the frequency of a local oscillation signal which is used for the detection (despreading) of a received radio signal. A large frequency difference can be corrected accurately and at once regardless of whether it is at the beginning of communication or in the middle of communication. <IMAGE> |
申请公布号 |
EP1041788(B1) |
申请公布日期 |
2005.11.02 |
申请号 |
EP20000106842 |
申请日期 |
2000.03.30 |
申请人 |
NEC CORPORATION |
发明人 |
KONDO, TAKAYUKI |
分类号 |
H03J7/02;H04B1/707;H04B1/7087;H04B7/26;H04L27/00;H04L27/227;H04W56/00;H04W88/02 |
主分类号 |
H03J7/02 |
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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