发明名称 |
PILOT-SIGNAL TRANSMISSION AND CHANNEL ESTIMATION FOR A FREQUENCY DIVISION MULTIPLEXING COMMUNICATION SYSTEM |
摘要 |
A transmitter generates a pilot having a constant time-domain envelope and a flat frequency spectrum based on a polyphase sequence. To generate a pilot IFDMA symbol, a first sequence of pilot symbols is formed based on the polyphase sequence and replicated multiple times to obtain a second sequence of pilot symbols. A phase ramp is applied to the second pilot symbol sequence to obtain a third sequence of output symbols. A cyclic prefix is appended to the third sequence of output symbols to obtain an IFDMA symbol, which is transmitted in the time domain via a communication channel. The pilot symbols may be multiplexed with data symbols using TDM and/or CDM. A pilot LFDMA symbol may also be generated with a polyphase sequence and multiplexed using TDM or CDM. A receiver derives a channel estimate based on received pilot symbols and using minimum mean-square error, least-squares, or some other channel estimation technique. |
申请公布号 |
UA90133(C2) |
申请公布日期 |
2010.04.12 |
申请号 |
UA20070010986 |
申请日期 |
2006.03.07 |
申请人 |
QUALCOMM INCORPORATED |
发明人 |
PALANKI, RAVI;KHANDEKAR, AAMOD |
分类号 |
H04B1/69;H04L25/02;H04L27/26 |
主分类号 |
H04B1/69 |
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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