发明申请
US20090310715A1 RECEIVER AND METHOD FOR PROCESSING RADIO SIGNALS USING SOFT PILOT SYMBOLS
有权
使用软件引导符号处理无线电信号的接收器和方法
- 专利标题: RECEIVER AND METHOD FOR PROCESSING RADIO SIGNALS USING SOFT PILOT SYMBOLS
- 专利标题(中): 使用软件引导符号处理无线电信号的接收器和方法
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申请号: US12239918申请日: 2008-09-29
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公开(公告)号: US20090310715A1公开(公告)日: 2009-12-17
- 发明人: Douglas Cairns , Elias Jonsson
- 申请人: Douglas Cairns , Elias Jonsson
- 主分类号: H04L27/38
- IPC分类号: H04L27/38 ; H04L27/06
摘要:
A receiver and method for receiving and processing a sequence of transmitted symbols in a digital communication system utilizing soft pilot symbols. A set of soft pilot symbols are transmitted with higher reliability than the remaining symbols in the sequence by modulating the soft pilot symbols with a lower order modulation such as BPSK or QPSK while modulating the remaining symbols with a higher order modulation such as 16QAM or 64QAM. The receiver knows the modulation type and location (time/frequency/code) of the soft pilot symbols, and demodulates them first. The receiver uses the demodulated soft pilot symbols as known symbols to estimate parameters of the received radio signal. Unlike traditional fixed pilots, the soft pilots still carry some data. Additionally, the soft pilots are particularly helpful in establishing the amplitude reference essential in demodulating the higher order modulation symbols.
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