| 摘要 |
The baseband receiver provides a baseband process operating on a receiver in a communication system, such as an 802.15.4 communication system. The baseband process digitizes a baseband signal, and uses less than the full resolution of the digitized data to perform an automatic gain control. In another aspect of the baseband receiver a data frame is detected using less than the full resolution of the digitized data, and without the need for prior synchronization. After a frame is detected, the baseband signal is correlated with reference signals from a set of predefined reference signals, and the reference signal with the best correlation is identified. By identifying the best correlating reference signal, the baseband process is able to identify a characteristic of the baseband signal. In one example of the baseband process, the baseband signal is correlated against a set of sync reference signals to find a sync offset for the baseband signal, and then the baseband signal may be correlated against a set of symbol reference signals to decode sequential symbols. Specific circuit structures enable highly efficient parallel or serial correlations using only one bit of resolution in the digital signal waveforms.
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