| 摘要 |
PROBLEM TO BE SOLVED: To provide a receiver for wireless communication network with an extended range. SOLUTION: A technique for detecting and demodulating a signal/transmission is described. The signal detection is performed in a plurality of stages using different types of signal processing, such as, for example, using time-domain correlation in a first stage, frequency-domain processing in a second stage, and time-domain processing in a third stage. In the first stage, products of symbols are generated for at least two different delays, correlation processing between the products of respective delays and known values is performed, and correlation results for all delays are combined to declare the presence of a signal. In the demodulation, the timing of input samples is adjusted to obtain timing-adjusted samples. A frequency offset is estimated and removed from the timing-adjusted samples to obtain frequency-corrected sample, which are processed through channel estimate to obtain detected symbols. COPYRIGHT: (C)2011,JPO&INPIT |
