| 摘要 |
<p>The invention produces I and Q datastreams which are up-mixed and transmitted (Fig. 2). The I and Q datastreams may be identical. The receiver performs I and Q down-mixing on the signal to produce I and Q (Fig. 3) analogue signals that are sampled, possibly oversampled at 3 samples per symbol period. A 1-bit ADC may be used for sampling. The invention may autocorrelate the I and Q digital signals for frame detection 503-4. If a frame is detected 505-6 cross correlation with a known 508-9 or inverted 511-12 synchronisation sequence may be performed. This allows the demodulation of the (anti)phase I and Q signals. The invention may then perform error checking on the demodulated I and Q signals and select the one with the least errors. The invention may be used with channels operating in terahertz bands and is intended to allow signal demodulation without requiring frequency offset compensation.</p> |
