Non-coherent frequency compensation and modulation method and demodulating apparatus
A technology of frequency compensation and demodulation method, applied in multi-carrier systems and other directions, can solve the problems of inability to perform frequency compensation, coherent demodulation difficult to meet the low power consumption requirements of wireless communication, poor demodulation performance, etc. The effect of easy low-power integration and good frequency error compensation capability
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no. 2 Embodiment
[0052] Figure 5 A block diagram showing a configuration example of an apparatus for demodulating a half-cosine shaped OQPSK or MSK modulated signal according to the second embodiment. The receiving device has a digital down converter 501, a channel filter 502, a phase operator 503, a phase differencer 504, a carrier frequency compensator and an average operator 505, a PN code code table 506, a PN code correlator 507, and a symbol decision device 508.
[0053] Figure 5 The working process of the shown demodulator is explained as follows:
[0054] The structure of the wireless transceiver system used by the demodulator adopts a low-IF structure, and the transmitting end adopts half-cosine OQPSK or MSK signal modulation, and directly spreads the binary baseband data into PN codes, and then modulates and transmits with the carrier. The receiving end is connected to the demodulator through the RF front end. The intermediate frequency signal is in the form of a complex signal, ...
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