Multimode receiver and receiving method therefor

摘要

Disclosed is a multimode receiver, comprising: an antenna system configured to receive a signal sent by a base station and select a receiving circuit front end according to the frequency band of the signal; more than one receiving circuit front end configured to perform down-conversion frequency processing on a signal sent by the antenna system and send the processed signal to an I/Q demodulator; the I/Q demodulator configured to demodulate the signal sent by the receiving circuit front ends and send the demodulated signal to a baseband unit; and the baseband unit configured to decode the demodulated signal. Disclosed is a receiving method for a multimode receiver. By adopting the present invention, one set of receiving circuit front ends can be utilized for signals of the same frequency band and different modes, decreasing the number of radio-frequency chips, and lowering the cost.

主权项

1. A multi-mode receiver, comprising an antenna, an antenna switch, one or more receiving circuit front ends in parallel, a protocol detecting device, an In-phase/Quadrature I/Q demodulator, and a baseband unit, the antenna being connected to one end of the antenna switch, the other end of the antenna switch being connected to an input of the protocol detecting device, a first output of the protocol detecting device being connected to an input of the I/Q demodulator, a second output of the protocol detecting device being connected to an input of the baseband unit, the other end of the antenna switch further being connected to input of the one or more receiving circuit front ends, the input of the I/Q demodulator further being connected to output of the one or more receiving circuit front ends, wherein
the antenna is configured for: receiving a signal sent by a base station BS, and transferring the signal sent by the BS to the antenna switch, the signal sent by the BS being in a mode and in a frequency band; the antenna switch is configured for: receiving the signal received by the antenna, forwarding the signal received by the antenna to a receiving circuit front end of the one or more receiving circuit front ends that corresponds to the frequency band of the signal received by the antenna, and sending the signal received by the antenna to the protocol detecting device; each of the one or more receiving circuit front ends is configured for: receiving the signal received by the antenna forwarded by the antenna switch, performing frequency conversion on the signal received by the antenna, and sending the down-converted signal to the I/Q demodulator, the frequency conversion comprising filtering, amplification, down-conversion, Intermediate-Frequency IF filtering, and IF amplification; the protocol detecting device is configured for: receiving and detecting the signal received by the antenna; determining, according to synchronization information of the signal-sending BS side, the mode of the signal received by the antenna; selecting, according to the determined mode of the signal received by the antenna, a transmission mode for transmitting a demodulated signal and a decoding mode for decoding the demodulated signal; informing the I/Q demodulator of the selected transmission mode; informing the baseband unit of the selected decoding mode; the I/Q demodulator is configured for: receiving and demodulating the down-converted signal; sending the demodulated signal to the baseband unit according to the transmission mode selected by the protocol detecting device; and the baseband unit is configured for: decoding the demodulated signal in the decoding mode selected by the protocol detecting device.