Research And Implement Of HF~UHF Band Multi-channel Receiver

With the development of wireless communication, MIMO (Multiple-InputMultiple-Output) technology is getting people’s attention and application because of therequirement of data carrying capacity of wireless communication. MIMO is a newtechnology, related to conventional SISO （Single-Input Single-Output）communication system. The channel capacity and the efficiency of frequency can beenhanced by using multipath transmission. Multiple-channel transceiver became a topicresearch these years.The process of the multi-channel receiver, which is a part of a transceiver andreceiver system, is introduced in this thesis. Suitable chips are selected after thereceiver’s parameters being determined. Finally, PCB is made. This receiver’soperating frequency coverage3MHz~88MHz,108MHz~174MHz,225MHz~400MHz,750MHz~850MHz, designed as four receiver structure.A triple-conversion heterodyne receiver structure is used and the IF of the receiverare70MHz and21.4MHz. Specially, because of lacking360°phase shifter in themarket, which operating frequencies is below1GHz and can be programmed by MCU,a new method is proposed. By using of a kind of a vector multiplier multiplication chip,360°phase control effect is achieved, which can be used in the same situation afterthe capacitance value be recalculated. Lacking of testing equipment, the module’saccuracy is not tested.Finally, the amplitude and phase consistency, image frequency, spurious signalsand other indicators are tested. The results are analyzed and reasonable explanation isgiven at the last of this thesis.