The Research And Implementation In Minimized Receiver With Advanced Roadbandwidth And Quad-channels Shanghai Jiao Tong University

The third generation of communication system has been started masspopularization application, and international has being begun the fourthgeneration mobile communication research and business development.This topic, based on the next generation broadband mobilecommunication system’s requirement, focuses on the research anddevelopment of receiver. First, the key technology of LTE system: OFDM,MIMO and demodulation, coding techniques is introduced. Second,referenced to the3G system’s technology and characters, the receiver’sperformance requirements, interface definitions, and the main parameters ofreceiving circuit and several kinds of receiver’s proposal are described.The fourth chapter mainly introduces the multi-channels broadbandreceiver design and implementation. The receiver circuits use full-duplex(TDD) and super-heterodyne receiver structure on2.5GHz.The system isfour channels receiver. In each channel, it contains switching circuit, signalstrength detection circuit, and gain control circuit, orthogonal demodulationcircuit, base band amplifier, filters and the frequency generator. Each modulecircuit module’s specification, the key devices specific circuits, and the entirereceiver do link budget are described. The final circuit is tested, and theperformance is good agreed with preliminary estimation. The total designexactly reaches the preliminary requirements.At last, the existing problems in this system are listed and furtherimprovement suggestion is concluded.