Cdma2000 1x Reverse Traffic Channel Simulation And Key Technologies

The system of CDMA2000 1x, which is one of the mainstream projects of the third generation mobile communication system, provides high rate packet data service for users. Instead of that of the speech service, the purpose of the data service is to maximize the data capacity of the system. Generally speaking, the capacity of the CDMA system depends on that of the reverse link. Therefore the research on the reverse link especially on the reverse traffic channel is significant.The general research on the theory of the reverse traffic channel of the CDMA2000 1x system is a preparation for the visiable simulation by Simulink toolbox on MATLAB platform. Following the protocol of CDMA2000 1x, The encoding, interleaving, Orthogonal Spreading and modulation are realized based on Radio configuration 3 and 4. Concretely it is designed that the module of CRC encoder, convolutional encoder. Orthogonal Spreading, PN sequence, signal modulation and the global initialization, the module of global initialization is used to set some common parameters of the whole simulation model. And simulation results that is the spectrum of CDMA2000 1x reverse traffic channel modulated signals accords with CDMA2000 protocol requirements.Through the farther analyse on the system capacity of the reverse link, which is also one of key technology, we get the result that so many strong measures to improve system capacity, including precise open-loop and close loop combined power control, speech activity detector, divide a cell to multi-sector for frequency re-utilization, using technical correction of errors to reduce Signal-to-Noise. These measures used greatly strengthen CDMA2000 1x system reverse link capacity.