On ASIC Algorithm For Power Line Spread Spectrum Carrier Communication

At present, Power Line Communication (PLC) develops very fast abroad. The modulation and demodulation technology of OFDM has been hoped to be a solution for the question of "the last one-kilometer" today. And also the technology of PLC applied to intelligent building ,electric power transcribing, family automatization has become mature. But there is a bad effect of using the abroad PLC Modem chips when applied in our country. This is because the different PLC environment between domestic and foreign. So it is necessary to empolder a PLC Modem chip that can suit the special environment of our country.After analyzing the status of low voltage power line communication, this paper mainly does some algorithm emulations and experiments for the PLC Modem ASIC. The carrier adopts Binary Frequency-Shift Keying (2FSK). The detail discuss of 2FSK and its C language emulation hardware experiment are given in this paper. In order to restrain the high noise in low voltage power line, a spread spectrum scheme for PLC is also designed in this system.At first, the author does some theory discuss of 2FSK and algorithm emulation under the C language environment. The emulation result demonstrates that the arithmetic can demodulate the transmitted data correctly under the interface of white noise. Then in order to get its result in hardware experiment, the author builds hardware system using TI's DSP TMS320VC5402 and does the software debugging on the DSP's environment CCS 1.2. During actual experiment, 2FSK's self-loop test is accomplished. The experiment result demonstrates that in the non real time demodulating process, the 2FSK algorithm is able to demodulate the transmitted data with an upper veracity.