A Study of Microwave Six-Port OFDM Demodulator

A novel microwave six-port network orthogonal frequency division multiplexing (OFDM) demodulator is presented in this paper. The model of demodulator is educed. The influence of local oscillator level and input level of microwave six-port network to demodulator are simulated in the condition of IEEE802.11a communication system. The characteristics of error vector magnitude (EVM) of demodulator are investigated when 90° hybrid bridge and 0° hybrid bridge in microwave six-port network have amplitude/phase imbalance separately or synchronously, respectively. The performance of this demodulator is discussed. The result shows that microwave six-port network can be used to realize a multi-band, multi-mode and multi-carrier OFDM demodulator.