Understanding and Testing RF Multi-Channel Systems - Part 2
白皮书
Engineers turn to multi-antenna techniques to achieve diversity, multiplexing, or antenna gains. Through these gains, the wireless systems can increase the receiver’s robustness, data throughput, and signalto-noise ratio (SNR). Multi-antenna RF systems use a common local oscillator (LO) distributing to multiple channels. Testing multi-antenna systems requires a test system capable of providing multiple signals and a constant phase relationship between the signals. However, a commercial signal generator has an independent synthesizer to upconvert an intermediate frequency (IF) signal to an RF signal. Further, using commercial signal generators to simulate multi-channel RF systems may result in some phase errors between the signal generators. Engineers must minimize such errors to accurately characterize the systems.