Improving Performance of Direct-Detection Terahertz Communication System based on k-Means Adaptive Vector Quantization

The performance of the adaptive vector quantization based on k-means clustering for direct-detection terahertz communication in 0.3 THz band is studied by simulation. Compared with the traditional uniform quantization, the two-dimensional k-means quantization can effectively improve the bit error rate by more than an order of magnitude with 2 quantization bits per sample, which can facilitate the low-power and low-cost receivers.