Achievable information rates of bipolar 4- and 8-ary constellations are experimentally compared to those of intensity modulation (IM) when using an oversampled direct detection receiver. The bipolar constellations gain up to 1.8 dB over their IM counterparts.

翻译：两极4型和8型星座的信息率是实验性的,在使用过度抽样的直接探测接收器时,与强度调控率(IM)相比,两极4型和8型星座的信息率是实验性的,两极星座的IM对等星座增加至1.8 dB。