Figure 7From: Ultra-spectra communication system (USCS): a promising way to energy-efficient green communication networksPerformance of FCM method. (a) FCM cost function versus iterations; (b) Pattern representations of received signals. In (b), notice that the patterns labeled by squares and circles represent the real transmitted bit "0" and "1", while the patterns labeled by "+" and "." denote the clustering result.Back to article page