A transmitter in a network transmits transmissions in accordance with an asymmetric signal constellation. A channel impairment in the network is detected. In response, a transmitter adjustment value for adjusting modulations at the transmitter is determined, the transmitter adjustment value determined to increase asymmetry of the asymmetric signal constellation. Signal acquisition may be improved by transmitting, at the transmitter, transmissions, based on transmitting using the determined transmitter adjustment value.