English to Greek Tech/Engineering Telecom(munications)

Instead of using power control to compensate for rapidly varying radio conditions in the downlink, HS-DSCH relies on rate adjustment. That is, while keeping transmission power constant, it adjusts the data rate by changing the channel-coding rate. Commonly known as rate adaptation or link adaptation, this method is more efficient than power control for services that tolerate short-term variations in the data rate. What is more, to further increase peak data rates, HS-DSCH can use spectral-efficient 16QAM modulation when channel conditions permit.