Which statement about MCPC is accurate? (Alternative formulation to test MCPC vs VCM.)

• A. MCPC uses adaptive modulation per channel.
• B. MCPC uses a single modulation and coding for all channels.
• C. MCPC is used only for uplink channels.
• D. MCPC cannot be used with forward error correction.

Answer: (B)

The accurate statement is that MCPC uses a single modulation and coding scheme for all channels carried on a given carrier. In MCPC, every channel on that carrier shares the same modulation (for example, QPSK, 8PSK) and the same forward error correction rate, which keeps the transmission uniform and simplifies transmitter/receiver design. This approach trades flexibility for simplicity and uniform protection, since it cannot tailor the modulation and coding to the differing conditions of each channel. By contrast, per-channel adaptation of modulation and coding is a feature of VCM, which allows different channels to use different MCS to optimize throughput under varying link conditions. The other statements aren’t correct because MCPC is not about adaptive per-channel modulation, it isn’t limited to uplink only, and it is used with forward error correction.