Large baud rates put more constraints on the equalizer because of less favorable channel characteristics due to the wider bandwidth. All these demand better design and larger precision for V.34 implementation. This means that more computational effort is needed. Framing technology is used for synchronization mandated by shell mapping and multidimensional trellis codes. The handling of the data stream for V.34 is much more complex and totally different from previous modems.
Shell mapping is a new feature that requires complex computation.
The generation and detection of line-probing signals, the modulation and demodulation of the information sequence, as well as the generation and detection of these sequences are all new features and need to be carefully designed. The greatest demand on computation for V.34 implementation comes from the decoding of the new trellis codes.