Frequency division multiplexing system and method having a dynamically operating parameters that can be increased or decreased regulation

摘要

PROBLEM TO BE SOLVED: To provide a flexible OFDM(orthogonal frequency division multiplexing) system which can provide the OFDM advantages to various types of communication environments by adding the increase/decrease control (scaling) to the OFDM system about its operating parameter or characteristic and accordingly improving the flexibility and adaptability of the OFDM system. ;SOLUTION: A dynamic rate control circuit 15 responds to the optional one of conceivable inputs in order to set a coding block 14 at an appropriate coding rate. In an execution example of a transceiver, for example, the circuit 15 detects a transmission error through the feedback caused from a receiver and dynamically reduces the coding rate. In the same way, the circuit 15 controls the number of bits per symbol for each carrier wave to respond to various inputs. In such a constitution, an OFD system can work in various communication environments where various operating parameters or characteristics are required.;COPYRIGHT: (C)1998,JPO