METHOD AND DEVICE FOR DATA MODULATION AND COMMUNICATION EQUIPMENT

摘要

PROBLEM TO BE SOLVED: To accurately detect a synchronizing signal of a communication system being used even when different communication systems coexist. SOLUTION: This device is related to synchronization and a training preamble, and a reference symbol optimized so as to include a structure of 'IA-A-IA- A-A-IA-A-IA-IA' is allocated to the subcarrier of an OFDM symbol. That is, the device can reliably be distinguished from other communication systems by devising the preamble configuration of a time domain while maintaining the accuracy of time synchronization. Furtherer, the device adopts a sequence where the peak average ratio and dynamic range of a synchronous symbol that uses an OFDM are low. The device has an advantage of increasing the versatility of an LSI chip because a generation device and a detection device of a synchronous preamble used in the conventional system can also be used as they are for performing generation and detection. A synchronous sequence that is divided into two parts A and B in the conventional practice is put together to be a single B area to provide a simple configuration.