Symbol timing determining device and method

A symbol timing determining device capable of preventing erroneous symbol timing synchronization of a communication system, the symbol timing determining device comprising:

• a symbol timing detecting circuit configured to detect a reception signal to obtain a first symbol timing and configured to shift the first symbol timing to obtain a second symbol timing;
• an estimation signal generating circuit configured to process the reception signal according to the first symbol timing to obtain a first channel estimation frequency-domain signal, and configured to process the reception signal according to the second symbol timing to obtain a second channel estimation frequency-domain signal;
• a channel impulse response signal generating circuit configured to generate a first channel estimation impulse response time-domain signal according to the first channel estimation frequency-domain signal, and configured to generate a second channel estimation impulse response time-domain signal according to the second channel estimation frequency-domain signal;
• a power measuring circuit configured to measure first energy of the first channel estimation impulse response time-domain signal according to a first predetermined signal region of the first channel estimation impulse response time-domain signal, and configured to measure second energy of the second channel estimation impulse response time-domain signal according to a second predetermined signal region of the second channel estimation impulse response time-domain signal;
• and
• a decision circuit configured to adopt one of the first symbol timing and the second symbol timing by determining whether a relation between the first energy and the second energy conforms to a predetermined relation.