Demodulation Algorithm and Its Improved Effect in Mobile Reception Environment for Digital Radio Receiver

Abstract

Broadcasting receivers with receiving function for digital radio service have been developed recently in the world. Especially DAB (Digital Audio Broadcast) as digital radio broadcasting standards with various service platforms is widely deployed in many countries. In DAB system, DQPSK is specified as modulation scheme and it has a general problem of deteriorating symbol error rate compared to that of synchronous detection. This is caused that demodulation method for DQPSK must be operated by using both noised received signal and noised delayed signal. Therefore, we propose a new demodulation method with simple signal processing, and also reveal that our method can obtain the advantageous effect in BER improvement effect under noisy and mobile reception environment.