References in periodicals archive ?
Iran, China, India and even Afghanistan has moved to digital broadcasting, most using DRM and DRM plus technologies which use less electrical power but give better audio output.
Its Robustness Mode E, known as DRM Plus, has been standardized in September 2009 by European Broadcasting Union (EBU) to cover Band I and Band II (47 to 174 MHz).
In [12], the authors proposed a joint detection method for the transmission frame and the inversed spectrum signal in DRM Plus, and focused on the detection performance with the assumption of less symbol timing offset.
In this paper, we propose a joint method for fast initial synchronization--transmission frame detection and integer carrier frequency offset estimation--and spectrum inversion detection in DRM Plus systems.
Section 2 describes the OFDM based DRM Plus parameters and the received OFDM signal with oscillator differences between the transmitter and receiver.
For the DRM Plus system, the duration of one transmission super frame is 400 ms, which consists of four 100 ms frames.
The DRM Plus system distinguishes three kinds of reference cells for channel estimation and synchronization: Time Reference Cell (TRC), Gain Reference Cell (GRC), and AFS reference cell.
Table 1 shows OFDM symbol parameters for DRM Plus transmission.
There are 21 time reference cells and 13 gain reference cells in the first DRM Plus symbol.
In this paper, we propose a joint detection method for frame, integer carrier frequency offset, and spectrum inversion for DRM Plus digital broadcasting systems using the difference among reference cells of the first OFDM symbol in the transmission frame.
3 illustrate the signal losses when the received signal is the OFDM symbol of the frame with the sampling frequency offset and the frequency offset for the DRM Plus system according to the symbol index after the signal detection.
The DRM Plus signal generator is used as a transmitter.