Implementation of a real-time ISDB-T_B LDM receiver using SDR

Implementation of a 3-layer LDM Broadcast System Backward-compatible with ISDB-TB

“…Still on the perspective of the Cloud Txn concept, a first proposal was presented by [20] which used ISDB-T B in the UL. Later studies were published using LDM nomination and some new characteristics such as the introduction of LDPC codes in the LL [21], an implementation using diversity at reception in order to improve robustness [22], [23], an ISDB-T B LDM system with the BICM stage of ATSC 3.0 in the LL and diversity at reception [24] and a real-time ISDB-T B LDM receiver using SDR [16].…”

“…In this work, the main idea is to transmit and receive three signals divided into layers using different power levels, at the same time and frequency. Its working is similar to the traditional 2-layer LDM broadcast system proposed by [16], with the addition of a third layer (ML) in the system, in order to verify bit rate and robustness improvements.…”

“…Figure 1 [16] shows the 3-layer LDM transmitter used in this work. Some of digital signal processing stages were used in [16], such as the ISDB-T B BICM, the time and frequency interleaving, the framing, the Orthogonal Frequency Division Multiplexing (OFDM) modulation and the Guard Interval (GI) insertion. At the input of each BICM stage, a respective Transport Stream (TS) file is inserted.…”

“…The purpose of this work is to develop a transmitterreceiver couple, using Software Defined Radio (SDR), that is a new perspective of the modified version of ISDB-T B LDM created by [16] which uses a 3-layer LDM system with ISDB-T B BICM in the Upper Layer (UL) [17], [18] and a BICM stage with modified LDPC encoders/decoders, bit interleavers/deinterleavers, costumed frame size and softdecision demodulators in the Middle Layer (ML) and the Lower Layer (LL). This model allows for the transmission of a modified DTV standard, using the ML and LL, as well as the ISDB-T B transmission, in the UL, producing a backward-compatible system, that can be used in a transition process between DTV generations.…”

Implementation of an 8K-DTV broadcast system using SDR

“…There are some studies such as [13]- [15], which demonstrate the use of modern modulation techniques, coding and multiplexing, so that it could reach a higher bit rates (to allow the transmission of 4K content in the enhanced layer) and still allow transmission of the traditional ISDB-T B in the core layer using the Layer Division Multiplexing (LDM) technique. The main advantages of this method are the efficient spectrum use and the increase in the amount of data transmitted [16].…”