scholarly journals Fixed Reception Performance of FDM-based Transmission System for Advanced ISDB-T

2020 ◽  
Vol 2020 (6) ◽  
pp. 9-20
Author(s):  
Takuya Shitomi ◽  
◽  
Shingo Asakura ◽  
Shogo Kawashima ◽  
Akihiko Sato, ◽  
...  
Keyword(s):  
Channel Coding ◽  
Forward Error Correction ◽  
Transmission System ◽  
Coded Modulation ◽  
Transmission Capacity ◽  
Frame Structure ◽  
Modulation Scheme ◽  
High Spectral Efficiency ◽  
Digital Terrestrial Television ◽  
T System

With the aim of improving the quality and expanding the functions of digital terrestrial television broadcasting services, we have been developing an advanced transmission system that inherits key features of the current Integrated Services Digital Broadcasting-Terrestrial (ISDB-T) system, which employs hierarchical transmission based on frequency division multiplexing (FDM) and a segment structure. The advanced ISDB-T system has a new signal frame structure that enables bandwidth to be flexibly allocated to multiple services for different reception scenarios, such as fixed reception and mobile reception, compared with ISDB-T. By introducing transmission technologies such as the latest forward error correction and modulation scheme, this specification has high spectral efficiency and transmission robustness, i.e., the transmission capacity increases by about 10 Mbps for the same required carrier to noise ratio (CNR) in comparison with the current ISDB-T system, or the required CNR can be reduced by about 7 dB for the same transmission capacity. We describe the channel coding scheme and evaluated the performance of bit-interleaved coded modulation (BICM) in simulations. This paper provides a BICM selection guideline based on the simulation results for fixed reception scenarios toward the practical application of advanced ISDB-T.

scholarly journals Implementation of a standard inner convolutional codec for DVB-T system using VHDL

2017 ◽  
Vol 6 (4) ◽  
pp. 131
Author(s):  
Dina M. Hussein ◽  
Abdelhalim Zekry ◽  
Said Baioumy ◽  
Fatma El-Newagy
Keyword(s):  
Channel Coding ◽  
Communication Systems ◽  
Forward Error Correction ◽  
Vital Role ◽  
Viterbi Decoder ◽  
Error Protection ◽  
Digital Terrestrial Television ◽  
Forward Error ◽  
Convolutional Encoder ◽  
T System

Forward error correction (FEC) plays a vital role in digital communication systems. DVB-T system uses FEC as a channel coding technique to restore any data lost through transmission to the receiver. DVB-T system uses two levels of error protection. The first level is applied in the data transmitted by using a Reed-Solomon RS (204, 188) code followed by a convolutional interleaver. The other level of error protection is a punctured convolutional inner coding followed by an inner interleave in which the data sequence is rearranged again to minimize the influence of burst errors.This paper describes the implementation of inner convolutional codec (Convolutional coder and Viterbi Decoder) and inner de/interleaving of a standard DVB-T system with a constrained length of 7 and a code rate of 2/3 using VHDL on virtex-6 FPGA xc6vlx240t. The designed channel convolutional encoder and Viterbi decoder follow European Standard ETSI EN 300 744 for digital terrestrial television. Verification of the design is accomplished by loop back and by comparison with the corresponding Xilinx core. Utilization and timing re-ports of the implemented device on Vertex 6 are included.

A Near-Capacity MIMO Coded Modulation Scheme for Digital Terrestrial Television Broadcasting

2015 ◽  
Vol 61 (3) ◽  
pp. 367-375 ◽  
Author(s):  
Tao Cheng ◽  
Kewu Peng ◽  
Fang Yang ◽  
Jian Song ◽  
Zhixing Yang
Keyword(s):  
Coded Modulation ◽  
Modulation Scheme ◽  
Television Broadcasting ◽  
Digital Terrestrial Television

scholarly journals Improving the performance of BICM-ID and MLC systems with different FEC codes

2013 ◽  
Vol 11 ◽  
pp. 87-93 ◽  
Author(s):  
T. Arafa ◽  
W. Sauer-Greff ◽  
R. Urbansky
Keyword(s):  
Turbo Codes ◽  
Channel Coding ◽  
Communication Systems ◽  
Forward Error Correction ◽  
Convolutional Codes ◽  
Coded Modulation ◽  
Modulation Formats ◽  
Coding Schemes ◽  
Multilevel Modulation ◽  
Exit Charts

Abstract. In bandwidth limited communication systems, the high data rate transmission with performance close to capacity limits is achieved by applying multilevel modulation schemes in association with powerful forward error correction (FEC) coding, i.e. coded modulation systems. The most important practical approaches to coded modulation systems are multilevel coding with multistage decoding (MLC/MSD) and bit interleaved coded modulation with iterative demapping and decoding (BICM-ID). Multilevel modulation formats such as M-QAM, which can be used as a part of coded modulation systems, have the capability of multilevel protection. Based on this fact, we investigate the methods to improve the performance of BICM-ID using multiple interleavers with different binary channel coding schemes such as convolutional codes, turbo codes and low-density parity-check (LDPC) codes. Moreover, an MLC system with parallel decoding on levels (PDL) at the receiver is considered. In our contribution, we propose to design the individual coding schemes using the extrinsic information transfer (EXIT) charts for individual bit levels in the constellation. Our simulation results show that the BICM-ID systems, taking into account different bit-level protections, can provide an improvement of 0.65 dB, 1.2 dB and 1.5 dB for 256-QAM with turbo, LDPC and convolutional codes, respectively. On the other hand, MLC systems with PDL designed using EXIT charts for individual bit levels can slightly improve the performance and eliminate the error floor compared to the systems with MSD.

On Application of LDPC Coded Modulation in Optical Fiber Communication

2012 ◽  
Vol 605-607 ◽  
pp. 1980-1983
Author(s):  
Zhong Xun Wang ◽  
Peng Xiang Wang
Keyword(s):  
Optical Fiber ◽  
Forward Error Correction ◽  
Ldpc Codes ◽  
Optical Fiber Communication ◽  
Coded Modulation ◽  
Modulation Scheme ◽  
Fiber Communication ◽  
Modulation Format ◽  
Simulation Results ◽  
Forward Error

In order to meet the demand for higher capacity transmission over optical fiber communication, we propose a new LDPC coded modulation scheme. Using spectrally-efficient modulation format and LDPC codes, the proposed scheme offers an advanced forward error correction (FEC) solution. From the simulation results, we can get the SNR at the bit error rate (BER) of 10-7 as 3.8dB, 5.5dB, and6.9dB when 16-, 32-, and 64-points constellations are used, respectively.

scholarly journals TDS-OFDM based Digital Television Terrestrial Multimedia Broadcasting Standards

2020 ◽  
Vol 2020 (6) ◽  
pp. 38-49
Author(s):  
Jian Song ◽  
Chao Zhang ◽  
Jintao Wang ◽  
Yonglin Xue ◽  
Changyong Pan ◽  
...  
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
First Generation ◽  
Spectrum Efficiency ◽  
Frame Structure ◽  
Single Frequency ◽  
Digital Television ◽  
Modulation Scheme ◽  
High Definition ◽  
Wide Range ◽  
Digital Terrestrial Television

As the most popularly utilized broadcasting network, digital terrestrial television broadcasting (DTTB) can provide multimedia information coverage for the broad audience in a very efficient way because of its characteristic of wide-range coverage and mobile reception ability. After promulgating the first generation DTTB standard, digital terrestrial/television multimedia broadcasting (DTMB), in 2006, China began to research and develop the next generation DTTB standard, namely DTMB-advanced (DTMB-A), aiming to support higher spectrum efficiency and further improve transmission reliability. In 2019, DTMB-A was accepted by ITU as the second generation international DTTB standard (as System C). Similar to DTMB, time-domain synchronous - orthogonal frequency division multiplexing (TDS-OFDM) based multi-carrier modulation scheme is adopted by DTMB-A. Thanks to the more flexible frame structure, advanced error correction coding and improved constellation mapping, DTMB-A offers 30% higher transmission capacity than DTMB under the same transmission conditions. Thus, DTMB-A can support both fixed and mobile reception more efficiently, and provide users with higher quality services such as ultra-high definition television (UHDTV). This paper first gives details of key technologies at the transmitter of DTMB/DTMB-A and introduce core algorithms at the receiver. Both laboratory test and field trial results will then be provided and analyzed, especially for the application of 4K UHDTV and single frequency network (SFN).

A Novel Turbo Coded Modulation Scheme for Deep Space Optical Communications

2010 ◽  
Vol E93.B (5) ◽  
pp. 1260-1263 ◽  
Author(s):  
Sangmok OH ◽  
Inho HWANG ◽  
Adrish BANERJEE ◽  
Jeong Woo LEE
Keyword(s):  
Optical Communications ◽  
Coded Modulation ◽  
Modulation Scheme ◽  
Deep Space ◽  
Turbo Coded Modulation

scholarly journals Performances of BICM-ID system using CRSC code in optical transmissions

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Hocine Fekih ◽  
Boubakar Seddik Bouazza ◽  
Keltoum Nouri
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Iterative Decoding ◽  
Optical Transmission ◽  
Coded Modulation ◽  
Modulation Scheme ◽  
Coding Gain ◽  
Decoding Algorithms ◽  
Qam Modulation ◽  
Short Code

AbstractRecently, using iterative decoding algorithms to achieve an interesting bit error rate for spectrally efficient modulation become a necessity for optical transmission, in this paper, we propose a coded modulation scheme based on bit interleaving circular recursive systematic convolutional (CRSC) code and 16-QAM modulation. The proposal system considered as a serial concatenation of a channel encoder, a bit interleaver and M-ary modulator can be flexible easy to implement using a short code length. For a spectral efficiency $\eta =3\text{bit}/s/Hz$, the coding gain at a bit error rate of 10−6 is about 8 dB.

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