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In recent years, with emerging applications such as multimedia sensors networks, wireless low-power surveillance and mobile camera phones, the traditional video coding architecture in being challenged. In fact, these applications have different requirements than those of the broadcast video delivery systems: a low power consumption at the encoder side is essential. In this context, we propose a pixel-domain...
Generally, the major part of communication systems use Turbo Codes (TC) and/or Low-Density Parity-Check (LDPC) codes to protect the data to transmit (e.g. 3GPP-LTE, IEEE 802.11p, IEEE 802.16, etc). Given that these coding strategies share similarities (e.g. two stage iterative decoding, Log-Likelihood Ratio based, etc.) in their respective encoding and decoding parts it is possible to express one...
The distributed turbo coding (DTC) with the combined diversity and coding gain has been proven to be an effective coding strategy to approach the capacity of relay networks. In this paper, a novel DTC scheme is proposed to further improve the diversity and coding gain, which can be applied to two-hop relay networks. At the relay, this scheme first computes the log-likelihood ratios (LLRs) of bits...
To meet the requirements of the COFDM (coded orthogonal frequency division multiplexing) wireless video transmission system for real-time and high-quality transmission of video signals, in this paper, we take Turbo code as the channel coding of COFDM system because of its superior performance. COFDM wireless video transmission system is briefly described at first, then detailed describe the encoding...
In recent years, with emerging applications such as multimedia sensors networks, wireless low-power surveillance and mobile camera phones, the traditional video coding architecture in being challenged. In fact, these applications have different requirements than those of the broadcast video delivery systems: a low power consumption at the encoder side is essential. In this context, we propose a pixel-domain...
An investigation of joint source channel decoding (JSCD) methods using BPSK modulation applied to a vector quantization of compressed sub band coded source in Communication Network is presented. The proposed decoding scheme designed a feedback algorithm using error-detected source information to improve the error correction capability of the Turbo Log-MAP decoder without changing its constituent decoder...
The iterative receiver for BICM embedded turbo codes is considered. In a simple iteration scheme, the two RSC decoders are treated as a single component. The demapper only takes the priori information from the second RSC decoder to generate new soft outputs for the first RSC decoder. However, this scheme gets worse BER performance with simple computation complexity. In the conventional iteration scheme,...
Recently, a turbo-coded noncoherent space-time modulation scheme, which is aimed at providing both a high data transmission rate and a low receiving complexity, was proposed for noncoherent block fading channels. However, in cases where a large number of transmit antennas exist, the turbo code does not match well with the noncoherent space-time modulation scheme, and results in performance degradation...
An improved iterative decoder (IID) for 3-node decode-and-forward (DF) relay channels employing distributed turbo trellis coded modulation (DTTCM) schemes which takes into account the decoding errors at the relay is proposed. The principle idea is to modify the extrinsic information between the component decoders to eliminate the effect of error propagation between the decoders, depending on the channel...
Because of its proximity to Shannon limit error-correcting ability, Turbo codes have attracted great attentions. Its excellent error correction performance has become an important research in the field of channel coding. We introduce Turbo codes into the error correction mechanism of the DVB-T system, and then use MATLAB to simulate the improved correction mechanism. Simulation results show that the...
This article consists of a collection of slides from the author's conference presentation on AMD's core processor and media accelerator products. Some of the specific topics discussed include: AMD products' core architecture and system platforms; media accelerators system specifications; the AMD APU "trinity" of products that include Piledriver core, and media acceleration and enhanced display...
Turbo codes are the most exciting and potentially important development in the coding theory and it has already entered the field of practical application. The most important and foremost design issue prior to the implementation of soft decoder for such turbo code is the estimation of bits required to represent the quantized soft log-likelihood ratio (LLR), internal metrics and extrinsic information...
Multi-Carrier Code Division Multiple Access techiques is a combination of two radio access techniques: Code Division Multiple Access (CDMA) and Orthogonal Frequency-called Division Multiplexing (OFDM) and has the advantages of both techniques. The paper presents the design of transmitter and receiver for MC-CDMA radio interface and the simulation results of the transmission quality in AWGN channel.
This paper presents an extrinsic data compression method for double-binary turbo codes. Frame and extrinsic data memory occupy more area in turbo decoder implementations with the frame size increasing. Besides, non-binary turbo codes have much more extrinsic memory usage than single-binary turbo codes. This proposed compression method utilizes an operation in radix-4 single-binary turbo decoder and...
Terrestrial Trunked Radio (TETRA) is a digital trunked mobile radio standard developed by the European Telecommunications Standards Institute (ETSI). Especially, TETRA 2 supports different channel bandwidths and modulation techniques, and turbo code has been adopted as a channel code with powerful error correcting capability. In this paper, to lower the implementation cost of Takeshita-Costello interleaver...
Serial Concatenation of Interleaved Codes (SCICs) is emerging as a promising technology to improve the physical layer (PHY) performance of modern wireless communication systems in terms of bit-error rate (BER), mainly due to their outstanding coding gains and feasible decoding complexities. For their channel coding performance, an interleaver is a critical component since the Minimum Hamming Distance...
A novel method to combine encryption and channel coding in such a way as to get increased security without any additional complexity is presented in this paper. A secure communication system usually consists of an encryption block followed by the channel coder. The encryption block here is a Shrinking generator which is a Linear Feedback Shift Register (LFSR) based stream cipher system. The channel...
We propose a scheme of utilizing multilevel space-time signal-based turbo code (MST-SB-TC) for wireless communication systems with multiple antennas over very rapidly Rayleigh block fading channels where the fading coefficients changes independently for every transmitted signal. No channel state information (CSI) is available and even unitary space-time signals fail to operate. We give an effective...
Hybrid automatic repeat request (HARQ) is a well-known technique for improving system throughput and link performance of wireless communication systems, including cooperative communication systems. In this paper, we exploit the limited feedback applied to the two-source turbo coded cooperation scheme to define a particular cooperative HARQ protocol, called two-level HARQ, where the decision on retransmission...
3GPP long term evolution (LTE) Turbo coded modulation is well-known for its excellent error-control capability. However, its decoding threshold is still a few decibels away from the constellation-constrained capacity. In this paper, an irregular mapping scheme involving labeling search is proposed to improve the performance of the LTE system. The scheme first predetermines one labeling, and then searches...
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