Convergence Analysis and Optimal Scheduling for Multiple Concatenated Codes

Brännström, Fredrik; Rasmussen, Lars K.; Grant, Alex

doi:10.1109/tit.2005.853312

Cited by 162 publications

(156 citation statements)

References 12 publications

Supporting

Mentioning

155

Contrasting

Order By: Relevance

“…The outer decoder system setup is shown in Figure 4. The modulo-two sum code bits of users is represented by c, which are modelled as random independent Gaussian distributed variables with a mean value of σ 2 L /2 and a variance of σ 2 L to form the decoder input in terms of LLRs, L c a [31]. The decoder employs the maximum a posteriori algorithm in the logarithm domain (Log-MAP) to provide information about the source bits.…”

Section: Setup Exit Functionmentioning

confidence: 99%

BICM-ID with Physical Layer Network Coding in TWR Free Space Optical Communication Links

2017

View full text Add to dashboard Cite

Physical layer network coding (PNC) is a promising technique to improve the network throughput in a two-way relay (TWR) channel for two users to exchange messages across a wireless network. The PNC technique incorporating a TWR channel is embraced by a free space optical (FSO) communication link for full utilization of network resources, namely TWR-FSO PNC. In this paper, bit interleaved coded modulation with iterative decoding (BICM-ID) is adopted to combat the deleterious effect of the turbulence channel by saving the message being transmitted to increase the reliability of the system. Moreover, based on this technique, comparative studies between end-to-end BICM-ID code, non-iterative convolutional coded and uncoded systems are carried out. Furthermore, this paper presents the extrinsic information transfer (ExIT) charts to evaluate the performance of BICM-ID code combined with the TWR-FSO PNC system. The simulation results show that the proposed scheme can achieve a significant bit error rate (BER) performance improvement through the introduction of an iterative process between a soft demapper and decoder. Similarly, Monte Carlo simulation results are provided to support the findings. Subsequently, the ExIT functions of the two receiver components are thoroughly analysed for a variety of parameters under the influence of a turbulence-induced channel fading, demonstrating the convergence behaviour of BICM-ID to enable the TWR-FSO PNC system, effectively mitigating the impact of the fading turbulence channel.

show abstract

Section: Setup Exit Functionmentioning

confidence: 99%

BICM-ID with Physical Layer Network Coding in TWR Free Space Optical Communication Links

2017

View full text Add to dashboard Cite

show abstract

“…where the mapping-specific parameters are H 1 = 0.3073, H 2 = 0.8935, and H 3 = 1.1064, which are obtained by leastsquared curve fitting [13]. Furthermore, the inverse function of (6) is given by…”

Section: B Signal Modelmentioning

confidence: 99%

“…Furthermore, since we have B i = exp(γ i ), (13) and (14) may be rewritten as Figure 3 shows on EXIT chart analysis model. Based on (6) representing the variance of the LLR-to-MI conversion, the LLRs α i , β i and γ i are transformed to the corresponding MI, which are denoted by I α i , I β i and I γ i , respectively.…”

Section: A Iterative Decoding Of the Jcn Codesmentioning

confidence: 99%

Joint channel-and-network coding using EXIT chart aided relay activation

Ibi

Sampei

Hanzo

2011

2011 IEEE Wireless Communications and Networking Conference

View full text Add to dashboard Cite

Abstract-This paper presents a relay activation scheme designed for joint channel-and-network (JCN) coded systems relying on an iterative decoding. A primary focus is on proposing criteria of the relay activation to find the best user combination for cooperative relaying, which exploits extrinsic information transfer (EXIT) chart analysis. We will demonstrate that the EXIT chart aided relay activation scheme is capable of reducing the probability of outages, despite increasing the effective throughput of network.Index Terms-User cooperation, network coding, channel coding, iterative decoding, multi-hop, cooperative relaying, EXIT chart analysis. I. INTRODUCTIONUser cooperation has attracted significant research attention owing to its spatial diversity benefits [1], [2]. Relaying or multi-hop transmissions constitute the simplest form of user cooperation. However, due to the creation of the broadcast and cooperation phases, they achieve a high diversity gain at the cost of a factor two multiplexing loss. To overcome this deficiency, the adoption of network coding has been studied, where we multiplex several users' information by their algebraic superposition over a finite field [3], [4]. As a benefit of the network coding, the above-mentioned half duplex multiplexing loss is mitigated without sacrificing the diversity gain. The designs of joint channel-and-network (JCN) codes and their iterative detection have been investigated in [5]-[7]. In [5], a simple triangular topology conceived for two-user cooperation was combined with beneficial channel codes. As further advances, two-way relay channels (TWRC) and multiple-access relay channels (MARC) were investigated in [6] and [7], respectively, where a turbo-like code was constituted for transmissions over the TWRC and MARC in order to achieve a high diversity gain.The primary focus of this paper is on finding beneficial relay activation criteria for a simple triangular topology. In sophisticated JCN coded systems, extrinsic information transfer (EXIT) chart analysis may be involved for visualizing the convergence behavior of the iterative detection scheme [8], [9]. Against this background, the novel contribution of this treatise is that an EXIT-chart-aided relay activation scheme is proposed for a low-complexity XOR assisted JCN code.

show abstract

“…2 allows us to decouple the effects of systematic bits, outer parity bits and inner parity bits on the performance. A similar description of serially concatenated codes was used in [9] and [10] for convergence analysis and in [6,7] for deriving upper bounds on the error probability.…”

Section: Designsmentioning

confidence: 99%

“…Here, the optimization of the puncturing patterns and the permeability rates is based on both upper bounds assuming uniform interleavers, and on EXIT functions assuming infinite interleavers. The design procedure based on EXIT functions is also suggested in [9,13] for multiple concatenated codes. The permeability rates are there optimized in terms of minimizing the convergence threshold in the WF region, i.e., minimizing the required SNR to reach a specific target BER.…”

Section: Code Design Criteriamentioning

confidence: 99%

On the design of rate‐compatible serially concatenated convolutional codes

Amat

Brännström

Rasmussen

2007

Trans Emerging Tel Tech

View full text Add to dashboard Cite

Recently a powerful class of rate-compatible serially concatenated convolutional codes (SCCCs) have been proposed based on minimizing analytical upper bounds on the error probability in the error floor region. Here this class of codes is further investigated by combining analytical upper bounds with extrinsic information transfer charts analysis. Following this approach, we construct a family of rate-compatible SCCCs with good performance in both the error floor and the waterfall regions over a broad range of code rates.

show abstract

Convergence Analysis and Optimal Scheduling for Multiple Concatenated Codes

Cited by 162 publications

References 12 publications

BICM-ID with Physical Layer Network Coding in TWR Free Space Optical Communication Links

BICM-ID with Physical Layer Network Coding in TWR Free Space Optical Communication Links

Joint channel-and-network coding using EXIT chart aided relay activation

On the design of rate‐compatible serially concatenated convolutional codes

Contact Info

Product

Resources

About