Amplify-forward and decode-forward cooperation relying on systematic Luby transform coded hybrid automatic-repeat-request

نویسندگان

  • Hoang Anh Ngo
  • Thanh Dang Nguyen
  • Lajos Hanzo
چکیده

Systematic Luby transform (SLT) codes constitute rateless codes, which are capable of adaptively adjusting their code rate depending on the channel quality without any explicit channel state information (CSI) at the transmitters. SLTs are also suitable for space time collaboration-aided relay networks. In this study, an iterative decoding-aided SLT scheme is combined with 16 quadrature amplitude modulation (QAM) transmission in a wireless relay-aided network. The bit error ratio (BER) results and extrinsic information transfer (EXIT) charts are provided to evaluate the performance of the proposed scheme. The simulation results show that the proposed scheme using amplify-and-forward (AF) relaying achieves a 2.5 dB gain at a BER of 10, while the attainable improvement is nearly 6 dB for decode-and-forward (DF) relaying, compared to the noniterative detection scheme operating without the relay’s assistance. Moreover, the AF relaying-aided SLT coded 16-QAM scheme is more beneficial, when the relay station is close to the source. By contrast, the DF relaying performs best near the mid-point between the source and the destination. Additionally, a modified Hybrid Automatic-Repeat-reQuest (HARQ) protocol using incremental redundancy is applied along with the SLT-coded 16-QAM scheme in order to enhance the achievable throughput and energy efficiency of cooperative networks. This arrangement reduces the total transmit power by about 5%, compared to the classic HARQ scheme.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

H-ARQ-Aided Systematic Luby Transform Codes

Hybrid Automatic-Repeat-Request (H-ARQ) Aided Systematic Luby Transform (SLT) Coded Modulation is proposed, where SLT codes are used both for correcting erroneous bits and for detecting as well as retransmitting erroneous Internet Protocol (IP) based packets. Erroneous IP packet detection is implemented using syndrome checking with the aid of the SLT codes’ Parity Check Matrix (PCM). Optimizing...

متن کامل

Performance Analysis of Hybrid Coded Cooperation in Wireless Networks

Relay-assisted transmission schemes for wireless networks are continuing to grow because of their potential of providing the benefits of space diversity. This paper applies hybrid relaying protocols to coded cooperation which is a combined scheme of user cooperation and channel codes. The hybrid relaying protocol adaptively uses the amplify-and-forward and decode-and-forward whether a relay dec...

متن کامل

Rateless Coding over Wireless Relay Networks Using Amplify/Decode and Forward Relays

In this paper two different rateless transmissionschemes are developed. In the proposed scheme, relay node candecode and forward the message to the destination if they areable to decode it, or amplify and forward the message to thedestination. Based on the analysis and simulation resultsprovided in this paper, the proposed method has bettertransmission time than the scheme which only the relay ...

متن کامل

Bit per Joule Achievable Rate of Cooperative Sensor Networks with Hybrid ARQ

Cooperation in wireless networks has been recently considered as a technique to increase the network throughput. However, for sensor networks with limited available energy, this benefit may come at the expense of a increased energy consumption due to the simultaneous transmission by many nodes. In this paper we consider the bit per Joule achievable rate (AR) as a performance measure of a cooper...

متن کامل

Cooperative Hybrid ARQ Protocols: Unified Frameworks for Protocol Analysis

Cooperative hybrid-ARQ (HARQ) protocols, which can exploit the spatial and temporal diversities, have been widely studied. The efficiency of cooperative HARQ protocols is higher than that of cooperative protocols, because retransmissions are only performed when necessary. We classify cooperative HARQ protocols as three decode-and-forward based HARQ (DF-HARQ) protocols and two amplified-and-forw...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • IET Communications

دوره 5  شماره 

صفحات  -

تاریخ انتشار 2011