New ARQ protocols using concatenated codes

The size of network and internet traffic is rising spontaneously by the day, with data usage at zettabyte to petabyte scale at an exponential high rate and therefore considered to generate huge traffic along the way which causes the chance of error in transmission to be high as well. Automatic Repeat Request (ARQ) protocol is an error control function for data transmission that uses acknowledgements. These protocols exist in Data link or Transport layers. ARQ is categorize into three major types such as Stop and wait, Go Bank N and Selective Repeat. Hybrid automatic repeat (HARQ) request which is an advancement to earlier mentioned protocols to detect error via cycle redundancy check was later developed. This paper evaluates the performance of these basic ARQs and HARQ protocols in consideration of the current state of high signal interference and collision during competitive accesses, more especially in highly densely networks.

IEEE Real Time Technology and Applications Symposium, 2002

The concept of deadline dependent coding (DDC) has previously been suggested by the authors for maximizing the probability of delivering the required information before a given deadline in a wireless communication system. In this paper, these principles are further developed using concatenated codes with iterative decoding, providing a new level of flexibility and robustness for DDC protocols. The strategy of

This papers presents an overall look at the ARQ (automatic repeat request) protocol of a network system the different protocol’s we have and the recent ones used for different network system

1996 8th European Signal Processing Conference (EUSIPCO 1996), 1996

Mobile communication channels are frequently plagued by severe noise and disturbances such as multipath fading and doppler effects that severely degrade performance. Among the automatic-repeat-request (ARQ) protocols used to improve the communication channel reliability, the stop-and-wait (SW) is positively characterized by simple implementation and negatively by low throughputs. This work describes the application of some new SW protocols that retain the simple implementation of the classical SW schemes, while reducing the transmitter's wait state time to increase throughput. The performance of the modified SW protocols, derived through computer simulations, is shown to be comparable to that of more complex ARQ protocols.

Ieee Transactions on Computers, 2007

Forward error control (FEC) and Automatic-repeat request (ARQ) are two main techniques used for reliable data transmission in computer and communication systems. In this paper, some simple, low cost error control techniques for ARQ protocols used with binary unidirectional channels are described. The proposed schemes can correct up to b t 2 c unidirectional errors using t-unidirectional error detecting codes and code combining with a much smaller number of retransmissions. First, we show how to do code combining for unidirectional errors. To use code combining with unidirectional codes, we need to identify the type of error (0 ! 1 or 1 ! 0) from the received word. We show how this can be done for various unidirectional codes.

IEEE Communications Magazine, 1984

Error detection incorporated with automatic-repeat-request (ARQ) is widely used for error control in data communication systems. This method of error con trol is simple and provides high system reliability. if a properly chosen code is used for error detection, virtually error-free data transmission can be attained. This paper surveys various types of ARQ and hybrid ARQ schemes, and error detection using linear block codes.

1977

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A protocol for real-time communication over a wireless channel, based on concatenated codes using iterative decoding is proposed. The concept of deadline dependent coding (DDC), previously suggested by the authors, to maximize the probability of delivering the information before a given deadline, is further developed to include concatenated codes. The strategy of DDC is to combine different coding and decoding methods with automatic repeat request (ARQ) in order to fulfill the application requirements. These requirements are formulated as two Quality of Service (QoS) parameters: deadline (tDL )a nd probability of correct delivery before the deadline ( Pd), leading to a probabilistic view of real-time communi- cation. An application can negotiate these QoS parame- ters with the DDC protocol, thus creating a flexible and reliable scheme.

IEICE Communications Express, 2014

N-channel stop-and-wait (SW) hybrid automatic repeat request (HARQ) protocol is widely used in wireless communication systems due to its simplicity and high efficiency. However, different HARQ processes are transmitted over sub-channels with individual encoding. We present a joint coding HARQ scheme in which erroneous codewords of N parallel channels are jointly encoded for retransmissions. Erroneous and retransmitted codewords form a linear concatenated block code which is jointly decoded with a low complexity iterative decoding algorithm. Simulation results show that the normalized throughput performance obtains a significant gain while complexity increasing is limited.

The introduction of turbo-codes in digital communication systems represents a step towards more reliable data transmissions. The reliability can be enhanced by combining the codes with automatic repeat request (ARQ), known as hybrid-ARQ (HARQ). This paper provides analysis and computer simulations in MATLAB for evaluating the performance of HARQ schemes using turbo-codes as the FEC. The performance of the scheme is analyzed in term of bit error rate (BER) and bit energy to noise ratio spectral density (E b /N 0). Various parameters that influence the performance were investigated. Puncturing effects, number of iterations, decoding algorithm, size of packets and constrain length have been analyzed and evaluated to determine the effects and performances.