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This paper proposes a new graph-based practical encoding and joint belief propagation (BP) decoding techniques for two-vehicle communicating simultaneously with another vehicle or a roadside unit. The proposed scheme achieves any rate pair close to the capacity region without using time sharing. While at the encoders, the corresponding parity check matrices are randomly built from a half-rate matrix,...
In this paper, Serial Concatenated Convolutional Code (SCCC) with Continuous Phase Modulation (focus on MSK) and Log-MAP decoding algorithm is investigated. As an alternative solution to Parallel Concatenated Convolutional Code (PCCC), which is termed Turbo Code (TC), SCCC is in some cases superior to that of TC with similar complexity, especially at high Signal-to-Noise ratio. SCCC consists of a...
This paper investigates multi-dimensional Block Turbo Codes (BTCs) with trellis-based decoding, which have the possibility of providing a large range of block sizes. Large block size codes can provide significant coding gain and code rates. BTCs thus provide us more attractive options for a wide range of applications and higher bandwidth efficiency. Due to their excellent power and bandwidth efficiency,...
While the DVB-RCS standard turbo code, which uses quaternary alphabet and QPSK modulation, has an excellent performance, its bandwidth efficiency is limited by the puncturing and QPSK modulation to less than 2bits/s/Hz. In order to achieve bandwidth efficiencies of 2bits/s/Hz and higher, one needs coding and modulation schemes with M-ary alphabet (M>4). We have investigated an extended non-binary...
An important characteristic of turbo codes is the iterative nature of their decoder. One of the factors in determining the performance of turbo decoder is the number of iterations that is used for decoding each input sequence (frame). Using more iterations means decoding more sequences correctly. For example a decoder with 6 iterations per frame is not capable of decoding sequences that may be corrected...
In this paper, orthogonal space time block coding (OSTBC) in multiple input multiple output (MIMO) systems is employed. The considered channel is the triply selective fading channel (the spatially correlated obeying Kronecker model, time varying and frequency selective). The precoded OSTBC probability of error over triply selective Rayleigh fading channels is investigated for phase shift keying/quadrature-amplitude...
In this paper, we introduce a novel receiver for the detection of data in the presence of rapidly changing nuisance parameters and additive noise. This receiver uses a parallel structure, and its output approximates a Maximum Likelihood detection of the data. We apply this receiver to the special case of data detection of MPSK in the presence of rapidly changing unknown phase; here, the rate of phase...
This paper presents a new coding scheme that considerably increases the efficiency of the channel in multicast setting. Specifically, we study the scenario where three terminals exchange their messages via a satellite gateway. The main difference between the proposed scheme and conventional three-way relay channel is the use of joint channel and network coding. This allows three terminals to transmit...
Device-to-device communication is currently an active research topic in the cellular industry. D2D communication enables two mobile users in vicinity to directly communicate over a dynamically assigned, licensed spectrum without going through the base station. D2D offers tremendous benefits such as increase in spectral and energy efficiency, offload traffic of the base station and reduce transmission...
Diversity is a technique used to combat fading in wireless communication channels. One can attain spatial diversity using Multiple Input Multiple Output (MIMO) techniques to achieve high bit rates required for evolving multimedia applications. On the other hand, cooperative communication can be used to achieve the diversity gains typical of MIMO without the necessity for multiple antennas on the wireless...
In this paper, we present a comparative study of joint channel estimation and decoding of factor graph-based codes over flat fading channels. A new simple channel approximation scheme is proposed. Specifically, when channel state information is not available at the receiver, a simpler approach is to estimate the channel state of a group of received symbols, then use the approximated value of the channel...
In this paper we investigate a technique for increasing the capacity of a Digital Video Broadcasting—Return Channel via Satellite (DVB-RCS) system. In our previous work, we proposed a scheme consisting in adding a non-orthogonal interfering source to a DVB-RCS channel carrying data from an existing source. The inclusion of the new source does not cause bandwidth increase. The secondary source uses...
We consider an OFDM-based cognitive radio network where a secondary user chooses parallel sub-channels from different primary users' bands to form its transmission link. It transmits one OFDM sub-carrier per each sub-channel. Before starting its transmission, a primary user sends a beacon to inform the secondary user. If the secondary user receives this message, it does not use any sub-channel from...
We consider an OFDM-based cognitive radio network where a secondary user chooses parallel sub-channels from different primary users' bands to form its transmission link. It transmits one OFDM subcarrier per each sub-channel. Before starting its transmission, a primary user sends a beacon to inform the secondary user. If the secondary user receives this message, it does not use any sub-channel from...
Implementing rateless codes in cooperative scheme has attracted a lot of interest recently. It is an efficient and flexible solution for many practical communication areas, such as Digital Video Broadcasting (DVB). In this paper, we propose a relay scheme using systematic Raptor code which is standardized in 3GPP. The advantage of systematic over non-systematic Raptor code is that when there is no...
The Decode-and-Forward (DAF) relay strategy is the most popular cooperative diversity scheme due to its performance. Selection DAF (SDAF), relaying single or multiple relay selection, has recently been proven to achieve the same diversity order with lower power consumption than all-participate (AP) networks. Most SDAF methods assume constant power for the best relay, regardless of channel conditions...
Multiple Input Multiple Output (MIMO) techniques are used to exploit spatial diversity and to achieve high bit rates required for emerging multimedia applications. Cooperative communication can be used to achieve the diversity gains typical of MIMO without the need for multiple antennas on the consumer units. In this paper, we investigate the use of receiving node (destination) cooperation. We evaluate...
In this paper, we propose a scheme for increasing the capacity of forward and/or return links of the Digital Video Broadcasting Return Channel via Satellite (DVB-RCS). The increase of the capacity is achieved by overloading a pre-existing channel with a controlled interfering channel using Raptor code such that the transmission and decoding of the interfering data stream does not have any effect on...
In this paper, we propose a scheme for increasing the capacity of a communication channel by overloading a pre-existing channel with a controlled interfering channel using Raptor code. Combination of Raptor code and use of interference cancellation in the resulting Multiple Access Channel (MAC) results in almost perfect removal of the effect of the interfering channel. Thus, the primary channel's...
In this paper two novel methods for using network coding in the cooperative networks have been proposed. In the first scheme, network coding generates some redundancy in addition to the redundancy that is generated by the channel code. These redundancies are used in an iterative decoding system at the destination. In the second scheme, the output of the channel encoder in each source node is shortened...
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