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In this paper, we consider a Generalized Joint Channel Network Coding (GJCNC) applied to Physical Layer Network Coding (PLNC) for Two Way Relay Channel (TWRC). For this purpose, two correlated sources A and B desire to exchange information with each other by the help of a relay R. PLNC allows the relay to decode the combined information of both sources from the superimposed information. A Low Density...
In this paper, a new trend of Space Time Block codes-Orthogonal Frequency Division Multiplexing (STBC-OFDM) with Convolutional and Turbo codes. The applied method is based on Alamouti's scheme. We examine the performance of two, three and four transmitters with one receiver over Nakagami-m fading channel using convolutional and turbo codes using BPSK. Also we examine their performance using turbo...
The performance of a wireless system depends on the wireless channel as well as the algorithms used in the transceiver pipelines. Because physical phenomena affect transceiver pipelines in difficult to predict ways, detailed simulation of the entire transceiver system is needed to evaluate even a single processing block. Further, some protocol validations require simulation of rare events (say, 1...
In this paper, the impact of colored noise on the ultimate performance limits of broadband single carrier power line communication (PLC) systems is analyzed in terms of information rate (IR). As a case study, the IR analysis is applied to a high voltage (HV) PLC channel affected by corona noise as a particular type of colored noise: in order to complete the theoretical results, the bit error rate...
This study analyzed and simulated special Golay (20, 8) channel code. When the bit error probability Pb = 10-5, Hamming (16, 11) has about 0.5dB coding gain compared with Golay Code (20,8) t = 3, and Golay Code (20,8) t = 4 has about 0.2dB coding gain compared with Hamming (16, 11). Thus, Golay Code (20, 8) t = 4 has about 0.7dB coding gain compared with Golay Code (20,8) t = 3. This study also analyzed...
The data delivery performance of multiple description coding (MDC) over unreliable network with capacity constraints is related with three factors: redundancy rate, packet loss rate (PLR), and bit error rate (BER). We simplified this network-adaptive delivery problem to only relate with redundancy rate. The proposed scheme is an extension of scalar quantization (SQ) based MDC.
The NASA Radiation Belt Storm Probes (RBSP) mission, launching in 2012, features two spacecraft that will measure the dynamics of the radiation belts as they proceed in nearly identical orbits around the Earth. The Radio Frequency (RF) telecommunications subsystem will utilize an S-Band version of the Johns Hopkins University Applied Physics Laboratory's (JHU/APL) Frontier Radio. The Frontier Radio...
Turbo codes play an important role in making communications systems more efficient and reliable. This paper provides a description of two turbo codes algorithms. Soft-output Viterbi algorithm and logarithmic-maximum a posteriori turbo decoding algorithms are the two candidates for decoding turbo codes. Soft-input soft-output (SISO) turbo decoder based on soft-output Viterbi algorithm (SOVA) and the...
Different system may have different request on coding efficiency and security, even the characteristics of the unreliable networks are fixed, such as bit error rate, packet loss rate and bandwidth. In this paper, a novel multiple description coding (MDC) scheme is presented for the unreliable networks, considering both the network characteristics and system request. An error-resilient problem based...
Spectrally Efficient Frequency Division Multiplexing (SEFDM) systems aim to reduce the utilized spectrum by multiplexing non-orthogonal overlapped carriers. Since the per carrier transmission rate is maintained, SEFDM yields higher spectral efficiency relative to an equivalent Orthogonal Frequency Division Multiplexing (OFDM) system. Yet, due to the loss of the orthogonality, detection of the SEFDM...
A modified sphere decoding (SD) scheme is proposed for multiple-input multiple-output (MIMO) communication systems in this paper. The conventional SD goes from the lower dimension to the higher dimension to examine whether a lattice point lies inside the sphere of some radius, which remains fixed for all dimensions. Since the sphere radius directly affects the search range and thus the complexity,...
This paper presents the outage probability analysis of Joint Channel and Network Coding (JCNC) scheme in Multiple Access Relay Channel (MARC). In particular, the effect of using different interleaver patterns at different users is analysed. The motivation of this work is to show that despite its capability of achieving up to 2 dB gain in Packet Error Rate (PER), the corresponding outage probability...
Modern codes are often designed to attain the minimum possible error probability under a blocklength constraint. For instance, sparse-graph codes are often designed aiming for large girth in order to reduce the error-probability. In this paper, we show that such an improved performance comes at a fundamental cost: longer interconnects (wires) in the decoding circuit. Recent empirical results show...
The CEO problem of estimating a single binary data source using multiple observations is considered. A closed form equation for maximum achievable information capacity of the system is derived for different system parameters including number of sensors, observation accuracy and channel quality. A new criterion for sensor clustering is provided based on the minimum number of sensors required to achieve...
In this paper, we proposed an effective and unified transmit power allocation (TPA) scheme for the Singular Value Decomposition (SVD)-Assisted multi-user multiple-input multiple-output (MU-MIMO) downlink (DL) and uplink (UL) transmissions in the presence of imperfect channel state information (ICSI). The existing power allocation policies for the SVD-Assisted MU-MIMO system, such as equal power allocation...
The performance of non-binary joint network-channel decoding (NB-JNCD) is examined in wireless sensor networks with correlated sensors. The operating assumption is that systems containing multiple sensors in close proximity obtain correlated measurements. It is shown that, when the correlation model between sensors is known at the sink, the addition of a correlation-based decoder within the decoding...
This paper studies the mutual information improvement attained by rotated multidimensional (multi-D) constellations via a unitary precoder G ∈ CN×Nin Rayleigh fading. At first, based on the symmetric cut-off rate of the N-D signal space, we develop a design criterion with regard to the precoder G. It is then demonstrated that the use of rotated constellations in only a reasonably low dimensional signal...
In this paper, an adaptive forwarding strategy for wireless networks using relays in multi hop and cooperative network is discussed. Here two schemes, amplify-and-forward (AF) and decode-and-forward (DF) are chosen depending on channel condition. Further it allows switching between the two schemes according to channel condition. The bit error probability performance (BEP) for the proposed hybrid strategy...
In this paper, the performance evaluation of an asymmetric turbo code for different codec parameters have been done. The asymmetric turbo codes performances are compared with symmetric counter part of the turbo code. With proper selection of weight configuration, the turbo code can show better results in both water fall region as well as error floor region simultaneously. So, in some cases asymmetric...
Forty years ago, Viterbi published upper bounds on both the first error event (burst error) and bit error probabilities for Viterbi decoding of convolutional codes. These bounds were derived using a signal flow chart technique for convolutional encoders. In 1995, Best et al. published a formula for the exact bit error probability for Viterbi decoding of the rate R = 1/2, memory m = 1 convolutional...
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