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Rateless coding in wireless communication requires the receiver to continuously collect data until the decoding is finished successfully. Existing physical-layer rateless coding methods have many drawbacks like high error floor especially at low SNRs due to the dependency of check node degree distributions on the channel conditions to achieve the near capacity performance. Here a Ball-into-Bin rateless...
Some proposed high speed wireline communications make use of an ADC front end to allow a feedforward equalizer (FFE) to compensate for the frequency dependent loss of the channel. High precision ADCs are expensive in terms of power. The FFE block performs multiplication and addition operations at high speed and further increases the power consumption. This paper proposes a simple forward error correction...
Transmission reliability of data is an essential requirement of communication systems and multi-source Cooperation ensures it by allowing users to share their resources in order to collaborate through distributed transmission and processing of data. Another implication added on any communication system is that of a higher throughput, which is catered effectively by superposition coding. In this paper,...
In this paper, we estimate the Mutual Information Rate (MIR) for Two-Dimensional Magnetic Recording (TDMR) channel with input constraints by using the Generalized Belief Propagation (GBP) algorithm. The Voronoi channel model is considered in this paper. Since the main source of media noise in the TDMR channel is the boundary distortion of the bit area which is manifested in presence of transitions...
The design of the code is an important issue in an OCDMA systems, in which it can be constructed in one dimension or multi-dimensions. The two dimensional (2-D) code provides high spectral density and large number of subscribers. In this paper a literature review on noncoherent 2-D code families of OCDMA system is presented. The 2-D code is constructed by spreading the optical pulses in two dimensions...
In this paper, we investigate a new communication strategy for embedded image transmission over a realistic Multiple-Input Multiple-Output (MIMO) wireless channel. The objective of our approach is to guarantee Quality of Service (QoS) required by the user for all possible channel states. In this scope, two major improvements are considered. The first is based on Unequal Power Allocation (UPA) and...
The algorithm of choice an optimal combination of multiposition keying and antinoise code is proposed in this paper. The criterion for selecting the optimal combination is the maximal productivity in base station coverage area of mobile communication.
We focus on the road-to-vehicle visible light communication that system is composed of LED matrix as transmitter and high-speed camera as receiver. Conventionally, the transmitting rate has been reduced to half of the frame rate of the camera, to avoid intersymbol interference because of exposure time of camera frame. We propose a method to improve the communication rate. The transmitting rate is...
This paper presents a method of aerial acoustic communications in which data are modulated using repetition coded orthogonal frequency division multiplexing (RC-OFDM) and its superiority owing to frequency diversity gain.
An Hermite-symmetric subcarrier coding for OFDM systems (HC-OFDM) enables dual channel transmission over individual IQ wireless channels with higher power efficiency than a simple repetition coding (RC-OFDM). We theoretically proved the advantage of the HC-OFDM systems assuming an ideal coherent detection. But, in practice, the dual channel transmission needs precise phase compensation to separate...
In this paper, we present two variations on a linear physical-layer security code for the binary erasure wiretap channel, and examine their performance using small blocklength LDPC codes at rates above the secrecy capacity. We consider the maximum-likelihood attack, along with a message-passing attack, and show how the proposed codes enhance security in each case. Unique security metrics are employed...
Bit-Interleaved Coded Modulation with iterative decoding (BICM-ID) is a technique with combination of coding and high-order modulation. Its many outstanding merits such as it can advance the coding gain, suit the fading channel and separately design the encoding part and the modulation part, make it a very competitive technology in the new generation wireless transmission system. This paper analyzed...
In this paper, we investigate the design procedures of the bit labelling rule as well as the outer channel code for the table-based bit-interleaved coded differential amplitude/phase modulation (BICD-APM) scheme under correlated Rayleigh fading channels. Based on the asymptotic pairwise error probability (PEP) formula reported in the previous work, the design criteria for the generator polynomials...
We propose a differential space-time coded (STC) radio-frequency-identification (RFID) system where the tag has two antennas and the reader has a single or multiple antennas. In this system, the M-ary phase-shift keying constellation is used, and encoding at the tag and decoding at the reader are simple. Simulation results show that the proposed STC RFID system can achieve a performance improvement...
Polar codes were introduced recently as error correction codes to achieve asymmetric capacity in a binary-input discrete memory-less channel (B-DMC) using the channel polarization characteristics. In this paper, we propose the use of a soft input successive cancellation (SC) decoding algorithm for polar codes, and analyze the bit error rate (BER) performance of polar codes in an additive white Gaussian...
Low-Density Parity-Check (LDPC) codes with linear time encoding complexity and low hardware storage are a hot issue recently. We propose a general method for constructing LDPC codes with quasi-cyclic (QC) structure and improved zigzag pattern to obtain both linear time encoding and low hardware storage. We call it irregular repeat accumulate like (IRA-like) codes for its similarity with irregular...
In this study, the performance of tracking and data relay satellite (TDRS) communication system multiple access (MA) service is analyzed. Firstly, in order to eliminate multiple access interference, a multiuser detector based on minimum mean square error (MMSE) and artificial fish swarm algorithm (AFSA) is explored. The result of MMSE and its modified formations are used as the initial values of artificial...
Tactical communications is a communication system which is applied to a military operation with some strict requirements compared to a commercial communication system. One of the important requirement is its security. This communication has a high risk to be attacked by jamming which generated by the adversary. The other important requirement is network flexibility to handle its high mobility and...
Information sharing over the public domain is one of critical challenge. In this paper, a two stage model is discussed to perform adaptive information encoding and dynamic steganography approach. At first level of proposed model, the adaptive encoding approach is dictionary based approach that performs the cyclic shift to encode the textual or image information. At second level of proposed model,...
Spatial modulation (SM) is performed in both spatial and signal domains. The spatial-domain modulation involves the coding process of transmit antennas (TAs). The traditional coding method uses natural binary code, which leads to relatively poor bit error rate (BER) performance in spatial correlated channels. In this paper, we propose a simple yet efficient TA coding scheme by utilizing Gray code...
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