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With the growing popularity of mobile applications such as voice over IP (VoIP) and real-time conversational video, and due to the scarcity of the available radio spectrum, increasing the spectral efficiency of wireless systems under quality of service (QoS) constraints becomes increasingly important. Accordingly, in this paper we investigate the maximum achievable rate of incremental redundancy type...
A fiber-optic communication system employing a multistage bit-wise coded modulation scheme is considered as it enables the efficient utilization of higher-order modulation formats in combination with binary forward error correction (FEC) coding. Since modern FEC schemes employ soft-decision decoding, soft information on coded bits is required. In this paper, the decoding metric for the multistage...
Continuous phase modulation (CPM) is a family of bandwidth-efficient signaling schemes with memory. In this paper we introduce a simulation-based method to compute a lower bound, namely the dependence testing (DT) bound, on the maximum achievable rate of general CPM schemes under finite blocklength, probability of error, and equiprobable input distribution constraints. The proposed method utilizes...
In this paper we consider the cognitive radio system based on spectrum sensing, and propose an error correction technique for its performance improvement. We analyze secondary user link based on Orthogonal Frequency-Division Multiplexing (OFDM), realized by using Universal Software Radio Peripheral N210 platforms. Parameters of low density parity check codes and interleaver that provide significant...
Spread spectrum (SS) modulation is one of the most commonly used methods for data hiding. However, the capacity of SS-based methods is rather limited. To improve the hiding efficiency, this paper presents a method that employs the parallel combinatory spread spectrum (PCSS), in which the hidden data can be transmitted in parallel with a combination of a few pseudo noise sequences. An informed embedding...
Brain-computer interfaces (BCIs) are often based on the control of sensor motor processes, yet sensor motor processes are impaired in patients suffering from amyotrophic lateral sclerosis (ALS). We devised a new paradigm that targets higher level cognitive processes to transmit information from the user to the BCI. We instructed five ALS patients and eleven healthy subjects to either activate self-referential...
WLAN IEEE 802.11n is recent wireless data communication technology which provides high throughput and high performance. These features are definitely determined by the strength of MIMO decoder. The existing MIMO decoder of WLAN 802.11n is based on linear method, i.e Zero Forcing (ZF) and Minimum Mean Square Error (MMSE). Both of them are low in complexity but poor in performance. In the other hand...
This paper focuses on two-way relaying (TWR) system, where two source nodes exchange information with each other simultaneously via the relay node. We proposes a denoise-and-forward two-way relaying (DNF-TWR) scheme using non-coherent multiple differential phase-shift keying (M-DPSK) modulation when the channel state information (CSI) is unknown. Firstly, we design the denoising mapping function at...
Brain-Computer Interfaces (BCIs) often rely on low-level cognitive processes known to be impaired in late stages of amyotrophic lateral sclerosis (ALS). We propose a BCI for ALS patients based on self-regulation of neuronal oscillations in the superior parietal lobule, which is less affected by ALS than motor and sensory cortices. We describe a case of self-regulation of band power in gamma range...
Code phase shift keying (CPSK) is an efficient M-ary modulation that can be applied to spread spectrum (SS) based watermarking to improve the watermark payload. However, the host media acts as interference that degrades the watermark robustness, especially in high-payload applications. In this paper, an informed embedding method for CPSK-based watermarking is proposed. The host is utilized at the...
A joint modulation and coding scheme is proposed based on Rateless Codes and Vector OFDM systems to combat fading over doubly selective channels. A rateless encoder can generate potentially unlimited coded symbol. Vector OFDM is a general transmission scheme, where OFDM and Single-Carrier systems can be seen as two extreme cases. The main focus of this paper is to design and analyze a Rateless Coded...
A new performance abstraction method for the Maximum Likelihood Decoder (MLD) in the Multiple-Inputs Multiple-Outputs (MIMO) channel is presented. The method is based on a model of the iterative equalize and de-map decoder for MIMO channel and abstracts the performance of the MIMO link into a set of effective Signal-to-Noise power Ratio (SNR) values corresponding to the different streams. The proposed...
Driven by multimedia based applications, the future wireless systems require high data rate capable technologies. WiMAX has attracted immense interest globally for next generation wireless communication. The requirement of a spectrally efficient modulation technique and power efficient forward error correction scheme are key factors for these technologies. Wireless link quality is determined by transmission...
We report a PAM-ECDMA PON system with 2.5-fold performance improvement over the prior NRZ-ECDMA system. Error-free transmission of two channels in an 8-user 25.6 Gb/s aggregate-data-rate PON is achieved in a proof-of-principle demonstration.
Communication channel is highly prone to noise and therefore error correcting codes are required to protect the transmitted data. Residue Number System (RNS) is defined as the representation of an integer in the residue field. Redundant Residue Number System (RRNS) is obtained by adding some redundant residues in the RNS. In RNS, the arithmetic operations are carry free, so errors do not propagate...
In this paper, we consider the network coding (NC) enabled three-phase protocol for information exchange between two users in a wireless two-way (bidirectional) relay network. Modulo-based (nonbinary) and XOR-based (binary) NC schemes are considered as information mixture schemes at the relay while all transmissions adopt pulse amplitude modulation (PAM). We first obtain the optimal constellation...
We answer the question in the title negatively. More precisely, the FEC limit is invalid for soft decision decoding and low to medium code rates. A better predictor is the generalized mutual information.
In this paper, we highlight the class of spatially coupled codes and discuss their applicability to long-haul and submarine optical communication systems. We first demonstrate how to optimize irregular spatially coupled LDPC codes for their use in optical communications with limited decoding hardware complexity and then present simulation results with an FPGA-based decoder where we show that very...
For digital terrestrial television broadcasting (DT-TB) systems, orthogonal frequency division multiplexing (OFDM) technique is considered to be an effective method to combat the frequency selective channel cause by multi-path effect. In the single frequency network (SFN) scenario, Alamouti space frequency block coding (SFBC) is introduced to provide spatial diversity gain and improve the link stability...
The article is devoted to the instrumental means of the design of video data link, which are mounted on board the aircraft. The information concerning the possibilities of the program model use for the choice of the basic hosts and image translation options via physical "channel with gaps" is given in the article.
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