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We present a digital baseband ASIC for 60 GHz single-carrier (SC) transmission that is optimized for communication scenarios in which most of the energy is concentrated in the first few channel taps. Such scenarios occur for example in office environments with strong reflections. Our circuit targets close-to-optimum maximum-likelihood performance under such conditions. To this end, we show for the...
In this paper, a novel iterative equalizer is introduced, the two symbols ISDIC (2S ISDIC) equalizer. The 2S ISDIC is the first equalizer that bridges the gap between the low complexity ISDIC equalizer which has poor performance, to the high complexity inverse channel equalizing methods, such as the LMMSE and the MMSE ISDIC equalizers, which have better performances. The 2S ISDIC will be incorporated...
In this paper a strategy for increasing data persistency in wireless sensor networks has been proposed. Due to usually hazardous environment and limited resources, sensors in the network are vulnerable. Therefore the best approach to increase data persistency is distributed storage. We propose an Efficient Distributed Storage based on LT codes (EDSLT) strategy which implements directional random walk...
In this paper, we consider the problem of carrier phase estimation for an M-ary phase shift keying modulated frequency-hopping system affected by strong phase noise. An improved joint detection and decoding algorithm is presented based on the factor graph and sum-product algorithm framework. The messages on the factor graph are approximated into the sums of multiple Tikhonov distributions. Numerical...
The performance of coded MIMO systems can be enhanced by effectively utilizing soft iterative estimation techniques at the receiver. The main concern on this iterative techniques is computational complexity and feasibility of the hardware implementation. This paper evaluates a number of soft iterative MIMO detection schemes in terms of the bit error rate performance as well as computational complexity...
In this paper, we propose a joint channel impulse response (CIR), phase noise (PHN) estimation and decoding algorithm for time-selective flat Rayleigh fading channels. Building on the first-order autoregressive model approximation for both the time evolutions of CIR and PHN, a factor graph of the joint a posteriori probability function is constructed and the sum-product algorithm is applied to derive...
In current 3D video coding solutions, such as the 3D-HEVC standard, depth data is instrumental to have a continuum of views synthesized at the decoder based on a limited set of coded views. In order view synthesis may be performed at the decoder, depth data is currently directly acquired or estimated at the encoder based on very few neighboring views and transmitted to the decoder after appropriate...
Hierarchical autonomous system (AS) solves the problem of controlling the entire Space Information Network (SIN) for whose high component complexity and dynamic. Aiming at the problem that storage resource of AS network's node severely limited, we propose an efficient Distributed Date Storage based on Fountain codes (DDSF) strategy. DDSF implements directional random walk mechanism for packet transmission,...
In this paper, we investigate the detection of single-carrier transmission over frequency selective fading channels with symmetric alpha-stable (SαS) noise. To mitigate the effects of the inter-symbol interference (ISI) cased by multi-path propagation and the destructive impulsive noise, a non-linear myriad filter is firstly adopted and an asymptotic statistic method is then introduced for to analyze...
In steganographic technique of "sum and difference covering set" (SDCS), an appropriate SDCS is used to embed data into pixel sequences of cover image. This technique extends the conventional LSB matching and matrix embedding to derive more secure steganography. In this paper, towards stego-security enhancement, a new SDCS-based contentadaptive steganography is proposed. The most noisy pixels...
We consider a distributed parameter estimation problem, in which multiple terminals send messages related to their local observations using limited rates to a fusion center who will obtain an estimate of a parameter related to observations of all terminals. It is well known that if the transmission rates are in the Slepian-Wolf region, the fusion center can fully recover all observations and hence...
This paper analyzes the bit error rate (BER) performance of grouped frequency division multiple access (GFDMA) using a tool known as finite length analytical tool (FLAT). We derive the equations of the FLAT method including the variance of the equalizer output signal for different iterations. We use this value to calculate the BER of the equalizer output when a specific set of sub-carriers are assigned...
In this paper, a complexity-reduced error propagation mitigation algorithm is presented by exploiting source-relay (S-R) correlation information with the limited channel feed-forward bits from the relay node to the destination node. The proposed idea employs the limited channel feed-forward bits as the S-R correlation information indicator and uses it for the iterative decoding at the destination...
In frequency-hopping systems, the multiple-access interference (MAI) occurs when more than one user appear on the same frequency at the same time. In this paper, we address the multi-user detection (MUD) problem for slow frequencyhopping (SFH) system with binary phase shift keying (BPSK). We first built a MAI model taking the hopping patterns and the phase offset into account, whereby the MAI is considered...
In the HEVC standardization process, the In-loop filter module is added with a new video coding tool called sample adaptive offset (SAO). SAO is placed after de-blocking in video coding loop. The HM implementation (HM10.0, 2013) & the standard (Bross et al., 2013) indicates picture basis in-loop filtering i.e., both de-blocking and SAO. Although standard specifies picture basis de-blocking operation,...
This paper proposes an iterative cancellation scheme for adjacent channel interference (ACI) caused by nonlinear transmit power amplifier (PA) in millimeter wave (mmW) systems with the assistance of a nonlinear estimator and channel decoder's feedback. In this method, nonlinear distortion included in the transmit signal is estimated by polynomial regression analysis using not only the pilot signal...
In Compressed Sensing, a real-valued sparse vector has to be reconstructed from an underdetermined system of linear equations. However, in many applications of digital communications the elements of the unknown sparse vector are drawn from a finite set. The standard reconstruction algorithms of Compressed Sensing do not take this knowledge into account, hence, enhanced algorithms are required to achieve...
We consider a sensor scheduling and remote estimation problem with one sensor and one estimator. At each time step, the sensor makes an observation on the state of a source, and then decides whether to transmit its observation to the estimator or not. The sensor is charged a cost for each transmission. The remote estimator generates a real-time estimate on the state of the source based on the messages...
Emerging wireless sensor networks (WSNs) aim to overcome current needs for additional backbone infrastructure in mobile networks. Confronted with enormous requirements in terms of spectrum and energy efficiency, WSNs have been shown to benefit from distributed source coding (DSC) by means of multi-route redundancy. However, DSC in WSNs yields low performance regarding the correlation estimation of...
The Hybrid encoder is trying to choose the better encoder between the Wavelet Difference Reduction (Type-W) and Simple Bit-plane (Type-B) to get the better results than pure Type-W or pure Type-B was proposed in previous research. In case that the most pixels are insignificant, Type-B will generate a long consecutive sequence of zero bits. By experimental results, the Modified Simple Bit-plane which...
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