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In this paper, a channel estimation method based on the superimposed pilots with the first-order statistics is proposed for massive MIMO systems. In the proposed method, no time slots are cost on training. Hence, transmission rate of the system is higher than the traditional method. Further, a decoder is designed based on MMSE decoder. Finally, simulations show that the performance of the system with...
In this paper, we propose a new space-time block coding scheme to mitigate the effect of pilot contamination in multi-cell, massive Multiple-Input Multiple-Output (MIMO) systems. We derive the code design criterion and give some code design examples. Moreover, we present a new decoding method based on an oblique projection, which has a low decoding complexity. Simulation results show that our coding...
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,...
We consider an asynchronous two-way relay network, in which two double-antenna relays assist in the communication between two single-antenna terminals through analog network coding. The asynchronous transmission between relays and terminals causes symbol misalignments and results in diversity loss in space-time block code (STBC). We propose a zero-padded time-reversal quasi-orthogonal STBC that can...
Based on LDPC-OFDM system, a multi-base station cooperative algorithm is designed for high frequency (HF) channel, and a LDPC cooperative decoding algorithm is proposed, which adopts information combining strategy based on the probability measure. The center station in the system model uses the multiple signals received from the relay stations to update its received initialization information. This...
In this paper, two designs of blind interference alignment (BIA) with space-time codes are proposed for a two-user interference channel, where each transmitter has four antennas and each receiver has one pattern reconfigurable antenna that can switch among several preset modes. The proposed BIA schemes can align and cancel the interference by controlling the switching pattern of the reconfigurable...
The deblocking filtering for multiview video coding plays a major role in improving the image visual quality, but it has high computation complexity. This paper proposes a perceptual deblocking filtering algorithm based on just noticeable distortion model. By properly considering of the human visual characteristic, a perceptual deblocking filtering decision is integrated into the deblocking process...
Resistive random access memory (RRAM) is a promising candidate to substitute static random access memory (SRAM) in lookup table (LUT) design for its high density and non-volatility. RRAM cells are fabricated at backend CMOS process and have negligible area cost. However, the complex peripheral circuit design to satisfy performance and accuracy requirements becomes a major issue. In this work, we propose...
Reed-Solomon (RS) codes are widely used in modern communication and computer systems. Compared with the hard-decision decoding algorithms, the algebraic soft-decision decoding (ASD) algorithm can achieve significant coding gain. Among ASD algorithms, the low-complexity Chase (LCC) decoding has a better performance and lower complexity. In the LCC decoding, 2η test vectors need to be interpolated and...
Nodes of wireless sensor networks (WSN) may fail easily due to the lack of energy or disaster scenarios. Such failures can severely reduce the persistence and collection efficiency of sensed data. Network coding technology can be employed to enhance the data persistence of wireless sensor network, but it may cause serious "cliff effect" in decoding process. In this paper, the influence of...
Look Up Table (LUT) is a basic configurable logic element in Field Programmable Gate Arrays (FPGAs). In a commercial product, Static Random Access Memory (SRAM) has been widely used in each LUT to store configured logic. Recently, emerging Resistive RAM (RRAM) has attracted a lot of attention for its high density and non-volatility. In this work, we explore a novel LUT design with bipolar RRAM devices...
In distributed single-view video coding (DSVC) or distributed multiview video coding (DMVC), the compression performance is greatly affected by the quality of side information (SI). Most existing DSVC or DMVC schemes generate SI by employing motion estimation (ME) at the decoder. Since the original frame is unavailable, the ME accuracy is low. In this paper we propose a novel distributed coding scheme...
A fast-decodable distributed space-time block code (STBC) is proposed for a two-path successive relay network that can achieve both full diversity and full transmission rate. The proposed STBC employs a precoder to rotate the constellation of transmitted symbols at source. After decode-and-forward by relays, the rotated information symbols are decoded at destination. It is shown that single complex...
The paper presents a digital (clock and data ecovery) CDR that occupies 72 × 72 μm2 and dissipates 12 mW at 8 Gb/s from a 0.81 V power supply. The transceiver characteristics are summarized. The die micrograph of the dual port transceiver was also illustrated with the digital CDR, the VCO, and each lane highlighted.
A distributed space-time block code (STBC) based on a decode-and-forward (DF) protocol is proposed for two-path successive relaying. By making the two relay nodes transmit and listen in turn, the proposed distributed STBC can achieve not only full rate but also full diversity when the relay nodes can correctly decode the information symbols from the source node and when the inter-relay channels are...
In this paper, we propose a systematic design of space-time block codes (STBC) which can achieve high rate and full diversity when the partial interference cancellation (PIC) group decoding is used at receivers. The proposed codes can be applied to any number of transmit antennas and admit a low decoding complexity while achieving full diversity. For M transmit antennas, in each codeword real and...
Wireless MIMO relay networks have caught a lot of attention because of the potential to enhance performance by exploiting the joint cooperative and spatial diversity. In this paper, we develop high-rate and low-complexity designs for multi-antenna MIMO relay networks by adopting zero-forcing linear equalizers at both relay and destination and designing a simple power scaling at relay. Furthermore,...
In this work, we find the optimal relay location for a secondary user in a cognitive radio network subject to outage constraints. With selection decode-and-forward relay protocol, we formulate this problem as a nonlinear optimization problem, and then derive an approximation formulation that gives a close-optimal relay location, which means that we can use the approximation instead to solve the relay...
The existing distortion correction methods are not fully suitable the multi-distortion image of Data Matrix symbol directly marked on cylinder surface, so an ellipse-arc grid method is proposed to correct this kind of distortion image. Firstly, two ellipse-arc boundaries and two line boundaries are detected based on the symbol contour point set, Secondly, two groups of ellipse-arc and line are interpolated...
In this paper we propose a distributed video combining method applicable to continuous presence multipoint video conferencing for the H.264 coding standard. The proposed method takes advantage of the significant coding features of the H.264 format and employs star-connected multiple video combiners to perform combining process cooperatively. We investigate the architecture and the required operations...
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