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In this paper, the iterative learning control problem using uniform quantizer with encoding and decoding scheme is considered, in which the system output is transformed and encoded firstly, and then transmitted back to the controller and decoded for input updating. Zero-error convergence of the output to the desired reference is realized by utilizing this updating scheme. The results are extended...
Time-domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) is widely recognized as an orthogonal frequency division multiplexing (OFDM) transmission scheme with high spectral effciency. However, it suffers from severe performance loss over strong frequency selective channels, thus has difficulty supporting high-order modulations such as 256 QAM. To improve the channel estimation...
A 16-Mb mask read-only memory (ROM) chip based on a novel diode structure is proposed. The diodes are constructed by buried n-type implantation layer and heavily doped p-type diffusion layer. With dual-trench isolation process and borderless contact scheme, the diode array can realize ultrahigh density. The fabricated mask ROM chip using 40-nm CMOS bulk technology is wired with three levels of metal,...
In this paper, a dual-decoder-based scheduling algorithm is proposed for H.264 video transmission over wireless networks. In the algorithm, the packet is scheduled by the packet quality contribution index (PQCI). The PQCI is defined and estimated not only by the quality distortion made for the current frame, but also by that made for the frames which directly or indirectly related with the current...
Automatic repeat-request(ARQ) protocols for two-way relay systems, where two terminals communicating via a relay node, are investigated in this paper. According to different feedback schedules, we propose three basic ARQ protocols to improve the link reliability for two-way relay systems, namely Relay-only ARQ (Ro-ARQ), Terminal-only ARQ (To-ARQ) and Relay-Terminal ARQ (RT-ARQ). In addition, simulation...
An updatable automatic repeat request (ARQ) protocol for distributed space-time coded cooperative networks is proposed in this paper. We define a decoding relay set (DS), composed of the relays decoding the packet from source correctly. The DS would be expanded as the round of ARQ increasing, because the relays failing to receive correct packet in previous (re)transmission are still possible to decode...
In this paper, a novel channel estimation scheme called Two-Pilot Estimation (TPE) is proposed for distributed space-time decoding in Amplify-and-Forward (AF) based wireless relay networks. For Maximum Likelihood (ML) decoding at the destination, directly estimating the product of source-relay (S-R) channel and relay-destination (R-D) channel either is difficult, or causes drastic receiver degradation...
Rate and diversity impose a fundamental tradeoff in wireless communication. We propose a novel distributed space-time coding (DSTC) scheme based on linear constellation precoding (LCP) for Amplify-and-Forward relaying networks. The proposed scheme can achieve full-diversity or full-rate, and also offers a flexibility for a desired rate-diversity tradeoff. This scheme works well with arbitrary signal...
In this paper, we study optimum SNR threshold based partial decode-and-forward (PDF) schemes where relays may choose to forward the demodulated symbols in form of distributed space-time coding (DSTC) or to remain silent according to instantaneous link qualities of the source to relays. Considering the possible error of Maximum likelihood decoding at intermediate relays, we model a general noise in...
Low Rate Orthogonal Convolutional Codes (LROCC) have been confirmed an outstanding performance in AWGN channel with multiple users, such as the en-route situation in the aeronautical communications with several aircrafts. However, the orthogonal sequences in LROCC still suffer from multipath interference in fading channel, which degrades the performance in practical scenarios. In this paper, extended...
Fountain codes is a class of forward correcting codes (FEC) very suitable for applications like content dissemination and reliable multicasting in erasure channels. However, the code-length of the traditional fountain codes is quite large that holds back the data fountain scheme from efficiently supporting real-time services and resource restricted applications. This paper focuses on the designing...
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