In order to improve the error performance of M-ary differential chaotic shift keying (DCSK) systems over multi-path fading channel, two types of iterative structures have been employed in receiver design. One is joint...
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ISBN:
(纸本)9781509016990
In order to improve the error performance of M-ary differential chaotic shift keying (DCSK) systems over multi-path fading channel, two types of iterative structures have been employed in receiver design. One is joint source-channel decoder (JSCD), the other is iterative receiver (IR). Although several works have separately addressed the advantages of IR and JSCD, it is not clear which design provides more iterative gain for M-ary DCSK systems over multi-path fading channels. In this work, we employ the extrinsic information transfer (EXIT) chart technique to analyze the iteration behavior of JSCD and IR. Simulation results suggest that with enough source redundancy, JSCD outperforms IR under M-ary DCSK systems over multi-paths fading channels.
This paper proposes a hybrid sender/receiver-driven error protection scheme to transmit scalable video packets over packet-lossy peer-to-peer networks. In our scheme, given an estimated system uplink capacity, a joint...
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ISBN:
(纸本)9781479923427
This paper proposes a hybrid sender/receiver-driven error protection scheme to transmit scalable video packets over packet-lossy peer-to-peer networks. In our scheme, given an estimated system uplink capacity, a joint source-channelcoding (JSCC) mechanism based on receiver-driven subscriptions is proposed to minimize the visual distortion received by child-peers by subscribing to appropriate amounts of source and channelcoding packets. Because the bandwidth for inter-peer transmissions may fluctuate largely due to peer dynamics, in our method peers estimate the available system uplink capacity based on consensus propagation to avoid the fluctuating allocations of JSCC. To efficiently utilize the uplink bandwidth of peers, parent-peers use sender-driven contribution-guided peer selection to reject the low-contribution subscriptions requested from candidate child-peers. Simulation results demonstrate that our method significantly improves visual quality, compared to other state-of-the-art schemes.
We consider the problem of joint source and channelcoding of structured data such as natural language over a noisy channel. The typical approach to this problem in both theory and practice involves performing source ...
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ISBN:
(纸本)9781538646595
We consider the problem of joint source and channelcoding of structured data such as natural language over a noisy channel. The typical approach to this problem in both theory and practice involves performing sourcecoding to first compress the text and then channelcoding to add robustness for the transmission across the channel. This approach is optimal in terms of minimizing end-to-end distortion with arbitrarily large block lengths of both the source and channel codes when transmission is over discrete memoryless channels. However, the optimality of this approach is no longer ensured for documents of finite length and limitations on the length of the encoding. We will show in this scenario that we can achieve lower word error rates by developing a deep learning based encoder and decoder. While the approach of separate source and channelcoding would minimize bit error rates, our approach preserves semantic information of sentences by first embedding sentences in a semantic space where sentences closer in meaning are located closer together, and then performing joint source and channelcoding on these embeddings.
In this paper we propose an efficient VLSI implementation of a Soft Input Soft Output (SISO) arithmetic code (AC) decoder for joint sourcechannelcoding. The addressed application shows a very high level of processin...
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ISBN:
(纸本)9783981080131
In this paper we propose an efficient VLSI implementation of a Soft Input Soft Output (SISO) arithmetic code (AC) decoder for joint sourcechannelcoding. The addressed application shows a very high level of processing complexity, but, to the best of our knowledge, no papers have been published in the literature on the hardware implementation of the considered joint sourcechannel scheme. First we introduce a simplified algorithm for the SISO AC, which is 1.3 times faster than the standard one. Then an efficient SISO AC architecture is proposed and synthesis results on a 0.13μm standard cells technology are reported for two different sets of parameters (M=128, M=256). The proposed core runs at 338.9MHz and can decode up to 124.987kbit/s.
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