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A novel coded modulation scheme which adaptively supports multiple modulation formats for software defined networks is proposed. With the same fundamental FEC architecture, alterable bitrates can be compatibly implemented without additional hardware recourses and performance penalty.
Although the K-best algorithm is well-known as an efficient suboptimal version of the maximum likelihood detection (MLD), its complexity is still significantly affected by the constellation size W. Especially, its sorting task is known as the major bottleneck. In this paper we propose a two dimensional (2D) sorter-based K-best algorithm, whose complexity is negligibly affected by W. Instead of considering...
We optimize the allocation of coded bits to modulation bits for spatially coupled low-density parity-check (SC-LDPC) codes and PM-64-QAM. Tailbiting SC-LDPC codes are shown to offer a similar gap to capacity as their terminated counterparts, at a lower FEC overhead.
The DVB-S2 standard has been revealed a reliable standard for data transmission thanks to the LDPC codes. The waterfall of the bit-error rate is very abrupt to reach low values of order 10^(-10) in the error floor. In this paper, we propose a novel investigation on the iterative decoding of these codes by the Belief Propagation algorithm on Gaussian channels. Introducing definitions of persistent...
With the widespread popularity of mobile terminals, wireless video has become an indispensable part of daily life. Recently, an uncoded transmission scheme called SoftCast was presented to provide graceful quality transition. After linear transformation, the energy of the signal is concentrated to a few coefficients. However, the protection of these coefficients is not enough in SoftCast. This paper...
Greendicator is an indicator system that enables wireless embedded sensing systems to output data encoded as LED pulses to be decoded and viewed on smart phones. The transmitter encodes the message to be displayed in the form of modulated light pulses emitted with an existing visible-light LED or other light-emitting devices such as IR, laser diode, or light reflector. The receiver uses a camera-equipped...
Distributed Estimation scheme has been widely used in sensor networks. Through various approaches, sum of bits, Sigma-Delta modulation, and source coding, this paper implements the above techniques for distributed estimation and provides a new one called Quantization Region Allocation. In the end, this paper analyzes the performance (minimum mean squared error) and demonstrates performance approximating...
Coverage enhancement is important to support and broaden the application of the machine type communication( MTC) in long term evolution (LTE). Coverage enhancement for physical downlink control channel(PDCCH) is one key issue. A new compact PDCCH for MTC was widely proposed to provide coverage enhancement gain. However, due to the inclusion of cyclic redundancy check(CRC) sequence, the coverage enhancement...
In this paper, we focus on the behavior of the Belief Propagation (BP) algorithm when decoding the Low-Density Parity-Check (LDPC) code of rate 3/4 in the DVB-S2 standard. By studying the topological structure of its Tanner graph, we raise properties inherent to the degree distribution that turns out to be strongly correlated with the decoding failures. The irregularity of the degrees seriously damages...
Digital video broadcasting-next generation handheld (DVB-NGH) is the first broadcasting standard that incorporates multiple-input multiple-output (MIMO) techniques to overcome the Shannon limit of single antenna systems. This paper contributes to analyze the performance of the DVB-NGH MIMO coded modulation system. The detailed performance degradation from information-theoretic limit to implementation...
This paper proposes a rate adaptation strategy based on Spinal codes, a novel rateless codes, in truncated incremental redundancy hybrid ARQ (HARQ) transmission. The information transmission between Satellite or deep space probes and ground receivers is considered. Too many retransmissions, which are caused by error frame, and long distance lead to considerable delay, up to several seconds. The delay...
In this work, a transmission scheme that combines multi-layer multi-rate (MLMR) coding with quasi-orthogonal space-time block coding (QO-STBC) is proposed. Firstly, the proposed QO-STBC codewords set unequal diversity orders for different transmitted spatial data layers. Then, different spatial data layers are protected by different-rate channel codes with the aim of achieving the same post-decoding...
In this paper, we present an efficient fault tolerant solution for multi-level per cell (MLC) flash memory that concatenates trellis coded modulation (TCM) with an outer low-density parity-check (LDPC) code. Traditional flash coding systems employ simple hard-decisions based codes, such as Bose-Chaudhuri-Hocquenghem (BCH) codes, that can correct a fixed, specified number of errors. Thanks to the Bahl,...
This paper presents an adaptive overall QoS maximizing multicast video streaming system over wireless network. While a conventional logical superposition modulation scheme generates symbols using a pre-determined modulation combination to overcome wireless channel uncertainty of subscribers, the ALSPM dynamically selects a modulation combination according to time-varying wireless channel conditions...
Long Term Evolution (LTE) is a paradigm for mobile communication providing high speed data. The LTE terms provide a framework for enlarged capacity, enhanced spectrum efficiency and coverage as well as condensed latency as compared to the second and third generation wireless networks. Six downlink channels are used by LTE of which three are data bearing channels and the rest are control channels....
This paper proposes a hardware architecture of K-best-based 4 × 4 MIMO decoder that supports up to 256-QAM. The novelties such as Direct Expansion, and 2D Sorter play important roles on reducing the complexity of the decoder. In addition, the most complex operators such as divider and multiplier are eliminated in this design. As compared to the previous works, the proposed decoder achieves the highest...
The combination of low-density parity-check (LDPC) codes and bit-interleaved coded modulation (BICM) scheme, could easily break the bound of the cut-off rate and achieve capacity-approaching performance. To overcome the independent demapping loss in BICM scheme, the iterative demapping counterpart of BICM (BICM-ID) was further proposed. In this paper, we will present a viewpoint that the performance...
A bit error rate (BER) estimation-based adaptive space-time-frequency coded (STFC) multiband orthogonal frequency division multiplexing ultra-wideband (MB-OFDM UWB) wireless body area network (WBAN) system is proposed in this paper. It is designed to improve the average BER performance for high data rate applications while maintaining a reasonably high throughput in body-to-external links of a WBAN...
In this paper, we propose a new hardware-efficient ML decoding algorithm for a spatial modulation scheme which is basically constructed by serially concatenating maximum-ratio receive combiners with traditional slicers. With respect to complex multiplications, the new algorithm has a greatly reduced decoding complexity compared to the conventional one, especially, for higher-order modulation. This...
This paper presents a different perspective on the collective concept of software-hardware defined radio (SHDR) in cognitive radio (CR) networks. The SHDR is proposed considering the multiple hardware functionalities conceived by software defined radio, which generally reflects on the adaptable recognition of network services and operational conditions. An ad-hoc network scheme is envisaged as an...
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