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An efficient coded modulation diversity scheme is proposed to improve the performance of multiple-input-multiple-output orthogonal-frequency-division-multiplexing (MIMO–OFDM) systems in frequency-selective time-varying fading channels. By introducing the rotated modulation and space-time-frequency component interleavers, the proposed scheme globally optimizes powerful forward error correction codes,...
In the coexistence scenario of NB-IoT and LTE system, several factors affect the evaluating indicators of system performance. Considering the narrow bandwidth character of NB-IoT system, the simulation result would be over-optimistic if the evaluation method about ACLR and ACS in coexistence study of LTE system is still used. In this paper, a new evaluation method about ACLR and ACS is proposed aimed...
Faster-than-Nyquist (FTN) system provides higher throughput and spectrum efficiency, which is pivotal in future communication. Traditionally in Nyquist system, orthogonality of shaping waveforms is required in order to avoid inter-symbol interference (ISI). However, ISI is permitted in FTN system and thus the advantages of nonorthogonal pulses can be utilized. In this paper, two innovative ones, namely...
In order to reduce the outage probability of cooperative communication, a hybrid forwarding HARQ scheme in wireless network is proposed. In this scheme, if the relay decoding unsuccessfully until the last time, the Amplify-and-Forward protocol will be used to retransmit. Otherwise, the code cooperation will be used. Both of the Chase Combining and Incremental Redundancy combining is used in this scheme...
A network coding scheme employing nonbinary low density parity check (LDPC) product code with signal space diversity (SSD) is proposed in this paper. The scheme is based on a multiple access relay channel with two users, one relay and one base station. Rotated modulation and component interleaving are introduced in this scheme to realize SSD so that it can enhance the bit error rate (BER) performance...
Complex field network coding can earn larger diversity gain, better system reliability and higher network throughput in wireless communication with relay cooperative. An improved complex filed network coding scheme for large scale density network with user clustering and relay selection strategy will be proposed in this paper. The multiuser detector we employ is not based on maximum likelihood algorithm,...
The development of Internet of Things (IoT) is expected to be more rapid after the introduction of IEEE 802.11ah wireless local area network (WLAN) standard. IEEE 802.11ah standard is applicable to high-density WLAN system operating at sub 1 GHz band. In order to deal with the serious channel contention, collisions and hidden-node problems in the legacy distributed coordination function (DCF) protocol...
In this paper, the performance of precoded bit-interleaved coded modulation (BICM) spatial multiplexing multiple-input multiple-output (MIMO) system with spatial component interleaver is investigated. For the ideal precoded spatial multiplexing MIMO system with spatial component interleaver based on singular value decomposition (SVD) of the MIMO channel, the average pairwise error probability (PEP)...
Multiple input multiple output-orthogonal frequency division multiplexing (MIMO-OFDM) is the core technology for the next generation wireless local area network (WLAN). Broader coverage and higher spectral efficiency are the main goals of the next generation WLAN. Multi-user MIMO (MU-MIMO) is a promising way to meet this requirement. In this paper, a novel regularized block diagonalization (RBD) precoded...
For full-data exchange multi-way relay channels, a novel efficient multi-way relay network coding scheme is proposed. It is based on multi-stage two-way network coding, which is low-complexity and high reliable. For the channel without noise, the throughput per node per channel is increased by 50 % compared to plain routing, and even by 12.5% compared to the binary-signaling network coding scheme...
An efficient wireless transmission scheme with the signal space diversity (SSD) is proposed to improve the performance of multiple-input multiple-output (MIMO) systems in fading channels. By introducing the rotated modulation and space-time component interleaver, the proposed scheme jointly optimizes channel coding, modulation, and MIMO and can improve the link reliability and energy efficiency. An...
Cooperative communication enables collaborate mobile terminals to share each other's antennas to construct a virtual multiple-input multiple-output (MIMO) system. Through partitioning a user's code word into two parts, coded cooperation (CC) method integrates cooperation with channel coding and significantly improves the performance. In this paper, CC method is extended to spatial-multiplexing-based...
In this paper, a new and efficient decoding architecture, Single-Scan Layer Decoding (SLD), is realized in FPGA for multi-rate Quasi-Cyclic LDPC (QC-LDPC) codes. The SLD algorithm simplifies the nodes updating process and messages storing process of the offset min-sum algorithm, speeding up the decoding process and reducing nearly a half of resources consumption. Besides, the SLD algorithm, introducing...
An efficient component-interleaved nonbinary Low Density Parity Check Code (LDPC) scheme is proposed, which can significantly outperform the binary LDPC codes scheme without a component interleaver on fading channels. In this paper, the bit-error-rate (BER) performances of nonbinary LDPC codes are compared with the binary LDPC codes on the independent Rayleigh fading channel. And then we use a fast...
Using network coding, multiple-access relay channel makes a breakthrough at its performance. In order to further improve the performance of the uplink, a bit-interleaved coded modulation scheme with iterative decoding (BICM-ID) using joint coding differential modulation is designed. Specifically, it uses DE-16QAM of gray mapping mode matched with convolution code. Research has proved that in terms...
This paper introduced a corresponding iterative decoding scheme at base station and a bitwise interleaver at the user station and relay to reduce the impact of interference and fading on the network coded cooperation in the uplink multiple-access relay systems. The authors compare the experimental performance of MARC (multiple-access relay channel) network coding over Rayleigh fading channel. The...
An optimized LDPC-product network coding scheme is proposed for a multiple-access relay system with two users, one relay station (RS) and one base station (BS). In the first stage, these two users broadcast their LDPC-coded data packets in turn to the RS and the BS. In the second stage, the RS uses LDPC product code to combine the decoded packets from these two users and generate extra redundancy...
As compared with Orthogonal Frequency Division Multiple Access (OFDMA) scheme, Single Carrier Frequency Division Multiple Access (SC-FDMA) scheme exhibits very low peak-to-average power ratio (PAPR). As a SC-FDMA scheme, Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) has been adopted for uplink transmission in the third Generation Partnership Project-Long...
In digital communications, 90 or 180 degree phase ambiguity between the receiver and transmitter carrier is a serious problem for the coherent demodulation. To remove their phase ambiguity, differential quadrature phase shift keying (DQPSK) was proposed with the cost of a remarkable 2.4 dB performance degradation. Based on the iterative decoding (ID) scheme, an efficient joint convolutional code (CC)-coded...
An efficient method of constructing irregular quasi-cyclic (QC) low-density parity-check (LDPC) codes is proposed. In order to find the degree distribution with low convergence threshold, the extrinsic information transfer (EXIT) chart is utilized to optimize the degree distribution of LDPC codes. Then, a modified progressive edge growth (PEG) algorithm is used to get the mask matrix with the optimal...
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