Qingshuang Zhang

Practical Design and Decoding of Parallel Concatenated Structure for Systematic Polar Codes

In this paper, a parallel concatenated structure is proposed to improve the performance of polar codes in finite length in which multiblocks systematic polar codes (SPC) and recursive systematic convolutional codes (RSC) are combined. We first design a weighted iterative decoding algorithm for the proposed structure such that better bit error rate performance can be obtained. Then, a deliberated interleaver is optimized for the new scheme. Thereafter, we introduce a strategy to estimate the minimum distance of the concatenation codeword, where an asymptotic performance and convergence behavior analysis are elaborated. Finally, the error performance of the proposed scheme is evaluated via simulations. The results show that our scheme almost outperforms all the existed concatenation ones using polar codes, making the codes more practical.

Concatenated polar codes based on selective polarization

In this paper, we propose a selectively polarized concatenation structure for polar codes. We first divide the polarized bit-channels into three types, i.e., good, intermediate and bad bit-channels according to their Bhattacharyya parameter. Then, through combining several information blocks, the intermediate bit-channels are further polarized to enhance polarization rate. Theoretical and numerical results indicate that the proposed scheme achieves the same capacity as original polar codes at the same length, while the bit error rate (BER) performance is better than that of original polar codes as same decoding delay is considered. The polar codes can be used in the cognitive radio system.

Codes design based on EXIT chart for polar coded BICM-ID

Polar codes are applied to bit-interleaved coded modulation system with iterative decoding (BIPCM-ID) system. To optimize the iterative decoding performance, conventional polar coding construction is modified by extrinsic information transfer (EXIT) chart methodology. Simulation results show that BIPCM-ID system based on the proposed technique can outperforms BIPCM over 16-ary quadrature-amplitude with 1 dB.

An ARQ-aided polar coding scheme for security transmission of the wiretap channel

In this paper, an Automatic Repeat Request (ARQ)-aided secure polar coding scheme for the wiretap channel is proposed, where the frozen bits of the codes are obtained through the feedback of the legitimate recipient. Then, security of the proposed scheme is investigated, and analytical work proves that, both the reliability condition and security condition can be satisfied, specifically for the non-degraded wiretap channel. Finally, some simulation results reveal that the proposed scheme can transmit confidential messages reliably and securely.

On the Detection Algorithm for Faster-than-Nyquist Signaling

FTN has been proposed for several decades, and it is attractive for the reason that it can boost the symbol rate without changing the power spectral density. Actually, FTN has been used in some 5G standards. FTN signaling detection is an important element in FTN signaling scheme. In this paper, we shall introduce some FTN signaling detection algorithms that were proposed in literatures.

Analysis and Adaptive Design of Polar Coded HARQ Transmission Under SC-List Decoding

A novel polar coded hybrid-ARQ (PC-HARQ) transmission with chase combining utilizing powerful successive cancellation list decoder (HARQ-CC-SCL) is explored. We propose that by applying the distance spectrum of polar code to evaluate its frame error rate, the bounds of throughput and average transmission number can be derived. Then, this letter proposes an adaptive scheme combining the list size-manageable SCL decoding with ARQ protocol. Simulations indicate that the proposed HARQ-CC-SCL obtains a considerable throughput improvement of PC-HARQ-CC system, and approaches those of HARQ schemes with incremental redundancy through less transmission times for each packet. Meanwhile, the adaptive version achieves high throughput and good flexibility in practical applications without significant increase of complexity.

Multi-stack Decoding of Polar Codes

A successive cancellation multi-stack (SCMS) decoding is proposed to improve the performance of polar codes. Unlike the successive cancellation stack (SCS) decoding algorithm which just uses one ordered stack to store the candidate partial paths and attempts to find out the optimal estimation in the stack, the SCMS algorithm uses several stacks to obtain better performance at the same space complexity. Simulation results in binary-input additive white Gaussian noise channel (BI-AWGN) show that the SCMS algorithm can achieve an improvement of about 0.2 dB.