Joint optimization of signal constellation bit labeling for bit-interleaved coded modulation with iterative decoding

2005 ◽  
Vol 9 (9) ◽  
pp. 775-777 ◽  
Author(s):  
N.S. Muhammad ◽  
J. Speidel
Keyword(s):  
Iterative Decoding ◽  
Coded Modulation ◽  
Joint Optimization ◽  
Signal Constellation ◽  
Bit Interleaved Coded Modulation

scholarly journals Performance of combined constellation shaping and bit interleaved coded modulation with iterative decoding (BICM-ID)

2011 ◽  
Vol 9 ◽  
pp. 195-201 ◽  
Author(s):  
T. Arafa ◽  
W. Sauer-Greff ◽  
R. Urbansky
Keyword(s):  
Iterative Decoding ◽  
Communication Systems ◽  
Forward Error Correction ◽  
Coded Modulation ◽  
Bandwidth Utilization ◽  
Signal Constellation ◽  
High Data ◽  
Constellation Shaping ◽  
Forward Error ◽  
Bit Interleaved Coded Modulation

Abstract. The increasing demand of achieving high data rates in modern communication systems requires highly efficient bandwidth utilization. For this purpose, multilevel modulation schemes are used in association with forward error correction (FEC) codes in order to approach the channel capacity. However, there is a gap between the capacity of a uniform signal constellation and the Shannon unconstrained capacity. This gap can be reduced by applying constellation shaping. The task of shaping is to modify a uniform distributed signal constellation towards a Gaussian like distribution. In this paper, we investigate different approaches to combine the constellation shaping with a bit interleaved coded modulation with iterative decoding (BICM-ID) system. Simulation results show that this combination can offer a shaping gain up to 0.6 dB.

THIẾT KẾ BỘ XÁO TRỘN CHO HỆ THỐNG BICM-ID TRUYỀN DẪN QUA KÊNH PHA ĐINH

2020 ◽  
pp. 59-68
Author(s):  
Thắng
Keyword(s):  
Iterative Decoding ◽  
Coded Modulation ◽  
Bit Interleaved Coded Modulation

Bài viết đề xuất một xáo bộ trộn bít (gọi là New-block) sử dụng trong hệ thống BICM-ID (Bit-Interleaved Coded Modulation with Iterative Decoding) trên kênh pha đinh Rayleigh. Nó mang lại cho hệ thống giá trị hiệu suất BER (Tỷ lệ lỗi bit) xấp xỉ với bộ xáo trộn bít giả ngẫu nhiên ở vùng sàn lỗi, nhưng có phần cứng đơn giản hơn.

An Improved Simplified-CE Stopping Criterion for BICM-ID System

2013 ◽  
Vol 846-847 ◽  
pp. 1262-1265
Author(s):  
Miao Miao Li ◽  
Jian Ping Li
Keyword(s):  
Iterative Decoding ◽  
Rayleigh Fading ◽  
Signal To Noise Ratio ◽  
Coded Modulation ◽  
Cross Entropy ◽  
Stopping Criterion ◽  
Transmission Scheme ◽  
Stopping Criteria ◽  
Bit Interleaved Coded Modulation ◽  
Efficient Transmission

Bit-interleaved coded modulation iterative decoding (BICM-ID) is an excellent bandwidth efficient transmission scheme,which owns remarkable bit-error-rate (BER) performance both in additive Gaussian noise (AWGN) channel and Rayleigh fading channel.But it leads to the increase of computational complexity and decoding delay at the receiver at the same time. In order to decrease the unnecessary iterations ,a variety of the stopping criteria are put forward . This paper presents an improved simplified cross-entropy (CE) stopping criterion based on Simplified-CE criterion, which calculates the value of CE just one time when Signal to Noise Ratio (SNR) is under 2dB to simplified the iterative process. Simulation results show that the improved Simplified-CE criterion can own the least iterative number when the SNR is under 2dB.And when the SNR is from 2.5dB to 4dB, it is about 12% less than CE criterion in the average iterative numbers.

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