دانلود رایگان مقاله انگلیسی مدولاسیون کدگذاری جاگذاری بیتی با رمز گشایی تکراری - IEEE 2018

Abstract

Polar Codes are a recently proposed class of linear block error correction codes. They are provably capacity achieving codes over Binary Discrete Memoryless Channels (B-DMC) and have hence garnered a lot of interest from the scientific community. It is also a proposed channel coding method for 5G technology. Bit-Interleaved Coded Modulation with Iterative Decoding (BICM-ID) is a well known design to improve the error correcting performance of underlying channel codes over continuous channels especially Additive White Gaussian Noise (AWGN) channels. The novel idea in this paper, is to combine these powerful error correcting techniques i.e. integrate Polar Codes in a BICM-ID design to produce a high performance Bit-Interleaved Polar Coded Modulation with Iterative Decoding (BIPCM-ID) system. The error correcting performance of such a BIPCM-ID system has been analyzed through simulations over AWGN channel and multiple modulation schemes. Additionally error floor removal has been implemented and system performance has been discussed.

VI. CONCLUSION

A novel BIPCM-ID system has been developed using a polar encoder (at the transmitter) and a polar decoder (at the receiver) within a BICM-ID design. This system has been analyzed over AWGN channels with N = 128 for coderate= 1/2 over BPSK and 16PSK modulation schemes. Implementing the system with these parameters, it has been observed that under proper configurations (parameter values),

1) with 5 iterations of ID, BER performance can be improved from its contemporary BIPCM system by at least 3.8 dB over BPSK modulation for very low BER.

2) with 5 iterations of ID, BER performance can be improved from its contemporary BIPCM system by at least 3 dB over 16PSK modulation for very low BER.

High code diversity is very important to be able to well utilize the potential of a BIPCM-ID system. With a higher number of codewords concatenated for bit interleaving, higher code diversity and lower correlation amongst transmitted bits of the same codeword is achieved. The performance of BIPCM-ID can further be improved by increasing the number of ID iterations. Using a differential modulation scheme removes the error floor altogether. Polar Codes as a stand-alone error correction technique are provably capacity achieving codes for B-DMCs especially BEC. They are not specifically designed for high performance error correction over continuous channels. However, by developing a BIPCM-ID system it has been proved that with the help of some additional error correcting modules, Polar Coding can be a high performance error correction method over continuous channels like AWGN as well.