scholarly journals Polar codes over fading channels with power and delay constraints

2017 ◽  
Author(s):  
P. K. Deekshith ◽  
K. R. Sahasranand
Keyword(s):  
Fading Channels ◽  
Polar Codes ◽  
Delay Constraints

scholarly journals Improved Pilot Selection for Channel Estimation of Polar Codes in Wireless 5G

2019 ◽  
Vol 9 (2) ◽  
pp. 4978-4983
Keyword(s):  
Channel Estimation ◽  
Fading Channels ◽  
Communication Systems ◽  
Mimo System ◽  
Multiple Input Multiple Output ◽  
Poor Performance ◽  
Polar Codes ◽  
Selection Scheme ◽  
Polar Code ◽  
Pilot Selection

Fading channels learning about polar codes is great prominence. Knowledge of polar codes is very important while they are applied to the wireless communication systems. In fading Channels the communication through channel estimation which is an essential step for communication. The structure is constructed by a set of information bits for both systematic polar code and non-systematic polar code and the information set recognized frozen bits. In fading channels uneven pilot selection scheme and even pilot selection scheme are two pilot selection schemes are considered for polar codes. There is an improvement in decoding performance of polar codes using these selection schemes. In this choosing of coded symbols treated as pilots is a replacement of insertion of pilots. Polar codes have poor performance in fixed domain. So the EPS selection scheme can be active for tracing or channel estimation. The structure of polar code encoding is acapable structure and pilot selection is grave since whole selections cannot use the existing structure again. By conjoining the above advantages, pilot signals are selected without any addition from outside and insertion of pilot symbols impartial to estimation of the channel. Leveraging this, the DM-BS scheme is applyto multiple input multiple output (MIMO) system in frequency selective fading channel.

scholarly journals Combined Polar Codes and 2-12 QAM over AWGN and Rayleigh Fading Channels

2021 ◽  
Author(s):  
Flávia Camila Morais Oliveira ◽  
Maria de Lourdes Melo Guedes Alcoforado ◽  
Garik Markarian ◽  
Valdemar Cardoso da Rocha Júnior
Keyword(s):  
Fading Channels ◽  
Gaussian Noise ◽  
Communication System ◽  
Rayleigh Fading ◽  
Additive White Gaussian Noise ◽  
Error Correcting Codes ◽  
Rayleigh Fading Channels ◽  
Modulation Scheme ◽  
Polar Codes ◽  
Qam Modulation

Abstract This article investigates a communication system using polar codes combined with a 2-12 QAM modulation scheme over channels disturbed by additive white Gaussian noise (AWGN) as well as over channels disturbed by Rayleigh fading in addition to AWGN. The 2-12 QAM modulation is compatible with legacy 16 QAM still widely used, and when combined with appropriate error correcting codes produces results that approach the Shannon limit.

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