Gaussian noise channel

Part 1 book "Fundamentals of communication systems" includes content: Introduction, signals and linear systems, amplitude modulation, angle modulation, probability and random processes, effect of noise on analog communcation systems, analog to digital conversion, digital modulation methods in an additive white gaussian noise channel.

505p muasambanhan06 03-02-2024 6 2   Download

The error-correcting capabilities of regular LDPC (Low Density Parity Check) codes and BCH (Bose-ChaudhuriHocquenguem) codes are examined. The qualitative analysis and the quantitative assessment of error-correcting abilities are performed for LDPC codes with code word length n=1000 bits and BCH codes with code word length n=1023 bits. The code rates of LDPC and BCH codes are determined for a known signal to noise ratio in the gaussian channel; detected code rates are optimal for predefined modulation type and required information reliability on the receiver side.

5p son248 23-04-2020 56 0   Download

Transceiver system based on N-PSM using PSWF and Hermite has been implemented in MATLAB and compared in this paper. Performance evaluation of the N-PSM is carried out over Additive White Gaussian Noise (AWGN) channel for different values of N to measure Bit Error Rate (BER). It has been found that a combination of PSWF and Hermite pulses can be used for highspeed modulation if these pulses are orthogonal to each other since both the types of pulses achieve same bit error rate over AWGN.

6p blossom162 31-03-2019 24 0   Download

This paper presents a simulation based study of a wireless communication system with the implementation of secured asymmetric RSA cryptographic encryption/decryption algorithm on text message transmission. The system under investigation incorporates 2/3-rated CRC channel coding and QPSK digital modulation over an additive white Gaussian noise (AWGN) channel. For tackling the security problems a text message is first RSA encrypted at the transmitter while it is decrypted at the receiver end and compared for different levels of SNR.

6p byphasse043256 21-03-2019 26 0   Download

Given the observation vector , perform a mapping from to an estimate of the transmitted symbol, , such that the average probability of error in the decision is minimized.Signal vector is deterministic. Elements of noise vector are i.i.d Gaussian random variables with zeromean and variance . The noise vector pdf is

21p doanhung_dtvtk10 24-03-2013 61 5   Download

Tạo vài hạt tuyết cho nó thêm lạnh. -Tạo một layer mới :Layer - Dublicate Layer , fill màu đen - Chọn Filter - noise - Add noise với thông số: Amount: 60%, Distribution: chọn Gaussian - Chọn Filter - Blur - Gaussian Blur với thông số là: 2.0 pixels - Chọn Image - Adjustment - Levels với thông số: Channel: RGB Input Levels: 0; 0.5; 255 Output Levels: 0; 255 9 - Chọn Image - Adjustment - Brightness/Contrast với thông số:

7p phuoctam37 11-07-2011 51 3   Download

Tạo vài hạt tuyết cho nó thêm lạnh. -Tạo một layer mới :Layer - Dublicate Layer , fill màu đen - Chọn Filter - noise - Add noise với thông số: Amount: 60%, Distribution: chọn Gaussian - Chọn Filter - Blur - Gaussian Blur với thông số là: 2.0 pixels - Chọn Image - Adjustment - Levels với thông số: Channel: RGB Input Levels: 0; 0.5; 255 Output Levels: 0; 255 9 - Chọn Image - Adjustment - Brightness/Contrast với thông số:

7p bichtram865 28-05-2011 78 7   Download