Modified Sphere Detection algorithm with decreased bit error rate and lower complexity

2008 ◽  
Author(s):  
F. Eshagh Hosseini ◽  
A. Salahi ◽  
S. Shirvani
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Detection Algorithm ◽  
Sphere Detection ◽  
Lower Complexity

A Novel Construction Method of QC-LDPC Codes Based on Generalized ACE Constrained

2013 ◽  
Vol 760-762 ◽  
pp. 1684-1689
Author(s):  
Hong Hao Zhao ◽  
Fan Bo Meng ◽  
Qing Qi Zhao ◽  
Jie Wang
Keyword(s):  
Computational Complexity ◽  
Bit Error Rate ◽  
Error Rate ◽  
Ldpc Codes ◽  
Excellent Performance ◽  
Frame Error Rate ◽  
Signal Noise ◽  
Extrinsic Message Degree ◽  
Lower Complexity ◽  
Simulation Results

Recently, structured LDPC codes have been focused on due to excellent performance and lower complexity. An improved construction of QC-LDPC based on a modified PEG algorithm is proposed in this paper. The modified Progressive Edge-Growth algorithm is a PEG algorithm with Approximated Cycle Extrinsic Message Degree (ACE) metric, which is used to describe the connectivity of cycles. The approach can maximize the girth of the cycles, improve the connectivity of cycles and have the advantages of QC algorithms. The simulation results demonstrate that the PEG algorithm based on ACE has lower Bit Error Rate (BER) and Frame Error Rate (FER) than the original PEG algorithm at the low Signal Noise Ratio (SNR) values, and has a relatively lower computational complexity.

Multi-User Detection Techniques for DS-CDMA UWB System

2011 ◽  
Vol 204-210 ◽  
pp. 872-878
Author(s):  
Nan Ping Liu ◽  
Xiang Bo Song ◽  
Ke Wen Xia ◽  
Yuan Shi
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Communication Systems ◽  
New Technologies ◽  
Detection Algorithm ◽  
Detection Performance ◽  
Ultra Wideband ◽  
Decision Threshold ◽  
Correct Decision ◽  
Detection Techniques

Ultra-wideband(UWB) is currently one of three new technologies of wireless communication. Multi-user detection technique is mainly used to eliminate multiple access interference（MAI）in DS-CDMA UWB communication systems. Linear multi-user detection algorithm for multi-access interference suppression or even elimination has certain results. But for a fixed decision threshold is set to 0, the detection performance of linear multi-user detection algorithm will be decreased significantly. Therefore a kind of multi-user detection with pre-processing has been researched. Through the pre-processing, we set dynamic threshold to direct decision the user's data bit information so as to solve the problem the linear multi-user detector’s decision threshold which is fixed impact the detection performance. We may get the global optimal solution though pre-processing of using the thought of the branch and bound algorithm and forcing rules. Then the original problem changes into a smaller multi-user detection problem, in order to get the aim of reducing MAI, increasing the probability of a correct decision and reducing the bit error rate. From the simulation experiment results, it is shown that it has a significant effect in system detection, because after pre-processing the probability of a correct decision has increased, and the bit error rate has been reduced.

scholarly journals Performance Enhancement of Bit Error Rate with Increased Capacity using Modified SIC-MUD for Polar Code based OFDM-IDMA System for 5G

2019 ◽  
Vol 8 (9S3) ◽  
pp. 192-200
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Interference Cancellation ◽  
Forward Error Correction ◽  
Performance Enhancement ◽  
Detection Algorithm ◽  
Available Bandwidth ◽  
Polar Code ◽  
Extensive Growth ◽  
Forward Error

In the era of mobile data revolution there is a mass-market of smart phones culminating into an extensive growth in mobile services and applications. However, bandwidth is limited and valuable resource available. In this paper hybrid combination of OFDM-IDMA system is proposed using polar code as forward error correction code and Gold code based interleaver. It presents a method to improvebit error rate with 10 users and normalizedcarrier frequency offsets of 0.1 to 0.5.The simulation is done in the presence of Rayleigh and AWGN channel with 64 QAM modulation technique. A modified successive interference cancellation multi-user detection algorithm is proposed to cater multiple access interference.It is observed that proposed system withnormalized CFO of 0.1 for10 users at required SNR of 15 dB enhances the bit error rate to 1.021*10-4over available existing systems. Hence the capacity of the system and data rate increases by three times to support multimedia application within available bandwidth.

Research of Sphere Decoding Detection Algorithm Based on Transmit Diversity

2013 ◽  
Vol 791-793 ◽  
pp. 1328-1332
Author(s):  
Dan Wang ◽  
Yuan Yuan Zhou ◽  
Xiao Wen Li
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Signal To Noise Ratio ◽  
Transmit Diversity ◽  
Detection Algorithm ◽  
Sphere Decoding ◽  
Ofdm System ◽  
Improve Performance ◽  
Single Tree ◽  
Mimo Ofdm

In MIMO-OFDM system, the traditional MRC algorithm is used for signal detection in transmit diversity mode ,this algorithm which assumes the same impulse response between adjacent sub-carriers and doesnt consider the noise ,has a higher bit error rate when signal-to-noise ratio is small ,based on this, this paper introduces a fast and effective single tree research sphere decoding detection algorithm and gives a detailed description of the algorithm ,simulation results show that the algorithm can reduce the bit error rate and improve performance.

Bit-Error-Rate Degradation Due to Inter-Channel Crosstalk of Different Signal Format

2019 ◽  
Vol E102.B (5) ◽  
pp. 1000-1004
Author(s):  
Naruki SHINOHARA ◽  
Koji IGARASHI ◽  
Kyo INOUE
Keyword(s):  
Bit Error Rate ◽  
Error Rate

ANALISIS SENSITIVITAS VIDEO MPEG-4 BERDASARKAN STRUKTUR FRAME PADA TRANSMISI DVB-T

2020 ◽  
Vol 25 (2) ◽  
pp. 86-97
Author(s):  
Sandy Suryo Prayogo ◽  
Tubagus Maulana Kusuma
Keyword(s):  
Deep Learning ◽  
Bit Error Rate ◽  
Error Rate ◽  
Signal To Noise Ratio ◽  
Similarity Index ◽  
Structural Similarity ◽  
Signal To Noise ◽  
Structural Similarity Index ◽  
Noise Ratio

DVB merupakan standar transmisi televisi digital yang paling banyak digunakan saat ini. Unsur terpenting dari suatu proses transmisi adalah kualitas gambar dari video yang diterima setelah melalui proses transimisi tersebut. Banyak faktor yang dapat mempengaruhi kualitas dari suatu gambar, salah satunya adalah struktur frame dari video. Pada tulisan ini dilakukan pengujian sensitifitas video MPEG-4 berdasarkan struktur frame pada transmisi DVB-T. Pengujian dilakukan menggunakan simulasi matlab dan simulink. Digunakan juga ffmpeg untuk menyediakan format dan pengaturan video akan disimulasikan. Variabel yang diubah dari video adalah bitrate dan juga group-of-pictures (GOP), sedangkan variabel yang diubah dari transmisi DVB-T adalah signal-to-noise-ratio (SNR) pada kanal AWGN di antara pengirim (Tx) dan penerima (Rx). Hasil yang diperoleh dari percobaan berupa kualitas rata-rata gambar pada video yang diukur menggunakan metode pengukuran structural-similarity-index (SSIM). Dilakukan juga pengukuran terhadap jumlah bit-error-rate BER pada bitstream DVB-T. Percobaan yang dilakukan dapat menunjukkan seberapa besar sensitifitas bitrate dan GOP dari video pada transmisi DVB-T dengan kesimpulan semakin besar bitrate maka akan semakin buruk nilai kualitas gambarnya, dan semakin kecil nilai GOP maka akan semakin baik nilai kualitasnya. Penilitian diharapkan dapat dikembangkan menggunakan deep learning untuk memperoleh frame struktur yang tepat di kondisi-kondisi tertentu dalam proses transmisi televisi digital.

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