scholarly journals Bit Error Rate Performance of a MIMO-CDMA System Employing Parity-Bit-Selected Spreading in Frequency Nonselective Rayleigh Fading

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Claude D'Amours ◽  
Adel Omar Dahmane
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Rayleigh Fading ◽  
Multiple Input Multiple Output ◽  
Cdma System ◽  
Multiple Input ◽  
Output Code ◽  
Input Multiple Output ◽  
Analytical Result ◽  
Code Division Multiple

We analytically derive the upper bound for the bit error rate (BER) performance of a single user multiple input multiple output code division multiple access (MIMO-CDMA) system employing parity-bit-selected spreading in slowly varying, flat Rayleigh fading. The analysis is done for spatially uncorrelated links. The analysis presented demonstrates that parity-bit-selected spreading provides an asymptotic gain of10log(Nt)dB over conventional MIMO-CDMA when the receiver has perfect channel estimates. This analytical result concurs with previous works where the (BER) is determined by simulation methods and provides insight into why the different techniques provide improvement over conventional MIMO-CDMA systems.

scholarly journals Improvement of BER performance in MIMO–CDMA systems by using initial–phase optimized gold codes

2013 ◽  
Vol 64 (1) ◽  
pp. 38-43 ◽  
Author(s):  
Ibrahim Develi ◽  
Meryem Filiz
Keyword(s):  
Fading Channels ◽  
Interference Cancellation ◽  
Initial Phase ◽  
Multiple Input Multiple Output ◽  
Cdma System ◽  
Gold Codes ◽  
Output Code ◽  
Input Multiple Output ◽  
Code Division Multiple ◽  
Ber Performance

This paper describes a new approach to improve the bit error rate (BER) performance of a multiple-input multiple-output code-division multiple-access (MIMO-CDMA) system over quasi-static Rayleigh fading channels. The system considered employs robust space-time successive interference cancellation detectors and initial-phase optimized Gold codes for the improvement. The results clearly indicate that the use of initial-phase optimized Gold codes can significantly improve the BER performance of the system compared to the performance of a multiuser MIMO-CDMA system with conventional nonoptimized Gold codes. Furthermore, this performance improvement is achieved without any increase in system complexity.

Bit Error Rate of Atmospheric Optical Multiple Input Multiple Output System with Pulse Position Modulation Under Influence of Combined Effect

2019 ◽  
Vol 56 (9) ◽  
pp. 090602
Author(s):  
张悦 Zhang Yue ◽  
王惠琴 Wang Huiqin ◽  
曹明华 Cao Minghua ◽  
雷景丽 Lei Jingli ◽  
王道斌 Wang Daobin
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Multiple Input Multiple Output ◽  
Combined Effect ◽  
Pulse Position Modulation ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Output System

Performance of 16QAM on UV Communication

2013 ◽  
Vol 475-476 ◽  
pp. 863-866
Author(s):  
Rui Zhu ◽  
Da Hai Han
Keyword(s):  
Wireless Communication ◽  
Bit Error Rate ◽  
Error Rate ◽  
Amplitude Modulation ◽  
Multiple Input Multiple Output ◽  
Modulation Method ◽  
Multiple Input ◽  
Communication Environments ◽  
Input Multiple Output ◽  
Mimo Technology

Explorations on ultraviolet (UV) communication field are relatively little among wireless communication for lacking of suitable simulation equipments. Possible mode was investigated on UV by combining mature coding techniques with gradually improved multiple-input multiple-output (MIMO) technology. A candidate modulation method, the 16-ary quadrature-amplitude modulation (16QAM), was analyzed for UV communication using MIMO technology. Comparisons between 16QAM and OOK were presented to better depict characteristics of 16QAM through simulation. The result shows that under specific bit error rate (BER) requirements for most communication environments, 16QAM can help save transmitting power and enlarges transmission capacity.

scholarly journals ANALISIS KINERJA KOMBINASI SISTEM CODE DIVISION MULTIPLE ACCESS MULTIPLE INPUT MULTIPLE OUTPUT DENGAN KODE PENEBAR WALSH PADA KANAL RAYLEIGH FADING

2018 ◽  
Vol 5 (2) ◽  
pp. 285
Author(s):  
I Gd. Tri Dharma Prawira ◽  
I.G.A.K. Diafari Djuni Hartawan ◽  
N. Pramaita
Keyword(s):  
Code Division Multiple Access ◽  
Multiple Access ◽  
Rayleigh Fading ◽  
Mimo System ◽  
Multiple Input Multiple Output ◽  
Walsh Code ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Code Division Multiple ◽  
Mimo Technology

The increasing human population are same to the need for telecommunications. Code Division Multiple Access (CDMA) is one of the most widely used telecommunications technologies. But with the increasing number of users, this technology is no longer able to meet the needs of users. With the required capacity requirements, the CDMA system and Multiple Input Multiple Output (MIMO) technology are merged.To find out the performance of a combined CDMA MIMO system, the system was tested by increasing the number of users and Signal to Noise Ratio (SNR) where the spreading code used was the Walsh code and the channel used was Rayleigh Fading modeling. The reference value used as material for consideration are the value of Bit Error Rate (BER).The method used in testing the CDMA MIMO system is the increase number of users, starting with a single user up to 16 users and SNR values from -15 dB to a maximum of 15 dB.Where all users will be combined with the CDMA technique then it will be sent using MIMO technology. The system will be tested using a simulation of the MatLab R2012a software.The results of the simulation show the performance of the CDMA MIMO system when using SNR that is increasing high, the BER will be lower or better used for communication. Whereas for simulations using a user that increases it results in a BER value that is almost the same because of the nature of the orthogonal Walsh code so that each user does not experience interference with other users.  

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