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BER performance of MC-DS-CDMA systems in the …

This represents the performanceanalysis of MIMO MC-CDMA system when it hasusers 2, 4, 16, 32 and 64 users and 1T-1R,2T-2R,4T-4R,NT-NR on AWGN and Rayleigh channel.

The aim of our study is to find by means of compute simulations the pair of a receiver and a set of the spreading codes able to provide the best BER performance under the mentioned conditions. The simulation results shows that the maximum improvement of the MC-CDMA. This project is to investigate the MUD scheme, and realize a fully functional system in software for developing an algorithm for the detection of multi-users in CDMA system by using a noisy gradient approach. Several techniques are under consideration for the next generation of digital mobile systems, with the aim of improving cell capacity, multi path immunity and flexibilities. These include CDMA and OFDMA. Both these techniques could be applied to providing a fixed wireless system for rural areas. However, each technique as different properties, making it more suited for specific applications and this technique is implemented by MATLAB.

Thesis: frequency domain multiuser detectors for DS amd MC-CDMA cellular systems.

Download free e-book on error probability in AWGN

Now MC-CDMA system further improved by grouping with 2*4 MIMO system which uses ZF (Zero Forcing) decoder at the receiver to decrease BER with ½ rate convolutionally encoded Alamouti STBC block code is used as transmit diversity of MIMO through multiple transmit antenna.

MC-CDMA system is a single wideband frequency selective carrier which converts frequency selective to parallel narrowband flat fading multiple sub-carriers to enhance the performance of system.

Rayleigh multipath channel model - dspLog

Importance of using MIMO-MC-CDMA using convolution code is firstly to reduce the complexity of system secondary to reduce BER and lastly to increase gain.

In this paper we combine MIMO and MC-CDMA system to reduce bit error rate in which MC-CDMA is multi user and multiple access schemes which is used to increase the data rate of the system.

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