Alamouti Scheme

The premise of this project is to provide a proof of
concept of Alamouti’s remarkably celebrated 2x1 transmit
diversity scheme with the aid of Software Defined Radios. We
aim at producing the same results as Alamouti, in an
environment that behaves as a frequency selective and slow
fading channel. The software-defined radios provide a
remote RF front-end to conduct this experiment however; the
real encoding and combining are done through Simulink
natively on external host machines

In next generation wireless communication and mobile systems" main requirement is to achieve higher data rates also with maximum bandwidth utilization. Now, for that MIMO communication method is used. In this paper, we represent EXTENDED ALAMOUTI scheme with 4X4 diversity order which is one of the diversity schemes used in order to improve the error performance. This paper discuses the error performance of this new diversity method on different fading channels mainly AWGN, RICIAN fading channel, RAYLEIGH fading channel and NAKAGAMI fading channel. This paper represents the error performance comparison of this new scheme and ALAMOUTI scheme with 2XM diversity order over all four fading channels with ML detector. This paper also represents the comparison among all four fading channel to elaborate the difference between them by using BER vs. SNR graph.

Increasing data rate and high performance is the target focus of wireless communication. The multi
carrier on multi-hop communication system using relay's diversity technique which is supported by a
reliable coding is a system that may give high performance.
This research is developing a model of multi user and two scheme of multi carrier CDMA on multi hop
communication system with diversity technique which is using Alamouti codes in Rayleigh fading channel.
By Alamouti research, Space Time Block Code (STBC) for MIMO system can perform high quality signal
at the receiver in the Rayleigh fading channel and the noisy system. In this research, MIMO by STBC is
applied to single antenna system (Distributed-STBC/DSTBC) with multi carrier CDMA on multi hop
wireless communication system (relay diversity) which is able to improve the received signal performance.
MC DS CDMA on multi hop wireless communication system with 2 hops is better performing than MC
CDMA on multi user without Multi User Detector. To reach BER 10-3 multi hop system with MC CDMA
needs more power 5 dB than MC DS CDMA at 5 users using Alamouti scheme for symbol transmission at
the relay.

In this paper, we investigate the performance of the multi-input-multi-output (MIMO) relaying scheme, which combines the Alamouti code with fixed decode-and-forward (DF) protocol. Based on the relationship between the overall signal-to-noise ratio (SNR) of the ...

Currently the wireless domain is changing very tremendously with a huge demand of highest data rate and lowest error rate. Certain improvement require in system efficiency in terms of capacity and error rate. Two of such strong wireless contenders are the WIMAX system and the DVB systems the research work is basically on making the current 4g standards more efficient by the implementation of antenna diversity techniques such as MIMO-ALAMOUTI and MIMO-VBLAST. The two MIMO techniques have been implemented into it so as to make it more efficient by exploiting their advantages into it and comparing these techniques with currently working techniques SISO.

In this paper, the impact of Forward Error Correction (FEC) code namely Trellis code with interleaver on the performance of wavelet based MC-CDMA wireless communication system with the implementation of
Alamouti antenna diversity scheme has been investigated in terms of Bit Error Rate (BER) as a function of Signal-to-Noise Ratio (SNR) per bit. Simulation of the system under proposed study has been done in M-ary modulation schemes (MPSK, MQAM and DPSK) over AWGN and Rayleigh fading channel incorporating Walsh Hadamard code as orthogonal spreading code to discriminate the message signal for individual user. It is observed via computer simulation that the performance of the interleaved coded based proposed
system outperforms than that of the uncoded system in all modulation schemes over Rayleigh fading channel

In this paper, we investigate the performance of the multi-input-multi-output (MIMO) relaying scheme, which combines the Alamouti code with fixed decode-and-forward (DF) protocol. Based on the relationship between the overall signal-to-noise ratio (SNR) of the ...

In this paper, the impact of Forward Error Correction (FEC) code namely Trellis code with interleaver on the performance of wavelet based MC-CDMA wireless communication system with the implementation of Alamouti antenna diversity scheme has been investigated in terms of Bit Error Rate (BER) as a function of Signal-to-Noise Ratio (SNR) per bit. Simulation of the system under proposed study has been done in M-ary modulation schemes (MPSK, MQAM and DPSK) over AWGN and Rayleigh fading channel incorporating Walsh Hadamard code as orthogonal spreading code to discriminate the message signal for individual user. It is observed via computer simulation that the performance of the interleaved coded based proposed system outperforms than that of the uncoded system in all modulation schemes over Rayleigh fading channel.

In this paper, we investigate the performance of the multi-input-multi-output (MIMO) relaying scheme, which combines the Alamouti code with fixed decode-and-forward (DF) protocol. Based on the relationship between the overall signalto-noise ratio (SNR) of the system and that of the weakest hop, the closed-form expressions of outage probability and bit error probability for M PSK are derived. The analysis reveals that this scheme achieves the best performance in a limited hop under the spectral efficiency constraint. Various simulation results are performed to verify the analytic ones demonstrating the accuracy of the theoretical approach.