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A Noisy Independent Component Analysis (ICA) based method for detection in the compound system MIMO-OFDM and in the context of CDMA is proposed. Noisy-ICA algorithm is used as a post processor attached to a subspace based CDMA receiver in the presence of Gaussian noise. The proposed architecture of the detector reduces the bias caused by the channel noise and further decreases the noise by dimensionality...
Multiple access interference (MAI) is the major limiting factor for the channel capacity especially when it is desired to have large number of users (overloaded) in DS-CDMA system. We propose a scheme which removes MAI with very little computations. The scheme is based on two requirements, firstly, presence of a user called `Pseudo-user' whose data is already known to the receiver and secondly, cross-correlation...
Subspace based blind channel estimation for OFDM systems has received considerable attention. Existing schemes mainly exploit inherent redundancy such as cyclic prefix and virtual subcarriers or artificial redundancy generated by pre-coding. In this paper, OFDM and multicarrier CDMA systems are considered. Frequency-domain oversampling is used at the receiver to perform detection and channel estimation...
In this paper, we propose a frequency distribution optimal diversity system to improve the frequency diversity gain in frequency-selective fading. The partial block MC-CDMA is a technique to improve performance. It functions by obtaining frequency diversity gain while avoiding ICI (inter code interference) through despreading of code in the receiver, after transmitting the same data in a different...
This paper proposes a new approach to apply singular value decomposition (SVD) in fractionally spaced frequency domain equalizer (FSFDE) for the single carrier MIMO-CDMA systems. Multiple data streams can be reliably transmitted through the parallel subchannels by using SVD, which can improve the capacity effectively without increasing frequency bandwidth or the average transmit power. Fractional...
In this paper, we propose a new algorithm for the carrier frequency offset (CFO) estimation of the uplink of multicarrier DS-CDMA (MC-DS-CDMA) systems. Firstly, our method exploits a new pilot scheme to obtain the approximation of the interested userpsilas signal from the composite signals on the user specific subcarrier in the receiver. Then the fast Fourier transform (FFT) operation is applied to...
RF power amplifiers (PA) of wireless communication systems are usually driven in their nonlinear region to obtain a higher efficiency. The price paid for the increased efficiency is the distortion of the transmission signal. To fulfill a given spectral mask for the transmission signal and to avoid an unacceptable high bit-error rate on the receiver side, the amplifier must be linearized. If wideband...
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