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We consider the problem of transmitting correlated data after independent encoding to a central receiver through orthogonal channels. We assume that the channel state information is not known at the transmitter. The receiver has access to both the source correlation and the channel state information. We provide a generic framework for analyzing the performance of joint iterative decoding, using density...
Two rate-one differential quasi-orthogonal space-frequency trellis codes (DQOSFTCs) for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) channels are proposed. The DQOSFTCs are systematically constructed within an OFDM symbol period, by combining unitary quasi-orthogonal trellis codes and differential modulation over the frequency domain (DF-QOSFTC) or time domain...
In this paper, a beamforming scheme combined with quasi-orthogonal space-time block codes (QOSTBC) is proposed. At the transmitter, quasi-orthogonal space-time block coding signals is transmitted by using four independent transmit beams. As the receiver, a pairwise decoding algorithm is employed. A flat Rayleigh fading channel model is used in the simulations to compare performance of the proposed...
In this paper we introduce an improved version of the turbo layered orthogonal lattice detector (T-LORD), recently presented. This implementation, namely K-Best T-LORD, misses the performance of the turbo MAP detector by only few tenths of dB in various configurations, like the fully enhanced T-LORD. However, its complexity is quadratic in the number of transmitting antennas instead of exponential...
In order to reduce out-of-band emission and PAPR for Multi-carrier (MC) CDMA system, bi-orthogonal modulation is one of the efficient schemes. However the performance of the scheme rapidly degrades if Hadamard code selection errors are occurred at the receiver. We propose and examine a frequency domain error correction scheme for the system employing Reed-Solomon (RS) code. This basic concept is that...
This paper proposes a low complexity differential modulation scheme for multiple-antenna systems where neither the transmitter nor the receiver knows channel knowledge. Our scheme is based on quasi-orthogonal codes. We consider a wireless system with four transmit antennas. At the transmitter, symbol pairs are jointly mapped to construct quasi- orthogonal codes and the codes are used to perform differential...
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