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In the existing literatures on cooperative relay system, the coding scheme adopts the conventional fixed-rate code (traditional code). This paper first studies the rateless code, Raptor code, to cooperative wireless cellular system. In particular, we study the efficiency, reliability, and robustness of cooperative communication in a wireless cellular downlink environment by employing a new scheme...
Combined equalization based on combination of pre and post equalizations in a multicarrier interleave division multiple access (MC-IDMA) system, is described. The channel pre-equalization is constrained to keep transmitted power unchanged. Combined-equalization requires explicit channel state information (CSI) both at the mobile station and the base station. A low complexity uplink channel estimation...
Knowledge of the error process and related channel parameters in wireless networks is invaluable and highly instrumental in a broad range of applications. Under the IEEE 802.15.4 Low Rate-Wireless Personal Area Networks (LR- WPAN) standard, compliant devices are capable of providing two pieces of information about the channel conditions along with each received packet, the Link Quality Indication...
In this paper, we present a precoder design framework and a computationally simple precoding technique for OSTBC based MIMO wireless systems with both transmit and receive correlations for the case of Rayleigh fading. It is assumed that the correlation among receive antennas is independent of the correlation among transmit antennas (and vice versa). The transmit and receive correlation matrices are...
In this paper we derive optimal power allocation (PA) in space and time that minimizes BER for transmitter selection in multi-input-single-output (MISO) Rayliegh fading channels assuming perfect channel state information (CSI) is available at receiver and transmitter. This power allocation scheme achieves exponential diversity order with a single RF front end and requires feedback of the best channel...
The design of signal constellations for a communication system using multiple transmitter antennas over a Rayleigh-fading channel is considered under the assumption that no channel state information (CSI) is available at the transmitter and the receiver has acquired a CSI estimate with known error covariance. This setup encompasses the well-studied scenarios of perfect and no channel knowledge at...
A modification of Vertical Bell-Labs Layered Space Time (V-BLAST) is presented in this paper, which adopts distinct transmit data rate on different data stream on the basis of the theoretical derivation of the optimal bit error rate (BER) performance for open-loop V-BLAST. Simulation results show that this scheme may provide a significant reduction in BER averaged over all detection stages compared...
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