In this paper, a transmit diversity technique using chip level space time block coding (chip-STBC) is investigated for the downlink transmission of multicarrier direct sequence code division multiple access (MC-DS-CDMA) based cognitive radio base station. Synchronous transmission of multiple users’ signals over fast fading frequency selective Rayleigh channel is considered. Conventional symbol ...

Space-time block coded OFDM is capable of achieving substantial diversity gains, while supporting high bit-rates in wireless communications. By concatenating a space-time block coded OFDM scheme with powerful channel codes, the performance of the system can be further enhanced. In this contribution both Low-Density Parity-Check (LDPC) coding and turbo coding assisted G2 space-time block coded O...

ORTHOGONAL SPACE TIME CODING FOR IM/DD OPTICAL WIRELESS COMMUNICATION WITH SINGLE CARRIER FREQUENCY DOMAIN EQUALIZATION

The success of applying generalized complex orthogonal designs as space-time block codes recently motivated the definition of quaternion orthogonal designs as potential building blocks for space-time-polarization block codes. Since complex orthogonal designs with no zero entries have proven important in applications, this paper offers a construction for an infinite family of restricted quaterni...

Recently, space-time block coding has emerged as a promising spatial transmit diversity scheme, mainly due to its simple decoding complexity. As it was initially proposed, spacetime block coding was based on the assumption of flat multipath fading channel, where there is no intersymbol interference. In this paper, we investigate the performance of two different receiver proposals using space-ti...

Over the last couple of years a number of spacetime block codes have been proposed for use in multiple transmit antennas systems. In this article we propose a method to extend any space-time code constructed for m transmit antennas to m p transmit antennas through GroupCoherent Codes (GCC). GCC make use of very limited feedback from the receiver (as low as one bit). In particular the scheme can...

Using the spatial modulation approach, where only one transmit antenna is active at a time, we propose two transmission schemes for two-way relay channel using physical layer network coding with space time coding using Coordinate Interleaved Orthogonal Designs (CIOD’s). It is shown that using two uncorrelated transmit antennas at the nodes, but using only one RF transmit chain and space-time co...

Relying on space-time linearly precoded orthogonal frequency-division multiple access (OFDMA) and exploiting both transmit and receive antenna diversity, we design herein multirate transceivers that guarantee deterministic symbol recovery with diversity gains regardless of the (possibly unknown) frequency-selective finite impulse response (FIR) channels and multiuser interference. Our approach ...

Multi-Antenna systems are expected to play very important role in future multimedia wireless communication systems. Such systems are predicted to provide tremendous improvement in spectrum utilization. In this paper we consider the capacity analysis of Multiple-Input Multiple-Output (MIMO) systems. Space-Time coding schemes are the practical signal design techniques to realize the information t...