Abstract— In order to increase the diversity order of a multiantenna system at a moderate cost of complexity, one may choose Orthogonal Space-Time Block Coding (OSTBC). In this paper, OSTBC is combined with linear precoding matrices to improve the space-time-frequency diversity. Different linear precoding matrices based on either Fourier, Vandermonde or Hadamard constructions are proposed where...

In this paper, a cooperative algorithm to improve the orthogonal space-timefrequency block codes (OSTFBC) in frequency selective channels for 2 1, 2 2, 4 1, 4 2 MIMO-OFDM systems, is presented. The algorithm of three node, a source node, a relay node and a destination node is formed, and is implemented in two stages. During the first stage, the destination and the relay antennas receive the sym...

In this paper, a block code technique is proposed to increase the data rate and to reduce the symbol error rate for the wireless communication. The designed space time block code (STBC) is compared with golden code 2x2, silver code 2x2. STBC is used to realize the diversity gain and provide the remarkable performance in wireless communication systems using MIMO. STBC is based on improved Quasi ...

We document the performance of space– time block codes, which provide a new paradigm for transmission over Rayleigh fading channels using multiple transmit antennas. It has been shown that a complex orthogonal design that provides full diversity and full transmission rate for a space–time block code is not possible for more than two antennas. The objective of this paper is to provide the descri...

In rich scattering environments, wireless systems with multiple transmit and receive antennas (MIMO) offer large capacity gains. They are in general based on a parallel transmission of 1 ≤ M ≤ NT signal steams called layers (NT is the number of transmit antennas). If the channel is not known to the transmitter the best strategy would be to exploit transmit diversity for each layer. This ensures...

Orthogonal frequency division multiplexing (OFDM) has emerged as a modulation scheme that can achieve high data rates over frequency selective fading channel by efficiently handling multipath effects. This paper proposes receiver design for spacetime block coded MIMO OFDM transmission over frequency selective time-variant channels. Joint channel and data recovery are performed at the receiver b...

The WiMAX (Worldwide Interoperability for Microwaves Access) is a broadband wireless data communication technology based around the IEEE 802.16 standard providing high-speed data communication over a wide area along with cost effective access. MIMO-OFDM technology is a combination of multiple-input multipleoutput (MIMO) wireless technology with orthogonal frequency division multiplexing (OFDM) ...

This paper considers the problem of space-frequency code design for frequency-selective multiple-input-multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) modulation. We show that space-time codes achieving full diversity in quasistatic flat fading environment can be used to construct space-frequency codes that can achieve the maximum diversity available in frequency-select...