The high Peak to Average Power Ratio (PAPR) of Orthogonal Frequency Division Multiplexing (OFDM) and MIMO-OFDM systems reduces the system efficiency. In this paper, an extension of Tone Reservation (TR) method is introduced for PAPR reduction in Space Frequency Block Coded OFDM (SFBC-OFDM) systems. The proposed algorithm is based on a time domain kernel which is added to the signal of the anten...

ABSTRACT In this paper, we show the equivalence of Space-Time block coding to multipath propagation with respect to Cyclic Delay Diversity for OFDM systems. Hence, we can apply existing Space-Time code design criteria and analyze methods for Space-Time code construction using Cyclic Delay Diversity OFDM systems in multipath propagation environments. i.e. terms like "diversity gain" and "coding ...

In this paper, using the exact expression for the pairwise error probability derived in terms of the message symbol distance between two message vectors rather than the codeword symbol distance between two transmitted codeword matrices, the exact closed form expressions for the symbol error probability of any linear orthogonal space-time block codes in slow Rayleigh fading channel are derived f...

The two main cooperative protocols in WLANs are the orthogonal and non-orthogonal ones. We consider this two different cooperative protocols with the amplify-andforward (AF) and decode-and-forward (DF) strategies. In each case, we study the information theoretic performance. Simulation results show that the non-orthogonal cooperative protocol achieves an optimal performance than the orthogonal ...

In a fast fading channel, the orthogonality of the two consecutive Space Time Block Codes (STBC)-Orthogonal Frequency Division Multiplexing ( OFDM) symbols will be destroyed and the received signals cannot be perfectly separated. TR(Tone Reservation) is a technique designed to combat this problem by reserving a number of carries(tone) in the frequency domain to generate a cancellation signal in...

Transmitter diversity and down-link beamforming can be used in high-rate data wireless networks with orthogonal frequency division multiplexing (OFDM) for capacity improvement. In this paper, we compare the performance of delay, permutation and space–time coding transmitter diversity for high-rate packet data wireless networks using OFDM modulation. For these systems, relatively high block erro...

Orthogonal frequency division multiplexing (OFDM) is a popular technique to mitigate ISI caused by multipath fading effect of the radio channel. In practice, OFDM could be used in combination with space-time coding, which can be performed in a multiple-input multiple-output (MIMO) system, to increase the diversity gain and/or to enhance the system capacity over timevariant and frequency-selecti...

The demand for mobile communication systems with high data rates and improved link quality for a variety of applications has dramatically increased in recent years. New concepts and methods are necessary in order to cover this huge demand, which counteract or take advantage of the impairments of the mobile communication channel and optimally exploit the limited resources such as bandwidth and p...