Wavelet Packet Modulation (WPM) is a multicarrier modulation technique like the well established Orthogonal Frequency Division Multiplexing (OFDM). It has several advantages over OFDM, such as flexibility of operation and excellent localization in frequency. The Channel Equalization for WPM is new and an unexplored research area. It is also different from equalization for OFDM because WPM symbo...

Partial Transmit Sequence (PTS) technique is an attractive technique for peak-to-average power ratio (PAPR) reduction of orthogonal frequency division multiplexing (OFDM) signals. However, optimum PTS (OPTS) requires an exhaustive search over all combinations of allowed phase weighting factors, resulting in high computational complexity. In this paper, we propose an Alternate Optimised Grouping...

This paper presents the performance analysis of VBLAST based multiple input multiple output orthogonal frequency division multiplexing (MIMOOFDM) system with respect to bit error rate per signal to noise ratio (BER/SNR) for various detection techniques viz zero forcing (ZF), minimum mean square error (MMSE) and maximum likelihood (ML). A 2X2 MIMO-OFDM system is used for the performance evaluati...

We study the performance of differential spacetime codes with linear constellation precoding (LCP) for orthogonal frequency division multiplexing (OFDM) cooperative networks over frequency selective channels. Through exploiting the unitary structure of the orthogonal STBCs, we design a low complexity differential STBC-LCP-OFDM receiver for cooperative networks. We assume the amplify-and-forward...

In this paper, we investigate different spatial transmit diversity concepts for orthogonal frequency division multiplexing (OFDM) systems. The idea is to artificially increase the frequency and time selectivity of the resulting channel transfer function at the receiver antenna by specific time-variant phase rotations of the signal at the transmit antennas. The achievable performance gains with ...

In this paper, it is proposed that to achieve higher data rates and to combat to effect of multipath propagation, orthogonal frequency division multiplexing system (OFDM) is a promising technique. OFDM allows many users to transmit in an allocated carrier. Each user is allocated several carriers in which to transmit their data.The transmission is generated in such a way that the carriers used a...

Orthogonal frequency division multiplexing (OFDM) system is widely used wireless communication system in recent years. The major drawback of OFDM system is high Peak-to Average Power Ratio (PAPR). To reduce the PAPR of OFDM system different PAPR reduction techniques have been proposed. In this paper, we are evaluating the performance of different non-linear companding techniques.

Orthogonal frequency division multiplexing (OFDM) is a special case of multicarrier transmission, where a single data stream is transmitted over a number of lower ratesubcarriers.4G and other wireless systems are currently hot topics of research and development in the communication field. Orthogonal frequency division multiplexing (OFDM) is the most commonly used modulation scheme for high data...

⎯The IEEE 802.16d communication standard uses orthogonal frequency division multiplexing (OFDM). In the widely used OFDM systems, the fast Fourier transform (FFT) and inverse fast Fourier transform pairs are used to modulate and demodulate the data constellation on the sub-carriers. In this paper, a high level implementation of a high performance FFT for OFDM modulator and demodulator is presen...

Orthogonal frequency division multiplexing (OFDM) modulation using orthogonal subcarriers reduces the delay spread by increasing robustness to multipath fading and can use overlapped bandwidth due to orthogonality on frequency domain. The main drawback of Orthogonal Frequency Division Multiplexing(OFDM) systems is the high peak-to average power ratio (PAPR),which significantly reduces the effic...