Multiple-input multiple-output (MIMO) wireless technology in combination with the orthogonal frequencydivision multiplexing (MIMO-OFDM) is an attractive air interface solution for next-generation wireless local area networks (WLANs). Among the various resources in MIMO multicarrier systems the multiplexing rate assignment is related to the rate of transmissions. Here we proposed a new hybrid cy...

A new multiple access scheme using Multi-Symbol Encapsulated Orthogonal Frequency Division Multiplexing (MSE-OFDM) is proposed. This is basically a time division multiple access (TDMA) technique utilizing the MSE-OFDM. The Bit Error Rate (BER) performance of the TDMA system using conventional OFDM is slightly better than that of the proposed system. This weakness is compensated as the proposed ...

We proposed a novel rate-1, space-frequency (SF) code for an Orthogonal Frequencey Division Multiplexing (OFDM) system with transmit (M ) and receive (N ) antennas that achieves the maximum diversity attainable over frequencyselective channels. Since the SF code symbol is transmitted in one OFDM block duration, it has smaller processing delay than previously proposed Space-Time-Frequency (STF) ...

High Peak to Average Power Ratio is one of the major drawbacks in Orthogonal Frequency Division Multiplexing (OFDM) which is used in Third Generation Partnership Project Long Term Evolution (3GPP LTE) in Downlink. In this paper, we review and analysis some pre-coding techniques in OFDM Keywords— OFDM, High Power Amplifier (HPA), PAPR

In orthogonal frequency-division multiplexing (OFDM) systems, synchronization issues are of great importance since synchronization errors might destroy the orthogonality among all subcarriers and, therefore, introduce intercarrier interference (ICI) and intersymbol interference (ISI). Several schemes of frequency offset estimation in OFDM systems have been investigated. This paper compares perf...

Orthogonal frequency-division multiplexing (OFDM) is a well-known technique for transmission of high rate data over broadband frequency-selective channels that mitigates intersymbol interference (ISI) caused by the delay spread of wireless channels. Space Frequency Block Coded technique (SFBC) is a spatial diversity technique used to achieve full transmission diversity with higher capacity. The...

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...

This article establishes a performance comparison between the OFDM (Orthogonal Frequency Division Multiplexing) and the SCCP (Single Carrier with Cyclic Prefix) systems from the interleaver point of view. Some interleavers schemes are analyzed in a block fading channel scenario, as well as in the context of deep fade static channels. Keywords— OFDM, SCCP, interleaving, frequency selective chann...

Ren et al. presented an efficient carrier frequency offset (CFO) estimation method for orthogonal frequency division multiplexing (OFDM), which has an estimation range as large as the bandwidth of the OFDM signal and achieves high accuracy without any constraint on the structure of the training sequence. However, its detection probability of the integer frequency offset (IFO) rapidly varies acc...

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.