MIMO-OFDM system is a new wireless broadband technology which has gained great popularity for its capability of high rate transmission and its robustness against multi-path fading and other channel impairments. Precise and competent channel estimation for MIMO-OFDM systems is necessary to improve error performance of the system. In this paper, Least Squares (LS) channel estimation is implemente...

The 60 GHz band is of much interest since this is the band in which a massive amount of spectral space (5 GHz) has been allocated unlicensed worldwide for dense wireless local communications. Orthogonal frequency division multiplexing (OFDM) has gained much popularity in the field of wireless communication because of its ability to transfer the data at higher rate, high bandwidth efficiency and...

Orthogonal frequency division multiplexing (OFDM) is a technique which are used in the next-generation wireless communication. Channel estimation in the OFDM technique is one of the big challenges, ever since high-resolution channel estimation can significantly improve the equalization at the receiver and consequently enhance the communication performances. Channel computation using superimpose...

This Paper is containing the different types of Channel Coding which is used in multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM). To increase the efficiency of MIMO-OFDM there are several channel coding are applied in it.in this paper the aim is to show the discussion about all channel coding which are used as well as using in MIMO-OFDM system. This paper is...

All existing training signal designs for channel estimation in OFDM systems assume no frequency offsets. In practice, frequency offset is unavoidable and seriously degrades the performance of OFDM systems. In this paper, we address the problem of designing optimal training signals for SISO OFDM channel estimation in the presence of frequency offsets. First, we present optimal training signals f...

In present of multi-path effect, the inter symbol interference (ISI) always exists in the OFDM/OQAM system and the preamble based channel estimation for the conventional orthogonal frequency division multiplex with cyclic prefix (CP-OFDM) is not feasible any more. Considering the characteristic of the extended Gaussian function (EGF), we propose two modified preamble based channel estimation by...

Recently, Constant Envelope Orthogonal Frequency-Division Multiplexing (CE-OFDM) has been considered as a promising transmission scheme for next generation mobile communications and radar applications due to its 0 dB peak to average power ratio (PAPR) and its inherent benefits to mobile transmitters and their power amplifiers. However, the issue of channel estimation in CE-OFDM still needs to b...

Orthogonal Frequency Division Multiplexing (OFDM) plays an important role in the implementation of high data rate communication. In this thesis, the problems of data detection and channel and carrier frequency offset estimation in OFDM systems are studied. Multi-symbol non-coherent data detection is studied which performs data detection by processing multiple symbols without the knowledge of th...

The aim of this paper is to compare the performance of Blind channel Estimation in OFDM with pilot based channel estimation. A blind channel estimation is presented for uncoded OFDM. In this method, four steps is done. The four steps are decision algorithm, channel impulse response estimation, channel frequency response estimation and data recovery. The decision algorithm first makes the primar...

Orthogonal Frequency Division Multiplexing (OFDM) converts a dispersive channel into parallel subchannels and thus facilitates equalization. But when the channel has nulls close to or on the FFT grid, OFDM faces serious symbol recovery problems. As an alternative to various error-control coding techniques that have been proposed to ameliorate the problem, we linearly precode (LP) symbols before...