the bit error rate (BER). Show that here companding technique using QPSK modulation gives better performance in BER as compare to DQPSK and BPSK modulation. This companding model is very efficient to gives the better bit error Rate in OFDM System. In this paper, evolution of performance of A-law and µ

Orthogonal Frequency Division Multiplexing (OFDM) has a high tolerance to multipath signals and is spectrally efficient making it a good candidate for future wireless communication systems. One disadvantage of OFDM is that the peak of the signal can be up to N times the average power (where N

A Bayesian approach to sparse channel estimation in

A carrier separated OFDM system is proposed to support high data rates in mobile multiple access environments. OFDM is considered to support high data rates and carrier separation is introduced to combat multipath fading. The performance is comparable to that of a frequency hopped OFDM system

The use of multi-amplitude signaling schemes in wireless OFDM systems requires the tracking of the fading radio channel. This paper addresses channel estimation based on time-domain channel statistics. Using a general model for a slowly fading channel, we present the MMSE and LS estimators and a

Link Adaptation for Orthogonal Frequency Division Multiplex (OFDM) systems is an important topic to achieve higher spectral efficiencies or better error rate performance. However, channel coding has been neglected previously, only gaining some attention recently. In this paper, an overview over

Abstract– – Communication methods are increasing day by day. Orthogonal frequency division multiplexing (OFDM) systems is one of the most recent emerging trends in wireless communication. However, the major drawback of OFDM is the high Peak-to-Average Power (PAPR) which results in the Bit Error

exchange of data between nearby vehicles or road side infrastructure. In this regards multiple input and multiple output (MIMO) orthogonal frequency domain multiplexing (OFDM) system is possibly the best solution. This paper deals with the performance analysis of the MIMO OFDM system in Nakagami-m channel

time that is longer than the delay spread of the channel, an OFDM system is able to mitigate intersymbol interference (ISI). Deploying an adaptive antenna array at the receiver can help separate the desired signal from interfering signals which originate from different spatial locations

The advantage of using orthogonal frequency division multiplexing (OFDM) over the single-carrier modulation is its ability to mitigate interference and fading without complex equalization filters in the receiver [1]. OFDM systems have a high peak-to-average ratio (PAPR) which results in a high