The description and performance analysis of a new OFDM/DQPSK signal receiver is considered in this paper. The proposed receiver has performance that is close to the performance for the coherent detection of the OFDM/DQPSK signal, in case of zero carrier frequency offset. In case of non-zero frequency offset, receiver with decision feedback differential detection (DFDD-OFDM) is often used in the...

Abstarct In this paper, combination of channel, receiver frequency-dependent IQ imbalance and carrier frequency offset estimation under short cyclic prefix (CP) length are considered in OFDM system. An adaptive algorithm based on the set-membership filtering (SMF) algorithm is used to compensate for these impairments. In short CP length, per-tone equalization (PTEQ) structure is used to avoid i...

During Multicarrier transmission in OFDM(Orthogonal Frequency Division Multiplexing), the signal suffers due to fading environment and results in timing and frequency errors at the receiver end. An efficient timing and frequency offset estimation algorithm has been designed in VHDL using ISE XILINX 10. 1. The maximum value at which the timing offset is achieved and input signal with a delay are...

In the wireless transmission systems based on orthogonal frequency division multiplexing (OFDM), timing offset exists between the transmitter and the receiver. As the transmission speed increases the greater the influence of the timing offset. This paper examines the estimation of a timing error detector that carries out offset detection (i.e., estimation) and compensation in the receiver.

For increasing time values, isochrons can be regarded as expanding wavefronts and their perpendicular lines as the associated orthogonal isochron rays. The speed of the isochron movement depends on the medium velocity and the source-receiver position. We introduce the term equivalent-velocity to refer to the speed of isochron movement. In the particular case of zero-offset data, the equivalent ...

The orthogonality between sub-carriers in OFDM systems is disrupted by offsets between the carrier frequencies in the transmitter and receiver as well as by the so-called IQ mismatch in the mixers. When treated separately, effective algorithms exist for estimation and compensation of frequency offset as well as IQ imbalance. However, with both effects present, such algorithms do not lead to use...

The Orthogonal Frequency Division Multiplexing (OFDM) system have some problems such as carrier frequency offset, timing offset, and Peak to Average Power Ratio (PAPR). The impacts of these problems results into inter carrier interference (ICI) which affects the bit error rate (BER). Therefore, suitable methods are required to mitigate ICI at the receiver. In this paper a new pulse shape, by mo...