A New Study of Channel Estimation Methods for OFDM in DVB-T2

In this paper three proposed methods of channel estimation are introduced. These methods are based on pilot-aided OFDM system with the arrangement employed in the DVB-T2 standard in time-varying frequency-selective fading channels. The first and second methods (low complexity and improved low complexity methods, respectively) are modified methods based on Domain Transform Least Square Estimation (DTLSE) method; which reduce the computational complexity by avoiding the use of the matrix inversion. The estimation matrix size for obtaining Channel Impulse Response (CIR) depends only on the length of the channel rather than the number of pilot sub-carriers or the size of OFDM symbols. The third method (high performance method), which is based on the first proposed method and a Two Dimensional Linear Interpolation 2-DIL method, uses one frame instead of one symbol and offers lesser complexity than the MMSE method, and a BER performance close to it

Channel estimation for MIMO-OFDM systems based on data nulling superimposed pilots

This paper proposes a new channel estimation algorithm based on data nulling superimposed pilots for the spatial multiplexing multiple-input-multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. In the proposed method each OFDM data symbol of each transmit antenna is spread over all subcarriers by using a spreading matrix then nulls are introduced at certain subcarriers to cancel the mutual interference between data symbols and superimposed pilots. At receiver accurate channel estimation can be easily acquired based on the superimposed pilots. Then the superimposed pilots are removed from the received signal and simple iterative data detection scheme is used to compensate the distortion which occurred in the data symbols. The simulation results of the proposed algorithm show improvement in the estimation accuracy, bit error rate (BER) and computational complexity compared to that of the conventional superimposed pilot technique. The simulation results also show that the performance of the proposed technique approaches that of the frequency division multiplexed pilots technique while having higher data rate and some excess in the receiver complexity

Improved periodogram-based spectrum sensing technique for FM wireless microphone signals

[abstract not available

Novel modified energy detection spectrum sensing technique for FM wireless microphone signals

[abstract not available