The accuracy of channel estimation significantly affects the performance of coherent receiver in a DS-CDMA system. The receiver performance can be improved if an appropriate channel estimation filter is used according to the channel condition. In this paper, we consider the design of channel estimation filters for pilot channel based DS-CDMA systems. When a moving average (MA) FIR filter is use...

Multiple transmit and receive antennas can be used to form multiple-input multiple-output (MIMO) channels to increase the capacity by a factor of the minimum number of transmit and receive antennas. In this paper, orthogonal frequency division multiplexing (OFDM) for MIMO channels (MIMO-OFDM) is considered for wideband transmission to mitigate intersymbol interference and enhance system capacit...

Abstract: Accurate channel estimation is necessary for coherent detection and adaptive control techniques, e.g., adaptive modulation and demodulation, of multicarrier signals. In this paper, we study one-dimensional channel estimation in frequencyor time-domain and 2-dimensional channel estimation in time-frequency domain. It is shown that the frequency (time)-domain interpolation channel estim...

Orthogonal Frequency Division Multiplexing (OFDM) is multiplexing technology of orthogonal multicarrier, and the channel estimation model based on pilot in OFDM systems is analyzed; Now that, the channel estimation based on pilot needs interpolation, in order to reduce the complexity of the interpolation algorithm, the FFT channel estimation algorithm based on pilot is studied. Because of the d...

For TDD system, we propose a novel channel estimation method based on the third-order interpolation, the least-square approximation [1] and the partition of the training sequence. We also put forward a novel time slot, based on which the interpolation of the channel estimation can be performed in every TDD time slot. By using the novel channel estimation method and the novel time slot, the chan...

A joint channel estimation and data detection technique for a multiple input multiple output (MIMO) wireless communication system is proposed. It combines the least square (LS) training based channel estimation (TBCE) scheme with sphere decoding. In this new approach, channel estimation is enhanced with the help of blind symbols, which are selected based on their correctness. The correctness is...

Multicarrier modulation (MCM) is a promising technique for high rate data transmission. A one-tap equalizer is an essential part of the MCM system and the channel estimation is needed to get the coefficient of the equalizer, Lack of correct channel estimation may cause significant performance degradation. We propose to use the cyclic prefix to estimate the channel for the MCM system. We found t...

in this paper we focus on the tracking performance of incremental adaptive LMS algorithm in an adaptive network. For this reason we consider the unknown weight vector to be a time varying sequence. First we analyze the performance of network in tracking a time varying weight vector and then we explain the estimation of Rayleigh fading channel through a random walk model. Closed form relations a...

Coherent detection of received signals is required for turbo decoding. In this paper, we combine iterative channel estimation with Turbo decoding. Two combinations are considered in this paper. One is called outer-turbo channel estimation (OTCE), in which iterative channel estimation is carried out before turbo decoding. The other is called inner-turbo channel estimation (ITCE), in which channe...