Hybrid Channel Estimation Strategy for MIMO Systems with Decision Feedback Equalizer
نویسندگان
چکیده
We propose combining supervised and unsupervised algorithms in order to improve the performance ofmultiple-inputmultipleoutputdigital communication systemswhichmakeuseofdecision-feedback equalizers at the receiver. The basic idea is to avoid the periodical transmission of pilot symbols by using a simple criterion to determine the time instantswhen the performance obtained with an unsupervised algorithm is poor or, equivalently, those instants when pilot symbols must be transmitted. Simulation results show how the novel approach provides an adequate BER with a low overhead produced by the transmission of pilot symbols.
منابع مشابه
Layered space-time equalization for wireless MIMO systems
In this paper we investigate layered space-time equalization (LSTE) architectures for multiple-input-multiple-output (MIMO) frequency selective channels. At each layer or stage of detection, a MIMO delayed decision feedback sequence estimator (MIMO-DDFSE) is used to tentatively detect a group of selected data streams, among which a sub-group of data streams are output and are canceled from the ...
متن کاملPerformance Comparison of Linear and Decision Feedback Equalizers in Flat and Frequency Selective Fading Channel
In this paper we have studied channel models (flat fading and frequency selective fading channels) estimation, adaptive equalization, and demodulation. The technique involves the optimization of the overall impulse response of the transmit and receive filters and effectively reduces the channel to one which is flat fading. This example showed the relative performance of linear and decision feed...
متن کاملPerformance of Space-Time Processing Receivers for MIMO Antenna Systems
In this work we assess performance of multiple-input multiple-output (MIMO) antenna systems with space-time processing over a frequency-selective channel in presence of time-dispersive co-channel interference. We evaluate the performance of the conventional MIMO-decision-feedback equalizer (MIMO-DFE) receiver and also propose a low complexity receiver, based on the decoupled interference cancel...
متن کاملHybrid Two-Stage Decision-Feedback Equalization for Single-Carrier Multiple-Input Multiple-Output Systems
A single-carrier multiple-input multiple-output (MIMO) system with frequency-selective channels suffers from the inter-symbol interference (ISI) and the co-channel interference (CCI). To eliminate both type of interference, we propose in this letter a hybrid two-stage decisionfeedback equalizer (HTS-DFE), which performs the frequency-domain equalization (FDE) in the first stage and the layered ...
متن کاملAlgorithms for Space-Time Equalization of Wireless Channels
In this thesis we investigate receiver techniques for maximum likelihood (ML) joint channel/data estimation in flat fading multipleinput multiple-output (MIMO) channels. The performance of iterative least squares (LS) for channel estimation combined with sphere decoding (SD) for data detection is examined for block fading channels, demonstrating the data efficiency provided by the semi-blind ap...
متن کامل