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Cooperative communication offers a way to obtain spatial diversity in a wireless network without increasing hardware demands. The different cooperation protocols proposed in the literature are often studied under the assumption that all channel state information is available at the destination. In a practical scenario, channel estimates need to be derived from the broadcasted signals. In this paper,...
This paper presented novel Carrier Frequency Offset (CFO) acquisition together with multi-antenna channel estimation algorithms for burst-mode Multiple-Input Multiple-Output combined with Orthogonal Frequency Division Multiplexing (MIMO-OFDM) systems. The new algorithms take full advantage of some known channel information (for example, the length of channel impulse response L which can be estimated...
Space-alternating generalized expectation-maximization (SAGE) algorithm is proposed to compute the jointly maximum-likelihood estimate of the relative delay, incidence azimuth, and complex amplitude, which are considered the character parameters of impinging waves in indoor radio environments. The maximization processes of SAGE algorithm can be separated into several individual procedures which can...
OFDM modulation combines advantages of high achievable data rates and relatively easy implementation. However, for proper recovery of input, the OFDM receiver needs accurate channel information. Most algorithms proposed in literature perform channel estimation in time domain which increases computational complexity in multi-access situations where the user is only interested in part of the spectrum...
In this paper, we present a comparative study of the performance of the joint time of arrival/direction of arrival (TOA/DOA) estimation techniques - estimation of signal parameters via rotational invariance technique (ESPRIT), joint angle and delay estimation (JADE) and space-alternating generalised expectation maximisation (SAGE) - in the context of a strong multipaths model. We focus on a number...
This paper proposes a new iterative channel estimation algorithm for known symbol padding (KSP) orthogonal frequency division multiplexing (OFDM) based on the Expectation Maximization (EM) algorithm . The guard interval is filled with pilot symbols and the remaining part of the pilot symbols is put on some of the OFDM carriers. To start up the EM algorithm an initial channel estimate is obtained by...
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