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An approach to improve the performance of subspace-based channel estimation for multiple-input multiple-output (MIMO) systems is proposed. In a subspace-based channel estimation method, a small number of received blocks cause the residual error which affects the accuracy of the noise subspace because the covariance matrix is estimated from the received signal to find the noise subspace. To reduce...
We propose an algorithm to reject co-channel interference in 3GPP long term evolution (LTE) multiple input multiple output orthogonal frequency division multiplexing (MIMO- OFDM) systems. An improved channel estimation method and interference rejection algorithm are discussed. The interference information is measured on the pilot sub-carriers which are sent regularly in time and frequency. An improved...
Multiple-input/multiple-output (MIMO) frequency selective fading channels introduce both the intersymbol interference (ISI) and the inter-(sub)channel interference (ICI) that are the major performance limiting factors for MIMO wireless data communications. This paper focuses on joint suppression of such two interferences in receiver design under the criterion of the minimum mean-squared error (MMSE)...
Some communication applications, like multimedia, deliver data of different importance classes allowing unequal error protection (UEP) levels. In this paper, a multiple-input multiple-output (MIMO) system using orthogonal frequency division multiplexing (OFDM) is considered with a new UEP bit-loading algorithm based on the non-UEP algorithm by Chow, Cioffi, and Bingham. In the proposed bit-loading...
Effects of improved channel estimation are studied for a proposed IEEE 802.11n OFDM MIMO system. Three channel estimation methods are considered: maximum likelihood (ML), time-domain truncation (TDT) and model-based (MB). TDT and MB are particularly useful when the channel delay spread is short. For an MMSE receiver, MB shows a 1-2.5 dB improvement over ML on the packet error rate performance for...
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