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This paper proposes a new approach to block spread OFDM called parallel concatenated spreading matrices OFDM (PCSM-OFDM). While BSOFDM improved the overall BER performance on OFDM in frequency selective channels, this new approach further improves the BER of BSOFDM by a 3 dB gain. This is achieved through increasing the diversity of the transmitted samples by concatenating two spreading matrices in...
We mathematically analyze the system capacity of one simple feedback scheme and two opportunistic feedback schemes: simple-feedback, max-feedback, and max-n-feedback schemes, in orthogonal frequency division multiple access (OFDMA) systems. The maximum signal-to-noise ratio (SNR) scheduling strategy can be used as a scheduling criterion at base stations (BSs). In the simple-feedback scheme, each user...
In this paper, we analyze statistical properties of the largest eigenvalue of correlated complex Wishart matrices. The results provide an analytical tool for the study of multiple-input multiple-output (MIMO) maximal ratio combining (MRC) systems in the presence of spatial fading correlation at the transmitter or receiver. Based on them, the exact closed-form expressions for the cumulative distribution...
In this paper, we mathematically analyze the performance of four different relaying schemes in cellular systems. We assume a downlink cellular system with fixed relays and a mobile station is either directly connected to a base station and/or connected to a relay station. We consider four different downlink data relaying schemes: a direct scheme, a relay scheme, a selection scheme, and a cooperative...
We present an analytical framework to evaluate the system capacity of two cellular systems in an interference-limited environment: a single-user system with and without other-cell interference and a multiuser system with and without other-cell interference. In a multiuser system, we adopt the multiuser diversity scheme. We derive closed-form expressions of the system capacity for the above four cases...
We present measured gains of spatial and angular diversity receivers for fixed narrowband wireless links at 2.4 GHz, in scenarios where indoor service is provided from an outdoor base station. We tested the performance of maximal ratio (MRC), equal gain (EGC) and selection (SC) combiners, and compared them to angular selection diversity using directive antennas. Spatial fading statistics were found...
In this paper, the error performance of an uncoded multiple-input-multiple-output (MIMO) scheme combining single transmit antenna selection and receiver maximal-ratio combining (the TAS/MRC scheme) is investigated for flat Nakagami-m fading channels with arbitrary values of m ges 1/2. The exact symbol error rate (SER) expressions are developed based on the moment generating function (MGF) method for...
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