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In the Multiple Input Multiple Output (MIMO) systems, the receiver performance is greatly affected by Antenna Gain Imbalance (AGI). This paper proposes an novel AGI detection algorithm based on the Least Square (LS) channel estimation. The AGI parameter is accurately obtained after eliminating the influence of noise from the channel through the long-term statistics. Moreover, a compensation algorithm...
In the paper, a modified Log-MAP algorithm based on a novel approximation of the max* operator derived from the Jensen inequality is proposed. In this approach, the max* operation is performed on n≥2 arguments, thus the recursive calculations are avoided and significant reduction in the number of operations performed per decoding step, as compared with the conventional Log-MAP, is achieved. Simulation...
This paper presents an efficient multiuser Multiple Input Multiple Output (MU-MIMO) detection algorithm. It introduces Cholesky Decomposition (CLD) and deploys Successive Interference Cancellation (SIC) detection. This study reveals that the proposed algorithm delivers equivalent performance to the QR Decomposition (QRD) based detection algorithm, with adequately lower complexity. As well, the CLD...
OFDM is one of the most promising techniques for the high speed next generation mobile communication. However, it has a high peak to average power ratio. In this paper, we propose spread spectrum (SS)-OFDM for PAPR reduction. In this method, each subcarrier forms Nyquist pulse the same way to OSSR-OFDM which we proposed in. The results of computer simulation show that our proposal with a large roll-off...
Maintaining data persistence in a scalable fashion for large-scale distributed systems has become critical and essential. It becomes more challenging when nodes have finite energy. In this work, we propose a novel approach called network modulation (NeMo) to significantly improve the data persistence. Built on algebraic number theory, NeMo operates at the level of modulated symbols. Its core notion...
Ultra-wideband wireless communications techniques have many merits, including an extremely simple radio that inherently leads to low-cost design, large processing gain for robust operations in the presence of narrowband interference, covert operations, and fine time resolution for accurate position sensing. However, there are a number of challenges in UWB receiver design, such as capturing multipath...
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