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Parallel Sub-Channel Transmission for Cognitive Radios with Multiple Antennas

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Abstract

In a cognitive radio network that the transceivers have multiple antennas, the secondary users are in cognizant of the spatial channels toward the primary users. The secondary transmitter adjusts the spatial spectrum of its transmission in order to maximize its own information rate while generating acceptable interference to the primary receivers. This paper investigates the rate maximization problem of parallel sub-channel transmission for cognitive radios. The sub-channels are along the spatial directions of the projected channel matrix that nullifies the dominant directions toward the primary receiver, and the power allocation on these sub-channels follows a multi-level water-filling solution. Simulation and experimental results show that, when the number of dimensions of the projected channel matrix is appropriately chosen, this practical transmission method can reach a maximum information rate that is close to the rate of the computationally expensive optimal transmission.

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Authors and Affiliations

  1. Department of Electrical and Computer Engineering, Baylor University, Waco, TX , 76798, USA

    Liang Dong & Yanqing Liu

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  1. Liang Dong
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  2. Yanqing Liu
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Correspondence to Liang Dong.

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Dong, L., Liu, Y. Parallel Sub-Channel Transmission for Cognitive Radios with Multiple Antennas. Wireless Pers Commun 79, 2069–2087 (2014). https://doi.org/10.1007/s11277-014-1974-x

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  • DOI: https://doi.org/10.1007/s11277-014-1974-x

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