| Electrical & Electronic Engineering |
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| Peak-power reduction by the lattice-reduction-aided closest point search for MIMO broadcast channels |
| Jian-ping ZHENG, Bao-ming BAI, Xin-mei WANG |
| State Key Laboratory of Integrated Services Networks, Xidian University, Xi’an 710071, China |
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Abstract In this letter, we present a modified vector-perturbation precoding scheme for the multiple-input multiple-output broadcast channel, where a perturbation vector is chosen to take into account both the instantaneous power and the instantaneous peak power of the transmitted signal. This perturbation vector is obtained by using the closest point search, with the aid of the lattice-reduction algorithm. Simulation results show that the proposed scheme yields a tradeoff among power efficiency, peak-to-average power ratio reduction, and complexity.
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Received: 09 March 2008
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