中文摘要：

该文提出了一种在有限反馈条件下多入单出–正交频分复用（MISO-OFDM）系统中基于误码率的波束成形方案。将OFDM符号的所有子载波分成若干簇,从码本中选择能够最小化该簇每个子载波的平均误码率的码字,作为该簇的波束成形向量。此方案既能降低反馈量,又能取得较低误码率。同时,为避免所提方案中探求最优解时的穷尽搜索,还基于簇内不同子载波信道频响之间的相关性提出了一种简化的次优算法。仿真结果表明,在典型参数设置下,所提方案能够以较低计算复杂度取得比其他已有方案更好的误码率性能。

英文摘要：

In this paper, a new transmit beamforming scheme with limited feedback is presented in Multiple-Input Single-Output Orthogonal Frequency Division Multiplexing （MISO-OFDM） systems. By dividing the total subcarriers of an OFDM symbol into a series of clusters, from the codebook a ＂proper＂ one minimizing the average Bit Error Rate （BER） per subcarrier of the considered cluster is chosen as the beamforming vector for this cluster. ＂The scheme can reduce the feedback overhead remarkably while obtain good BER performance. Additionally, a simple sub-optimal algorithm based on the correlation of subcarriers is proposed to avoid exhaustive search in the optimal solution. The simulation results show that the proposed algorithm, with low computational complexity, provides improvement over existing schemes.