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A blind symbol recovery for dual antenna OFDM systems

机译:双天线OFDM系统的盲符号恢复

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Blind symbol recovery is attractive in OFDM systems because it saves bandwidth that would otherwise be lost to training sequences or pilot tones. Here, a space-frequency implementation of iterative least square constant modulus algorithm (ILS-CMA) on dual antenna OFDM systems is explored and shown to have modest computational complexity compared to the conventional OFDM symbol recovery scheme using channel estimation and frequency domain equalization. It is shown through computer simulations that the symbol error rate (SER) performance of ILS-CMA is close to or even better than the perfect dual antenna combiner for the cases both with or without a cyclic prefix (CP). Also, a fast convergence behavior (less than 10 iterations) is achieved at 20 dB SNR or above with some modest convergence error value.
机译:盲符号恢复在OFDM系统中具有吸引力,因为它可以节省带宽,否则这些带宽将丢失给训练序列或导频音。在此,探索了双天线OFDM系统上的迭代最小二乘恒定模数算法(ILS-CMA)的空频实现,与使用信道估计和频域均衡的传统OFDM符号恢复方案相比,该算法具有适度的计算复杂度。通过计算机仿真显示,对于有或没有循环前缀(CP)的情况,ILS-CMA的符号错误率(SER)性能均接近或什至优于理想的双天线组合器。同样,在20 dB SNR或更高的情况下,以一些适度的收敛误差值即可实现快速收敛行为(少于10次迭代)。

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