The current trends in wireless industry like IEEE 802.11a/g/n, IEEE 802.16e are based on OFDM which is highly promising in terms of higher data rates & better immunity to frequency selective fading. However OFDM is limited by high PAPR. High PAPR causes nonlinear distortion in the signal & hence results in intercarrier interference & out-of-band radiation. To combat the effect of high PAPR several PAPR reduction techniques have been devised. All these techniques have to strike a tradeoff among computational complexity, PAPR reduction performance, BER performance & redundancy. PTS technique provides a very effective PAPR reduction with no limit on the maximum number of subcarriers. But the technique suffers from very high computational complexity. Hence authors have tried to modify the technique so that the complexity is reduced significantly without affecting PAPR reduction performance. This dissertation is extensively based on PTS & in this course limns a novel approach which offers better PAPR reduction & significantly reduces the algorithmic complexity with respect to the original technique. The multiple numbers of IFFT blocks has been replaced by a single block; the parallel processing has been replaced by serial processing. The complexities & PAPR reduction performance of the modified & the original techniques have been compared.Furthermore the proposed technique has been emulated in a memory & power constrained environment on C6713DSK with TMS320C6713 processor using real signal input. The emulation results have been analyzed & it has been observed that the emulated PAPR values are at par with simulated ones. To check the SER performance of the technique, the receiver has been simulated as well. The transceiver channel model has been simulated & the SER performance of OFDM system with Single IFFT block PTS has been compared with that of OFDM without any reduction technique. The results show that the PAPR reduction technique does not affect the SER performance.
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机译：无线行业（如IEEE 802.11a / g / n，IEEE 802.16e）的当前趋势基于OFDM，就更高的数据速率和更好的抗频率选择性衰落能力而言，这是很有前途的。但是，OFDM受高PAPR限制。高PAPR会导致信号中的非线性失真，从而导致载波间干扰和带外辐射。为了对抗高PAPR的影响，已经设计了几种降低PAPR的技术。所有这些技术都必须在计算复杂度，降低PAPR的性能，BER性能和冗余之间进行权衡。 PTS技术提供了非常有效的PAPR降低，而子载波的最大数量没有限制。但是该技术具有很高的计算复杂度。因此，作者试图修改该技术，以便在不影响PAPR降低性能的情况下显着降低复杂度。本文广泛地基于PTS，在本课程中提出了一种新颖的方法，该方法可以更好地降低PAPR，并相对于原始技术显着降低算法复杂性。多个IFFT块已被单个块替换；并行处理已由串行处理代替。比较了修改后的技术和原始技术的复杂度和降低PAPR的性能。此外，在具有TMS320C6713处理器的C6713DSK上，使用真实信号输入在C6713DSK的内存和功耗受限的环境中对提出的技术进行了仿真。分析了仿真结果，并且观察到仿真的PAPR值与仿真的PAPR值相同。为了检查该技术的SER性能，还对接收器进行了仿真。已经模拟了收发器信道模型，并且将具有单个IFFT块PTS的OFDM系统的SER性能与没有任何减少技术的OFDM进行了比较。结果表明，PAPR降低技术不会影响SER性能。
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