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为了在被剪波的正交频分复用系统中补偿幅度衰减和缓解剪波噪声,提高系统的误比特性能,提出了一个新的剪波比估计算法.考虑正交频分复用系统中的导频子载波一般是低阶相移键控调制符号,因此这些导频子载波的解调不受幅度衰减影响但是它的误比特率却是剪波比参数的函数.通过推导导频子载波误比特率的闭合表达式,并使用该关系和解一个关于剪波比的方程给出了估计的剪波比.两种评估方法被引入以对估计准确性进行评估.两种评估仿真结果表明,在多径静态衰落信道环境下,即使信噪比很低,提出的算法也优于当前现有的算法.
In order to compensate for amplitude attenuation and mitigation of clipping noise in a system of clipped orthogonal frequency division multiplexing (OFDM) and improve the bit error rate performance of the system, a new algorithm for estimating the ratio of the cutoff is proposed. Considering orthogonal frequency division multiplexing Of pilot subcarriers are generally low order phase shift keying modulation symbols and therefore the demodulation of these pilot subcarriers is not affected by amplitude attenuation but its bit error rate is a function of the shear ratio parameters.By deriving the pilot The closed-form expression for the bit error rate of the carrier wave is given and an estimated shear-wave ratio is given using this relationship and a solution to the shear-wave ratio. Two evaluation methods are introduced to evaluate the estimation accuracy. , In the multi-path static fading channel environment, the proposed algorithm is superior to the current existing one even if the signal-to-noise ratio is very low.