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在无线通信中,信噪比作为衡量信道质量的标准,为信道分配提供所需的信道质量信息。针对实时信道分配,提出一种基于解调判决的信噪比估计方法,直接利用解调信号的判决值计算出所叠加的噪声值,以减少信噪比估计的运算时间损耗。最后进行仿真验证,并与已有方法进行性能比较。仿真结果表明,该方法在整体性能没有下降的同时,可以用较少的接收信号序列得到相同的估计精度,具有较好的实时性能。
In wireless communications, the signal-to-noise ratio is used as a measure of channel quality to provide the required channel quality information for channel assignment. Aiming at the real-time channel allocation, a signal-to-noise ratio estimation method based on demodulation decision is proposed. The noise value is calculated by using the decision value of the demodulation signal directly to reduce the computation time loss of SNR estimation. Finally, the simulation verification and performance comparison with the existing methods. Simulation results show that the proposed method can obtain the same estimation accuracy with fewer received signal sequences and has better real-time performance without degrading the overall performance.