Error vector magnitude to SNR conversion for nondata-aided receivers (original) (raw)

In this paper, we analyze problems arising from the implementation of the Split-Symbol Moments Estimator (SSME) for symbol signal-to-noise ratio (SNR) estimation currently used for the Block V Receiver (BVR). Through computer simulations, it is shown that the problems arise from a bias in the moments forming the SNR estimate which occur whenever the number of baseband samples per symbol at the receiver is not an even integer. To overcome these problems, the use of a sample-based M2M4 estimator is proposed which is shown to yield satisfactory symbol SNR (SSNR) estimates regardless of the number of samples per symbol. Given the results of the simulations and the performance of the M2M4 estimator, several recommendations are made for addressing the SSNR estimation problems currently present in the BVR.