CAJ | 학술논문

　　针对多径信道，提出了一种基于序列相关的信噪比估计算法,利用本地序列与接收信号相关，并采用最小二乘估计法，精确地估计了接收信号幅度和噪声方差，得到了两径信道下信噪比的估计值。仿真结果表明该算法整体估计性能较好，特别适合于低信噪比条件下。在信噪比为-1 dB 时，与现有的频域和二阶矩四阶矩（M2M4，2-order and 4-order Moments）估计算法相比,该算法的归一化均方误差分别降低了0.09和0.2。
　　침대다경신도，제출료일충기우서렬상관적신조비고계산법,이용본지서렬여접수신호상관，병채용최소이승고계법，정학지고계료접수신호폭도화조성방차，득도료량경신도하신조비적고계치。방진결과표명해산법정체고계성능교호，특별괄합우저신조비조건하。재신조비위-1 dB 시，여현유적빈역화이계구사계구（M2M4，2-order and 4-order Moments）고계산법상비,해산법적귀일화균방오차분별강저료0.09화0.2。
For the multipath channel, a SNR estimation algorithm based on sequence correlation is proposed. By utilizing the correlation of local sequence and received signal, the signal amplitudes and the noise variance are precisely estimated with Least squares estimation algorithm, and the estimated value of SNR in two-path channel is obtained. Simulation results show that this algorithm, as a whole, performs better than frequency domain and 2-order and 4-order moments (M2M4) estimation algorithms particularly suitable for the condition of low SNR. As the actual SNR is -1dB, the normalized mean square error of the proposed algorithm is reduced by 0.09 and 0.2 respectively.