低轨卫星OFDM系统中基于子载波间隔调整方案的抗频偏技术

ue to the dynamic relative motion of the mobile station and the satellite, the signal is affected by varied frequency offset, resulting in a worse performance, such as a higher bit error rate (BER) in the low earth orbit (LEO) satellite communication system. Considering that a mobile station is usually covered by several LEO satellites., this paper presents a novel scheme on adjusting OFDM subcarrier interval, which would properly make use of multiple link signals to achieve a maximum user capacity. What's more, BER would be controlled at a reasonable threshold value by eliminating the inter carrier interference (ICI). The signal to interference plus noise ratio (SINR) of the received signal is analyzed theoretically, and the formula of BER as well as user capacity is derived out according to the very circumstance. And simulation is presented to demonstrate that the proposed scheme achieves a much larger user capacity by searching for the optimum subcarrier interval.