TDCS大规模分区多址通信方法

针对传统的变换域通信系统多址干扰严重,抑制用户数和误码率性能的问题,提出了一种分区方法降低多址干扰,适用于大规模变换域多址通信。提出多用户的区域划分方法,将用户分为区内用户和干扰较小的区外用户,并推导出误码率计算公式;提出分区向量计算方法,引入CAN算法,提高分区向量的自相关性;从频谱效率和高斯信道下的误码率等角度,分析该方法的总体性能,并给出分区向量最优长度的计算方法。仿真结果表明,该方法能较大程度地扩充用户数,保证误码率在一定范围以内,并且频谱效率较高。 

TDCS Large-scale Partition Multiple Access Communication Method

In view of the serious multi-access interference in traditional transform domain communication systems(TDCS), which can suppress the performance of users and bit error rate, a partition multi-access interference reduction method is proposed, which is suitable for large-scale transform domain multi-access communication. Firstly, an evenly division method is proposed divide users into inner partition users and outer partition users which respectively contributes to performance improvement of spectral efficiency and bit error rate, and the formula of bit error rate is derived. Then, the partition vector calculation method is proposed which introduce CAN algorithm to improve the auto-correlation of the partition vector and further reduce bit error rate. Last, the overall performance of the method is analyzed from the aspects of spectral efficiency and bit error rate under Gaussian channel, and the optimal length of the partition vector is given. Simulation results show that as the number of users increases, this method can ensure the bit error rate within a certain range and the spectrum efficiency stable. Therefore, this method can effectively increase the number of users of TDCS.