【摘要】 多址干扰消除是提高直接序列扩频码分多址(DS-CDMA)卫星通信系统性能的关键技术之一,传统的多级部分并行干扰消除算法(PPIC)由于存在误差累积的问题,不能取得较低的误码率,不能满足误码率性能要求较高的DS-CDMA卫星通信系统。结合信道编码理论,提出了基于译码纠错反馈的部分并行多址干扰消除算法(DPIC),在干扰重构环节,提出一种改进的比特幅度估计方法,提高了干扰的重构精度。仿真结果表明,DPIC算法和改进的比特幅度估计方法能够较好地提高误码率性能。更多还原

【Abstract】 Multiple access interference cancellation is one of the key technologies to improve the performance of Direct Sequence Spread Spectrum Code Division Multiple Access( DS-CDMA) satellite communication system.Because of error accumulation,traditional multi-level partial parallel interference cancellation algorithm( PPIC) cannot achieve the low bit error rate,which cannot satisfy the DSCDMA satellite communication system with high bit error rate performance. Combined with channel coding theory,a partial parallel multiple access interference cancellation algorithm( DPIC) is proposed based on decoded error correction feedback. In the process of interference reconstruction,an improved bit amplitude estimation method is proposed to improve accuracy of interference reconstruction.Finally,simulation results show that the DPIC algorithm and improved bit amplitude estimation method can be used to improve the bit error rate performance.更多还原