共查询到17条相似文献,搜索用时 78 毫秒
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分析了参考信号耦合有用信号时,实际自适应干扰对消系统的时域特性。分析表明,参考信号含有用信号导致系统时变,改变系统的最佳权值,使系统的干扰对消效果下降,并对有用信号的接收产生影响。根据实际共平台通信系统的收发耦合特性,从时域角度分析得到系统干扰对消比和有用对消比的计算表达式,并得到干扰对消比和有用对消比随相对时延相位变化的规律。提出一种时延匹配方法,通过匹配参考信号提取点至正交功分器输出与接收天线至合成信号注入点间的时延,可以有效抑制参考信号耦合有用信号导致干扰对消效果下降的问题。仿真结果表明,所提出的时延匹配方法能消除有用信号对干扰对消比的影响,还能提高干扰对消效果。 相似文献
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针对通信设备应用的复杂化和对在复杂电磁环境下工作的设备电磁兼容性提出的更高要求,通过分析对消技术的基本原理,提出了一种模拟电路和数字电路相结合的干扰对消技术,并研制出了基于该技术的干扰对消原理样机.对该样机的单机测试和系统联试结果表明,该对消技术具备点频干扰和噪声干扰的抑制能力,对消收敛时间小于100 ms,对消比大于43 dB,适合在窄带通信中应用并可推广到其他领域.该成果正逐步在实际工程中得到运用. 相似文献
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相关干扰对旁瓣对消系统性能的影响 总被引:1,自引:0,他引:1
分析了相关干扰对旁瓣对消系统性能的影响,推导出了相关干扰下的单辅助通道的旁瓣对消系统的对消比的表达式.分析表明:相关干扰可以使旁瓣对消系统的性能退化,其退化的程度正比于相关干扰的功率和目标信号的功率.最后通过计算机仿真验证了理论分析的正确性. 相似文献
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射频干扰对消技术抗单音干扰性能分析 总被引:1,自引:0,他引:1
传统的抗射频阻塞干扰方法会引起有用信号的畸变,同时仅部分抑制了射频阻塞干扰。为了解决这些抗干扰方式存在的不足,提出了一种解决方案射频干扰对消,给出了射频干扰对消抗阻塞干扰的实现方法,并对其抗单音干扰的性能做了计算仿真。结果表明,采用射频干扰对消技术后,在Eb/N0相同的条件下,干信比在10~30dB范围内,对误码率没有影响。 相似文献
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The interference cancellation performance of actual co-site antenna interference cancellation system (CICS) under amplitude modulation jamming signal was analyzed.The expressions of the steady-state weights and theirs structure characteristics of the interference cancellation system under the AM signal were given.The formulae of the interference cancellation ratio (ICR) for carrier frequency and side frequency were derived.The influence factors and the influence rules of the ICR were analyzed.The steady state weights of the interference cancellation system (ICS) were the weighting of the carrier frequency optimal weights and the edge frequency optimal weights according to the power ratio.The increase of the signal bandwidth will increase the discreteness of the carrier frequency optimal weights and the edge frequency optimal weights and lead to the decrease of the interference cancellation ratio (ICR).The decrease degree of the edge frequency ICR was greater than that of the carrier frequency ICR.To improve ICR by increasing the gain was limited.The relationship between the interference cancellation ratio limit and the equivalent transmission delay was given.The design method of the interference cancellation system to improve the ICR under the AM signal was proposed.Finally,the correctness and validity of the theoretical analysis was verified by simulation. 相似文献
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Aiming at the characteristics of NB-IoT such as low power consumption,low cost and low sampling rate,an NB-IoT delay estimation algorithm based on inter-cell interference cancellation was proposed.To gradually eliminate the interaction between signals in each cell,an inter-cell iterative interference cancellation algorithm was considered.In each iteration,the idea of time-frequency cross-correlation overlapping was introduced on the basis of traditional correlation algorithms to break through the limitations of the sampling rate and further improve the accuracy of time delay estimation.At the same time,a first-arrival-path (FAP) searching algorithm based on noise threshold was used to suppress multipath effects.Through experimental simulation,the results show that the proposed algorithm can significantly improve the time delay estimation accuracy of NB-IoT on the basis of related algorithms. 相似文献
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针对MIMO(多输入多输出)通信系统中传统的基于软干扰消除和MMSE(最少均方误差)滤波器的迭代接收方案对信道相关性较敏感的问题。提出了一种基于混合干扰消除(软干扰消除和硬干扰消除)以及MMSE滤波器的检测算法,并引入一个确信机制来控制错误传播问题。仿真结果表明,新算法相比传统的算法在相关信道环境下有明显的性能增益。定性的计算复杂度分析表明新算法在恰当的系统配置下比传统算法具有更低的计算复杂度。 相似文献
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The digital proportion control is introduced to improve the performance of the analog adaptive interference cancellation system (ICS). For the high frequency parts of the signals after multiplier are not required, the sampling frequency need not satisfy the sampling theorem for high frequency. Because the sampling, calculation and output expend time in digital control, the ideal condition, delay condition and delay-wait condition are taken into account. Through analyzing the system model with three conditions, we gain the stable conditions of the system, the optimization step factors that can make the system converge fastest and the formulas of the interference cancellation ratios (ICRs). One step convergence can be accomplished under ideal condition, whereas the system can not converge in one step under delay condition and delay-wait condition. The calculation results show the convergence speed of delay-wait condition is slower than that of delay condition. The ICR is improved with the increase of the step factor which is in stable bound, but the convergence speed is decreased if the step factor exceeds the optimization step factor. In order to avoid that confine, the method of amending the steady state weight to improve the ICR is proposed. The analyses are in agreement with the computer simulations. 相似文献