摘要
为了消除数字接收机同相与正交(I/Q)支路幅度和相位不平衡对数字接收机接收性能的影响,根据时域数据I/Q支路的功率与正交关系,提出了一种I/Q支路不平衡参数估计和补偿方法。该方法的估计和补偿均在时域进行,可以在计算复杂度、估计时间和补偿性能三者之间进行折衷;它无需导频或者训练序列,可应用于多种制式的单载波和多载波接收机中。仿真结果表明:利用该方法的64QAM-OFDM系统误码率在AWGN信道下可以达到理想性能,在多径信道下1×10-3误码率处的性能损失可以减小到0.1 dB左右。
The performance degradation of digital receivers caused by I/Q gain and phase imbalances is improved by a method to estimate and compensate for I/Q imbalances based on the power and orthogonality relationships between the in-phase and quadrature channels of the time domain data. Both of the estimates and the compensation are carried out in the time domain which allows for a flexible tradeoff between computational complexity, estimation time and compensation performance. Because the estimation of the I/Q imbalance does not need any pilots or training sequence, this technique is applicable to a wide range of single-carrier and/or multi-carrier communication and broadcasting systems. Simulations of a 64QAM-OFDM system show that this technique can achieve the optimal bit error rate （BER） performance under AWGN channel, and can reduce the performance degradation to about 0. 1 dB when the BER is 10^-3 under frequency-selective fading channel.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第1期49-52,共4页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金资助项目(50177001)
