lin91957
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 Posted: Thu 19:15, 07 Apr 2011 Post subject: air jordan high heels When there is channel estima |
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When there is channel estimation error detected MC-CDMA system performance analysis PIC
Verify this idea. 3 Simulation results In order to improve the effectiveness of the method described by Montecarlo simulation,[link widoczny dla zalogowanych], set with 32 sub-carrier, spread spectrum code length equal to the number of subcarriers, the system is the ideal power control. In this paper, MC-CDMA Downlink PIC multi-user detection for simulation. All simulations are set to 18 interfering users. Figure 3 Simulation of a channel estimation j't 'case of error, channel estimation error on system BER, the horizontal axis represents the channel estimate and the exact magnitude of the difference between the value of the percentage relative to the accurate value. Whether or 14dB SNR 18dB, the system BER performance with channel estimation error are increasing decline. 4 shows a wide channel estimation error, no channel estimation error as well as channel estimation error followed by a constant factor (0. when the Reconstruction and Modification of 3 cases,[link widoczny dla zalogowanych], the error rate performance comparison. Can see that there is error of channel estimation error when the worst performance,[link widoczny dla zalogowanych], in the same channel estimation error and with constant factor under the amendment, its best performance, because this method is not only modified the channel estimation error, to some extent also fixes level data prior to estimation error, there is the constant factor was a more suitable choice. Figure 5 Simulation of the signal to noise ratio is 16dB, the percentage of channel estimation error is not the same constant factor (set lamda) the choice of the impact on the BER performance in Figure 3 【∞ error percentage of the bit error rate channel estimation error with the curve of a channel 104 estimation error and fix 0,, the mother 1O without channel estimation error one by one ... one ... one ... one by one ... one ... ... ... one. One by one ... one hundred and eleven kinds of situations children O24681O12141618SNR Figure 4-F Comparison of BER performance of one hundred and eleven 10f ... ... ... ... ... ... ... a '~ a ... ... ... ~ I]. . 10 A:, ljt; transcript A pair of homodyne percentage of t / {10-3, ∥ I one. {}, A,[link widoczny dla zalogowanych], {; 1104k - ... 0 .... 1 ... 0. A 20. ... 0.4-0 ... 3 .... 50.6 ... one o ring. Estimation error percentage of O. Flail t, lamda = O. 8} NG rate system the lowest. Estimation error percentage of O. 5, lamda = 0.4 the lowest error rate the system. That channel estimation error is not the same time, select the appropriate sub-constant will be achieved better performance. 4 Conclusion In this paper simulation of channel estimation error on the MC-CDMA system based on PIC's two EGC single-user detection performance impact, and then made a needle Liu channel estimation error measures for improvement, without increasing the system complexity of the case, the simulation results show that this method is very effective. (This article
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