tailieunhanh - Advances in Vehicular Networking Technologies Part 14

Tham khảo tài liệu 'advances in vehicular networking technologies part 14', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 382 Advances in Vehicular Networking Technologies As shown in we make SINRin vary from -10dB to 30dB and SNRout grows slowly with the increase of SINRin. One reason is that the output SNR by ICA algorithm is affected by the mutual information among the source signals and the probability distribution of each signal. For such characteristics are determined the limited change of SINRin plays a little effect in SNRout .When SNRin is equal to 40dB SNRout is around from 18dB to 22dB. But when SNRin is equal to 10dB SNRout is around from 9dB to 14dB. Based on this analysis it can be found that by means of ICA algorithm the higher SNRin is the higher SNRout is. 30 15k 5 Max-SINR ICA SNR in 40dB Fast ICA SNR in 40dB Max-SINR ICA SNR in 10dB Fast ICA SNR in 10dB 101- - I . I r I I I Region 2 performance degradation I I---------I--------I-------I------1 Input signal-to-intererence-noise ratio dB Region 1 performance improvement I 0 -10 -5 0 5 10 15 20 25 30 Fig. 18. SNRout and SINRin fix the length of processing frame On the other side with the same condition such as SNRin is equal the Max-SINR ICA algorithm shows a better performance than the Fast ICA algorithm. Especially SNRout improved by the Max-SINR ICA algorithm is a little more than SNRout improved by the Fast ICA algorithm. However with the increase of SINRin the increase of SNRout is still limited whose growth rate is slower than SINRin . As a result when increases into some value it reaches to balance SNRout SINRrr. . Moreover this state is shown as the slash through the origin in which divides the graph into two regions Region 1 and Region 2. In Region 1 SNRout SINRin which means that the interference mitigation by ICA algorithm is effective. But in Region 2 SNRout SINRrr. which means that the interference mitigation by ICA algorithm is not only ineffective but also degrades the performance worse as the growth of SINRin. Compared with the Fast ICA algorithm the Max-SINR ICA algorithm raises .