The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The EM iterative algorithm is commonly used in recent years for missing data, which has the character of easy and popular applicability. But the EM algorithm has a weakness that is slow convergence speed. A new acceleration algorithm is proposed which unifys the EM iterative algorithm and the Aitken acceleration method in order to solve the problem. Using the Aitken-EM acceleration algorithm to analysis...
The EM iterative algorithm is commonly used in recent years for missing data, which has the character of easy and popular applicability. But the EM algorithm has a fatal weakness that is slow convergence speed, base on that a new EM acceleration algorithm Quasi-Newton EM is proposed in order to solve this problem. In non-Gaussian noise simulation numerical is carried out, the results show that the...
In this paper, we modify background noise of multi-user detection, by selecting non-Gaussian noise of more harshly conditions such as Laplace noise and Alpha-Stable noise. Under the traditional MMSE algorithm, Comparing the BER of the two noises with Gaussian noise, which can get close to real complex environment and be beneficial to further research.
In this paper, we modify background noise of multi-user detection, by selecting non-Gaussian noise of more harshly conditions such as Laplace noise and Alpha-Stable noise. Under the traditional DEC algorithm, Comparing the BER of the two noises with Gaussian noise, which can get close to real complex environment and be beneficial to further research.
Compared with other multi carrier modulate systems, MIMO-OFDM also adopting this kind of technique, is prone to produce high peak-to-average power ratio (PAPR), which will result in frequency spectrum spread and in-band distortion enormously due to the nonlinearity of the high power amplifier. To this main fault in MIMO-OFDM, many scholars propose some new idea to overcome it. Based on SLM technique,...
Although mobile communication technology in our country has experienced a rapid development, surfing the Internet wirelessly supported by the current technology of GPRS and cdma2000 has come true, mobile communication lags behind in our country and still can not meet the peoplepsilas needs that they need the higher data transmission in many multimedia operations. Therefore, many scholars in our country...
Orthogonal frequency division multiplexing (OFDM) is a method that can combat multi-paths, fully use the frequency band, has high data rate and has a promising future in UWA communication. While longer the transmission range, worse the underwater conditions with multi-paths and Doppler offset, which needs to design the system parameters and take practical methods to improve the system. In this paper,...
ATEM cell is widely used in electromagnetic compatibility (EMC) test. When loaded with equipment under test (EUT), the electric field in ATEM cell will be distorted , and the characteristic impedance changed. In this paper, the field distribution and characteristic impedance in ATEM cell loaded with rectangular metallic EUT is analyzed by a simple method---point matching method. The section of an...
ATEM cell is widely used in electromagnetic compatibility (EMC) test. When loaded with equipment under test (EUT), the electric field in ATEM cell will be distorted , and the characteristic impedance changed. In this paper, the field distribution and characteristic impedance in ATEM cell loaded with rectangular metallic EUT is analyzed by a simple method-point matching method. The section of an asymmetric...
ATEM cell is widely used in electromagnetic compatibility (EMC) test. When loaded with equipment under test (EUT), the electric field in ATEM cell will be distorted , and the characteristic impedance changed. In this paper, the field distribution and characteristic impedance in ATEM cell loaded with rectangular metallic EUT is analyzed by a simple method--point matching method. The section of an asymmetric...
ATEM cell is widely used in electromagnetic compatibility (EMC) test. When loaded with equipment under test (EUT), the electric field in ATEM cell will be distorted , and the characteristic impedance changed. In this paper, the field distribution and characteristic impedance in ATEM cell loaded with thin metallic EUT is analyzed by a simple method - point matching method. The section of an asymmetric...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.