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.
Fast block matching algorithms (BMAs) play an important role in motion estimation and object tracking. Search speed and distortion performance are determined by search pattern shape and size. A fast motion estimation algorithm, called one point pentagon inner search (OPPEN) is presented for both motion estimation and object tracking. The performance of the OPPEN algorithm is analyzed and quantitatively...
In this paper, a method for constructing low-density parity-check (LDPC) codes of good performance in terms of bit error rate (BER) using a computer search algorithm is presented. First, LDPC codes and encoding along with its Tanner graph representation is described. Then, a detailed description of the proposed construction algorithm is given. A modified shortest-path (MSP) algorithm of lower complexity...
This paper presents proposed WiMAX system with compander for reducing peak-to-average power ratio (PAPR). The compander uses mu-law compression and expansion at the transmitter and receiver, respectively. Moreover, the performance of the proposed system will be compared with conventional system, i.e., a system without compander, and a system that uses clipping technique for reduction. All these systems...
Peak to average power ratio (PAPR) is one of the serious problems in any wireless communication system using multicarrier modulation technique like OFDM, which reduces the efficiency of the transmit high power amplifier. In this paper, we suggest a new scheme based on μ-law compander where the optimum value of μ is calculated. With the newly proposed scheme, the simulation results show that, the PAPR...
In this paper, we deal with the multiple access interference (MAI) suppression problem in turbo coded space-time block coded (STBC) direct sequence code-division multiple-access (DS-CDMA) systems. In the proposed system, we preprocess (decorrelate) the coded bits in the transmitter side instead of using a decorrelating detector in the receiver. Using this method, the base station can perform decorrelation...
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.