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You searched for subject:(Inverse QR decomposition). Showing records 1 – 2 of 2 total matches.

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NSYSU

1. Lin, Wen-Hsin. Adaptive Third-Order Volterra Satellite Channel Equalizer.

Degree: Master, Electrical Engineering, 2001, NSYSU

Digital satellite communication systems are equipped with nonlinear amplifiers such as travelling wave tube (TWT) amplifiers at or near saturation for better efficiency. The TWT exhibits nonlinear distortion in both amplitude and phase (AM/AM and AM/PM) conversion, respectively. That is, in the digital satellite communication the transmission is disturbed not only by the non-linearity of transmitter amplifier, but also by the inter-symbol interference (ISI) with additive white Gaussian noise. To compensate the non-linearity of the transmitter amplifier and ISI, in this thesis, a new nonlinear compensation scheme consists of the predistorter and adaptive third-order Volterra-based equalizer, with the inverse QRD-RLS (IQRD-RLS) algorithm, which are located before and after the nonlinear channel, is proposed respectively. The third-order Volterra filter (TVF) equalizer based on the IQRD-RLS algorithm achieve superior performance, in terms of convergence rate, steady-state mean-squared error (MSE), and numerically stable. They are highly amenable to parallel implementation using array architectures, such as systolic arrays. The computer simulation results using the M-ary PSK modulation scheme are carried out the signal√Ęs constellation diagrams, the learning curve of the MSE and the bit error rate (BER) are compared with conventional least mean square (LMS), gradient adaptive lattice (GAL) and adaptive LMS with lattice pre-filter algorithms. Advisors/Committee Members: Yang Hsin Hsiung (chair), Chern Shiun Jang (committee member), Hao Min Chung (chair), Ma Gin Ko (chair).

Subjects/Keywords: Satellite Channel Equalizer; QR Decomposition; Inverse QR Decomposition; Channel Equalizer; Volterra Series

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Lin, W. (2001). Adaptive Third-Order Volterra Satellite Channel Equalizer. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0717101-092525

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Lin, Wen-Hsin. “Adaptive Third-Order Volterra Satellite Channel Equalizer.” 2001. Thesis, NSYSU. Accessed July 23, 2019. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0717101-092525.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Lin, Wen-Hsin. “Adaptive Third-Order Volterra Satellite Channel Equalizer.” 2001. Web. 23 Jul 2019.

Vancouver:

Lin W. Adaptive Third-Order Volterra Satellite Channel Equalizer. [Internet] [Thesis]. NSYSU; 2001. [cited 2019 Jul 23]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0717101-092525.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lin W. Adaptive Third-Order Volterra Satellite Channel Equalizer. [Thesis]. NSYSU; 2001. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0717101-092525

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


NSYSU

2. Chang, Chung-Yao. Performance of OFDM-Based Wireless Communication Systems and Its Applications with Antenna Arrays.

Degree: PhD, Electrical Engineering, 2004, NSYSU

To satisfy the growing demands of the mobile and personal broadband communications, recently, many innovative technologies have been devised and extensively used for wireless transmission and reception. In the wireless communication systems, even though the performance would be degraded due to channel characteristics, such as multipath fading and background noise, those impacts can be eliminated dramatically through the utilization of diversity and combining. However, some different kinds of interfering sources, including the significant structure interference due to their operation as multiple access in the cellular communication systems, referred to as the multiple access interference (MAI), and inevitable jammers appeared in the overlapped frequency band for common utility, are still existing and now become the main difficulties to collapse the reception performance and system capacity. To suppress the interferences, some advanced signal processing methods, e.g., smart antenna (SA), multiuser detection, interference cancellation, adaptive optimization, and frequency/ frame synchronization, have been suggested to not only alleviate the effects fundamentally but also enhance the signal quality. Orthogonal frequency division multiplexing (OFDM) is a significant multicarrier (MC) technology, and has been widely employed in some commercial communications, such as digital broadcasting and wireless local area network (WLAN). It is considered to be the one of the most promising techniques to combat multipath fading and MAI for the downlinks transmission of the broadband systems. Moreover, spatial processing exploits the diversity provided by SA or intelligent antenna arrays, in which the adaptive beamformer is utilized, and it is an alternative approach to increase the efficiency of wireless system capacity and performance without allocating additional frequency spectrum. It allows the system to make full use of spatial diversity due to multiple antennas. In this dissertation, the wireless communications based on the OFDM technique and the applications of SA are considered. Also, an adaptive linearly constrained (LC) approach via inverse QR-decomposition (IQRD) recursive least-squares (RLS) algorithm is emphasized. The proposed LC-IQRD-RLS algorithm has the merits, such as numerical stability, fast convergence rate, and implementation efficiency, over the conventional adaptive algorithms. Furthermore, by incorporating with derivative constraint, the narrowband array could improve the robustness against to the wideband and coherent jammers. Here, the iterative quadratic maximum likelihood (IQML) algorithm with norm constraint set is utilized to estimate the jammer subspace. Computer simulations verify that the use of narrowband beamformer with an appropriate algorithm, e.g., LC-IQRD-RLS or IQML, could achieve the desired performance for jammer suppression. Next, their applications to the MC-CDMA system with frequency combining process will be fully addressed. In fact, the frequency diversity is achieved through the… Advisors/Committee Members: Chin-Der Wann (chair), Hsin-Hsyong Yang (chair), Wen-Rong Wu (chair), Gin-Kou Ma (chair), Miin-Jong Hao (chair), Shyh-Neng Lin (chair), Ju-Ya Chen (chair), Shiunn-Jang Chern (committee member).

Subjects/Keywords: OFDM; Adaptive constrained algorithm; Smart antenna; Inverse QR-decomposition; MC-CDMA

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Chang, C. (2004). Performance of OFDM-Based Wireless Communication Systems and Its Applications with Antenna Arrays. (Doctoral Dissertation). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0827104-132259

Chicago Manual of Style (16th Edition):

Chang, Chung-Yao. “Performance of OFDM-Based Wireless Communication Systems and Its Applications with Antenna Arrays.” 2004. Doctoral Dissertation, NSYSU. Accessed July 23, 2019. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0827104-132259.

MLA Handbook (7th Edition):

Chang, Chung-Yao. “Performance of OFDM-Based Wireless Communication Systems and Its Applications with Antenna Arrays.” 2004. Web. 23 Jul 2019.

Vancouver:

Chang C. Performance of OFDM-Based Wireless Communication Systems and Its Applications with Antenna Arrays. [Internet] [Doctoral dissertation]. NSYSU; 2004. [cited 2019 Jul 23]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0827104-132259.

Council of Science Editors:

Chang C. Performance of OFDM-Based Wireless Communication Systems and Its Applications with Antenna Arrays. [Doctoral Dissertation]. NSYSU; 2004. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0827104-132259

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