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DUAL CODEBOOKS FOR MIMO BEAMFORMING
by
Bertan Tezcan
A Dissertation Presented to the
FACULTY OF THE GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Ful llment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(Electrical Engineering)
May 2009
Copyright 2009 Bertan Tezcan
Object Description
| Title | Dual codebooks for MIMO beamforming |
| Author | Tezcan, Bertan |
| Author email | bertantezcan@yahoo.com; btezcan@idt.com |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Electrical Engineering |
| School | Viterbi School of Engineering |
| Date defended/completed | 2009-01-12 |
| Date submitted | 2009 |
| Restricted until | Unrestricted |
| Date published | 2009-02-25 |
| Advisor (committee chair) | Chugg, Keith M. |
| Advisor (committee member) |
Weber, Charles Kempe, David |
| Abstract | The open loop multiple-input multiple-output (MIMO) wireless systems do not have any channel state information (CSI) at the transmitter (Tx). The closed loop systems have full CSI at the Tx. The closed loop systems have simpler receivers (Rx), and observe beamforming gain compared to the open loop systems. The open loop systems usually have some type of stream decoupling to limit the complexity of the iterative error correction.; In closed loop systems, beamforming (BF) at the transmitter, and beamcombining (BC) at the receiver are simple spatial diversity techniques that increase the effective signal to noise ratio (SNR) of the system and/or allow for multiple spatial streams of data. The optimal BF-BC systems require estimation of the channel at the receiver and transmission of the optimum beamforming vector back to the transmitter. In related research, authors define a codebook of beamforming vectors, and the receiver sends back the index of the vector that maximizes the SNR. In all of these methods the channel estimation and spatial stream decoupling at the receiver can be quite complex and time consuming.; In this paper, a codebook method that does not require direct channel estimation at the receiver or the transmitter is proposed. The proposed method trades off Rx complexity and performance and is between open and closed loop MIMO BF methods. The method also has a simple stream decoupler than existing open loop methods. There is a beamforming vector codebook at the transmitter and a beamcombining vector codebook at the receiver. The codebook vector selection algorithm is based on maximizing the received signal to interference and noise ratio (SINR) per transmitted stream. Gains compared to the open loop methods are observed with the proposed method. |
| Keyword | MIMO; beamforming; spatial diversity; spatial multiplexing; vector codebooks |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m1984 |
| Rights | Tezcan, Bertan |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | http://www.usc.edu/isd/libraries/services/ask_a_librarian/email/ |
| Filename | etd-Tezcan-2572 |
| Archival file | uscthesesreloadpub_Volume40/etd-Tezcan-2572.pdf |
Description
| Title | Page 1 |
| Full text | DUAL CODEBOOKS FOR MIMO BEAMFORMING by Bertan Tezcan A Dissertation Presented to the FACULTY OF THE GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Ful llment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (Electrical Engineering) May 2009 Copyright 2009 Bertan Tezcan |
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