Electrical Engineering
      and Computer Sciences

Electrical Engineering and Computer Sciences

COLLEGE OF ENGINEERING

UC Berkeley

Performance analysis of a multi-antenna framework for spectrum reuse

Omar Mohammed Bakr, Mark Christopher Johnson, Ben Wild and Kannan Ramchandran

EECS Department
University of California, Berkeley
Technical Report No. UCB/EECS-2008-101
August 20, 2008

http://www.eecs.berkeley.edu/Pubs/TechRpts/2008/EECS-2008-101.pdf

This paper proposes a new framework for spectrum reuse. Existing architectures have centered on secondary users (cognitive radios) that can reliably sense primary users and opportunistically transmit, without directly interacting with the primary system. We argue that a paradigm in which the primary and secondary systems cooperate can result in reduced interference to primary users and more predictable access for secondary users. Because this architecture gives the primary system full control over spectrum sharing, it could be more favorable in the current economic and political environment. We illustrate a concrete instance of our framework by showing how secondary radios can reuse the entire uplink channel of a cellular network. We also demonstrate a computationally efficient beamforming algorithm, which enables the coexistence of the two systems. The proposed architecture requires only modest changes to the primary infrastructure, and is shown to achieve an interference rejection of up to 20 dB in most practical scenarios.


BibTeX citation:

@techreport{Bakr:EECS-2008-101,
    Author = {Bakr, Omar Mohammed and Johnson, Mark Christopher and Wild, Ben and Ramchandran, Kannan},
    Title = {Performance analysis of a multi-antenna framework for spectrum reuse},
    Institution = {EECS Department, University of California, Berkeley},
    Year = {2008},
    Month = {Aug},
    URL = {http://www.eecs.berkeley.edu/Pubs/TechRpts/2008/EECS-2008-101.html},
    Number = {UCB/EECS-2008-101},
    Abstract = {This paper proposes a new framework for
spectrum reuse. Existing architectures have centered on
secondary users (cognitive radios) that can reliably sense
primary users and opportunistically transmit, without directly
interacting with the primary system. We argue that
a paradigm in which the primary and secondary systems
cooperate can result in reduced interference to primary
users and more predictable access for secondary users.
Because this architecture gives the primary system full
control over spectrum sharing, it could be more favorable
in the current economic and political environment.

We illustrate a concrete instance of our framework by
showing how secondary radios can reuse the entire uplink
channel of a cellular network. We also demonstrate a
computationally efficient beamforming algorithm, which
enables the coexistence of the two systems. The proposed
architecture requires only modest changes to the primary
infrastructure, and is shown to achieve an interference
rejection of up to 20 dB in most practical scenarios.}
}

EndNote citation:

%0 Report
%A Bakr, Omar Mohammed
%A Johnson, Mark Christopher
%A Wild, Ben
%A Ramchandran, Kannan
%T Performance analysis of a multi-antenna framework for spectrum reuse
%I EECS Department, University of California, Berkeley
%D 2008
%8 August 20
%@ UCB/EECS-2008-101
%U http://www.eecs.berkeley.edu/Pubs/TechRpts/2008/EECS-2008-101.html
%F Bakr:EECS-2008-101