Software radio has been recognised as the next major leap forward in mobile communications, particularly in the light of the many current existing and proposed world-wide air interface standards. A software radio (also called 'flexible architecture radio') is a transceiver in which, ideally, all aspects of its operation are determined using versatile general purpose hardware whose configuration is under software control. It is also assumed to be broadband in nature, as one of its principal applications is perceived to be in replacing the numerous handsets currently required to serve the different standards. This presents a number of significant challenges in both the flexible RF hardware and high-speed DSP software fields.
There are many issues which must be addressed in determining if a software radio can be implemented and also to what extent it is flexible. One of these is the circulator, which has to be very broadband. Since a diplexer usually is a fixed-frequency component within a radio, its elimination is a key element in multi-band or even multi-standard radio. Related to this are the development of suitable mechanisms to attenuate the adjacent channel emissions caused by the high-power signal for transmission. Goal of this investigation is to test the applicability of an active cancellation of the spurious emissions with an auxiliary transmitter.
Sprache der Kurzfassung:
Englisch
Englische Bezeichnung:
Active Cancellation with Auxiliary Transmitter
Englische Kurzfassung:
Software radio has been recognised as the next major leap forward in mobile communications, particularly in the light of the many current existing and proposed world-wide air interface standards. A software radio (also called 'flexible architecture radio') is a transceiver in which, ideally, all aspects of its operation are determined using versatile general purpose hardware whose configuration is under software control. It is also assumed to be broadband in nature, as one of its principal applications is perceived to be in replacing the numerous handsets currently required to serve the different standards. This presents a number of significant challenges in both the flexible RF hardware and high-speed DSP software fields.
There are many issues which must be addressed in determining if a software radio can be implemented and also to what extent it is flexible. One of these is the circulator, which has to be very broadband. Since a diplexer usually is a fixed-frequency component within a radio, its elimination is a key element in multi-band or even multi-standard radio. Related to this are the development of suitable mechanisms to attenuate the adjacent channel emissions caused by the high-power signal for transmission. Goal of this investigation is to test the applicability of an active cancellation of the spurious emissions with an auxiliary transmitter.