Simultaneous Sensing and Transmission for Cognitive Radios With Imperfect Signal Cancellation

• In conventional cognitive radio systems, the secondary user employs a “listen-before-talk” paradigm, where it senses if the primary user is active or idle, before it decides to access the licensed spectrum. However, this method faces challenges, with the most important one being the reduction of the secondary user's throughput, as no data transmission takes place during the sensing period. In this context, the idea of simultaneous spectrum sensing and data transmission is proposed. This paper studies a system model where this concept is obtained through the collaboration of the secondary transmitter with the secondary receiver. First, the secondary receiver decodes the signal from the secondary transmitter, removes it from the total received signal, and then carries out spectrum sensing in the remaining signal in order to determine the presence/absence of the primary user. Different from the existing literature, this paper considers the imperfect signal cancellation, evaluating how the decoding errors affect the sensing reliability, and derives the analytical expressions for the probability of false alarm. Finally, numerical results are presented illustrating the accuracy of the proposed analysis.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik -- Signalbehandling (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering -- Signal Processing (hsv//eng)

Nyckelord

Cognitive radio

decoding

radio spectrum management

signal detection

cognitive radio

data transmission

decoding errors

false alarm probability

imperfect signal cancellation

licensed spectrum

listen-before-talk paradigm

primary user

secondary receiver

secondary transmitter

secondary user

sensing period

sensing reliability

simultaneous spectrum sensing

cognitive radio

data communication

detectors

interference

radio transmitters

receivers

cognitive radio;energy detector

imperfect signal cancellation

simultaneous sensing and transmission

truncated chi-squared distribution

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)