With the rapid increase of the demand for the Internet of Things (IoT), spectrum resources
have incremental challenges. Nonorthogonal multiple access (NOMA) and spectrum …

With the continuous development of wireless communication technology, the number of
access devices continues to soar, which poses a grate challenge to the already scarce …

In the recent past, efficient cooperative spectrum sensing and usage are playing a vital role
in wireless communication because of the significant progress of mobile devices. There is a …

Many state-of-the-art techniques are leveraged to improve spectral efficiency, of which
cognitive radio and multiple access are the most promising ones. In cognitive radio …

The rapid booming of future smart city applications and Internet of things (IoT) has raised
higher demands on the next‐generation radio access technologies with respect to …

In traditional cognitive radio (CR), secondary user (SU) can only access the idle spectrum
when primary user (PU) is absent, which has to vacate the spectrum when detecting the …

Presently, Non-Orthogonal Multiple Access (NOMA) frequently uses Successive Interference
Cancellation (SIC) with channel estimation to detect the receivers' signal successfully …

Nonorthogonal multiple access (NOMA) with a grant-free access has received a lot of
attention due to its support to massive machine-type communication (mMTC) devices. The …

The Internet of Things (IoT) has attracted significant attentions in the fifth generation mobile
networks and the smart cities. However, considering the large numbers of connectivity …

Sixth generation (6G)-enabled Internet of Things (IoT) needs sufficient spectrum resources
to provide spectrum access for massive IoT's terminals. However, traditional orthogonal …