Paper Info
Title
Dynamic Pilot Channel Transmission With Adaptive Receive Filter Configuration For Cognitive Radio System
Abstract
When a cognitive radio system dynamically utilizes a frequency band, channel control information must be communicated over the network in order for the currently available carrier frequencies to be shared. In order to keep efficient spectrum utilization, this control information should also be dynamically transmitted through channels such as cognitive pilot channels based on the channel conditions. If transmitters dynamically select carrier frequencies, receivers must receive the control signal without knowledge of its carrier frequencies. A novel scheme called differential code parallel transmission (DCPT) enables receivers to receive low-rate information without any knowledge of the carrier frequency. The transmitter simultaneously transmits two signals whose carrier frequencies are separated by a predefined value. The absolute values of the carrier frequencies can be varied. When the receiver receives the DCPT signal, it multiplies the signal by a frequency-shifted version of itself; this yields a DC component that represents the data signal, which is then demodulated. However, the multiplication process results in the noise power being squared, necessitating high received signal power. In this paper, to realize a bandpass filter that passes only DCPT signals of unknown frequency and that suppresses noise and interference at other frequencies, a DCPT-adaptive bandpass filter (ABF) that employs an adaptive equalizer is proposed. In the training phase, the received signal is the filter input and the frequency-shifted signal is the training input. Then, the filter is trained to pass the higher-frequency signal of the two DCPT signals. The performance of DCPT-ABF is evaluated through computer simulations. We find that DCPT-ABF operates successfully even under strong interference.
Year
DOI
Venue
2012
10.1587/transcom.E95.B.1256
IEICE TRANSACTIONS ON COMMUNICATIONS
Keywords
Field
DocType
cognitive pilot signal, differential code parallel transmission, adaptive equalizer
Transmitter,Telecommunications,Band-pass filter,Frequency band,Computer science,Computer network,Filter (signal processing),Communication channel,Electronic engineering,Adaptive equalizer,DC bias,Cognitive radio
Journal
Volume
Issue
ISSN
E95B
4
0916-8516
Citations 
PageRank 
References 
0
0.34
7
Authors
3
Name
Order
Citations
PageRank
Ren Sakata162.74
Tazuko Tomioka2112.93
Takahiro Kobayashi300.34