TITLE:
Universal Band Pass Sampling Algorithm for Integration of Multiple Wireless Technologies Using Software Defined Radio Platform
AUTHORS:
Sriramachandra Murthy Budaraju, Bhagyaveni Marcharla Anjaneyulu
KEYWORDS:
Band Pass Filter, Radio Frequency, Reconfigurable Architecture, Sampling, Software Defined Radio, Wireless Communication
JOURNAL NAME:
Circuits and Systems,
Vol.7 No.4,
April
29,
2016
ABSTRACT: Software Defined Radio (SDR)
architecture allows us to integrate different mobile technologies using common
hardware but with different software modules. To achieve this, we need to keep
the signal in digital form for as much portion of the circuitry as possible, so
that the implementation could be carried out by programmable digital
processors. For this purpose, the incoming radio frequency (RF) signal is down
converted to baseband spectrum using band pass sampling method. Research works
carried out so far in this field have developed a few algorithms for band pass
sampling. But, these algorithms are not much useful for most of the mobile
communication systems and they use complex methodology for computing the
sampling frequency values. In order to use the SDR platform to integrate all
current wireless technologies, an efficient, cost effective and less complex
algorithm that can be labelled as universal band pass sampling algorithm is
developed in this paper for multiple mobile systems. This algorithm is based on
a novel idea of inserting guard bands between the signals which reduces the
design complexities of perfect ADC and sharp cut off filters. Using this
algorithm, valid sampling frequency ranges and corresponding IF values are
calculated for down converting RF signals. The algorithm is tested for six RF
signals of different wireless technologies which are integrated and simultaneously
down converted using SDR based front end receiver and thus the system
multiplies the base station capacity by a factor of six.The simulation
results are obtained and shown in this paper which proves that the algorithm
developed works well for most of the wireless technologies.