Digital Radio Receiver System : The Studies
An inquiry about how to implement digital radio broadcasting in Indonesia has been done. The authority on communications and information Affairs, Ministry of Communications and Information, released a Norm for Digital Radio Broadcasting) which states that in order to provide a good experience to people using VHF band II frequencies for listening to radios, a minimum frecuency of 100 kilocycles per second (kcps) is needed.
A research about broadbandcommunication systems has shown that in order to give best performance a communication system should be designed and implemented within the narrow band range. Industrial specific need for narrowband communication is growing and it is difficult to find the same level of quality in traditional analog circuits. This has led to the development ofseveralbroadbandcommunicationsystems which areadvantages over traditional analogue circuits. Some examples of industrial narrow band communication systems are as follows: -Radio frequency identification (RFID), control, Identification, dataparsement, power management -Vehicular bluetooth for electric and heavy truck industry -Industrial Zigbee networks for smart energy customers.
A paper about Industrial Narrow Band Communication Systems in General and its implementation into SDR Concept has been conducted recently. In this study. arush research was conducted on various aspects of this industrially relevant communication system which surprisingly relies a lot on Analog Technology. Though there were a fewannels happening over a very short range ( Amateurradio ), it was the transmission of high-bandwidth channels over long distances (> 10 miles) that had been depended on Analog Technology until quite recently. However, this is starting to change with the rapid growth of digital technology and the emergence of SDRs (Single Ended Radio) as the biggeststay technology in wide area communications today. This essay will look at how Industrial Narrow Band Communication Systems have entered into receivers today, with an overriding focus on applications such as defence and security systems, transport monitoring and agricultural surveillance. As digital technology continues to evolve and become more powerful, it will increasingly be useful for receivers to be able to process digital signals using low-power chips and low-cost 3D manifolds using industrial narrow band technologies that have yet to be fully explored by modulators and controllers within receivers overall design philosophy.
An article about the impact of different estimated radiated emissions limits on the digital radio receiver performance was performed. The study found that when the acceptable radiated emissions limit is Ra for a source within radius r of the receiver, the BEP for the receiver is lower than when Ra is greater than or equal to c. The higher Ra allowed values caused an increase in the BEP value by about 20%.
An analysis about a superheterodyne receiver showed that it is effective in removing interference and providing poor sound quality when using radios.
An inquiry about the design and implementation of a radio receiver for avalanche beacon detection was conducted. This research involved the use of software-defined radios and signal processing abilities to create a functioning Radio Receiver for Avalanche Beacons. This proof of concept was designed to detect avalanche beacons on 457 kHz using this technology.
A journal about the digital radio receiver performance in electromagnetic interference environments was conducted. The study found that undesired emissions from electronic equipment, co-located to a digital radio receiver, can affect receiving performance. It is therefore of great importance that this undesired emission be considered in the early design phase of a system containing electronic equipment.
A study about digital radio receivers disturbed environments has shown that the emission from electronic equipment can cause significant problems. This unwanted radiation is important to take into account when designing a digital radio receiver, as it can affect the performance of the system.
A research about compressed sensing methods applied in radio receivers exposed to noise and interference found a dramatic increase in wireless data trac and a rising number of mobile radio transceivers like Bluetooth, WiFi or LTE. Wireless networks become more robust and deliver data rates many times Higher than rates available a few years ago.
A study about the X-band digitization systems aspects and filters for MeerKAT radio astronomy receiver is currently in progress. The MeerKAT Radio Telescope is a 64 element antenna array under construction inSouth Africa. This array will be used to observe radiation from celestial sources at radio frequencies. Once completed, this radio telescope will be the largest and most powerful radar telescope on the planet Earth.
A research about the feasibility of real-time recursive fingerprint radio map creation algorithm combining Wi-Fi and geomagnetism has been conducted. Fingerprint is a typical indoor positioning algorithm, which measures the strength of wireless signals and creates a radio map. Using this radio map, the position is estimated through comparisons with received signal strength measured in. The study found that the positional accuracy could be improved by using a further condition, namely use of a working distance between transmitter and receiver greater than one meter.
An evaluation about a software radio communication system using an AD9361-based receiver was undertaken in order to find any ADV7363 based software radios which are working properly and without any deficiencies. This study found that there are indeed some ADV7363 based software radios which worked perfectly and were very robust, but their costs were quite high. Nevertheless, it was decided that a further study about the feasibility of such a communication system should be conducted in order to improve the performance of this type of radio.
A study about maximizing sum rate for a cognitive radio network is presented. A full-duplex relay is used to hop between antennas and improve data transmission. The study finds that there is aoptimal sum rate for the network when using a FDR.
A study about the incidence of errors in ultra-wideband impulse radios revealed problems with the reception of these waveforms. The main reason is that in full frequency range, these waveforms present many challenges in transmission.
An article about extreme low frequency radio emissions and magnetic qualities of bats within bat caves has been conducted. These radio emissions occurred at low frequencies, which is whybats show magnetic qualities. The returns from 60 Hz AC power systems are also responsible for the creation of these emissions.
An evaluation about a 115-mW, 0.5- m CMOS GPS Receiver with Wide Dynamic-Range Active Filters has been presented. This receptor is implemented in a 0.5-"m CMOS technology and includes all of the analog signal path, comprising a low noise amplifier, I-Q mixers, onchip active filters. This receiver is great for basic location applications as well as more sophisticated tracking tasks thatrequire high sensitivity and detail.
A study about graphene sheet as a flexible radio frequency (RF) antennas has been started, and the progress of this study is being reported. By using graphene sheet as flexible RF antennas, an improved heat rate, higher frequency transmission and better noise characteristics are being achieved.
A research about the use of software defined radio receivers in passive radar applications has been completed and found to be an effective solution when compared to traditional RF receivers. The system utilizes eight circular eighthsense antennas, a radio frequency frontend hardware, and SDR for transmission and reception. This study found that a passive Radar can advantageously be used to track objects and Militiary communications near the ground.
A study about interference in digital radio receivers has been conducted to stricter emission requirements for digital communication systems. ammounts of interference sources can cause performance degradation on digital communication systems. A through measurement method has been needed to identify these interference sources and connection them with performance degradation. Many regular emission requirements have focused on radiating the interference from specific sources, but new measurement methods are needed to characterize all interference sources. This study was done to stricter emission requirements and to find out more about the effectiveness of this measure.
An article about the field of industrial narrowband communication has been undertaken in recent years, where traditional analog circuits have largely taken control. This shift is largely due to the advances in digital signal processing and its ability to deploy many channels into a small space. Industrial narrowband communication systems are quickly becoming an essential part of todaysindustrial landscape. These systems use bands much narrower than the normal radiofrequency range, which allows for high-fidelity transmissions with low jitter. These systems are perfect for monitoring and controlling sensitive machinery, and can be used in a variety of industries including pharmaceuticals, defense electronics, health care, and manufacturing.