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GailBranton8
1114 Hillside Drive
Erath, LA 70533
United States
337-937-1811 https://saankhyalabs.com/sl-300/ *******
SDR Forum defines Software Defined Radio as "a collection of hardware and software technologies that enables reconfigurable systems architecture for wireless networks and user terminals. Software-defined radio (SDR), also called software radio (SR), refers to wireless communication in which the transmitter modulation is generated or defined by a computer. The receiver then also uses a computer to recover the signal intelligence. Unlike hardware-based radio systems, software-defined radio can be recognize to suit a wide range of applications. this is one big advantage of this technology evoking interest from telecom industry.

Traditionally, radio communication systems consists of hardware blocks only these performs some function that cannot be changed during operation, addressing the radio systems composed of hardware blocks, engineers must carefully focus on the function design, i.e., logic block design. Hardware based system ordinarily operate provided the design and the manufacture are appropriate. Advance mobile systems like 3G are expected to have over two millions of logic gate to implement physical layer processing for this each hardware block require complex chip designs.

If we consider multiple communication system or multiple function for a single system, the computationally intensive signal processing algorithms and high data rates associated with these systems necessitate dedicated hardware implementation of some portion of the signal processing chain. But, allocating separate hardware resource for each of functions would increase the silicon area, complicate design validation and compatibility, and also increase the cost. Communication system based on software platform can be dynamically reconfigured. This allows efficient reuse of silicon area and dramatically reduces time to market through software modifications instead of hardware redesigns. So with the SDR technology it is possible to produce a communication system that changes operations depending on the software loaded into it. As a transmitter, it analysis and characterizes the available transmission channel, probes the propagation path, constructs an appropriate channel modulation, guides the transmit beam, selects the appropriate power level and then transmits.

As a receiver, it recognizes the mode of incoming transmission, adaptively nullifies interference, estimates the dynamic properties of the desired signal multipath, coherently combines them, equalizes, decodes and corrects errors to receive the signal with lowest Bit Error Rate(BER). Software-defined radio (SDR) (or software radio) has made a transition from obscurity to commercial usage in less than a decade. SDR has emerged from military research to become a cornerstone of third generation strategies for regional and global communications.

Some of the issues that appeared to be roadblocks to SDR development have been solved somewhat. One of these is the ability to normalize air interfaces across regions of the world. Others arise due to the laws of physics that limit technical progress in power dissipation, clock speeds, dynamic range and linearity. SDR has been described as a cornerstone in the evolution of GSM. In addition, industrial leaders such as Nokia, Toshiba and Motorola have declared their intent to migrate from digital radios to software radios as the technology matures. The SDR Forum is an international, nonprofit organization that includes members from academia, the military, vendors, wireless service providers, and regulatory bodies. It is open to all organizations interested in promoting SDR. Together, the members are addressing critical issues such as software downloading, hardware and software model interfaces, and protocols. In the future, software-defined radio will be the technology of choice in several wireless applications such as GSM and AMPS.

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