PE1-5.1 Introduction to Software Defined Radio
You can state what SDR is and why it is needed, describe reconfiguration mechanisms and handset and base-station architectures, and explain smart antenna systems with their power and calibration issues.
The case for SDR is economic before it is technical: one hardware platform that software retargets to many standards beats a cabinet of single-purpose radios on cost, upgrade path and global roaming. The architectural consequence is the separation of digital from RF, and everything else in the course follows from pushing that boundary closer to the antenna. Note the honest counterweight the syllabus includes — power consumption and calibration — because flexibility is paid for in watts.
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What software-defined radio is and why it is required
What it means to put the radio in software, and what problem that solves. The answer is about flexibility rather than performance, which is worth getting straight first.
Legacy systems and the benefits of multi-standard terminals
Why a handset that speaks one standard is a commercial problem. It is the argument the whole field rests on.
Economies of scale and global roaming
The economic case: one platform serving many markets, and a phone that works everywhere. These are business reasons and they are the actual drivers of the technology.
Service upgrading; adaptive modulation and coding
Changing what a deployed radio does without touching it, including adapting to conditions. It is the capability that most distinguishes this approach.
Operational and key requirements; reconfiguration mechanisms
What the requirements actually are, and the mechanisms for changing configuration safely. Reconfiguring a live radio is harder than it sounds because it must not interfere.
The handset model
The handset side, where power and cost dominate everything. It is the harder of the two cases and the reason the ideal architecture is not built.
New base-station and network architectures; separation of digital and RF
The infrastructure side, where the constraints are different and the digital and radio parts can be separated physically. That separation is what enables the two items below.
Tower-top mounting and BTS hoteling
Putting the electronics at the antenna, and putting many base stations in one building. Both are consequences of being able to move the signal digitally.
Smart antenna systems and their architectures
Antennas that steer rather than radiate uniformly, and the ways they are built. They interact with the processing load, which the capacity topic returns to.
Power consumption and calibration issues
The two problems that constrain every design here. Calibration matters because a flexible radio has more that can drift.
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