Bandwidth

Index: Communication Systems 3, Perfect Opamps,Imperfect Opamps,Channel Capacity, Downlink-Uplink

Wireless

Abstract:

This term is misunderstood typically by people as simply BPS (Bits per second), however its contains more factors such as:

• Latency
• Contention Ratio
• Channel Quality, like damaged cables & interference
• System Frequency

Generally Bandwidth is more understood as the range of frequencies allocated towards something like a download or upload.

Signal Power

Signal Power is often expressed in dBm like:

$$dBm=10{\log }_{10}(\frac{P}{1mW})$$

In general people use dBm but there are alternate variants like dBW (where Watts are used) but for communications purposes its typically better to use dBm

Wired

The channel capacity calculation for any cable holds in the same way as it does for wireless systems. So shielding from electrical noise is very important with higher rated cables having more shielding. The bandwidth, B, in our calculation comes from the physical properties of the cable that limit this bandwidth:

$$C=B{\log }_2(1+\frac{S}{N})$$