From the course: 4G LTE: Architecture, Protocols, Call Flows, KPIs, Optimization, Performance Analysis

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Peak data rate theoretical vs. practical

Peak data rate theoretical vs. practical

From the course: 4G LTE: Architecture, Protocols, Call Flows, KPIs, Optimization, Performance Analysis

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Peak data rate theoretical vs. practical

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We talked about the calculation for throughput, here let's break down this calculation using a common example. We define our inputs for this scenario. We assume we have 20 MHz as a channel bandwidth, 64 QAM as a modulation, 0.75 as a coding rate and we have 2 x 2 MIMO. Now if we calculate the data speed, in this 20 MHz bandwidth we have 100 resource blocks. Each resource block contains 168 resource elements in 1 Ms. But not all of them are used for user data. There are some control signals and reference channels which create certain overheads. If we assume a 16% of overhead, we are left with 14,112 resource elements purely for data. In this case, this is something we need to further determine how many bits these elements – the resource elements we talked about – can carry. This is where modulation and coding schemes come in. With 64 quam modulation scheme, each resource element can carry 6 bits. We then multiply this value with the coding rate which is 0.75. Meaning 75% of those bits…

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