In this post, we will discuss everything about the cyclic prefix. In order to understand cyclic prefix let’s first revise our concepts about OFDM and signal processing. When a device transmits a signal, it may or may not reach directly to the receiver as it goes over a wire. The receiver receives multiple copies of … More Cyclic Prefix in 4G/5G: What & Why?
Let’s first understand why we need such a module in 5G. Rate matching gets you the exact number of bits after channel encoding that are being transmitted. Let’s assume we have some resources allocated for a particular channel and we also know the information bits to be transmitted on these resources. When we say resources … More Rate-matching in 5G: What & Why?
A common question, most telecom experts are interested in is, the maximum data rate supported. These numbers are unrealistic in real life. Data rate calculations are different in 4G and 5G. In this post, we will calculate and understand the maximum data rate. Let’s start with downlink with a single PRB. Irrespective of bandwidth & … More 5G NR data rate calculation
Cell id or also known as Physical Cell Id (PCI) is an unique identity for a cell. LTE has 504 cell ids where 5G has 1008 cell ids. In this post we will find out the answers to our following questions: How these cell ids are assigned to cells? Can we assign any random cell … More Physical Cell Id planning in 5G
In 4G and 5G bits after channel encoding are scrambled with a pseudo random sequence of bits. The output of the channel encoder can theoretically be same with other interfering signal which may lead to failure of decoding at the receiver end. This scrambling module adds extra randomness to the encoded bits which provides coding … More Scrambling in 5G. What and Why?
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