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How to calculate the effective channel code rate?
Effective channel code rate is defined as the number of downlink information bits (including CRC bits) divided by the number of physical channel bits on PDSCH Let us take the caseMCS=8; ITBS=8, TBS=808; N_PRB=6 The number of downlink information bits =808+24 (CRC bits) = 832.
Which is the correct formula for code rate?
As you see in the code above, the basic formula for code rate is Code Rate = (Transport Block Size + Size of CRC Bits)/(Total number of REs x Number of Bits per Symbol) The equation itself would look simple, but real calculation is not that simple mainly because it is hard figure out ‘Total number of REs’.
What are the different types of coding rates?
9.15.4 Modulation and Coding Channel Types Channel Types Coding Rate Traffic Channels Uplink Shared Channel (UL-SCH) 1/3 Traffic Channels Downlink Shared Channel (DL-SCH) 1/3 Traffic Channels Paging Channel (PCH) 1/3 Traffic Channels Multicast Channel (MCH) 1/3
Is there any theoretical limit for code rate?
A lower code rate means that more redundency bits are inserted during the channel coding process and a higher code rate means that less redundency bits are insterted. Is there any theoretical limit for Code Rate ?
That is, if the code rate is k/n, for every k bits of useful information, the coder generates a total of n bits of data, of which n-k are redundant. If R is the gross bitrate or data signalling rate (inclusive of redundant error coding), the net bitrate (the useful bit rate exclusive of error-correction codes) is ≤ R•k/n.
How is the bit rate of a channel determined?
Each user computes the optimal allocation of the available bit rate between source and channel layers based on its estimated channel band-width and packet loss probability, and joins the corresponding multicast group.
Simply put, the code rate can be defined as the ratio of the data rate that is allocated for a subframe and the maximum data rate that ideally can be allocated in the subframe. A lower code rate means that more redundency bits are inserted during the channel coding process and a higher code rate means that less redundency bits are insterted.