AR# 33852

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LogiCORE IP 3GPP LTE MIMO Encoder v2.0 - Why does the D1 READY not assert when I select four antennas, Spatial Multiplexing, 16-bit data, 2 codewords, and 2 layers?

Description

Why does the D1 READY not assert when I select four antennas, Spatial Multiplexing, 16-bit data, 2 code words, and 2 layers?

Solution


In the LTE specification v8.7.0, Table 6.3.3.2.1 (Code-word-to-layer mapping for spatial multiplexing) shows different combinations of layer and input code words for Spatial Multiplexing encoding.

For 2-layer operation there are two options (rows 2 and 3 in the table) for the number of input code words to use, 2 or 1.

The core is designed to accept only one input code word for 2-layer operation.

This is why the D1 inputs (and D1 ready signal) are never driven.  

For details of the patch, see (Xilinx Answer 38684).

For the C-Models associated with the patch, see (Xilinx Answer 38964).

For a detailed list of LogiCORE 3GPP LTE MIMO Encoder - Release Notes and Known issues, see (Xilinx Answer 33266).

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AR# 33852
Date 08/20/2014
Status Active
Type General Article
IP
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