Implementation and Complexity Evaluation of Packet Combining for Multi-Code Transmission over Multi-Antenna Broadband Channel

In this paper, a very low complexity packet combining approach for single user multi-code CDMA transmission over a broadband multiple input multiple output (MIMO) channel is presented. This new approach involves a simple modification to the traditional packet combining algorithms by introducing new variables recursively computed. This modification leads to a computational complexity as well as buffer size insensitive to retransmission number. Two packet combining techniques are introduced. The first technique performs packet combining jointly with turbo equalization, the second one performs the combination jointly with demapping.