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There’s a good read on Anandtech for Icera technology:

http://www.anandtech.com/show/6787/nvidia-tegra-4-architecture-deep-dive-plus-tegra-4i-phoenix-hands-on/7

Not sure it will answer all you questions but it’s an interesting take on basebands

1 day ago on Nvidia's newest Tegra chip is ready for faster LTE-Advanced networks 1 recommend