China Mobile, ZTE & Huawei are seeking to lead the 5G/4G future. MIMO work was initially led by U.S. researchers. Stanford's Paulraj won the Marconi Prize for inventing it. Gerry Foschini and Tom Marzetta of Bell Labs did crucial work. Most of the first thousand papers came from the U.S. and Western Europe. Lucent was the world leader in most areas of telecom. The U.S. telcos had massive research centers.
Today, those three remain active and others like Ted Rappaport, Andrea Goldsmith and Robert Heath are prominent at important universities. But the industry has changed. Huawei is now the world's largest telecom company and has committed $600M to 5G research. ZTE is now in the top five. The EU has promised a billion for 5G research, much of which will come to market through Ericsson and Nokia.