Patent ID: 8885748

Claim:
An expansion module applicable to a multiple input and multiple output wireless communication system for simultaneously transmitting or receiving N sub-signals with a first direction of polarization and N sub-signals with a second direction of polarization via N antennas, N being a constant bigger than 1, the expansion module comprising: N first radio frequency front end modules, each of the first radio frequency front end modules being connected to one of the antennas for selectively processing one of the sub-signals with the first direction of polarization, or processing one of the sub-signals with the second direction of polarization; N second radio frequency front end modules, each of the second radio frequency front end modules being connected to one of the antennas for selectively process one of the sub-signals with the first direction of polarization, or processing one of the sub-signals with the second direction of polarization; N power dividing and combining devices, an ith power dividing and combining device being connected to the ith first radio frequency front end module and the (i+1)th second radio frequency front end module, the Nth power dividing and combining device is connected to the Nth first radio frequency front end module and the 1st second radio frequency front end module for allocating or integrating the corresponding sub-signals respectively, and i being a constant between 1 and N; and N switchers, each of the switchers being correspondingly connected to one of the power dividing and combining devices for selectively transmitting or receiving the corresponding sub-signals.