Digital antenna switching

摘要

Systems and methods for antenna switching without using a radio-frequency switch are provided. A signal received via a first antenna is digitized to form a first digital received signal. A signal received via a second antenna is digitized to form a second digital received signal. A switch selects the first digital received signal or the second digital received signal to be supplied to a modem to be demodulated. The switch may also supply a digital transmit signal from the modem to be supplied to digital-to-analog converters to and then transmitted using the first or second antenna. Additionally, when the modem is demodulating the signal received via the first antenna, another modem may be demodulating the signal received via the second antenna and vice versa.

主权项

1. A circuit for switching antennas in a wireless terminal, comprising:
a first analog-to-digital converter configured to convert a first analog received signal to a first digital received signal; a second analog-to-digital converter configured to convert a second analog received signal to a second digital received signal; a first modem module configured to demodulate a first input signal and to modulate information to produce a first output signal; a first digital-to-analog converter configured to convert a first digital transmit signal to a first analog transmit signal; a second digital-to-analog converter configured to convert a second digital transmit signal to a second analog transmit signal; and a switch coupling the first analog-to-digital converter and the second analog-to-digital converter to the first modem module, and coupling the first digital-to-analog converter and the second digital-to-analog converter to the first modem module, and configured to select one of the first digital received signal and the second digital received signal and to supply the selected one of the first digital received signal and the second digital received signal to the first modem module as the first input signal in a first state and to supply the second digital received signal to the first modem module as the first input signal in a second state.