Wireless communication system with transmit diversity designs
An apparatus for enabling a base station to transmit radio frequency signals with a transmit diversity technique comprises a first antenna implemented in the base station; and a second antenna implemented in the base station, and placed apart from the first antenna by a predetermined distance. The first antenna utilizes a first frequency band of a predetermined frequency spectrum for transmitting signals, and the second antenna utilizes a second frequency band of the predetermined frequency spectrum for transmitting signals. The first and second frequency bands do not overlap.
1. An apparatus comprising:
a first antenna;
a second antenna;
a first transceiver coupled to the first antenna; and
a second transceiver coupled to the second antenna, wherein the first and second transceivers are configured to receive as inputs, signals having a frequency spectrum including first and second non-overlapping frequency portions, and wherein the first transceiver is configured to transmit to a destination device only the first frequency portion of the signals using a first frequency band of a predetermined spectrum via the first antenna and wherein the second transceiver is configured to transmit to the destination device only the second frequency portion of the signals using a second frequency band of the predetermined spectrum via the second antenna;
wherein the first and second frequency bands do not overlap.
2. The apparatus of claim 1 , wherein the first frequency band and the second frequency band have the same width.
3. The apparatus of claim 1 , wherein the first frequency band and the second frequency band have unequal widths.
4. The apparatus of claim 1 , wherein the first transceiver and the second transceiver are configured to transmit the first and second frequency portions of the signals in the first and second frequency bands, respectively, such that there is a predetermined frequency interval between the first frequency band and the second frequency band.
5. The apparatus of claim 1 , wherein the first frequency portion comprises a first half of the frequency spectrum and the second frequency portion comprises a second half of the frequency spectrum.
6. The apparatus of claim 1 , wherein the first and second antennas are spaced apart by a predetermined distance that is greater than ten times a wavelength of a signal transmitted by the first antenna or the second antenna.
7. The apparatus of claim 1 , wherein the first antenna and the second antenna are mounted at the same location on an antenna tower and have polarizations that are orthogonal to each other.
8. A system comprising:
a mobile unit; and
a base station configured to receive signals from and transmit signals to the mobile unit, the base station comprising:
a first antenna;
a second antenna;
a first transceiver coupled to the first antenna; and
a second transceiver coupled to the second antenna, wherein the first and second transceivers are configured to receive as inputs, signals having a frequency spectrum including first and second frequency portions, wherein the first frequency portion is in a first half of the frequency spectrum and the second frequency portion is in a second half of the frequency spectrum, and wherein the first transceiver is configured to transmit to a destination device only the first frequency portion of the signals using a first frequency band of a predetermined spectrum via the first antenna and wherein the second transceiver is configured to transmit to the destination device only the second frequency portion of the signals using a second frequency band of the predetermined spectrum via the second antenna;
wherein the first and second frequency bands do not overlap.
9. The system of claim 8 , wherein the first frequency band and the second frequency band have the same width.
10. The system of claim 8 , wherein the first transceiver and the second transceiver are configured to transmit the first and second frequency portions of the signals in the first and second frequency bands, respectively, such that there is a predetermined frequency interval between the first frequency band and the second frequency band.
11. The system of claim 8 , wherein the first frequency portion comprises a first half of the frequency spectrum and the second frequency portion comprises a second half of the frequency spectrum.
12. The system of claim 8 , wherein the first and second antennas are spaced apart by a predetermined distance that is greater than ten times a wavelength of a signal transmitted by the first antenna or the second antenna.
13. The system of claim 8 , wherein the first antenna and the second antenna are mounted at the same location on an antenna tower and have polarizations that are orthogonal to each other.
14. The system of claim 8 wherein the base station comprises a first amplifier configured to amplify signals received from the first transceiver prior to transmission via the first antenna and a second amplifier configured to amplify signals received from the second transceiver prior to transmission via the second antenna.
15. A method comprising:
receiving at first and second transceivers of a wireless communication device input signals having a frequency spectrum including first and second non-overlapping frequency portions;
transmitting to a destination device only the first frequency portion of the signals via a first antenna of the wireless communication device in a first frequency band of a predetermined spectrum; and
transmitting to the destination device only the second frequency portion of the signals via a second antenna of the wireless communication device in a second frequency band of the predetermined spectrum;
wherein the first frequency band and the second frequency band and do not overlap.
16. The method of claim 15 , wherein the first frequency portion comprises a first half of the frequency spectrum and the second frequency portion comprises a second half of the frequency spectrum.
17. The method of claim 15 , wherein the first and second frequency bands have unequal widths.