Adaptive transceiver for utilizing white space spectrum in mobile application
One embodiment of the present invention provides a transceiver for a wireless mobile device. The transceiver includes a transmitter, a receiver, and a bandwidth-determination mechanism configured to determine a transmission bandwidth for the transmitter and a receiving bandwidth for the receiver.
1. A transceiver for a wireless mobile device, comprising:
a transmitter configured to transmit over a transmission band occupying a first portion of a first white space TV channel, wherein the first portion of the first white space TV channel has a narrower bandwidth than a standard TV channel to enable the transceiver to satisfy a predetermined spectrum mask requirement;
a receiver configured to receive over a receiving band occupying a second portion of a second white space TV channel; and
a bandwidth-determination mechanism configured to determine an optimal downlink-to-uplink bandwidth ratio based on a current power budget of the mobile device to satisfy the predetermined spectrum mask requirement under the current power budget, wherein the downlink-to-uplink bandwidth ratio indicates a ratio of the second portion of the second white space TV channel to the first portion of the first white space TV channel, and wherein while determining the optimal downlink-to-uplink bandwidth ratio, the bandwidth-determination mechanism is further configured to:
determine whether the wireless mobile device is on battery power; and
in response to determining that the mobile device is on battery power, reduce the first portion of the first white space TV channel to a smaller portion.
2. The transceiver of claim 1 , wherein the transmitter includes a tunable modulator.
3. The transceiver of claim 2 , wherein the tunable modulator has a tuning range that ranges from 300 MHz up to 3.6 GHz.
4. The transceiver of claim 1 , wherein the determined optimal downlink-to-uplink bandwidth ratio is greater than 1.
5. The transceiver of claim 1 , wherein the receiver includes multiple receiving modules, each configured to receive RF signals at a different bandwidth.
6. A method for generating a transmitter output for a wireless mobile device, comprising:
determining a power budget of the mobile device, which involves determining whether the wireless mobile device is on battery power;
determining an optimal downlink-to-uplink bandwidth ratio based on the power budget, wherein the downlink-to-uplink bandwidth ratio indicates a bandwidth ratio of a receiving band to a transmission band, wherein the transmitting band occupies a first portion of a first white space TV channel, the receiving band occupies a second portion of the second white space TV channel, and wherein the first portion of the first white space TV channel has a narrower bandwidth than a standard TV channel to enable the transceiver to meet a predetermined spectrum mask requirement;
generating the transmitter output based on the determined optimal downlink-to-uplink bandwidth ratio, thereby enabling the transceiver to meet the predetermined spectrum mask requirement under the current power budget; and
in response to determining that the wireless mobile device is on battery power, reducing the first portion of the first white space TV channel to a smaller portion.
7. The method of claim 6 , wherein generating the transmitter output further involves:
generating a baseband signal; and
modulating the baseband signal.
8. The method of claim 7 , wherein modulating the baseband signal is performed by a tunable modulator.
9. The method of claim 8 , wherein the tunable modulator has a tuning range that ranges from 300 MHz up to 3.6 GHz.
10. The method of claim 6 , wherein the determined optimal downlink-to-uplink bandwidth ratio is greater than 1.