Device communication over television white space
The disclosure described herein configures a multi-narrowband transceiver for communication within the television white space (TVWS) frequency spectrum using a log periodic filter, wherein the log periodic filter comprises a plurality of filter elements each having a filter frequency increasing periodically in a same frequency increasing factor (K). Each filter of the plurality of filter elements is configured to filter out second harmonics in a defined frequency range. The disclosure determines a TVWS channel for the communication and switches to a filter element of the plurality of filter elements corresponding to the determined TVWS channel. Data is transmitted and/or received over the TVWS channel using the filter element, thereby allowing narrowband communication over the TVWS channel.
1. A base station for television white space (TVWS) communication, the base station comprising:
a master transceiver;
a plurality of subordinate transceivers, wherein the master transceiver and the plurality of subordinate transceivers are interconnected, the master transceiver and the plurality of subordinate transceivers configured to transmit and receive at a plurality of TVWS frequencies;
an antenna connected to the master transceiver and the plurality of subordinate transceivers;
a radio frequency (RF) combiner/splitter connected between the antenna and the master transceiver and the plurality of subordinate transceivers; and
a log periodic filter within the master transceiver and the plurality of subordinate transceivers, the log periodic filter comprising a plurality of filter elements each having a filter frequency increasing periodically in a same frequency increasing factor, each filter of the plurality of filter elements configured to filter out second harmonics in a defined frequency range.
2. The base station of claim 1 , wherein the master transceiver is configured to generate a control command to synchronize transmission or reception of the plurality of subordinate transceivers in a same time slot.
3. The base station of claim 2 , wherein the control command comprises one of an analog high signal and an analog low signal, or a digital high signal and a digital low signal.
4. The base station of claim 1 , further comprising a signal generator connected to the RF combiner/splitter and configured to generate a signal and reduce a signal strength of the signal until a minimum detectable signal (MDS) under interference is obtained to identify an available TVWS channel.
5. The base station of claim 1 , further comprising a power amplifier and a low-noise amplifier selectively connected between the RF combiner/splitter and the antenna.
6. The base station of claim 1 , wherein the master transceiver and the plurality of subordinate transceivers are configured to communicate with a plurality of Internet of Things (IoT) devices.
7. The base station of claim 1 , wherein the master transceiver and the plurality of subordinate transceivers are configured to operate using a long range communication protocol.
8. A system for television white space (TVWS) communication, the system comprising:
a master transceiver;
a plurality of subordinate transceivers, wherein the master transceiver and the plurality of subordinate transceivers are interconnected, the master transceiver and the plurality of subordinate transceivers configured to transmit and receive at a plurality of TVWS frequencies;
an antenna connected to the master transceiver and the plurality of subordinate transceivers;
a radio frequency (RF) combiner/splitter connected between the antenna and the master transceiver and the plurality of subordinate transceivers; and
a log periodic filter within the master transceiver and the plurality of subordinate transceivers, the log periodic filter comprising a plurality of filter elements each having a filter frequency increasing periodically in a same frequency increasing factor, each filter of the plurality of filter elements configured to filter out second harmonics in a defined frequency range.
9. The system of claim 8 , wherein the master transceiver is configured to generate a control command to synchronize transmission or reception of the plurality of subordinate transceivers in a same time slot.
10. The system of claim 9 , wherein the control command comprises one of an analog high signal and an analog low signal, or a digital high signal and a digital low signal.
11. The system of claim 8 , further comprising a signal generator connected to the RF combiner/splitter and configured to generate a signal and reduce a signal strength of the signal until a minimum detectable signal (MDS) under interference is obtained to identify an available TVWS channel.
12. The system of claim 8 , further comprising a power amplifier and a low-noise amplifier selectively connected between the RF combiner/splitter and the antenna.
13. The system of claim 8 , wherein the master transceiver and the plurality of subordinate transceivers are configured to communicate with a plurality of Internet of Things (IOT) devices.
14. A computerized method for television white space (TVWS) communication, the computerized method comprising:
configuring a master transceiver to transmit and receive at a plurality of TVWS frequencies using time-division multiple access (TDMA) with synchronization of transmit and receive operations;
configuring a plurality of subordinate transceivers to transmit and receive at the plurality of TVWS frequencies using the TDMA with synchronization of the transmit and receive operations, wherein the master transceiver and the plurality of subordinate transceivers are interconnected, wherein the master transceiver controls when the plurality of subordinate transceivers transmit and receive;
receiving a signal indicating the plurality of subordinate transceivers should operate in at least one of a transmit or receive mode; and
based on the received signal, at least one of transmitting and receiving over the TVWS frequencies using the TDMA to expand communication capabilities over a particular channel.
15. The computerized method of claim 14 , wherein the received signal is a high voltage signal indicating that the plurality of subordinate transceivers should switch to a transmit mode.
16. The computerized method of claim 14 , wherein the received signal is a low voltage signal indicating that the plurality of subordinate transceivers should switch to a receive mode.
17. The computerized method of claim 14 , wherein a general-purpose input/output (GPIO) pin of the master transceiver sends transmit or receive control signals to the plurality of subordinate transceivers.
18. The computerized method of claim 17 , wherein a reset pin is connected to the GPIO pin to control resetting of the master transceiver and the plurality of subordinate transceivers.
19. The computerized method of claim 14 , further comprising:
configuring a signal generator to operate at the plurality of TVWS frequencies with a same modulation scheme as the master transceiver and the plurality of subordinate transceivers, the signal generator transmitting a beacon transmission.
20. The computerized method of claim 19 , further comprising:
detecting the beacon transmission from the signal generator;
detecting interference associated with the beacon transmission;
combining the detected interference with the beacon transmission from the signal generator;
inputting the combined detected interference with the beacon transmission into a port of at least one of the plurality of subordinate transceivers, wherein the at least one subordinate transceiver records a received signal strength indicator (RSSI) and/or signal-to-noise ratio (SNR), and wherein the signal generator reduces a strength of the beacon transmission with iterative transmissions; and
iteratively repeating the detecting, combining, and inputting until the at least one subordinate transceiver is unable to detect the beacon transmission, wherein a lowest RSSI recorded is identified as a minimum detectable signal (MDS) of the at least one subordinate transceiver.