Systems and method for phase multiplexing in assigning frequency channels for a wireless communication network
View Patent ↗The present invention provides for a modulation control device and method that can be implemented economically in existing communication networks or new networks to increase capacity. A modulation control device in accordance with the present invention allows for possibly more than one call to simultaneously utilize the same frequency channel for AMPS systems or the same frequency during the same timeslot for TDMA systems. A modulation control device in accordance with the present invention evaluates the transmission quality of a frequency channel and if acceptable, the modulation control device phase divides the frequency channel. The modulation control device assigns phase adjustment values to a call preferably which remain independent of the information encoding modulation techniques utilized. A call then can be modulated by the assigned phase adjustment value during transmission, and the call may be identified by the assigned phase adjustment value during reception. The present invention further provides a methodology for modulating calls by varying phase to increase capacity in wireless communication networks.
1. A system for increasing the capacity of a wireless communication network, comprising:
a modulation control device that assigns a modulation parameter to a call of a mobile which is using one of a plurality of frequency channels wherein the modulation control device uses at least the modulation parameter to modulate the call and uses the modulation parameter to identify the call, the mobile and the frequency channel.
2. The system in claim 1 , wherein the wireless communication network comprises an advanced mobile phone system (AMPS) network.
3. The system in claim 1 , wherein the modulation parameter assigned to the call is a phase adjustment value and other modulation parameters include timeslot and frequency.
4. The system in claim 3 , wherein the wireless communication network comprises a time division multiple access wireless network.
5. The system in claim 3 , wherein the wireless communications network comprises a time division multiple access personal communications system (PCS) network.
6. The system in claim 3 , wherein the wireless communications network comprises a time division multiple access global system for mobile communications (GSM) network.
7. The system of claim 1 , wherein the modulation control device selects a next available frequency channel based on a frequency channel quality measurement of a threshold detector, and selects a modulation parameter, whereby the call is assigned to the next available frequency channel using the selected modulation parameter.
8. The system of claim 7 , wherein the modulation control device calculates the modulation parameter to assign to the frequency channel.
9. The system of claim 7 , wherein the modulation control device stores a plurality of modulation parameters.
10. The system of claim 7 , wherein the modulation control device selects the modulation parameter that substantially distinguished different calls on a single frequency channel.
11. The system of claim 7 , wherein the modulation control device selects the modulation parameter that provides a unique resultant modulation parameter value for the call on the frequency channel.
12. The system of claim 1 , wherein the modulation control device is coupled to a wireless transceiver that assigns the call to one of a plurality of wireless frequency channels.
13. The system of claim 1 , wherein the modulation parameter is a phase adjustment value.
14. The system of claim 13 , wherein the modulation control device receives the phase adjustment value over the wireless communication network, and provides the phase adjustment value to a transceiver for call retrieval during demodulation and for modulation during transmission.
15. A method for increasing the capacity of a wireless communication network, the method comprising:
assigning a modulation parameter to a call of a mobile which is using one of a plurality of frequency channels of the communication network wherein the modulation parameter identifies the call, the mobile and the frequency channel.
16. The method of claim 15 , further comprising:
communicating the modulation parameter to a mobile unit that is associated with the call; and
associating the modulation parameter with the call so that the modulation parameter can be used for transmitting the call and referenced for receiving the call.
17. The method of claim 15 , further comprising:
measuring a transmission quality of the frequency channels individually; and
evaluating the transmission quality of each frequency channel until a first frequency channel having a suitable transmission quality is identified.
18. The method of claim 17 further comprising the step of associating the modulation parameter with the call so that the modulation parameter can be used for transmitting the call and referenced for receiving the call.
19. The method of claim 17 wherein the evaluating step comprises comparing the transmission quality of the frequency channel to a value until the transmission quality exceeds the value.
20. The method of claim 15 further comprising the step of associating the modulation parameter with the call so that the modulation parameter can be used for transmitting the call and referenced for receiving the call.
21. The method of claim 15 , further comprising:
receiving a modulation parameter that identifies, at least in part, a first call received on a frequency channel; and
demodulating the first call on the frequency channel utilizing the modulation parameter.
22. The method of claim 21 further comprising the step of filtering out noise.
23. The method of claim 15 , further comprising:
receiving a modulation parameter that identifies, at least in part, a first call of a mobile unit within a communications channel of a wireless communication network; and
modulating the call utilizing the modulation parameter value.
24. The method of claim 15 , wherein the modulation parameter is a phase adjustment value.
25. The method of claim 15 , further comprising:
measuring a transmission quality of the frequency channels individually during each of a plurality of timeslots, each the plurality of timeslots are associated with a frequency channel; and
evaluating the transmission quality of each frequency channel during each timeslot until a first frequency channel having a suitable transmission quality is identified.
26. The method of claim 25 wherein the evaluating step comprises comparing the transmission quality of the frequency channel during each timeslot to a value until the transmission quality exceeds the value.