M-ary modulation for wireless systems
View Patent ↗Disclosed is a method of and apparatus for increasing the capacity of a wireless communication system. This is accomplished by having users that can support a higher than base modulation order be required to do so under predetermined conditions such as electrical distance from a base transceiver station (BTS) antenna to a user, the reception of data in a high speed burst (HSD) and the like. The same digital processor apparatus that may be used to provide a base order modulation scheme may be reprogrammed in a more complex fashion to provide signal processing at the higher modulation rate for any given user channel.
1. A method for increasing throughput in a wireless telecommunication network, comprising the steps of:
using a base modulation order for all users communicating with a given base station;
determining, under predetermined conditions, if given users support communication at a higher modulation order than said base modulation order;
communicating with at least one of said given users the higher modulation order; and
wherein the predetermined conditions comprises one of
(1) a given percentage of total radio capacity and/or code capacity being used;
(2) requiring high-speed data users to operate at a higher modulation order than the base modulation order; and
(3) requiring users closer to a communicating antenna to operate at a higher modulation order than other users physically further from the communicating antenna.
2. A method for increasing throughput in a wireless telecommunication network, comprising the steps of:
determining if a user can support communication at a higher modulation order than a base modulation order; and
communicating with the user at the higher modulation order;
wherein the higher modulation order is performed by one of the step sequences comprising:
a1) n/(n+1) encoding an incoming signal to provide a second signal where n is a positive integer greater than 0;
a2) puncturing by removing 1 of each set of m bits of said second signal to produce a third signal, where m is a positive non-zero integer; and
a3) in phase and quad phase mapping said third signal to provide fourth and fifth signals as outputs or
b1) n/(n+1) encoding an incoming signal to provide a second signal;
b2) repeating the bits of said second signal to produce a third signal;
b3) removing 1 of each set of m bits of said third signal to produce a fourth signal, where m is a positive non-zero integer; and
b4) in phase and quad phase mapping said fourth signal to provide fifth and sixth signals as outputs, or
c1) 1/n encoding an incoming signal to provide a second signal;
c2) removing 1 of each set of m bits of said second signal to produce a third signal, where m is a positive non-zero integer; and
c3) in phase and quad phase mapping said third signal to provide fourth and fifth signals as outputs.
3. The method of claim 2 wherein m=4.
4. A cellular transmitter apparatus in a wireless telecommunication network, comprising:
means to communicate with a first modulation scheme;
means to communicate with a second modulation scheme; and
logic circuitry for selecting between the first and the second modulation schemes;
wherein the means to communicate with a first modulation scheme comprising one of:
a1) a n/(n+1) encoder where n is positive integer greater than 0;
a2) a puncture means for removing bits for an output signal of said a n/(n+1) encoder in accordance with a predetermined function; and
a3) an in phase and quad phase mapping means for mapping signals output by said puncture means, or
b1) a n/(n+1) encoder where n is positive integer greater than 0;
b2) a bit repeating means for duplicating each bit output by said a n/(n+1) encoder;
b3) a puncture means for removing bits for an output signal of said bit repeating means in accordance with a predetermined function; and
b4) an in phase and quad phase mapping apparatus for mapping signals output by said puncture means, or
c1) a 1/n encoder;
c2) a puncture means for removing bits for an output signal of said a 1/n encoder in accordance with a predetermined function; and
c3) an in phase and quad phase mapping means for mapping signals output by said puncture means.
5. A cellular transmitter apparatus in a CDMA network, comprising:
means to communicate with a first modulation scheme;
means to communicate with a second modulation scheme; and
logic circuitry for selecting between the first and the second modulation schemes;
wherein the means to communicate with a first modulation scheme comprising:
where n is a positive integer greater than 0
a n/(n+1) encoder where n is positive integer greater than 0;
a puncture means for removing bits for an output signal of said a n/(n+1) encoder in accordance with a predetermined function;
in phase and quad phase mapping means for mapping signals output by said puncture means;
a symbol repetition means for duplicating the symbols output by said in phase and quad phase mapping means;
a block interleaver means for reordering in phase and quad phase symbols output by said symbol repetition means; and
a combining means for altering the output of said block interleaver means to a given Walsh code.
6. A method for increasing throughput in a CDMA network, comprising the steps of:
using a base modulation order for all users communicating with a given base station;
determining, under predetermined conditions, if given users support communication at a higher modulation order than said base modulation order; and
communicating with at least one of said given users at the higher modulation order;
wherein the higher modulation order is performed by the steps of:
n/(n+1) encoding an incoming signal to provide a second signal where n is a positive integer greater than 0;
puncturing by removing 1 of each set of m bits of said second signal to produce a third signal, where m is a positive non-zero integer; and
in phase and quad phase mapping said third signal to provide fourth and fifth signals as outputs.
7. The method of claim 6 wherein m=4.
8. A method for increasing throughput in a wireless network, comprising the steps of:
establishing a base modulation order for all users communicating with a given base station; and
requiring users electrically closest to said given base station, such users support communication at a higher modulation order than said base modulation order, to use a higher modulation order than other users electrically farther away from said given base station;
wherein the higher modulation order is performed by the steps of:
n/(n+1) encoding an incoming signal to provide a second signal where n is a positive integer greater than 0;
puncturing by removing 1 of each set of m bits of said second signal to produce a third signal, where m is a positive non-zero integer; and
in phase and quad phase mapping said third signal to provide fourth and fifth signals as outputs.
9. The method of claim 8 wherein m=4.
10. A method for increasing throughput in a wireless network, comprising the steps of:
establishing a base modulation order for all users communicating with a given base station; and
requiring users electrically closest to said given base station, such users support communication at a higher modulation order than said base modulation order, to use a higher modulation order than other users electrically farther away from said given base station;
wherein the higher modulation order is performed by the steps of:
n/(n+1) encoding an incoming signal to provide a second signal where n is a positive integer greater than 0;
repeating the bits of said second signal to produce a third signal;
removing 1 of each set of m bits of said third signal to produce a fourth signal, where m is a positive non-zero integer; and
in phase and quad phase mapping said fourth signal to provide fifth and sixth signals as outputs.
11. The method of claim 10 wherein m=4.
12. A method for increasing throughput in a wireless network, comprising the steps of:
establishing a base modulation order for all users communicating with a given base station; and
requiring users wanting to send high speed data to do so at a higher modulation order than said base modulation order;
wherein the higher modulation order is performed by the steps of:
n/(n+1) encoding an incoming signal to provide a second signal where n is a positive integer greater than 0;
repeating the bits of said second signal to produce a third signal;
removing 1 of each set of m bits of said third signal to produce a fourth signal, where m is a positive non-zero integer; and
in and phase mapping said fourth signal to provide fifth and sit signals as outputs.
13. The method of claim 12 wherein m=4.