Coordinated multipoint systems

1. A method of enabling a flexible channel bandwidth for mobile radio communications, comprising:

provisioning a set of Orthogonal Frequency Division Multiplexing (OFDM) subcarriers for mobile radio communications;

encoding data symbols with polyphase codes derived from a discrete Fourier transform to produce encoded data symbols; and

modulating the encoded data symbols onto the OFDM subcarriers to produce a superposition signal that resembles a single-carrier signal and has one of a plurality of different symbol durations;

wherein provisioning comprises selecting one of a plurality of different selectable subcarrier spacings, to provide for the one of the plurality of different symbol durations.

2. The method of claim 1 , wherein at least one of the plurality of different selectable subcarrier spacings equals at least one other of the plurality of different selectable subcarrier spacings multiplied by a scaling factor that is a power of two.

3. The method of claim 1 , wherein the superposition signal is provided with a cyclic prefix.

4. The method of claim 1 , wherein the provisioning comprises receiving at least one of a system requirement and a channel characteristic, and the selecting is responsive to the at least one of the system requirement and the channel characteristic to provide at least one of a predetermined transmission rate, a predetermined bandwidth, a predetermined signal-to-noise ratio, or a predetermined delay-spread tolerance.

5. The method of claim 1 , wherein the provisioning is performed by a user device or a base station.

6. The method of claim 1 , wherein the modulating employs a discrete Fourier transform with a plurality of sampling rates that comprise harmonic frequencies.

7. The method of claim 1 , further comprising determining a delay spread in a mobile radio communication network; and based on the delay spread, the selecting being performed according to a first numerology or a second numerology; wherein the first numerology is a first one of the plurality of different selectable subcarrier spacings, and the second numerology is a second one of the plurality of different selectable subcarrier spacings.

8. An apparatus for providing flexible channel bandwidth in mobile radio communications, comprising:

at least one processor; and

at least one non-transitory computer-readable memory in electronic communication with the at least one processor, and instructions stored in the at least one memory, the instructions executable by the at least one processor for:

provisioning a set of Orthogonal Frequency Division Multiplexing (OFDM) subcarriers for mobile radio communications;

encoding data symbols with polyphase codes derived from a discrete Fourier transform to produce encoded data symbols; and

modulating the encoded data symbols onto the OFDM subcarriers to produce a superposition signal that resembles a single-carrier signal and has one of a plurality of different symbol durations;

wherein provisioning comprises selecting one of a plurality of different selectable subcarrier spacings, to provide for the one of the plurality of different symbol durations.

9. The apparatus of claim 8 , wherein at least one of the plurality of different selectable subcarrier spacings equals at least one other of the plurality of different selectable subcarrier spacings multiplied by a scaling factor that is a power of two.

10. The apparatus of claim 8 , further comprising instructions stored in the at least one non-transitory computer-readable memory, the instructions executable by the at least one processor for adding a cyclic prefix to the superposition signal.

11. The apparatus of claim 8 , wherein the provisioning comprises receiving at least one of a system requirement and a channel characteristic, and the selecting is responsive to the at least one of the system requirement and the channel characteristic to provide at least one of a predetermined transmission rate, a predetermined bandwidth, a predetermined signal-to-noise ratio, or a predetermined delay-spread tolerance.

12. The apparatus of claim 8 , wherein the provisioning is performed in a user device or a base station.

13. The apparatus of claim 8 , wherein the modulating employs a discrete Fourier transform with a plurality of sampling rates that comprise harmonic frequencies.

14. The apparatus of claim 8 , further comprising instructions stored in the at least one non-transitory computer-readable memory, the instructions executable by the at least one processor for determining a delay spread in a mobile radio communication network; and based on the delay spread, the selecting being performed according to a first numerology or a second numerology; wherein the first numerology is a first one of the plurality of different selectable subcarrier spacings, and the second numerology is a second one of the plurality of different selectable subcarrier spacings.

15. A computer program product, comprising a non-transitory computer-readable memory having computer readable program code stored therein, the program code containing instructions executable by one or more processors of a computer system for:

provisioning a set of Orthogonal Frequency Division Multiplexing (OFDM) subcarriers for mobile radio communications;

encoding data symbols with polyphase codes derived from a discrete Fourier transform to produce encoded data symbols; and

modulating the encoded data symbols onto the OFDM subcarriers to produce a superposition signal that resembles a single-carrier signal and has one of a plurality of different symbol durations;

wherein provisioning comprises selecting one of a plurality of different selectable subcarrier spacings, to provide for the one of the plurality of different symbol durations.

16. The computer program product of claim 15 , wherein at least one of the plurality of different selectable subcarrier spacings equals at least one other of the plurality of different selectable subcarrier spacings multiplied by a scaling factor that is a power of two.

17. The computer program product of claim 15 , further comprising instructions stored in the at least one non-transitory computer-readable memory, the instructions executable by the at least one processor for adding a cyclic prefix to the superposition signal.

18. The computer program product of claim 15 , wherein the provisioning comprises receiving at least one of a system requirement and a channel characteristic, and the selecting is responsive to the at least one of the system requirement and the channel characteristic to provide at least one of a predetermined transmission rate, a predetermined bandwidth, a predetermined signal-to-noise ratio, or a predetermined delay-spread tolerance.

19. The computer program product of claim 15 , wherein the provisioning is performed in a user device or a base station.

20. The computer program product of claim 15 , wherein the modulating employs a discrete Fourier transform with a plurality of sampling rates that comprise harmonic frequencies.

21. The computer program product of claim 15 , further comprising instructions stored in the at least one non-transitory computer-readable memory, the instructions executable by the at least one processor for determining a delay spread in a mobile radio communication network; and based on the delay spread, the selecting being performed according to a first numerology or a second numerology; wherein the first numerology is a first one of the plurality of different selectable subcarrier spacings, and the second numerology is a second one of the plurality of different selectable subcarrier spacings.