Wireless telecommunications system for high-mobility applications

• US 10,555,281 B2
• Filed: 03/31/2017
• Issued: 02/04/2020
• Est. Priority Date: 03/31/2016
• Status: Active Grant

• Current Assignee: Cohere Technologies Inc
• Original Assignee: Cohere Technologies Inc
• Inventors: Hadani, Ron, Rakib, Shlomo
• Primary Examiner(s): Aghdam, Freshteh N
• Application Number:
  US16/084,820
• Publication Number:
  US 20190075551A1
• Time in Patent Office: 1,040 Days
• CPC Class Codes: H04B 1/0475 with means for limiting noise, interference or distortion H04B1/0483 takes precedence
• CPC Class Codes: H04B 1/62 for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio
• CPC Class Codes: H04B 15/00 Suppression or limitation of noise or interference by means associated with receiver H04B1/10
• CPC Class Codes: H04J 11/003 at the transmitter transmission to multiple receive units in multiple input multiple output [MIMO] H04B7/0452; transmit antenna weighting H04B7/0615
• CPC Class Codes: H04L 1/0018 based on latency requirement
• CPC Class Codes: H04L 23/02 adapted for orthogonal signalling
• CPC Class Codes: H04L 25/03006 Arrangements for removing intersymbol interference
• CPC Class Codes: H04L 25/03834 using pulse shaping
• CPC Class Codes: H04L 27/04 Modulator circuits; Transmitter circuits
• CPC Class Codes: H04L 27/06 Demodulator circuits; Receiver circuits
• CPC Class Codes: H04L 27/2626 Arrangements specific to the transmitter only
• CPC Class Codes: H04L 27/2634 Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
• CPC Class Codes: H04L 27/265 Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators H04L27/26524 takes precedence
• CPC Class Codes: H04L 27/2655 Synchronisation arrangements
• CPC Class Codes: H04L 27/2697 in combination with other modulation techniques
• CPC Class Codes: H04L 5/0014 Three-dimensional division time-code-space division H04B7/0413, H04B7/0697
• CPC Class Codes: H04L 5/0016 Time-frequency-code
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04W 72/04 Wireless resource allocation

Abstract

A wireless telecommunications system that mitigates infrasymbol interference due to Doppler-shift and multipath. Embodiments of the present invention are particularly advantageous for wireless telecommunications systems that operate in high-mobility environments, including high-speed trains and airplanes.

Claims

1. An apparatus for wireless communication, comprising:

a modulator configured to;

receive a data item d(1,1) and a data item d(1,2),

generate a waveform φ

(1,1) and a waveform φ

(1,2) wherein;

(i) the waveform φ

(m,n) is partitioned into N time slots 1, . . . , p, . . . , N,

(ii) time slot p of the waveform φ

(m,n) comprises a basic waveform b(m) multiplied by exp[2π

(n−

1)(p−

1)i/N],

(iii) the waveform φ

(m,n) is multiplied by the data item d(m,n),

(iv) M and N are positive integers greater than 1,

(v) m is a positive integer in a range mϵ

{1, . . . , M}, and

(vi) n and p are positive integers in a range nϵ

{1, . . . , N}, and

modulate a radio-frequency carrier signal with a sum of the waveform φ

(1,1) and the waveform φ

(1,2) to generate a modulated radio-frequency carrier signal; and

an antenna configured to radiate the modulated radio-frequency carrier signal into a radio channel.

2. The apparatus of claim 1, wherein j and k are positive integers in the range mϵ

{1, . . . , M}, and wherein a basic waveform b(j) and a basic waveform b(k) are orthogonal for j≠

k.

3. The apparatus of claim 1, wherein the basic waveform b(m) is waveform m in an M-ary stepped-pulse waveform scheme.

4. The apparatus of claim 1, wherein a bandwidth of the radio channel is B Hz, and a duration of the basic waveform b(m) is M/B seconds.

5. The apparatus of claim 1, wherein a bandwidth of the radio channel is B Hz, and a duration of the waveform φ

(m,n) is M·

N/B seconds.

6. An apparatus for wireless communication, comprising:

a modulator configured to;

receive a data item d(1,1) and a data item d(2,1),

generate a waveform φ

(1,1) and a waveform φ

(2,1) wherein;

(i) the waveform φ

(m,n) is partitioned into N time slots 1, . . . p, N,

(ii) time slot p of the waveform φ

(m,n) comprises a basic waveform b(m) multiplied by exp[2π

(n−

1)(p−

1)i/N],

(iii) the waveform φ

(m,n) is multiplied by the data item d(m,n),

(iv) M and N are positive integers greater than 1,

(v) m is a positive integer in a range mϵ

{1, . . . , M}, and

(vi) n and p are positive integers in a range nϵ

{1, . . . , N}, and

modulate a radio-frequency carrier signal with a sum of the waveform φ

(1,1) and the waveform φ

(2,1) to generate a modulated radio-frequency carrier signal; and

an antenna configured to radiate the modulated radio-frequency carrier signal into a radio channel.

7. The apparatus of claim 6, wherein j and k are positive integers in the range mϵ

{1, . . . , M}, and wherein a basic waveform b(j) and a basic waveform b(k) are orthogonal for j≠

k.

8. The apparatus of claim 6, wherein the basic waveform b(m) is waveform m in an M-ary stepped-pulse waveform scheme.

9. The apparatus of claim 6, wherein a bandwidth of the radio channel is B Hz, and a duration of the basic waveform b(m) is M/B seconds.

10. The apparatus of claim 6, wherein a bandwidth of the radio channel is B Hz, and a duration of the waveform φ

(m,n) is M·

N/B seconds.

11. An apparatus for wireless communication, comprising:

a modulator configured to;

receive a data item d(1,1) and a data item d(2,2);

generate a waveform φ

(1,1) and a waveform φ

(2,2) wherein;

(i) the waveform φ

(m,n) is partitioned into N time slots 1, . . . p, N,

(ii) time slot p of the waveform φ

(m,n) comprises a basic waveform b(m) multiplied by exp[2π

(n−

1)(p−

1}i/N],

(iii) the waveform φ

(m,n) is multiplied by the data item d(m,n),

(iv) M and N are positive integers greater than 1,

(v) m is a positive integer in a range mϵ

{1, . . . , M}, and

(vi) n and p are positive integers in a range nϵ

{1, . . . , N}, and

modulate a radio-frequency carrier signal with a sum of the waveform φ

(1,1) and the waveform φ

(2,2) to generate a modulated radio-frequency carrier signal; and

an antenna configured to radiate the modulated radio-frequency carrier signal into a radio channel.

12. The apparatus of claim 11, wherein j and k are positive integers in the range mϵ

{1, . . . , M }, and wherein a basic waveform b(j) and a basic waveform b(k) are orthogonal for j ≠

k.

13. The apparatus of claim 11, wherein the basic waveform b(m) is waveform m in an M-ary stepped-pulse waveform scheme.

14. The apparatus of claim 11, wherein a bandwidth of the radio channel is B Hz, and a duration of the basic waveform b(m) is M/B seconds.

15. The apparatus of claim 11, wherein a bandwidth of the radio channel is B Hz, and a duration of the waveform φ

(m,n) is M·

N/B seconds.

16. An apparatus for wireless communication, comprising:

a modulator configured to;

receive M·

N data items d(1,1), . . . , d(m,n), . . . , d(M,N);

generate M·

N waveforms φ

(1,1), . . . , φ

(m, n), . . . , φ

(M,N), wherein

(i) the waveform φ

(m,n) is partitioned into N time slots 1, . . . , p, . . . , N,

(ii) time slot p of the waveform φ

(m,n) comprises a basic waveform b(m) multiplied by exp[2π

;

(n−

1)(p−

1)i/N],

(iii) the waveform φ

(m,n) is multiplied by the data item d(m,n),

(iv) M and N are positive integers greater than 1,

(v) m is a positive integer in a range mϵ

{1, . . . , M}, and

(vi) n and p are positive integers in a range nϵ

{1, . . . , N}, and

modulate a radio-frequency carrier signal with a sum of M·

N waveforms φ

(1,1), . . . , φ

(m,n), . . . , φ

(M,N), to generate a modulated radio-frequency carrier signal; and

an antenna configured to transmit the modulated radio-frequency carrier signal into a radio channel.

17. The apparatus of claim 16, wherein j and k are positive integers in the range mϵ

{1, . . . , M}, and wherein a basic waveform b(j) and a basic waveform b(k) are orthogonal for j≠

k.

18. The apparatus of claim 16, wherein the basic waveform b(m) is waveform m in an M-ary stepped-pulse waveform scheme.

19. The apparatus of claim 16, wherein a bandwidth of the radio channel is B Hz, and a duration of the basic waveform b(m) is M/B seconds.

20. The apparatus of claim 16, wherein a bandwidth of the radio channel is B Hz, and a duration of the waveform φ

(m,n) is M·

N/B seconds.