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US 10,098,092 B2Granted
Multiple access in wireless telecommunications system for high-mobility applications
AssigneeCohere Technologies, Inc.
InventorsShlomo Rakib, Ron Hadani
Life of this patent
Estimating the term…
Abstract
A wireless telecommunications system that mitigates infrasymbol interference due to Doppler-shift and multipath and enables multiple access in one radio channel. Embodiments of the present invention are particularly advantageous for wireless telecommunications systems that operate in high-mobility environments, including high-speed trains and airplanes.
Claims20
A process comprising:
- transmitting:
- (a) a first command to a first wireless terminal to transmit, into a radio channel during a superframe, a first modulated radio-frequency carrier signal that is modulated with:
- (i) a first waveform φ1(m1,n1) of a first waveform array Φ1 and a first data item, and
- (ii) a second waveform φ2(m2,n2) of a second waveform array Φ2 and a second data item, and
- (b) a second command to a second wireless terminal to transmit, into the radio channel during the superframe, a second modulated radio-frequency carrier signal that is modulated with:
- (i) a third waveform φ1 (m3,n3) of the first waveform array Φ1 and a third data item, and
- (ii) a fourth waveform φ2 (m4,n4) of the second waveform array Φ2 and a fourth data item, and
- wherein:
- (i) the waveform φ1(m1,n1) is partitioned into N1 time slots, and
- (ii) the waveform φ2(m2,n2) is partitioned into N2 time slot, and
- (iii) time slot p1 of the waveform φ1(m1,n1) comprises a basic waveform b1(m1) multiplied by exp[2π(n1−1)(p1−1)i/N1], and
- (iv) time slot p2 of the waveform φ2(m2,n2) comprises a basic waveform b2(m2) multiplied by exp[2π(n2−1)(p2−1)i/N2], and
- (v) time slot p3 of the waveform φ1(m3,n3) comprises a basic waveform b1(m3) multiplied by exp[2π(n3−1)(p3−1)i/N1], and
- (vi) time slot p4 of the waveform φ2(m4,n4) comprises a basic waveform b2(m4) multiplied by exp[2π(n4−1)(p4−1)i/N2], and
- (vii) the waveform φ1(m1,n1) is multiplied by the first data item, and
- (viii) the waveform φ2(m2,n2) is multiplied by the second data item, and
- (ix) the waveform φ1(m3,n3) is multiplied by the third data item, and
- (x) the waveform φ2(m4,n4) is multiplied by the fourth data item, and
- (xi) M1, N1, M2, and N2 are positive integers greater than 1, and
- (xii) m1 and m3 are positive integers in the range m1, m3ϵ{1, . . . , M1}, and
- (xiii) m2 and m4 are positive integers in the range m2, m4ϵ{1, . . . , M2}, and
- (xiv) n1, n3, p1, and p3 are positive integers in the range n1, n3, p1, and p3ϵ{1, . . . , N1}, and
- (xv) n2, n4, p2, and p4 are positive integers in the range n2, n4, p2, and p4ϵ{1, . . . , N2}, and
- (xvi) M1≠M2;
- receiving, from the radio channel during the frame, a third modulated radio-frequency carrier signal via an antenna;
- demodulating the third modulated radio-frequency carrier signal to recover the first data item, the second data item, the third data item, and the fourth data item;
- and
- transmitting the first data item and the second data item in association with the first wireless terminal and the third data item and the fourth data item in association with the second wireless terminal.
25 more elements
A process comprising:
- transmitting:
- (a) a first command to a first wireless terminal to transmit, into a radio channel during a superframe, a first modulated radio-frequency carrier signal that is modulated with:
- (i) a first waveform φ1(m1,n1) of a first waveform array Φ1 and a first data item, and
- (ii) a second waveform φ2(m2,n2) of a second waveform array Φ2 and a second data item, and
- (b) a second command to a second wireless terminal to transmit, into the radio channel during the superframe, a second modulated radio-frequency carrier signal that is modulated with:
- (i) a third waveform φ1(m3,n3) of the first waveform array Φ1 and a third data item, and
- (ii) a fourth waveform φ2(m4,n4) of the second waveform array Φ2 and a fourth data item, and
- wherein:
- (i) the waveform φ1(m1,n1) is partitioned into N1 time slots, and
- (ii) the waveform φ2(m2,n2) is partitioned into N2 time slot, and
- (iii) time slot p1 of the waveform φ1(m1,n1) comprises a basic waveform b1(m1) multiplied by exp[2π(n1−1)(p1−1)i/N1], and
- (iv) time slot p2 of the waveform φ2(m2,n2) comprises a basic waveform b2(m2) multiplied by exp[2π(n2−1)(p2−1)i/N2], and
- (v) time slot p3 of the waveform φ1(m3,n3) comprises a basic waveform b1(m3) multiplied by exp[2π(n3−1)(p3−1)i/N1], and
- (vi) time slot p4 of the waveform φ2(m4,n4) comprises a basic waveform b2(m4) multiplied by exp[2π(n4−1)(p4−1)i/N2], and
- (vii) the waveform φ1(m1,n1) is multiplied by the first data item, and
- (viii) the waveform φ2(m2,n2) is multiplied by the second data item, and
- (ix) the waveform φ1(m3,n3) is multiplied by the third data item, and
- (x) the waveform φ2(m4,n4) is multiplied by the fourth data item, and
- (xi) M1, N1, M2, and N2 are positive integers greater than 1, and
- (xii) m1 and m3 are positive integers in the range m1, m3ϵ{1, . . . , M1}, and
- (xiii) m2 and m4 are positive integers in the range m2, m4ϵ{1, . . . , M2}, and
- (xiv) n1, n3, p1, and p3 are positive integers in the range n1, n3, p1, and p3ϵ{1, . . . , N1}, and
- (xv) n2, n4, p2, and p4 are positive integers in the range n2, n4, p2, and p4ϵ{1, . . . , N2}, and
- (xvi) N1≠N2;
- receiving, from the radio channel during the frame, a third modulated radio-frequency carrier signal via an antenna;
- demodulating the third modulated radio-frequency carrier signal to recover the first data item, the second data item, the third data item, and the fourth data item;
- and
- transmitting the first data item and the second data item in association with the first wireless terminal and the third data item and the fourth data item in association with the second wireless terminal.
25 more elements
Dependencies are inferred from the claim text.