Patent ID: 9065495
Filing Date: 2015-06-23
Classification: H04B,H04W

Abstract:
1. A two-way relay transmission method applied to multi-input multi-output communication systems, comprising: receiving a first signal transmitted from at least one of two terminals by a relay apparatus, and combining the first signal; and performing a modulo operation to the combined first signal by the relay apparatus to produce a second signal, and broadcasting the second signal, wherein the modulo operation is represented by equation (1): wherein, x wherein, R{ } indicates the real part of the quantity in the braces, ℑ{ } indicates the imaginary part of the quantity in the braces, B is the complex element of the second complex vector variable at the position corresponding to the position of the complex element x where B is greater than or equal to a shift value of a duplicated rotated signal footprint, with the shift value being obtained by rotating a footprint of a signal received at the relay apparatus for a signal transmitted by one of the terminals by an angle θ, duplicating the rotated footprint once, and shifting the duplicated rotated signal footprint such that the distance between any point in the shifted duplicated rotated signal footprint and any point in the original rotated signal footprint is greater than or equal to S and the mod function is a function having a first real variable and a second real variable, with the function taking a symmetric real modulo of the arbitrary first real variable y according to the second real variable, with the symmetric real modulo operation being represented by equation (3): wherein % is an asymmetric real modulo operation mathematically defined as a%b=a−└a/b┘b, where a and b are two arbitrary real numbers, and └a/b┘ means the maximum integer smaller than or equal to a/b.