Transmitter and signal transmitting method thereof

摘要

A signal transmitter and receiver are provided. The transmitter includes: a Multiple Input Multiple Output (MIMO) precoder configured to, in response to a first input signal and a second input signal, generate a first transmission signal and a second transmission signal by performing MIMO precoding by pre-phase shifting or pre-phase shifting/hopping the second input signal, and superposition encoding the first input signal and the pre-phase shifted or pre-phase shifted/hopped second input signal; and an Orthogonal Frequency Division Multiplexing (OFDM) modulator configured to OFDM modulate the first transmission signal and the second transmission signal.

主权项

1. A transmitter comprising:
a Multiple Input Multiple Output (MIMO) precoder configured to, in response to a first input signal and a second input signal, generate a first transmission signal and a second transmission signal, by performing MIMO precoding by pre-phase shifting or pre-phase shifting/hopping the second input signal, and superposition encoding the first input signal and the pre-phase shifted or pre-phase shifted/hopped second input signal; and an OFDM modulator configured to OFDM modulate the first transmission signal and the second transmission signal, wherein the MIMO precoder performs the MIMO precoding by using one of following four equations:[x1⁡(k)x2⁡(k)]=[cos⁢⁢ψsin⁢⁢ψsin⁢⁢ψ-cos⁢⁢ψ]⁡[100ⅇj⁢⁢θ]⁡[c1⁡(k)c2⁡(k)], where c1(k) is a kth symbol of the first input signal, c2(k) is a kth symbol of the second input signal, x1(k) is a kth symbol of the first transmission signal, x2(k) is a kth symbol of the second transmission signal, [100ⅇj⁢⁢θ]is a pre-phase shift matrix, [cos⁢⁢ψsin⁢⁢ψsin⁢⁢ψ-cos⁢⁢ψ]is a superposition encoding matrix, θ is a pre-phase shift parameter, and w is a superposition encoding parameter;[x1⁡(k)x2⁡(k)]=[cos⁢⁢ψsin⁢⁢ψsin⁢⁢ψ-cos⁢⁢ψ]⁡[100ⅇj⁢⁢θ⁡(k)]⁡[c1⁡(k)c2⁡(k)], where c1(k) is a kth symbol of the first input signal, c2(k) is a kth symbol of the second input signal, x1(k) is a kth symbol of the first transmission signal, x2(k) is a kth symbol of the second transmission signal, [100ⅇj⁢⁢θ⁡(k)]is a pre-phase shift/hopping matrix, [cos⁢⁢ψsin⁢⁢ψsin⁢⁢ψ-cos⁢⁢ψ]is a superposition encoding matrix, θ(k) is a pre-phase shift/hopping parameter for a kth symbol, and ψ is a superposition encoding parameter;[x1⁡(k)x2⁡(k)]=[cos⁢⁢ψ⁡(k)sin⁢⁢ψ⁡(k)sin⁢⁢ψ⁡(k)-cos⁢⁢ψ⁡(k)]⁡[100ⅇj⁢⁢θ]⁡[c1⁡(k)c2⁡(k)], where c1(k) is a kth symbol of the first input signal, c2(k) is a kth symbol of the second input signal, x1(k) is a kth symbol of the first transmission signal, x2(k) is a kth symbol of the second transmission signal, [100ⅇj⁢⁢θ]is a pre-phase shift matrix, [cos⁢⁢ψ⁡(k)sin⁢⁢ψ⁡(k)sin⁢⁢ψ⁡(k)-cos⁢⁢ψ⁡(k)]is a superposition encoding matrix, θ is a pre-phase shift parameter, and ψ(k) is a superposition encoding parameter for a kth symbol; and[x1⁡(k)x2⁡(k)]=[cos⁢⁢ψ⁡(k)sin⁢⁢ψ⁡(k)sin⁢⁢ψ⁡(k)-cos⁢⁢ψ⁡(k)]⁡[100ⅇj⁢⁢θ⁡(k)]⁡[c1⁡(k)c2⁡(k)], where c1(k) is a kth symbol of the first input signal, c2(k) is a kth symbol of the second input signal, x1(k) is a kth symbol of the first transmission signal, x2(k) is a kth symbol of the second transmission signal, [100ⅇj⁢⁢θ⁡(k)]is a pre-phase shift/hopping matrix, [cos⁢⁢ψ⁡(k)sin⁢⁢ψ⁡(k)sin⁢⁢ψ⁡(k)-cos⁢⁢ψ⁡(k)]is a superposition encoding matrix, θ(k) is a pre-phase shift/hopping parameter for a kth symbol, and ψ(k) is a superposition encoding parameter for a kth symbol.