Innovative use of the kalman filter in reception matrices for perfoming an improved estimation of telecommunication signals
A radio communications method includes carrying out, by a transmitter, transmission operations that include generating digital transmission signals carrying symbols to be transmitted and having a predefined time length; and transmitting a radio frequency signal carrying, in successive, non-overlapped time frames or slots having the predefined time length, the digital transmission signals generated. The method further includes carrying out, by a receiver, reception operations that include receiving the radio frequency signal transmitted by the transmitter; processing the received radio frequency signal to obtain a corresponding digital incoming signal; applying an oversampling operation to the digital incoming signal thereby obtaining an oversampled digital incoming signal; detecting successive, non-overlapped time frames/slots with the predefined time length in the oversampled digital incoming signal; and, for each detected time frame/slot, estimating respective symbols carried by the oversampled digital incoming signal in the time frame/slot with a predefined reception matrix incorporating a predefined Kalman filter.
1. A radio communications method including carrying out, by a transmitter, transmission operations that comprise:
generating digital transmission signals carrying symbols to be transmitted and having a predefined time length; and
transmitting a radio frequency signal carrying, in successive, non-overlapped time frames or slots having the predefined time length, the digital transmission signals generated;
the radio communications method further including carrying out, by a receiver, reception operations that comprise:
receiving the radio frequency signal transmitted by the transmitter;
processing the received radio frequency signal so as to obtain a corresponding digital incoming signal;
applying an oversampling operation to the digital incoming signal thereby obtaining an oversampled digital incoming signal;
detecting successive, non-overlapped time frames/slots with the predefined time length in the oversampled digital incoming signal; and,
for each detected time frame/slot, estimating respective symbols carried by the oversampled digital incoming signal in said time frame/slot by using a predefined reception matrix, wherein the predefined reception matrix incorporates a static and non-iterative Kalman filter based on predefined or estimated noise levels related to radio communication carried out by the transmitter and the receiver.
2. The radio communications method of claim 1 , wherein the digital transmission signals are generated by using one of the following digital transmission techniques: a predefined raised-cosine-filter-based technique, a predefined code-division technique, or a predefined frequency-division technique.
3. The radio communications method of claim 2 , wherein the radio frequency signal is transmitted through a satellite transponder.
4. The radio communications method according to claim 1 , wherein the generated digital transmission signals carry:
first symbols via a first phase, or amplitude and phase, digital modulation related to an Orbital Angular Momentum mode with topological charge equal to zero; and
second symbols via a second phase, or amplitude and phase, digital modulation related to one or more Orbital Angular Momentum modes with topological charge different than zero.
5. The radio communications method of claim 4 , wherein the first and second phase, or amplitude and phase, digital modulations are performed in time or frequency domain.
6. A radio communications system comprising a transmitter and a receiver configured to carry out, respectively, the transmission and the reception operations of the radio communications method as defined in claim 1 .
7. A transmitting and receiving equipment configured to carry out the transmission operations and the reception operations of the radio communications method as defined in claim 1 .
8. A transmitting equipment configured to carry out the transmission operations of the radio communications method as defined in claim 1 .
9. A receiving equipment configured to carry out the reception operations of the radio communications method as defined in claim 1 .
10. A radio communications method including carrying out, by a transmitter, transmission operations that comprise:
generating digital transmission signals carrying symbols to be transmitted and having a predefined time length, wherein the generated digital transmission signals carry:
first symbols via a first phase, or amplitude and phase, digital modulation related to an Orbital Angular Momentum mode with topological charge equal to zero; and
second symbols via a second phase, or amplitude and phase, digital modulation related to one or more Orbital Angular Momentum modes with topological charge different than zero; and
transmitting a radio frequency signal carrying, in successive, non-overlapped time frames or slots having the predefined time length, the digital transmission signals generated;
the radio communications method further including carrying out, by a receiver, reception operations that comprise:
receiving the radio frequency signal transmitted by the transmitter;
processing the received radio frequency signal so as to obtain a corresponding digital incoming signal;
applying an oversampling operation to the digital incoming signal thereby obtaining an oversampled digital incoming signal;
detecting successive, non-overlapped time frames/slots with the predefined time length in the oversampled digital incoming signal; and,
for each detected time frame/slot, estimating respective symbols carried by the oversampled digital incoming signal in said time frame/slot by using a predefined reception matrix incorporating a predefined Kalman filter.