Radio signal device and method for synchronisation and data transmission of a radio signal

A radio signal device adapted for transmitting a radio signal, wherein the transmitted radio signal z(k,t) comprises at least a block,

• wherein the block comprises a pilot symbol d, the pilot symbol d comprises a plurality of pilot symbol components di, and a data symbol sk, the data symbol sk comprises a plurality of elements sk,i;
• the radio signal device is adapted to generate the radio signal z(k,t) by:
• a. modulate the plurality of pilot symbol components di by a plurality of spreading code sequences ci(t), which result is then modulated by a plurality of carrier waves si(t) to generate the baseline frequency components bi(t), which are forming a baseline multi-carrier pilot signal b(t),
• b. select a data symbol sk depending on an index k, wherein the index k represents the information to be transmitted by the block,
• c. modulate the baseline multi-carrier pilot signal b(t) with the data symbol sk, such that each baseline frequency component bi(t) is multiplied by the corresponding i-th element sk,j of the data symbol sk generating a plurality of modulated frequency components zi(t), and
• d. transmit the radio signal z(k,t) comprising the block, which is comprising the plurality of pilot symbol components di and the data symbol sk.

A radio signal device adapted for receiving and synchronising a radio signal, wherein a received radio signal r(t) comprises a plurality of signal components ri(t) in at least a block (11), and the block comprises a data symbol sk, the data symbol sk comprises a plurality of elements sk,i depending on an index k;

• the received radio signal r(t) being transmitted from a transmitting radio signal device transmitting a radio signal z(k,t);
• the transmitting radio signal device before transmitting the radio signal z(k,t)
• modulates a plurality of pilot symbol components di by a plurality of spreading code sequences ci(t), which result then being modulated by a plurality of carrier waves si(t) to generate the baseline frequency components bi(t), which are forming a baseline multi-carrier pilot signal b(t), and
• modulates the baseline multi-carrier pilot signal b(t) with the data symbol sk, such that each baseline frequency component bi(t) is multiplied by the corresponding i-th element sk,i of the data symbol sk generating a plurality of modulated frequency components zi(t),
• then the transmitting radio signal device transmits the radio signal z(k,t) comprising the block, which is comprising the plurality of pilot symbol components di and the data symbol sk;
• the radio signal device adapted for receiving the radio signal r(t), after receiving the radio signal r(t), is adapted to determine the index k of the data symbol sk of the received block, by:
• a. demodulate each of the signal components ri(t) with the carrier wave si(t) and the spreading code sequence ci(t) to obtain a Cross-Ambiguity Function (CAF) Yk,i of each signal component,
• b. obtain an overall CAF Ωk by combining the CAFs Yk,i, of each signal component,
• c. detect local maximums above a threshold a (PFA) of the phase lag dimension p of the overall CAF Ωk,
• d. determine the index k of the data symbol sk of the received block based on the detected local maximums and the distance between the local maximums in the phase lag dimension ρ.

A method for transmitting a radio signal for a radio signal device, wherein

• (i) the transmitted radio signal z(k,t) comprises at least a block,
• wherein the block comprises a pilot symbol d, the pilot symbol d comprises a plurality of pilot symbol components di, and a data symbol sk, the data symbol sk comprises a plurality of elements sk,i;
• the radio signal device is adapted to generate the radio signal z(k,t) by:
• a. modulating the plurality of pilot symbol components di by a plurality of spreading code sequences ci(t), which result is then modulated by a plurality of carrier waves si(t) to generate the baseline frequency components bi(t), which are forming a baseline multi-carrier pilot signal b(t),
• b. selecting a data symbol sk depending on an index k, wherein the index k represents the information to be transmitted by the block,
• c. modulating the baseline multi-carrier pilot signal b(t) with the data symbol sk, such that each baseline frequency component bi(t) is multiplied by the corresponding i-th element sk,i of the data symbol sk generating a plurality of modulated frequency components zi(t), and
• d. transmitting the radio signal z(k,t) comprising the block, which is comprising the plurality of pilot symbol components di and the data symbol sk, or
• (ii) a received radio signal r(t) comprises a plurality of signal components ri(t) in at least a block, and the block comprises a data symbol sk, the data symbol sk comprises a plurality of elements sk,i depending on an index k;
• the received radio signal r(t) being transmitted from a transmitting radio signal device transmitting a radio signal z(k,t);
• the transmitting radio signal device, before transmitting the radio signal z(k,t),
• modulates a plurality of pilot symbol components di by a plurality of spreading code sequences ci(t), which result then being modulated by a plurality of carrier waves si(t) to generate the baseline frequency components bi(t), which are forming a baseline multi-carrier pilot signal b(t), and
• modulates the baseline multi-carrier pilot signal b(t) with the data symbol sk, such that each baseline frequency component bi(t) is multiplied by the corresponding i-th element sk,i of the data symbol sk generating a plurality of modulated frequency components zi(t);
• then the transmitting radio signal device transmits the radio signal z(k,t) comprising the block, which is comprising the plurality of pilot symbol components di and the data symbol sk;
• the radio signal device adapted for receiving the radio signal, after receiving the radio signal r(t), is adapted to determine the index k of the data symbol sk of the received block, by:
• e. demodulating each of the signal components ri(t) with the carrier wave si(t) and the spreading code sequence ci(t) to obtain a Cross-Ambiguity Function (CAF) Yk,i of each signal component,
• f. obtaining an overall CAF Ωk by combining the CAFs Yk,i, of each signal component,
• g. detecting local maximums above a threshold, (PFA) of the phase lag dimension p of the overall CAF Ωk,
• determining the index k of the data symbol sk of the received block based on the detected local maximums and the distance between the local maximums in the phase lag dimension ρ.