Dual carrier index modulation (DC-IM)

A method for wireless reception, the method comprising:

• receiving a transmission signal;
• and
• obtaining, from the received signal, p=p1+p2 bits, wherein p1 and p2 are integers greater than zero, comprising determining, by performing maximum likelihood estimation on the received transmission signal a first subgroup of p1 bits and a second subgroup of p2 bits, wherein:
• the p2 bits are mapped onto R subcarriers respectively by means of R modulation schemes of a sequence of modulation schemes, wherein R is an integer greater than 1;
• and
• the sequence is a sequence of a plurality of predetermined sequences of modulation schemes, wherein:
• the predetermined sequences are mutually different, and
• each of the predetermined sequences has length R and indicates the P1 bits.

A transmitting device, comprising:

• circuitry configured to:
• obtain a plurality of groups of p bits, wherein p is an integer greater than 1;
• generate a transmission signal comprising, for a group of p bits:
• divide the group of p bits into a first subgroup of p1 bits and a second subgroup of p2 bits, wherein p1 and p2 are integers greater than zero;
• select, based on the p1 bits, a sequence of modulation schemes from a plurality of predetermined sequences of modulation schemes, wherein:
• the predetermined sequences are mutually different,
• each of the predetermined sequences has length R, and
• R is an integer greater than 1;
• and
• map the p2 bits onto R subcarriers respectively by means of the R modulation schemes of the selected sequence;
• and
• a transmitter configured to transmit the generated transmission signal.

A receiving device, comprising:

• a receiver configured to receive a transmission signal;
• and
• circuitry configured to:
• obtain, from the received signal, p=p1+p2 bits, wherein p1 and p2 are integers greater than zero, comprising determining, by performing maximum likelihood estimation on the received transmission signal a first subgroup of p1 bits and a second subgroup of p2 bits, wherein:
• the p2 bits are mapped onto R subcarriers respectively by means of R modulation schemes of a sequence of modulation schemes, wherein R is an integer greater than 1;
• and
• the sequence is a sequence of a plurality of predetermined sequences of modulation schemes, wherein:
• the predetermined sequences are mutually different,
• each of the predetermined sequences has length R and indicates the P1 bits.