FBMC-MIMO transmission/reception system with ML detection
AssigneeCommissariat A L'energie Atomique Et Aux Energies Alternatives
InventorJean-Baptiste Dore
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Abstract
A transmitter of an FBMC-MIMO system in which, for each FBMC-OQAM modulator associated with a transmission antenna, the symbols of a block to be transmitted are grouped in pairs, the input symbols in a pair being combined to output first and second combined symbols, the combined symbols being input to the FBMC-OQAM modulator. The invention also relates to a receiver including an FBMC-OQAM demodulator and an ML detector from the observables obtained, for each reception antenna. The used ML detection allows for not being affected by intrinsic interference and obtaining a high degree of diversity without increasing the number of antennas.
Claims10
A transmitter of a Filter Bank Multi-Carrier-Multiple Input Multiple Output (FBMC-MIMO) transmission system comprising:
- a plurality(NT) of transmission antennas;
- and
- a plurality of Filter Bank Multi-Carrier-Offset Quadrature Amplitude Modulation (FBMC-OQAM) modulators equal in number to the plurality of transmission antennas, each FBMC-OQAM modulator comprising an OQAM modulator and a bank of synthesis filters, each FBMC-OQAM modulator transforming a block of input symbols into FBMC symbols to be transmitted on a corresponding transmission antenna,
- wherein, for each FBMC-OQAM modulator, the input symbols of a block are combined in pairs at the input to linear combination circuits, a linear combination circuit receiving two input symbols thus paired to output a pair including a first combined symbol based on the two input symbols and a second combined symbol based on the two input symbols, the linear combination being obtained by means of combination coefficients that are all not null, the combined symbols thus obtained being interleaved in an interleaver before being input to said FBMC-OQAM modulator.
A receiver of a Filter Bank Multi-Carrier-Multiple Input Multiple Output FBMC-MIMO transmission system comprising a plurality (NR) of reception antennas and a same plurality of Filter Bank Multi-Carrier-Offset Quadrature Amplitude Modulation (FBMC-OQAM) demodulators, each FBMC-OQAM demodulator comprising an analysis filter bank followed by an OQAM demodulator, each FBMC-OQAM demodulator being associated with a corresponding reception antenna and, starting from a signal received on this antenna, outputting a plurality of complex symbols (yk,nl, k=0, . . . , M−1) corresponding to different FBMC carriers, M being a number of FBMC carriers, wherein said receiver comprises:
- a plurality M of multiplexers to group symbols at outputs from FBMC-OQAM demodulators by FBMC carrier, the symbols thus grouped at the output being represented in the form of a complex vector (yk=(yk,nl, . . . , yk,nNR)T) with size NR, each complex vector being associated with an FBMC carrier, T being a time interval separating consecutive symbol blocks;
- a deinterleaver to deinterleave the complex vectors thus obtained and to supply them in the form of pairs of complex vectors (yk,yk);
- a plurality M of projection circuits, each projection circuit being associated with the FBMC carrier, k=0, . . . ,M−1, and projecting the complex vector associated with this carrier onto the NT last columns of an orthonormal matrix Qk with size 2NR×2NT obtained by QR decomposition of matrix
- H
- ⋓
- k
- =
- (
- )
- in which Hk is the matrix with size NR×NT representing a MIMO channel for carrier k, each projection circuit outputting a projected real vector ({tilde over (y)}k) with size 2NT, NT being a number of transmission antennas;
- a plurality of maximum likelihood detection circuits, each of these circuits receiving a pair of real vectors thus projected and using them to deduce a pair of transmitted symbols ({circumflex over (x)}k, {circumflex over (x)}k+1), a most probable having been combined using a linear combination during transmission.
Dependencies are inferred from the claim text.