Signal detecting method and device for multi-codeword MIMO system

A signal detecting device for a multi-codeword multi-input multi-output (MIMO) system, comprising:

• a signal converting unit, configured to convert a received complex number signal into a real number signal;
• a channel estimating unit, configured to perform channel estimation to obtain a channel matrix;
• a channel matrix correcting unit, configured to correct the channel matrix obtained by the channel estimating unit to obtain an equivalent corrected matrix;
• an equivalent detecting signal generating unit, configured to generate an equivalent detecting signal according to the equivalent corrected matrix obtained by the channel matrix correcting unit and the real number signal generated by the signal converting unit;
• an equivalent detecting signal quantizing unit, configured to quantize the equivalent detecting signal generated by the equivalent detecting signal generating unit to obtain an equivalent quantized detecting signal;
• and
• a signal-transmitted-from-transmitting-end generating unit, configured to generate a signal transmitted from a transmitting end according to the equivalent quantized detecting signal obtained by the equivalent detecting signal quantizing unit;
• wherein the channel matrix correcting unit comprises:
• an equivalent channel matrix generating unit, configured to:
• transform a channel model function Y=HX+n obtained after the received complex number signal is converted into the real number signal, so as to obtain a channel model function Y=H(As+b)+n after transformation,
• wherein A is a 2M×2M diagonal matrix whose diagonal element is diag(A)=[a1, a2, . . . , aM, a1, a2, . . . , aM], and when a signal xm transmitted on an mth antenna of the transmitting end is modulated using a pth modulation manner 2Qp−QAM, am=αp, and
• α
• p
• =
• 6
• 2
• Q
• p
• -
• 1
• ,
• b is a 2M×1 matrix, b=[b1, b2, . . . , bM, b1, b2, . . . bM]T, and when the signal xm transmitted on the mth antenna of the transmitting end is modulated using the pth modulation manner 2Qp−QAM, bm=βq, and
• β
• p
• =
• -
• α
• p
• 2
• ⁢
• (
• 2
• Q
• p
• 2
• -
• 1
• )
• ,
• s is a 2M×1 matrix consisting of integer elements, s=[s1, s2, . . . , sM, s1, s2, . . . , sM]T, and when the signal xm transmitted on the mth antenna of the transmitting end is modulated using the pth modulation manner 2Qp−QAM,
• s
• m
• ∈
• {
• 0
• ,
• 1
• ,
• …
• ⁢
• ,
• 2
• Q
• p
• 2
• -
• 1
• }
• ;
• and
• extract A from the channel model matrix Y=H(As+b)+n obtained after transformation, so as to obtain an equivalent channel matrix H0=HA;
• a transformation matrix generating unit, configured to generate a transformation matrix according to the equivalent channel matrix obtained by the equivalent channel matrix generating unit;
• and
• a correcting unit, configured to correct the equivalent channel matrix generated by the equivalent channel matrix generating unit by using the transformation matrix generated by the transformation matrix generating unit, so as to obtain an equivalent corrected matrix.