Patent ID: 8879660
Filing Date: 2014-11-04
Classification: H04B,H04L

Abstract:
1. An antipodal demodulation method for non-coherent unitary space-time modulation in MIMO wireless communication, comprising steps of: (1) dividing an antipode-based unitary space-time constellation into two sub-constellations and and where L represents the number of constellation points in said constellation, Φ l and Φ l represents two T×M complex matrices, T represents a coherent time interval, M represents the number of transmission antennas, Φ αβ and Φ αβ represents signals transmitted by the β th transmission antenna at time α, there is no antipode pair in the sub-constellation, and there is one-to-one correspondence between two antipodes in different sub-constellations; (2) obtaining traces of a matrix product of L/2 constellation matrices in said sub-constellation C according to said maximum trace ψ max and said minimum trace ψ min , obtaining an antipode matrix Φ j antipodal to Φ j in another sub-constellation according to relationship between said antipodes, calculating a maximum trace ψ max of a matrix product corresponding to the other sub-constellation according to a relationship among said constellation matrices Φ j and Φ j antipodal to each other, and said receiving signal matrix Y: ψ max =σ−ψ min =tr(Y H Φ j Φ j H Y)=tr(Y H Y)−tr(Y H Φ j Φ j H Y), where said receiving signal matrix Y represents a T×N complex matrix, T represents a coherent time interval, N represents the number of receiving antennas, y αγ represents a signal received by the γ th receiving antenna at said time α, and tr(□) represents obtaining a trace of a matrix within the brackets; and (3) comparing said maximum trace ψ as a demodulated constellation matrix {circumflex over (ψ)}=Φ i as ψ max > ψ max , and selecting said transmission signal matrix Φ j corresponding to ψ max from said sub-constellation as a demodulated constellation matrix {circumflex over (Φ)}= Φ j as ψ max < ψ max .