Joint channel estimation and data detection method for STBC/OFDM systems

Abstract

The present invention provides a joint channel estimation and data detection method for STBC/OFDM systems, comprising the following steps: a preliminary step, in which, after passing the received signals through an OFDM demodulator, frequency-domain signals R1[k] and R2[k] of the complementary-coded pilot preambles in two successive OFDM symbol times, as well as two successive OFDM data symbols R1(i)[k] and R2(i)[k] at the ith time slot, are obtained; an initial step for setting up the predetermined number Np of the channel path, using complementary-coded pilot preambles to estimate the channel impulse response, then using this estimation result of the channel impulse response to calculate a path selective set Sm,, and furthermore, in accordance with the path selective set Sm, determining the number Lm of the selected paths and the excess delay τm,l of the selected path, and then calculating the initial channel state information vector y(1,0) and the Hessian matrix F; a tracking step, in which the initial value v of the recursion index is set to 1 at first, and the maximum number of recursion is set to V; if the index v of recursion is 1, use sparse pilot subcarriers to calculate channel state information Ĥm[k], and calculate a searching direction vector Ψ that is obtained by using the sparse pilot subcarriers and then calculate a searching direction vector