Patent ID: 8811300

Claim:
A method for providing a midamble channel in an orthogonal frequency division multiple access (OFDMA) system, the method comprising: allocating the midamble channel in a subframe having multiple resource blocks by a base station, wherein the resource blocks span over a two-dimensional radio resource region having an array of subcarriers along frequency domain and an array of OFDM symbols along time domain, wherein the midamble channel is allocated to be shared among different transmit antennas; and transmitting midamble signals via the midamble channel for such that the midamble signals occupy a single OFDM symbol within the subframe, wherein the midamble channel is allocated either in the first OFDM symbol or in the last OFDM symbol of the resource blocks of the subframe, wherein the remaining consecutive OFDM symbols of the same resource blocks are applied with Space Frequency Block Coding (SFBC) for data transmission, and wherein the midamble signals are transmitted for facilitation to calculate a channel quality indicator for a frequency band of a downlink channel.