Data transmission apparatus for DS/CDMA system equipping MIMO antenna system

A receiving apparatus for a direct sequence (DS) /code division multiple access (CDMA) equipping multiple-input multiple-output antenna system, comprising;

• a plurality of receiving antennas for receiving a receiving analog signal transmitted from a transmitter;
• matching filtering means for converting the receiving analog signal to a digital signal;
• input signal generating means for gathering transmitting data in the digital signal and outputting the gathered transmitting data;
• de-spreading means including a plurality of de-spreaders in linearly proportion to the number of paths in multipath for gathering energy, the number of transmitting antennas in the transmitter and the number of the spreading codes for computing an scalar product value of a spreading code and a scramble code in the transmitting data;
• channel estimating means including a plurality of channel estimators as many as the number of the receiving antennas for estimating channels based on a pilot signal from the de-spreading means;
• combining means for gathering energies of each transmitting data by using outputs of de-spreading means and the channel estimating means;
• and
• data deciding means for deciding an estimation value of transmitting symbol by using the combined signal from the combining means.

A receiving apparatus for a direct sequence (DS) /code division multiple access (CDMA) equipping multiple-input multiple-output (MIMO) antenna system, comprising;

• a plurality of receiving antennas for receiving a receiving signal transmitted from a transmitter;
• input signal generating means for gathering transmitting data in the receiving signal and outputting the gathered transmitting data;
• adaptive filtering means for filtering a complex receiving signal according to a tab weight, which is controlled in a predetermined cycle and outputting a filtered data;
• channel estimating means for estimating a phase and an amplitude of a channel between one of transmitting antennas and one of receiving antennas based on the filtered data and outputting an estimation data as a result of estimation;
• signal recovering means for recovering the receiving signal to an original signal by combining the estimation data and filtered data with all components of multipath;
• selecting means for selecting one of the original signal and a training data signal supplied by the receiver and outputting a selected signal;
• reference signal generating means for generating a reference signal based on the selected signal and the estimation data;
• error calculating means for calculating error between the filtered data and the reference signal by comparing the filtered data and the reference signal;
• tab weight controlling means for controlling the tab weight of the adaptive filtering unit based on a constraint MMSE criterion having at least one condition.

A transmission apparatus for a direct sequence (DS) / code division multiple access (CDMA) equipping multiple-input multiple-output antenna system (MIMO), comprising;

• serial to parallel converting means for converting serially inputted high speed data to parallel data sequences;
• spreading means for spreading the parallel data sequences based on a spreading codes each of which is orthogonal to the parallel data sequence, to generate a plurality of spread data sequences;
• pilot signal spreading means for spreading pilot signals to generate a plurality of spread pilot signal;
• combining means for combining each of the spread data sequences and each of the pilot signal, to generate a combined data;
• scrambling means for scrambling each of the combined data sequences by using a different scrambling code in order to generate scrambled data;
• a plurality of transmitting antennas for independently transmitting the scrambled data. a plurality of receiving antennas for receiving the scrambled data, which are analog signals transmitted from a transmitter;
• matching filtering means for converting the receiving analog signal to a digital signal;
• input signal generating means for gathering transmitting data in the digital signal and outputting the gathered transmitting data;
• de-spreading means including a plurality of de- spreaders in linearly proportion to the number of paths in multipath for gathering energy, the number of transmitting antennas in the transmitter and the number of the spreading codes for computing an scalar product value of a spreading code and a scramble code in the transmitting data;
• channel estimating means including a plurality of channel estimators as many as the number of the receiving antennas for estimating channels based on a pilot signal from the de-spreading means;
• combining means for gathering energies of each transmitting data by using outputs of de-spreading means and the channel estimating means;
• and
• data deciding means for deciding an estimation value of transmitting symbol by using the combined signal from the combining means.

A transmission apparatus for a direct sequence (DS) / code division multiple access (CDMA) equipping multiple-input multiple-output antenna system, comprising;

• serial to parallel converting means for converting serially inputted high speed data to parallel data sequences;
• spreading means for spreading the parallel data sequences based on a spreading codes each of which is orthogonal to the parallel data sequence, to generate a plurality of spread data sequences;
• pilot signal spreading means for spreading pilot signals to generate a plurality of spread pilot signal;
• combining means for combining each of the spread data sequences and each of the pilot signal, to generate a combined data;
• scrambling means for scrambling each of the combined data sequences by using a different scrambling code in order to generate scrambled data;
• a plurality of transmitting antennas for independently transmitting the scrambled data;
• a plurality of receiving antennas for receiving the scrambled data transmitted from a transmitting antennas;
• input signal generating means for gathering transmitting data in the receiving signal and outputting the gathered transmitting data;
• adaptive filtering means for filtering a complex receiving signal according to a tab weight, which is controlled in a predetermined cycle and outputting a filtered data;
• channel estimating means for estimating a phase and an amplitude of a channel between one of transmitting antennas and one of receiving antennas based on the filtered data and outputting an estimation data as a result of estimation;
• signal recovering means for recovering the receiving signal to an original signal by combining the estimation data and filtered data with all components of multipath;
• selecting means for selecting one of the original signal and a training data signal supplied by the receiver and outputting a selected signal;
• reference signal generating means for generating a reference signal based on the selected signal and the estimation data;
• error calculating means for calculating error between the filtered data and the reference signal by comparing the filtered data and the reference signal;
• tab weight controlling means for controlling the tab weight of the adaptive filtering unit based on a constraint MMSE criterion having at least one condition.