Data communication apparatus and data communication method

A data communication apparatus comprising:

• a plurality of antennas;
• memorizing means for memorizing received signals provided via said plurality of antennas;
• weight controlling means for calculating first weights by which each of said received signals provided via said plurality of antennas is weighed to be synthesized, while when a channel quality of a radio signal deteriorates, suspending to calculate said first weights, and calculating second weights, using said received signals provided via said plurality of antennas;
• multiplying means for multiplying each of the memorized received signals by said first weights, while when the channel quality of the radio signal deteriorates, multiplying each of said received signals provided via said plurality of antennas by said second weights;
• adding means for synthesizing the multiplication result;
• compensating means for estimating a deterioration of the channel quality of the radio signal, using the synthesis result to compensate for the deterioration;
• and
• detecting means for detecting the compensation result to output to a weighing coefficient controlling means as a parameter to calculate a first weighing coefficient and said second weights.

A data communication apparatus comprising:

• a plurality of antennas;
• a plurality of antenna synthesis receiving means for dividing received signals provided via said plurality of antennas according to a difference of incoming time, calculating weights to synthesize the divided received signal and multiplying said divided received signal by a calculated weighing coefficient to synthesize the divided received signal;
• profile estimating means for newly detecting a received signal provided via said plurality of antennas, said profile estimating means having an output coupled to the data communication apparatus;
• weight controlling means for updating the weights to synthesize the newly detected received signal using the weights already calculated at said plurality of antenna synthesis receiving means as an initial value when an incoming time of said newly detected received signal is close to that of an already detected received signal;
• a plurality of compensating means for estimating a deterioration of a channel quality of a radio signal using the synthesis result by said plurality of antenna synthesis receiving means to compensate for the deterioration;
• adding means for synthesizing the compensated result by said plurality of compensating means;
• and
• detecting means for detecting the synthesis result by said adding means to output to said plurality of antenna synthesis receiving means as a parameter to calculate said weights.

A data communication method comprising:

• memorizing received signals provided via a plurality of antennas;
• calculating first weights by which each of said received signals provided via said plurality of antennas is weighed to be synthesized;
• calculating second weights using said received signals provided via said plurality of antennas;
• multiplying each of said received signals provided via said plurality of antennas by said first weights, while when a channel quality of a radio signal deteriorates, multiplying each of said received signals provided via said plurality of antennas by said second weights;
• synthesizing the multiplication result;
• estimating a deterioration of the channel quality of the radio signal using the synthesis result to compensate for the deterioration;
• and
• detecting the compensation result to output to said a weighing coefficient controlling means and a second weight controlling means as a parameter to calculate a first weighing coefficient and said second weights.

A data communication method comprising:

• dividing received signals provided via the plurality of antennas according to a difference of incoming time;
• calculating the weights to synthesize the divided received signal;
• multiplying said divided received signal by a calculated weighing coefficient to synthesize the divided received signal;
• detecting a newly received signal provided via said plurality of antennas;
• updating weights to synthesize the newly received signal using the weights that are already calculated at said plurality of antenna synthesis receiving means as an initial value when incoming time of said newly received signal is close to that of an already detected received signal;
• estimating a deterioration of a channel quality of a radio signal using the synthesis result to compensate for the deterioration;
• synthesizing the compensated result;
• and
• detecting the synthesis result to use as a parameter to calculate said weights.