Patent ID: 7746945

Claim:
A space-time diversity transmitter that includes (a) n transmitting antennas, where n is greater than one, (b) first encoder responsive to an applied information bit stream, said encoder developing n symbol streams, and (c) a constellation mapper responsive to said n symbol streams, for mapping symbols of each of said n symbol streams into a standard signal constellation to create a corresponding mapped stream, said constellation mapper applying each of the created n mapped streams to a different one of said n antennas in blocks of N t mapped symbols that are synchronized in time to each other, the improvement comprising: a training generator for generating either n sequences of signals or a sequence of signals that contains n subsequences of signal; a second encoder for creating n training symbol sequences from said signals created by said training generator, each containing N t symbols; and said constellation mapper is configured to map said n training sequences onto a standard constellation to develop n mapped training sequences, and to apply the n mapped training sequences to said n antennas at times when said constellation mapper stops applying said n mapped stream to said n antennas; where said n training sequences have an impulse-like autocorrelation function and zero cross correlation.