Patent ID: 8582526

Claim:
A method for multi packet communication in an asynchronous wireless system having an open systems interconnection (OSI) model comprising: transmitting at least two packets of 2M digital signals denoted by symbols, s 1 , s 2 , . . . , s 2M−1 , s 2M , from a plurality of transmitters without other transmission taking place within a predetermined number of symbol durations from each side of each packet by transmitting at least two packets to provide a guard interval around the at least two packets, wherein each transmitter generates digital signals denoted as at least two super-symbols, namely S 1 and S 2 according to an Alamouti coding scheme as: S 1 =(s 1 , s 2 , . . . , s M ) S 2 =(s M+1 , s M+2 , . . . , s 2M ) so that each transmitter transmits digital signals corresponding to M symbols of super-symbols S 1 and S 2 in a first transmission interval from a corresponding first and second antenna, respectively, and so that each transmitter transmits digital signals corresponding to M symbols of super-symbols −S* 2 and S* 1 in a second transmission interval from the first and the second antenna, respectively; asynchronously receiving the packets of transmitted digital signals at a receiver which synchronizes with one of the packets, and where the received digital symbols in the corresponding super symbol of the other one of the at least two packets causes inter-symbol interference a finite number of its nearest neighbors among the received digital symbols in the corresponding super symbol due to finite impulse response implementation of a pulse shaping filter and sampling error at the receiver; generating a symmetric Alamouti structure for the asynchronously received packets subject to inter-symbol interference by folding the asynchronously received signal on itself and multiplying by a factor of −1; canceling the inter-symbol interference in the asynchronously received packets to generate a remaining signal; and decoding the symmetric Alamouti structure for the remaining signal.