1. A communication system, usable with a wireless communication channel, comprising: a transmitting configuration arranged to transmit via said channel a training sequence usable for channel impulse response (CIR) estimation, said training sequence comprising a first pseudonoise (PN) sequence grouping including a selected PN sequence followed by a repeated portion of said selected PN sequence, a series of additional PN sequence groupings following said first PN sequence grouping, said series comprising at least one additional PN sequence grouping including a distinct PN sequence followed by a repeated portion of said distinct PN sequence, said distinct PN sequence differing from said selected PN sequence, and intermediate integers positioned between said PN sequence groupings, said intermediate integers comprising a selected number of integers of at least one selected value; and a receiving configuration arranged to process said training sequence as received via said channel (i) to provide a first CIR observation by use of said first PN sequence grouping as received and at least one additional CIR observation by use of said series of additional PN sequence groupings and (ii) to provide a CIR estimation via an averaging of values of said first and additional CIR observations.