A statistical model for wideband inhouse radio channels

An inhouse radio channel is statistically characterized by the mean excess delay, the RMS delay spread, the coherence bandwidth, and a rough estimate of the coherence time for the line-of-sight and the obstructed wave propagation path in two different indoor environments. A cumulative probability function of the relative attenuations and the excess delay times of the multipath signals are additionally used for the design of a wideband cordless phone system. The investigations were performed for the specifications of some design parameters of a direct-sequence spread-spectrum code-division multiple-access cordless phone system which uses 20 code sets, each comprising 17 Gold sequences of a length of 1023 b. The N-path RAKE-type receiver structure greatly assists in overcoming problems of multipath propagation using a bandwidth of 2×32 MHz for the base-to-portable and portable-to-base transmission. The clear advantage of wideband modulation systems over conventional narrowband systems can be seen for inhouse transmissions