Multipath delay spread measurement for indoor wireless device-to-device communications

One of many ways in increasing the system capacity and spectral efficiency aside from adding the number of base stations is the implementation of device-to-device (D2D) communication. In D2D communication, user is allowed to communicate with other user directly via D2D link controlled by BS. However, it is known that indoor environment cause multipath, which can be more severe for communicating devices that are located in a rack together with other objects. Therefore, the channel measurement of indoor D2D communication for devices in a rack is important to do. The measurement in this paper covers NLOS propagation with 3 pairs of transmitter and receiver locations in rack environment. Finally, baseband complex channel impulse response and average power delay profile of device-to-device communication are observed. From the result, the statistic of the measured multipath delay spread was observed that the value of mean excess delay were below 20 ns. It was also found that the longer the distance (i.e., difference of levels in the rack between transmitter and receiver) the higher the delay spread.