BER of IEEE 802.11ad OFDM radios vs. carrier frequency in real 60 GHz indoor channels

Abstract

Abstract-Multi-gigabit 60 GHz radios are expected to match QoS requirements of modern multimedia applications. Several published standards were defined based on performance evaluations over standard channel models. Unfortunately, those models, and most models available in the literature, do not take into account the behavior of 60 GHz channels at different carrier frequencies, thus no guidelines are provided for the selection of the best suitable frequency band for a given service. This paper analyzes the impact of changes in multipath profiles, due to both frequency and distance, on the BER performance achieved by IEEE 802.11ad 60 GHz radios. Our analysis is based on real experimental channel impulse responses recorded through an indoor measurement campaign in seven sub-bands from 54 to 65 GHz with a break at 60 GHz at distances from 1 to 5 m. The small-scale fading is modeled by Rician distributions with K-factors extracted from experimental data, which are shown to give good agreement with the empirical distributions. A strong dependence of performance on both frequency and distance due to the sole multipath is observed, which calls for an appropriate selection of the best suitable frequency band according to the service required by the current session over the 802.11ad link.

Improved Channel Estimation and Equalization for Single-Carrier IEEE 802.11ad Receivers

“…A specific feature of [15] is the use of the 60 GHz indoor channel model [16], [17], obtained from measurements done in Brno, Czech Republic. A performance study of IEEE 802.11ad is also done in [18], where the 60 GHz channel is modeled using a Rician distribution.…”

Performance evaluation of UWB signaling at mmWaves

“…It is worth noting that we do not take into account higher numbers of fingers, due to the fact that 16 fingers are sufficient to reach the performance of the ARake in all considered cases. Our previous study on BER performance of 802.11ad OFDM radios, realized within the same measurement scenario using the standard-defined modulation and coding schemes (MCSs) in 802.11ad, pointed out that performance is very sensitive to high carrier frequency, especially for the highest order 64-QAM (LDPC coded) that is naturally dedicated to high data rates up to 6.756 Gbps in OFDM multi-carrier transmission mode [14]. For carrier frequencies above 60 GHz and transmission distances larger than 1 m strong BER degradation was experienced, due to the fact that carrier frequency directly affects the composition of MPCs, since a frequency's increase reflects to an increase of the signal energy of the diffuse part at expenses of a reduction of the signal energy conducted by the first path.…”