Interference mitigation proposals exploiting antenna diversity using space time block codes for Bluetooth enabled devices

Abstract

-Previous research work has focused on residential coverage and achievable data rates using the Bluetooth Personal Area Network (PAN) standard. To meet the bit rate needs of future consumer electronic devices, M-PSK modulation schemes were proposed as likely candidates for high data rate Bluetooth extension. Frequency hopping statistics obtained for both the 79-hop and 23-hop systems in Bluetooth for data medium (DM) and data high (DH) packets in asynchronous mode show a clear need for mitigating interference. This can be achieved by employing synchronous transmissions in order to obtain reliable throughputs, particularly for time-bounded devices. This paper investigates the advantages of exploiting antenna diversity using space time block codes (STBC) with maximum likelihood decoding for high data rate Bluetooth enabled devices in synchronous and asynchronous transmissions. Results are presented for Bluetooth systems employing no antenna diversity and systems employing two transmit and two receive antennas using STBC. Results show that the reliability of both time-bounded and non-time bounded Bluetooth enabled devices can be enhanced by exploiting STBC coupled with suitable interference cancellation techniques.

On the benefits of diversity schemes for Bluetooth coverage extension in the presence of IEEE802.11g interference

“…Finally, substituting (31) in (8), we derive the mean BLEP for a N-branches SD receiver and Ricean fading channel.…”

“…where Φ 1 (s, x) = ∞ x e −st f γ (t)dt is the marginal MGF of γ of a single diversity branch [17]. Hence, we obtain also the mean BLEP expression in case of MRC receiver by simply substituting (33) in (8).…”

An investigation of the coexistence of 802.11g WLAN and high data rate bluetooth enabled consumer electronic devices in indoor home and office environments

“…The results show that with high error floors, the high PER values do not allow sufficient throughput for acceptable quality time-bounded applications, such as digital video and TV transmission. In [16], it was shown that by exploiting antenna diversity on Bluetooth and enhanced Bluetooth enabled devices using space time block codes (STBC) with maximum likelihood decoding, considerable performance improvement could be attained by mitigating interference between Bluetooth enabled devices. A simple space time block coding scheme was proposed by Alamouti in [17].…”

Selection Diversity for Bluetooth in the Presence of IEEE802.11G Interference

“…In fact, due to the large penetration in the mass market of unlicensed communication devices operating in the industrial, scientific and medical (ISM) 2.4 GHz band, wireless connections performance is often reduced due to the presence of interfering devices, especially belonging to wireless local area network (WLAN) [5][6][7]. Hence, there is a growing concern for mutual interference between different BT and IEEE802.11b/g WLAN consumer electronic devices and solutions to improve the coexistence of the involved systems are currently under investigation [2, 4,8,9]; many of them propose solutions to the interference problem based on power control adjustments and scheduling policies to be implemented by BT devices, others involves antenna diversity presenting simulation results.…”