Abstract
Bluetooth enhanced data rate wireless channel can support higher-quality video streams compared to previous versions of Bluetooth. Packet loss when transmitting compressed data has an effect on the delivered video quality that endures over multiple frames. To reduce the impact of radio frequency noise and interference, this paper proposes adaptive modulation based on content type at the video frame level and content importance at the macroblock level. Because the bit rate of protected data is reduced, the paper proposes buffer management to reduce the risk of buffer overflow. A trizone buffer is introduced, with a varying unequal protection policy in each zone. Application of this policy together with adaptive modulation results in up to 4 dB improvement in objective video quality compared to fixed rate scheme for an additive white Gaussian noise channel and around 10 dB for a Gilbert-Elliott channel. The paper also reports a consistent improvement in video quality over a scheme that adapts to channel conditions by varying the data rate without accounting for the video frame packet type or buffer congestion.
Highlights
Bluetooth [1], standardized as IEEE 802.15.1, is a shortrange radio frequency (RF) interconnection, which can be expanded to form a piconet, with one master node and up to seven slaves
We investigate unequal protection (UP) of encoded video data transmitted from master to slave, in the face of cross-traffic passing from slave to slave via the Bluetooth piconet master
Unequal protection in Bluetooth streaming has been shown by us to achieve a significant improvement in delivered video quality over the best fixed bit rate scheme according to crosstraffic conditions
Summary
Bluetooth [1], standardized as IEEE 802.15.1, is a shortrange radio frequency (RF) interconnection, which can be expanded to form a piconet, with one master node and up to seven slaves. In Bluetooth, there is no direct slave-slave communication, as all cross-traffic must pass through a Bluetooth master node. Such usage certainly occurs in Bluetooth personal area networks for wearable computers [2], whereas IEEE 802.11 wireless local area networks are less suitable for this purpose, for example, because of an order-of-magnitude higher-power requirement (100–350 mA as opposed to 1 mA). Providing differing levels of error coding to achieve UP is widely practiced. This is usually designated as unequal error protection (UEP) and not UP. It is possible to apply modulation adaptation to achieve UP, in orthogonal frequency division multiplexing (OFDM) systems [3]. Bluetooth EDR provides several forms of modulation, though not through OFDM
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