Method and apparatus for reception of long range signals in bluetooth
View Patent ↗The invention of a method and an apparatus for reception of long transmission range Bluetooth signals impaired by multipath are disclosed. The new reception method and apparatus proposed allows to increase the transmission range for data transmission in Bluetooth. The invention proposes the use of a new FDE adapted to SC transmission without a GI or CP. The proposed FDE very successfully mitigates ISI while being very implementation-friendly.
1. Apparatus for reception of long-range signals in Bluetooth for all transmission modes on power class 1, power class 2 and power class 3, the apparatus comprising:
a first equalizer, receiving and processing first packet data;
a first GPSK demodulator, receiving said first packet data from said first equalizer and demodulating said first packet data;
a root-raised-cosine (RRC) filter, downsampling second packet data;
a second equalizer, receiving and processing third packet data and fourth packet data, wherein said second equalizer has an impulse response limited by circular convolution with a rectangular window RW transformed into frequency domain
d
^
MMSE
=
F
-
1
{
(
(
F
{
h
^
}
)
*
(
F
{
h
^
}
)
*
·
F
{
h
^
}
+
σ
2
⊗
RW
)
·
F
(
r
)
}
or by multiplication with a rectangular window rwin time domain for short FFT/IFFT size
d
^
MMSE
=
F
-
1
{
F
{
F
-
1
{
(
F
{
h
^
}
)
*
(
F
{
h
^
}
)
*
·
F
{
h
^
}
+
σ
2
}
·
rw
}
·
F
(
r
)
}
a Pi/4-DQPSK demodulator, receiving said third packet data from said second equalizer and demodulating said third packet data; and
an 8-DPSK demodulator, receiving fourth packet data from said second equalizer and demodulating said fourth packet data.
2. The apparatus for reception of long-range signals in Bluetooth according to claim 1 , further comprising a de-multiplexer receiving signals from antenna and producing packet header and packet data.
3. The apparatus for reception of long-range signals in Bluetooth according to claim 2 , further comprising a second GFSK demodulator, receiving and processing said packet header.
4. The apparatus for reception of long-range signals in Bluetooth according to claim 2 , further comprising a first switch receiving said packet data from said de-multiplexer to output said first packet data or said second packet data.
5. The apparatus for reception of long-range signals in Bluetooth according to claim 2 , further comprising a second switch receiving said second packet data from said root-raised-cosine (RRC) filter to produce said third packet data or said fourth packet data to said second equalizer.
6. The apparatus for reception of long-range signals in Bluetooth according to claim 1 , wherein said first equalizer is an FFT-based or IFFT-based equalizer.
7. The apparatus for reception of long-range signals in Bluetooth according to claim 1 , wherein said first packet data is basic rate transmit data.
8. The apparatus for reception of long-range signals in Bluetooth according to claim 1 , wherein said second equalizer is an FFT-based or IFFT-based equalizer.
9. The apparatus for reception of long-range signals in Bluetooth according to claim 1 , wherein said second packet data, third packet data and fourth packet data are enhance data rate (EDR) transmit data.