Radio receiver
A radio receiver, configured to use an impulse UWB, includes: a reception antenna which receives the impulse UWB, a reception unit which amplifies the received impulse UWB and detects an envelope of the impulse UWB, maximum-peak and minimum-peak detection units which detect a maximum value and minimum value of the envelope, respectively, a comparator which acquires signal data from the envelope with an initial threshold value, a baseband unit which measures an error rate of the signal data, an MPU which calculates a correction value based on the error rate, and an arithmetic unit which calculates a corrected threshold value based on the maximum, minimum and correction values. The arithmetic unit transmits the corrected threshold value to the comparator. The comparator acquires the signal data from the envelope based on the corrected threshold value transmitted from the arithmetic unit.
1. A radio receiver configured to use an impulse UWB, the radio receiver comprising:
a reception antenna configured to receive the impulse UWB;
a reception unit configured to: amplify the received impulse UWB, and perform detection of an envelope of the impulse UWB;
a maximum-peak detection unit configured to detect a maximum value of the envelope;
a minimum-peak detection unit configured to detect a minimum value of the envelope;
a comparator configured to acquire signal data from the envelope with an initial threshold value;
a baseband unit configured to measure an error rate of the signal data;
an MPU configured to calculate a correction value based on the error rate; and
an arithmetic unit configured to: calculate a corrected threshold value based on the maximum value, the minimum value, and the correction value, and to transmit the corrected threshold value to the comparator,
wherein the comparator acquires the signal data from the envelope based on the corrected threshold value transmitted from the arithmetic unit.
2. The radio receiver according to claim 1 , wherein the arithmetic unit performs arithmetic of Expression (1), based on the maximum value X, the minimum value Y, and the correction value Z, calculates a corrected threshold value Vt, and transmits the corrected threshold value Vt to the comparator
[
Mathematical
Formula
1
]
Vt
=
X
-
Y
Z
+
Y
.
(
1
)
3. The radio receiver according to claim 2 , wherein a bit error rate is used as the error rate, and the MPU calculates the correction value based on the bit error rate.
4. The radio receiver according to claim 3 , further comprising:
a plurality of the reception units; and
an adder configured to add the envelopes from the plurality of the reception units.
5. The radio receiver according to claim 3 , wherein the baseband unit measures the error rate per a predetermined period.
6. The radio receiver according to claim 2 , wherein a packet error rate is used as the error rate, and the MPU calculates the correction value based on the packet error rate.
7. The radio receiver according to claim 6 , further comprising:
a plurality of the reception units; and
an adder configured to add the envelopes from the plurality of the reception units.
8. The radio receiver according to claim 6 , wherein the baseband unit measures the error rate per a predetermined period.
9. The radio receiver according to claim 2 , further comprising:
a plurality of the reception units; and
an adder configured to add the envelopes from the plurality of the reception units.
10. The radio receiver according to claim 9 , wherein the baseband unit measures the error rate per a predetermined period.
11. The radio receiver according to claim 2 , wherein the baseband unit measures the error rate per a predetermined period.
12. The radio receiver according to claim 1 , wherein a bit error rate is used as the error rate, and the MPU calculates the correction value based on the bit error rate.
13. The radio receiver according to claim 12 , further comprising:
a plurality of the reception units; and
an adder configured to add the envelopes from the plurality of the reception units.
14. The radio receiver according to claim 12 , wherein the baseband unit measures the error rate per a predetermined period.
15. The radio receiver according to claim 1 , wherein a packet error rate is used as the error rate, and the MPU calculates the correction value based on the packet error rate.
16. The radio receiver according to claim 15 , further comprising:
a plurality of the reception units; and
an adder configured to add the envelopes from the plurality of the reception units.
17. The radio receiver according to claim 15 , wherein the baseband unit measures the error rate per a predetermined period.
18. The radio receiver according to claim 1 , further comprising:
a plurality of the reception units; and
an adder configured to add the envelopes from the plurality of the reception units.
19. The radio receiver according to claim 18 , wherein the baseband unit measures the error rate per a predetermined period.
20. The radio receiver according to claim 1 , wherein the baseband unit measures the error rate per a predetermined period.