Wireless transmitting and receiving device and method
A wireless device, method, and signal for use in communication of a wireless packet between transmitting device and a wireless receiving device via a plurality of antennas, wherein a signal generator generates wireless packet including a short-preamble sequence used for a first automatic gain control (AGC), a first long-preamble sequence, a signal field used for conveying a length of the wireless packet, an AGC preamble sequence used for a second AGC to be performed after the first AGC, a second long-preamble sequence, and a data field conveying data. The AGC preamble sequence is transmitted in parallel by the plurality of antennas.
1. A wireless receiving device for communicating with a wireless transmitting device with a wireless packet, the wireless receiving device comprising:
a receiver configured to receive the wireless packet, the wireless packet including:
a short-preamble used for a first automatic gain control (1st AGC) at the wireless receiving device,
a first long-preamble used for an estimation of a first channel impulse response between the wireless transmitting device and the wireless receiving device,
a signal field following the short-preamble and the first long-preamble, and used for conveying information regarding the wireless packet,
an AGC preamble following the signal field, and used for a second automatic gain control (2nd AGC) performed after the first automatic gain control at the wireless receiving device,
a second long-preamble used for an estimation of a second channel impulse response between the wireless transmitting device and the wireless receiving device, and
a data field conveying data; and
a gain controller configured to control a gain of the wireless packet based upon receiving the AGC preamble;
wherein the AGC preamble and the data field are transmitted in parallel via a plurality of antennas, and
the short-preamble, the first long-preamble, and the signal field are transmitted via at least one of the antennas.
2. The wireless receiving device according to claim 1 , further compnsing:
a variable gain amplifier configured to amplify the wireless packet.
3. The wireless receiving device according to claim 1 , further comprising:
an analog-to-digital converter configured to convert a signal output from the variable gain amplifier into a digital signal.
4. The wireless receiving device according to claim 3 , further comprising:
a channel impulse response estimator configured to estimate the first channel impulse response and the second channel impulse response using the first long-preamble and the second long-preamble included in the digital signal output from the analog-to-digital converter; and
a demodulator configured to demodulate the digital signal output from the analog-to-digital converter, in accordance with the estimated first channel impulse response and the estimated second channel impulse response.
5. The wireless receiving device according to claim 1 , wherein the information is regarded as a length of the data field.
6. The wireless receiving device according to claim 1 , wherein cyclic shifting of temporal positions is applied to the AGC preamble.
7. The wireless receiving device according to claim 1 , wherein the short-preamble, the first long-preamble, and the signal field are recognizable by both a first communication system and a second communication system; and
the AGC preamble and the data field are recognizable by the second communication system.
8. The wireless receiving device according to claim 7 , wherein the second communication system has backwards compatibility with the first communication system.
9. The wireless receiving device according to claim 7 , wherein the second communication system has interoperability with the first communication system.
10. The wireless receiving device according to claim 7 , wherein
the first communication system conforms to IEEE802.11a, and
the second communication system conforms to IEEE802.11n.
11. A wireless receiving method for communicating with a wireless transmitting device with a wireless packet, the method comprising:
receiving the wireless packet, the wireless packet including:
a short-preamble used for a first automatic gain control (1st AGC) at the wireless receiving device,
a first long-preamble used for a first estimation of a first channel impulse response between the wireless transmitting device and the wireless receiving device,
a signal field following the short-preamble and the first long-preamble, and used for conveying information regarding the wireless packet,
an AGC preamble following the signal field, and used for a second automatic gain control (2nd AGC) performed after the first automatic gain control at the wireless receiving device,
a second long-preamble used for a second estimation of a second channel impulse response between the wireless transmitting device and the wireless receiving device, and
a data field conveying data; and
controlling a gain of the wireless packet based upon the received AGC preamble;
wherein the AGC preamble and the data field are transmitted in parallel via a plurality of antennas; and
the short-preamble, the first long-preamble, and the signal field are transmitted via at least one of the antennas.
12. A wireless receiving terminal for communicating with a wireless transmitting device with a wireless packet, the wireless receiving device comprising:
at least one receive antenna; and
a receiver configured to receive the wireless packet via the receive antenna, the wireless packet including:
a short-preamble used for a first automatic gain control (1st AGC) at the wireless receiving terminal,
a first long-preamble used for an estimation of a first channel impulse response between the wireless transmitting device and the wireless receiving terminal,
a signal field following the short-preamble and the first long-preamble, and used for conveying information regarding the wireless packet,
an AGC preamble following the signal field, and used for a second automatic gain control (2nd AGC) performed after the first automatic gain control at the wireless receiving terminal,
a second long-preamble used for an estimation of a second channel impulse response between the wireless transmitting device and the wireless receiving device, and
a data field conveying data; and
a gain controller configured to control a gain of the wireless packet based upon receiving the AGC preamble;
wherein the AGC preamble and the data field are transmitted in parallel via a plurality of transmit antennas attached to the wireless transmitting device, and
the short-preamble, the first long-preamble, and the signal field are transmitted via at least one of the transmit antennas.
13. The wireless receiving terminal according to claim 12 , further comprising:
a variable gain amplifier configured to amplify the wireless packet.
14. The wireless receiving terminal according to claim 12 , further comprising:
an analog-to-digital converter configured to convert a signal output from the variable gain amplifier into a digital signal.
15. The wireless receiving terminal according to claim 14 , further compnsing:
a channel impulse response estimator configured to estimate the first channel impulse response and the second channel impulse response using the first long-preamble and the second long-preamble included in the digital signal output from the analog-to-digital converter; and
a demodulator configured to demodulate the digital signal output from the analog-to-digital converter, in accordance with the estimated first channel impulse response and the estimated second channel impulse response.
16. The wireless receiving terminal according to claim 12 , wherein the information is regarded as a length of the data field.
17. The wireless receiving terminal according to claim 12 , wherein cyclic shifting of temporal positions is applied to the AGC preamble.
18. The wireless receiving terminal according to claim 12 , wherein the short-preamble, the first long-preamble, and the signal field are recognizable by both a first communication system and a second communication system; and
the AGC preamble and the data field are recognizable by the second communication system.
19. The wireless receiving terminal according to claim 18 , wherein the second communication system has backwards compatibility with the first communication system.
20. The wireless receiving terminal according to claim 18 , wherein the second communication system has interoperability with the first communication system.
21. The wireless receiving terminal according to claim 18 , wherein
the first communication system conforms to IEEE802.11a, and
the second communication system conforms to IEEE802.11n.