1. A system comprising:
an input configured to obtain a communications signal of a channel, where the communications signal includes video information;
a first equalization unit to receive the communications signal and perform a time-invariant equalization, where the first equalization unit is responsive to a time-invariant channel response;
a decision unit responsive to an output of the first equalization unit;
an estimation unit to generate a time-varying channel response, where the estimation unit is responsive to an output of the decision unit; and
a second equalization unit to perform a time-varying equalization, where the second equalization unit is responsive to an output of the estimation unit.
2. The system of claim 1, comprising: an initial response estimator configured to estimate the time-invariant channel response based on one or more pilot signals of the communications signal.
3. The system of claim 2, comprising:
a one-dimensional Fast Fourier Transform unit coupled between the first equalization unit and the communications signal;
a one-dimensional Inverse Fast Fourier Transform unit coupled between the estimation unit and the output of the decision unit; and
a two-dimensional Fast Fourier Transform unit coupled between the second equalization unit and the output of the estimation unit.
4. The system of claim 2, where the decision unit is a first decision unit, the system comprising:
a second decision unit responsive to an output of the second equalization unit; and
an iteration control to determine whether to perform one or more iterations of time-varying channel response estimation, where the iteration control is responsive to the second decision unit.
5. The system of claim 1, where the communications signal of the channel conforms to a digital video broadcast standard.
6. The system of claim 1, comprising: circuits to receive signals from multiple different sources and to output a television signal to a display.
7. The system of claim 6, comprising a set top box.
8. The system of claim 6, where the circuits comprise high definition television (HDTV) signal processing and control circuits.
9. The system of claim 8, comprising the display.
10. A system comprising:
a source device to transmit a communications signal over a channel;
a receiver configured to obtain the communications signal from the channel and to equalize the communications signal by generating an initial decision signal for the communications signal in a frequency domain, converting the initial decision signal to a time domain, estimating one or more time-varying time-domain channel responses based on the converted initial decision signal, and removing channel effects from the communications signal using the one or more time-varying time-domain channel responses in the frequency domain.
11. The system of claim 10, where the receiver is further configured to equalize the communications signal by estimating a time-invariant channel response based on one or more pilot signals of the communications signal.
12. The system of claim 10, where the receiver is configured to convert the initial decision signal to the time domain using a one-dimensional Inverse Fast Fourier Transform, and the receiver is configured to use the one or more time-varying time-domain channel responses by first converting the one or more time-varying time-domain channel responses to the frequency domain using a two-dimensional Fast Fourier Transform.
13. The system of claim 10, where the receiver is further configured to equalize the communications signal by generating a second decision signal for the communications signal in the frequency domain, and determine whether to perform one or more iterations of time-varying channel response estimation based on the second decision signal.
14. The system of claim 10, where the communications signal of the channel conforms to a digital video broadcast standard.
15. The system of claim 10, further comprising a high definition television including the receiver.
16. The system of claim 10, further comprising a vehicle including the receiver.
17. The system of claim 10, further comprising a cell phone including the receiver.
18. The system of claim 10, further comprising a set top box including the receiver.
19. The system of claim 10, further comprising a media player including the receiver.
20. The system of claim 10, where the source device transmits an orthogonal frequency-division multiplexed (OFDM) signal.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A rear structure of a vehicle including a roof trim which is made of a flexible material and disposed on a lower surface of a ceiling part of the vehicle, a rear pillar trim which is made of a synthetic resin harder than the roof trim and disposed so as to cover a rear pillar located in the rear of the vehicle, and a side window glass which is disposed ahead of the rear pillar trim and whose upper end is located outer than the roof trim in a width direction of the vehicle,
the rear structure comprising an air bag device including a curtain member which is fixedly attached to a vehicle body and operable to inflate with a gas pressure supplied upon a predetermined condition to thereby spread over at least an inner surface of the side window glass from a side end of the roof trim and a front surface of the rear pillar,
wherein a roof side trim is provided between a vicinity of an upper end of the side window glass and the roof trim, and a rear end of the roof side trim overlaps with a front upper end of the rear pillar trim with the rear end positioning inner than the front upper end so that the curtain member spreads from an inner end of the roof side trim and a boundary between the rear end of the roof side trim toward a cabin space of the vehicle.
2. The rear structure of the vehicle according to claim 1, wherein a spreading direction of the curtain member passes an inner portion of the rear end of the roof side trim.
3. The rear structure of the vehicle according to claim 2, wherein the curtain member is disposed along the overlapping zone of the rear end of the roof side trim and the front upper end of the rear pillar trim.
4. The rear structure of the vehicle according to claim 3, wherein the front upper end of the rear pillar trim extends, in plan view, obliquely in a rear and outer direction.
5. The rear structure of the vehicle according to claim 4, wherein an inner side end of the roof side trim overlaps with a side end of the roof trim with the inner side end positioning inner than the side end of the roof trim so that the curtain member spreads from the overlapping zone of the inner side end of the roof side trim and the side end of the roof trim toward a cabin space of the vehicle.
6. The rear structure of the vehicle according to claim 5, wherein the vehicle further comprises a middle pillar disposed ahead of the rear pillar, and a middle pillar trim covering the middle pillar, and a front end of the roof side trim overlaps with a rear upper end of the middle pillar trim with the front end positioning inner than the rear upper end.
7. The rear structure of the vehicle according to claim 6, wherein the curtain member includes an expansion portion which expands between the rear pillar and the side window glass when the curtain member spreads.
8. The rear structure of the vehicle according to claim 7, wherein the roof side trim is provided with a clip member at a vicinity of a rear end of the roof side trim for detachably attaching the roof side trim to the vehicle body.
9. The rear structure of the vehicle according to claim 8, wherein the clip member is made of a metal material.
10. The rear structure of the vehicle according to claim 9, wherein the rear pillar trim is mounted to the vehicle in a state that an upper rear section of the rear pillar trim is positionally limited for a thermal expansion while an upper front section of the rear pillar trim is positionally unlimited for a thermal expansion.
11. The rear structure of the vehicle according to claim 1, wherein the curtain member is disposed along the overlapping zone of the rear end of the roof side trim and the front upper end of the rear pillar trim.
12. The rear structure of the vehicle according to claim 1, wherein the front upper end of the rear pillar trim extends, in plan view, obliquely in a rear and outer direction.
13. The rear structure of the vehicle according to claim 1, wherein an inner side end of the roof side trim overlaps with a side end of the roof trim with the inner side end positioning inner than the side end of the roof trim so that the curtain member spreads from the overlapping zone of the inner side end of the roof side trim and the side end of the roof trim toward a cabin space of the vehicle.
14. The rear structure of the vehicle according to claim 1, wherein the vehicle further comprises a middle pillar disposed ahead of the rear pillar, and a middle pillar trim covering the middle pillar, and a front end of the roof side trim overlaps with a rear upper end of the middle pillar trim with the front end positioning inner than the rear upper end.
15. The rear structure of the vehicle according to claim 1, wherein the curtain member includes an expansion portion which expands between the rear pillar and the side window glass when the curtain member spreads.
16. The rear structure of the vehicle according to claim 1, wherein the roof side trim is provided with a clip member at a vicinity of a rear end of the roof side trim for detachably attaching the roof side trim to the vehicle body.
17. The rear structure of the vehicle according to claim 1, wherein the rear pillar trim is mounted to the vehicle in a state that an upper rear section of the rear pillar trim is positionally limited for a thermal expansion while an upper front section of the rear pillar trim is positionally unlimited for a thermal expansion.