US5528581A
Expired / Lapsed
US
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Diversity transmission system for sub-band diversity reception
Assignee: US Philips Corp
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Filing: 1993-11-30
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Granted: 1996-06-18
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Expires: 2013-11-30
Abstract
Abstract In a diversity transmission system the problem arises that almost no improvement can be obtained when the signals to be received show frequency selective fading within the band width of the signal to be transmitted. To solve this problem the signal to be received is separated by filter banks into a number of sub-band signals. Corresponding sub-band signals of different filter banks are combined by the combiners into combined sub-band signals. These combined sub-band signals are combined to a broad band signal by a final combiner.
Inventors
- 👤 Paulus G. M. de Bot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:51
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04L; H04L27/00; H04L27/26; H04L27/2601; H04L27/2647; H04B7/04; H04B7/08; H04B7/0837; H04B7/0842; H04B7/0865; H04L1/00; H04L1/02; H04L1/06; H04L27/2602; H04B7/084
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
81 words
Diversity transmission system comprising a transmitter, said transmitter being coupled to a receiver via a plurality of channels, said receiver comprising combining means for combining the output signals of the channels, characterized in that the combining means comprises separating means for separating the output signal of each channel into a plurality of different frequency sub-band signals and in that the combining means comprises frequency sub-band combining means for combining corresponding frequency sub-band signals from different channels into combined frequency sub-band signals.
Claim 2
Dependent Claim
81 words
Diversity transmission system comprising a transmitter, said transmitter being coupled to a receiver via a plurality of channels, said receiver comprising combining means for combining the output signals of the channels, characterized in that the combining means comprises separating means for separating the output signal of each channel into a plurality of different frequency sub-band signals and in that the combining means comprises frequency sub-band combining means for combining corresponding frequency sub-band signals from different channels into combined frequency sub-band signals.
Claim 3
Dependent Claim
29 words
Diversity transmission system according to claim 1 ,characterized in that the receiver comprises a plurality of antennas at different positions for obtaining the output signal of a corresponding channel.
Claim 4
Dependent Claim
30 words
Diversity transmission system according to claim 2, characterized in that the receiver comprises a plurality of antennas having different polarization states for obtaining the output signal of a corresponding channel.
Claim 5
Dependent Claim
39 words
Diversity transmission system according to claim 2, characterized in that the output signal of a channel comprises a Frequency Division Multiplexed signal, and in that a frequency sub-band comprises at least one component of the frequency division multiplexed signal.
Claim 6
Dependent Claim
37 words
Diversity transmission system according to claim 2, characterized in that the frequency sub-band combining means is arranged for determining a weighted frequency sub-band signal from each frequency sub-band signal and for combining the weighted frequency sub-band signals.
Claim 7
Dependent Claim
30 words
Diversity transmission system according to claim 1, characterized in that the receiver comprises a plurality of antennas having different polarization states for obtaining the output signal of a corresponding channel.
Claim 8
Dependent Claim
39 words
Diversity transmission system according to claim 6, characterized in that the output signal of a channel comprises a Frequency Division Multiplexed signal, and in that a frequency sub-band comprises at least one component of the frequency division multiplexed signal.
Claim 9
Dependent Claim
37 words
Diversity transmission system according to claim 6, characterized in that the frequency sub-band combining means is arranged for determining a weighted frequency sub-band signal from each frequency sub-band signal and for combining the weighted frequency sub-band signals.
Claim 10
Dependent Claim
39 words
Diversity transmission system according to claim 1, characterized in that the output signal of a channel comprises a Frequency Division Multiplexed signal, and in that a frequency sub-band comprises at least one component of the frequency division multiplexed signal.
Claim 11
Dependent Claim
23 words
Diversity transmission system according to claim 9, characterized in that the output signal of a channel comprises an Orthogonally Frequency Division Multiplexed signal.
Claim 12
Dependent Claim
37 words
Diversity transmission system according to claim 1 characterized in that the frequency sub-band combining means is arranged for determining a weighted frequency sub-band signal from each frequency sub-band signal and for combining the weighted frequency sub-band signals.
Claim 13
Dependent Claim
74 words
Receiver for receiving a plurality of output signals from a plurality of channels comprising combining means for combining the output signals of the channels, characterized in that the combining means comprises separating means for separating the output signals of the channels into a number of different frequency sub-band signals and in that the combining means comprises frequency sub-band combining means for combining corresponding frequency sub-band signals from different channels into combined frequency sub-band signals.
Claim 14
Dependent Claim
74 words
Receiver for receiving a plurality of output signals from a plurality of channels comprising combining means for combining the output signals of the channels, characterized in that the combining means comprises separating means for separating the output signals of the channels into a number of different frequency sub-band signals and in that the combining means comprises frequency sub-band combining means for combining corresponding frequency sub-band signals from different channels into combined frequency sub-band signals.
Claim 15
Dependent Claim
23 words
Receiver according to claim 12, characterized in that the receiver comprises a plurality of antennas for obtaining the output signals of the channels.
Claim 16
Dependent Claim
63 words
Combining means for combining a plurality of output signals from different channels, characterized in that the combining means comprises separating means for separating the output signals of the channels into a number of different frequency sub-band signals and in that the combining means further comprises frequency sub-band combining means for combining corresponding frequency sub-band signals from different channels into combined frequency sub-band signals.
Claim 17
Dependent Claim
63 words
Combining means for combining a plurality of output signals from different channels, characterized in that the combining means comprises separating means for separating the output signals of the channels into a number of different frequency sub-band signals and in that the combining means further comprises frequency sub-band combining means for combining corresponding frequency sub-band signals from different channels into combined frequency sub-band signals.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-06-18 | 1999-12-18 | 2000-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-06-18 | 2003-12-18 | 2004-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-06-18 | 2007-12-18 | 2008-06-18 | $7700.00 | Window Closed / Lapsed |