US5835526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Channel equalizer for a telecommunication system
Assignee: Qualcomm Inc
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Filing: 1995-11-30
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Granted: 1998-11-10
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Expires: 2015-11-30
Abstract
Abstract In accordance with the invention the channel equalization factors in a communication system can be calculated at a base station and transmitted to a mobile station in order to effect the equalization at reception. Alternatively, the channel equalization can be effected at the base station also in connection with the transmission to the mobile station, in addition to the normal equalization made at reception. The construction of the mobile station is simplified when the channel equalizer or the calculation of the equalization factors can be omitted.
Inventors
- 👤 Juhani Juntti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:33
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L25/03012; H04L25/03019; H04L25/03057; H04L25/03343; H04L2025/03433; H04L2025/03439; H04L2025/03445; H04L2025/03471; H04L2025/03484; H04L2025/0349
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
139 words
A telecommunication system comprising: i) a first transmit/receive (tx/rx) means and a second transmit/receive means; ii) a communication (tx/rx) channel for said first tx/rx means to communicate with said second tx/rx means; and iii) channel equalization means for calculating and for utilizing channel equalization factors, wherein said channel equalization factors are calculable in a first one of said first and second tx/rx means and are transmitted through said communication channel, during a transmit time period, from said first one of said first and second tx/rx means that calculates the channel equalization factors to a second one of said tx/rx means that utilizes said channel equalization factors for generating an equalization to be applied for equalizing a received communication signal that is also transmitted from said first one of said first and second tx/rx means during the transmission time period.
Claim 2
Dependent Claim
139 words
A telecommunication system comprising: i) a first transmit/receive (tx/rx) means and a second transmit/receive means; ii) a communication (tx/rx) channel for said first tx/rx means to communicate with said second tx/rx means; and iii) channel equalization means for calculating and for utilizing channel equalization factors, wherein said channel equalization factors are calculable in a first one of said first and second tx/rx means and are transmitted through said communication channel, during a transmit time period, from said first one of said first and second tx/rx means that calculates the channel equalization factors to a second one of said tx/rx means that utilizes said channel equalization factors for generating an equalization to be applied for equalizing a received communication signal that is also transmitted from said first one of said first and second tx/rx means during the transmission time period.
Claim 3
Dependent Claim
47 words
A telecommunication system as set forth in claim 1, wherein only a part of said channel equalization factors are transmitted from said first one of said first and second tx/rx means to said second one of said first and second tx/rx means during the transmit time period.
Claim 4
Dependent Claim
95 words
A telecommunication system as set forth in claim 2, wherein said channel equalization means is comprised of a feedforward part and a feedback part, wherein said feedforward part of said channel equalization means is disposed in said first one of said first and second tx/rx means, and wherein said feedback part of said channel equalization means is disposed in said second one of said first and second tx/rx means and only channel equalization factors for said feedback part are transmitted to said second one of said first and second tx/rx means through said communication channel.
Claim 5
Dependent Claim
21 words
A telecommunication system as set forth in claim 1, wherein said channel equalization means is a non-linear decision feedback channel equalizer.
Claim 6
Dependent Claim
19 words
A telecommunication system as set forth in claim 1, wherein said channel equalization means is a linear channel equalizer.
Claim 7
Dependent Claim
18 words
A telecommunication system as set forth in claim 1, wherein said equalization means is an adaptive channel equalizer.
Claim 8
Dependent Claim
18 words
A telecommunication system as set forth in claim 1, wherein said telecommunication system is a radio telephone system.
Claim 9
Dependent Claim
40 words
A telecommunication system as set forth in claim 7, wherein said first one of said first and second tx/rx means is a base station and wherein said second one of said first and second tx/rx means is a mobile station.
Claim 10
Dependent Claim
20 words
A telecommunication system as set forth in claim 1, wherein said telecommunication system is a time division multiple access system.
Claim 11
Dependent Claim
20 words
A telecommunication system as set forth in claim 1, wherein said telecommunication system is a frequency division multiple access system.
Claim 12
Dependent Claim
79 words
A telecommunication system as set forth in claim 1, wherein said second one of said first and second tx/rx means is a radiotelephone comprised of a feedback portion of said channel equalization means, wherein said first one of said first and second tx/rx means is a base station comprised of a feedforward portion of said channel equalization means, and wherein said radiotelephone receives, from said communication channel, equalization factors only for said feedback portion of said channel equalization means.
Claim 13
Dependent Claim
204 words
A telecommunication system comprising: i) a first transmit/receive (tx/rx) means and a second transmit/receive means; ii) a communication (tx/rx) channel for said first tx/rx means to communicate with said second tx/rx means; and iii) channel equalization means for calculating and for utilizing channel equalization factors, wherein said channel equalization factors are calculable in a first one of said first and second tx/rx means and are transmitted through said communication channel, during a transmit time period, from said first one of said first and second tx/rx means that calculates the channel equalization factors to a second one of said tx/rx means that utilizes said channel equalization factors for generating an equalization to be applied for equalizing a received communication signal that is also transmitted from said first one of said first and second tx/rx means during the transmission time period, wherein a feedforward part of said channel equalization means is disposed in said first one of said first and second tx/rx means; a feedback part of said channel equalization means is disposed in said second one of said first and second tx/rx means; and only channel equalization factors for said feedback part are transmitted to said second one of said first and second tx/rx means.
Claim 14
Dependent Claim
204 words
A telecommunication system comprising: i) a first transmit/receive (tx/rx) means and a second transmit/receive means; ii) a communication (tx/rx) channel for said first tx/rx means to communicate with said second tx/rx means; and iii) channel equalization means for calculating and for utilizing channel equalization factors, wherein said channel equalization factors are calculable in a first one of said first and second tx/rx means and are transmitted through said communication channel, during a transmit time period, from said first one of said first and second tx/rx means that calculates the channel equalization factors to a second one of said tx/rx means that utilizes said channel equalization factors for generating an equalization to be applied for equalizing a received communication signal that is also transmitted from said first one of said first and second tx/rx means during the transmission time period, wherein a feedforward part of said channel equalization means is disposed in said first one of said first and second tx/rx means; a feedback part of said channel equalization means is disposed in said second one of said first and second tx/rx means; and only channel equalization factors for said feedback part are transmitted to said second one of said first and second tx/rx means.
Claim 15
Independent Claim
169 words
A method for operating a radiotelephone system having a base station and at least one mobile station, the base station and mobile station bidirectionally communicating with radio frequency signals through a communication channel during respective transmit and receive time slots, comprising the steps of: receiving a transmission at the base station from the mobile station during a base station receive time slot; determining in the base station a plurality of channel equalization factors based on the received transmission, the plurality of channel equalization factors reflecting a current radio frequency propagation characteristic of the communication channel; during a next base station transmit time slot, transmitting at least a portion of the determined channel equalization factors to the mobile station, along with communication information; receiving the transmitted portion of the channel equalization factors and the communication information with the mobile station; and using the received channel equalization factors to equalize, in the mobile station, the received communication information in accordance with the current radio frequency propagation characteristic of the communication channel.
Claim 16
Independent Claim
169 words
A method for operating a radiotelephone system having a base station and at least one mobile station, the base station and mobile station bidirectionally communicating with radio frequency signals through a communication channel during respective transmit and receive time slots, comprising the steps of: receiving a transmission at the base station from the mobile station during a base station receive time slot; determining in the base station a plurality of channel equalization factors based on the received transmission, the plurality of channel equalization factors reflecting a current radio frequency propagation characteristic of the communication channel; during a next base station transmit time slot, transmitting at least a portion of the determined channel equalization factors to the mobile station, along with communication information; receiving the transmitted portion of the channel equalization factors and the communication information with the mobile station; and using the received channel equalization factors to equalize, in the mobile station, the received communication information in accordance with the current radio frequency propagation characteristic of the communication channel.
Claim 17
Dependent Claim
39 words
A method as set forth in claim 13 wherein the base station determines equalization factors having a feedforward component and a feedback component, and wherein only the feedback component is transmitted to the mobile station along with communication information.
Claim 18
Dependent Claim
46 words
A method as set forth in claim 14 wherein the base station receive time slot and the next base station transmit time slot are spaced apart in time by an amount during which the radio frequency propagation characteristic of the communication channel does not significantly change.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-11-09 | 2002-05-11 | 2002-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-11-09 | 2006-05-11 | 2006-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-11-09 | 2010-05-11 | 2010-11-10 | $7700.00 | Window Closed / Lapsed |