CA2629675A1 - Multi-stage receiver for wireless communication - Google Patents
Multi-stage receiver for wireless communication Download PDFInfo
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- CA2629675A1 CA2629675A1 CA002629675A CA2629675A CA2629675A1 CA 2629675 A1 CA2629675 A1 CA 2629675A1 CA 002629675 A CA002629675 A CA 002629675A CA 2629675 A CA2629675 A CA 2629675A CA 2629675 A1 CA2629675 A1 CA 2629675A1
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- data
- processor
- end filter
- combiner
- signal components
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/7103—Interference-related aspects the interference being multiple access interference
- H04B1/7105—Joint detection techniques, e.g. linear detectors
- H04B1/71057—Joint detection techniques, e.g. linear detectors using maximum-likelihood sequence estimation [MLSE]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
- H04L25/03019—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/02—Channels characterised by the type of signal
- H04L5/023—Multiplexing of multicarrier modulation signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/711—Interference-related aspects the interference being multi-path interference
- H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
- H04B1/7117—Selection, re-selection, allocation or re-allocation of paths to fingers, e.g. timing offset control of allocated fingers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/711—Interference-related aspects the interference being multi-path interference
- H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
- H04B1/712—Weighting of fingers for combining, e.g. amplitude control or phase rotation using an inner loop
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
- H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
- H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
- H04B2201/70701—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation featuring pilot assisted reception
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
- H04L2025/03426—Arrangements for removing intersymbol interference characterised by the type of transmission transmission using multiple-input and multiple-output channels
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0226—Channel estimation using sounding signals sounding signals per se
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Power Engineering (AREA)
- Radio Transmission System (AREA)
- Mobile Radio Communication Systems (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
Techniques for receiving a MIMO transmission are described. A receiver processes received data from multiple receive antennas in multiple stages. A
first stage performs front-end filtering/equalization on the received data with a front-end filter to process non on-time signal components in the multiple received signals. A second stage processes the filtered data with one or more combiner matrices to combine on-time signal components for multiple transmitted signals. For a MIMO-CDM transmission, a single front-end filter may be used for all channelization codes, and a different combiner matrix may be used for each channelization code. Partitioning the receiver processing into multiple stages simplifies derivation of the front-end filter and combiner matrices while achieving good performance. The front-end filter and combiner matrices may be updated separately at the same or different rates.
first stage performs front-end filtering/equalization on the received data with a front-end filter to process non on-time signal components in the multiple received signals. A second stage processes the filtered data with one or more combiner matrices to combine on-time signal components for multiple transmitted signals. For a MIMO-CDM transmission, a single front-end filter may be used for all channelization codes, and a different combiner matrix may be used for each channelization code. Partitioning the receiver processing into multiple stages simplifies derivation of the front-end filter and combiner matrices while achieving good performance. The front-end filter and combiner matrices may be updated separately at the same or different rates.
Claims (40)
1. An apparatus comprising:
at least one processor to filter received data to process non on-time signal components in multiple received signals and to obtain filtered data, and to process the filtered data to combine on-time signal components for multiple transmitted signals; and a memory coupled to the at least one processor.
at least one processor to filter received data to process non on-time signal components in multiple received signals and to obtain filtered data, and to process the filtered data to combine on-time signal components for multiple transmitted signals; and a memory coupled to the at least one processor.
2. The apparatus of claim 1, wherein the at least one processor filters the received data for more than one symbol period to process the non on-time signal components, and processes the filtered data for one symbol period to combine the on-time signal components.
3. The apparatus of claim 1, wherein the at least one processor filters the received data in time domain.
4. The apparatus of claim 1, wherein the at least one processor derives a front-end filter for processing the non on-time signal components and derives at least one combiner matrix for combining the on-time signal components.
5. The apparatus of claim 4, wherein the at least one processor derives the front-end filter based on received data for pilot and derives the at least one combiner matrix based on at least one transmit matrix used to send data in the multiple transmitted signals.
6. The apparatus of claim 1, wherein the at least one processor derives a front-end filter for processing the non on-time signal components and derives multiple combiner matrices for combining the on-time signal components for multiple channelization codes used for the multiple transmitted signals.
7. The apparatus of claim 6, wherein the at least one processor filters the received data with the front-end filter and processes the filtered data with the multiple combiner matrices to obtain output data for the multiple channelization codes.
8. The apparatus of claim 6, wherein the at least one processor filters the received data with the front-end filter to obtain intermediate data, despreads the intermediate data for each of the multiple channelization codes to obtain filtered data for the channelization code, and processes the filtered data for each channelization code with a combiner matrix for the channelization code to obtain output data for the channelization code.
9. The apparatus of claim 6, wherein the at least one processor despreads the received data for each of the multiple channelization codes to obtain despread data for the channelization code, processes the despread data for each channelization code with the front-end filter to obtain filtered data for the channelization code, and processes the filtered data for each channelization code with a combiner matrix for the channelization code to obtain output data for the channelization code.
10. The apparatus of claim 6, wherein the at least one processor derives the front-end filter based on the received data and known pilot.
11. The apparatus of claim 6, wherein the at least one processor derives the front-end filter based on samples for the received data and known pilot chips.
12. The apparatus of claim 6, wherein the at least one processor despreads the received data with a pilot channelization code to obtain despread pilot symbols, and derives the front-end filter based on the despread pilot symbols and known pilot symbols.
13. The apparatus of claim 6, wherein the at least one processor derives the front-end filter based on least squares criterion.
14. The apparatus of claim 6, wherein the at least one processor derives the multiple combiner matrices based on multiple transmit matrices used for the multiple channelization codes.
15. The apparatus of claim 14, wherein the at least one processor derives the multiple combiner matrices further based on gains for the multiple channelization codes.
16. The apparatus of claim 14, wherein the at least one processor derives the multiple combiner matrices further based on a channel response estimate and the front-end filter.
17. The apparatus of claim 14, wherein the at least one processor derives the multiple combiner matrices based on minimum mean square error (MMSE) criterion.
18. The apparatus of claim 6, wherein the at least one processor derives a combiner matrix for each channelization code based on a noise covariance matrix, the front-end filter, a channel response estimate, and a transmit matrix for the channelization code.
19. The apparatus of claim 6, wherein the at least one processor derives a correlation matrix based on the filtered data and derives a combiner matrix for each channelization code based on the correlation matrix, the front-end filter, a channel estimate, and a transmit matrix for the channelization code.
20. The apparatus of claim 6, wherein the at least one processor updates the front-end filter at a first update rate and updates the multiple combiner matrices at a second update rate different from the first update rate.
21. The apparatus of claim 1, wherein the at least one processor derives a front-end filter based on pilot received in a first time interval, derives a combiner matrix for a second time interval based on a transmit matrix used in the second time interval, filters received data for the second time interval with the front-end filter to obtain filtered data for the second time interval, and processes the filtered data with the combiner matrix.
22. The apparatus of claim 1, wherein the at least one processor estimates received signal quality for at least one data signal sent in the multiple transmitted signals.
23. An apparatus comprising:
at least one processor to derive a front-end filter for processing non on-time signal components in multiple received signals, to derive multiple combiner matrices for combining on-time signal components for multiple transmitted signals sent with multiple channelization codes, to filter received samples with the front-end filter and obtain filtered symbols for the multiple channelization codes, and to process filtered symbols for each of the multiple channelization codes with a combiner matrix for the channelization code to obtain output symbols for the channelization code; and a memory coupled to the at least one processor.
at least one processor to derive a front-end filter for processing non on-time signal components in multiple received signals, to derive multiple combiner matrices for combining on-time signal components for multiple transmitted signals sent with multiple channelization codes, to filter received samples with the front-end filter and obtain filtered symbols for the multiple channelization codes, and to process filtered symbols for each of the multiple channelization codes with a combiner matrix for the channelization code to obtain output symbols for the channelization code; and a memory coupled to the at least one processor.
24. The apparatus of claim 23, wherein the at least one processor derives the front-end filter based on the received samples and known pilot chips.
25. The apparatus of claim 23, wherein the at least one processor derives a combiner matrix for each channelization code based on a transmit matrix used for the channelization code.
26. A method comprising:
filtering received data to process non on-time signal components in multiple received signals and obtain filtered data; and processing the filtered data to combine on-time signal components for multiple transmitted signals.
filtering received data to process non on-time signal components in multiple received signals and obtain filtered data; and processing the filtered data to combine on-time signal components for multiple transmitted signals.
27. The method of claim 26, further comprising:
deriving a front-end filter for processing the non on-time signal components;
and deriving at least one combiner matrix for combining the on-time signal components.
deriving a front-end filter for processing the non on-time signal components;
and deriving at least one combiner matrix for combining the on-time signal components.
28. The method of claim 26, further comprising:
deriving a front-end filter for processing the non on-time signal components;
and deriving multiple combiner matrices for combining the on-time signal components for multiple channelization codes used for the multiple transmitted signals.
deriving a front-end filter for processing the non on-time signal components;
and deriving multiple combiner matrices for combining the on-time signal components for multiple channelization codes used for the multiple transmitted signals.
29. The method of claim 28, wherein the filtering the received data comprises filtering the received data with the front-end filter to obtain intermediate data, and despreading the intermediate data for each of the multiple channelization codes to obtain filtered data for the channelization code, and wherein the processing the filtered data comprises processing the filtered data for each channelization code with a combiner matrix for the channelization code to obtain output data for the channelization code.
30. The method of claim 28, wherein the deriving the front-end filter comprises deriving the front-end filter based on samples for the received data and known pilot chips.
31. The method of claim 28, wherein the deriving the multiple combiner matrices comprises deriving a combiner matrix for each of the multiple channelization codes based on a transmit matrix used for the channelization code.
32. An apparatus comprising:
means for filtering received data to process non on-time signal components in multiple received signals and obtain filtered data; and means for processing the filtered data to combine on-time signal components for multiple transmitted signals.
means for filtering received data to process non on-time signal components in multiple received signals and obtain filtered data; and means for processing the filtered data to combine on-time signal components for multiple transmitted signals.
33. The apparatus of claim 32, further comprising:
means for deriving a front-end filter for processing the non on-time signal components; and means for deriving multiple combiner matrices for combining the on-time signal components for multiple channelization codes used for the multiple transmitted signals.
means for deriving a front-end filter for processing the non on-time signal components; and means for deriving multiple combiner matrices for combining the on-time signal components for multiple channelization codes used for the multiple transmitted signals.
34. The apparatus of claim 33, wherein the means for filtering the received data comprises means for filtering the received data with the front-end filter to obtain intermediate data, and means for despreading the intermediate data for each of the multiple channelization codes to obtain filtered data for the channelization code, and wherein the means for processing the filtered data comprises means for processing the filtered data for each channelization code with a combiner matrix for the channelization code to obtain output data for the channelization code.
35. The apparatus of claim 33, wherein the means for deriving the front-end filter comprises means for deriving the front-end filter based on samples for the received data and known pilot chips, and wherein the means for deriving the multiple combiner matrices comprises means for deriving a combiner matrix for each of the multiple channelization codes based on a transmit matrix used for the channelization code.
36. A processor readable media for storing instructions operable to:
filter received data to process non on-time signal components in multiple received signals and obtain filtered data; and process the filtered data to combine on-time signal components for multiple transmitted signals.
filter received data to process non on-time signal components in multiple received signals and obtain filtered data; and process the filtered data to combine on-time signal components for multiple transmitted signals.
37. An apparatus comprising:
at least one processor to perform processing for non on-time signal components in multiple received signals to obtain received symbols, to derive a combiner matrix for combining on-time signal components for multiple transmitted signals sent on a subcarrier, and to process received symbols for the subcarrier with the combiner matrix to obtain output symbols for the subcarrier; and a memory coupled to the at least one processor.
at least one processor to perform processing for non on-time signal components in multiple received signals to obtain received symbols, to derive a combiner matrix for combining on-time signal components for multiple transmitted signals sent on a subcarrier, and to process received symbols for the subcarrier with the combiner matrix to obtain output symbols for the subcarrier; and a memory coupled to the at least one processor.
38. The apparatus of claim 37, wherein the at least one processor performs processing for the non on-time signal components by removing cyclic prefix and performing a fast Fourier transform (FFT) on received samples to obtain the received symbols.
39. The apparatus of claim 37, wherein the at least one processor derives the combiner matrix based on at least one of a noise covariance matrix, a channel response estimate, and a transmit matrix for the subcarrier.
40. The apparatus of claim 37, wherein the at least one processor derives a second combiner matrix for combining on-time signal components for multiple transmitted signals sent on a second subcarrier, and processes received symbols for the second subcarrier with the second combiner matrix to obtain output symbols for the second subcarrier.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US74115905P | 2005-11-30 | 2005-11-30 | |
| US60/741,159 | 2005-11-30 | ||
| US11/564,261 US8107549B2 (en) | 2005-11-30 | 2006-11-28 | Multi-stage receiver for wireless communication |
| US11/564,261 | 2006-11-28 | ||
| PCT/US2006/061440 WO2007111718A2 (en) | 2005-11-30 | 2006-11-30 | Multi-stage receiver for wireless communication |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2629675A1 true CA2629675A1 (en) | 2007-10-04 |
| CA2629675C CA2629675C (en) | 2012-07-10 |
Family
ID=38428164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2629675A Expired - Fee Related CA2629675C (en) | 2005-11-30 | 2006-11-30 | Multi-stage receiver for wireless communication |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US8107549B2 (en) |
| EP (1) | EP1955444A2 (en) |
| JP (1) | JP5180093B2 (en) |
| KR (1) | KR101084013B1 (en) |
| BR (1) | BRPI0619175A2 (en) |
| CA (1) | CA2629675C (en) |
| RU (1) | RU2404508C2 (en) |
| WO (1) | WO2007111718A2 (en) |
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2006
- 2006-11-28 US US11/564,261 patent/US8107549B2/en not_active Expired - Fee Related
- 2006-11-30 JP JP2008543583A patent/JP5180093B2/en not_active Expired - Fee Related
- 2006-11-30 CA CA2629675A patent/CA2629675C/en not_active Expired - Fee Related
- 2006-11-30 KR KR1020087015945A patent/KR101084013B1/en active IP Right Grant
- 2006-11-30 EP EP06850216A patent/EP1955444A2/en not_active Withdrawn
- 2006-11-30 BR BRPI0619175-4A patent/BRPI0619175A2/en not_active Application Discontinuation
- 2006-11-30 WO PCT/US2006/061440 patent/WO2007111718A2/en active Application Filing
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Also Published As
| Publication number | Publication date |
|---|---|
| KR20080079665A (en) | 2008-09-01 |
| RU2404508C2 (en) | 2010-11-20 |
| CA2629675C (en) | 2012-07-10 |
| JP5180093B2 (en) | 2013-04-10 |
| WO2007111718A3 (en) | 2008-01-24 |
| US20070195865A1 (en) | 2007-08-23 |
| RU2008126215A (en) | 2010-01-10 |
| BRPI0619175A2 (en) | 2011-09-20 |
| KR101084013B1 (en) | 2011-11-16 |
| WO2007111718A2 (en) | 2007-10-04 |
| JP2009518894A (en) | 2009-05-07 |
| US8107549B2 (en) | 2012-01-31 |
| EP1955444A2 (en) | 2008-08-13 |
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