US6545997B1
Expired / Lapsed
US
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Transmission method and transmission apparatus for transmitting signals on the basis of a OFDM/TDMA-system with pilot symbols
Assignee: Sony Deutschland GmbH
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Filing: 1999-02-19
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Granted: 2003-04-08
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Expires: 2019-02-19
Abstract
Abstract The present invention relates to a transmission method and a transmission apparatus for transmitting signals on the basis of a OFDM/TDMA-system, wherein a plurality of subcarriers being orthogonal to each other are allocated to a variable number of channels, each channel containing a variable number of subcarriers depending on information to be transmitted in said signals, wherein, for the transmission of said signals in a GSM-system having a constant number of predetermined GSM-frequency channels and a constant number of predetermined GSM-timeslots being grouped in GSM-frames, the number of said subcarriers is allocated corresponding to the bandwidth of said GSM-frequency channels, so that a multiple of one resulting OFDM/TDMA-timeslot matches with one or a multiple of one GSM-timeslots, wherein a pilot symbol is allocated to every n-th subcarrier in said GSM-frequency-channels, whereby n is an integer and>1, and wherein said signals are transmitted. The present invention also proposes a receiving method and a receiving apparatus for receiving corresponding signals. Thereby, a reliable channel estimate and equalization can be performed.
Inventors
- 👤 Ralf Böhnke
- 👤 Seiichi Izumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:34
CPC Classifications
H; H04; H04J; H04J11/00; H04L; H04L5/00; H04L5/02; H04L5/023
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
147 words
A transmission apparatus for transmitting signals on the basis of an OFDM/TDMA-system, comprising: allocation means for allocating a plurality of subcarriers being orthogonal to each other to a variable number of channels (U 0 , U 1 . . . U 9 ), each channel containing a variable number of subcarriers depending on information to be transmitted in said signals, wherein said allocation means, for the transmission of said signals in a GSM-system having a constant number of predetermined GSM-frequency-channels and a constant number of predetermined GSM-timeslots being grouped in GSM-frames, allocates a number of said subcarriers corresponding to the bandwidth of said GSM-frequency-channels, so that a multiple of one resulting OFDM/TDMA-timeslot (T S ) matches with one or a multiple of one GSM-timeslot, and for allocating a pilot symbol to every n-th subcarrier, n being an integer and n>1, and transmission means for transmitting said signals.
Claim 2
Dependent Claim
147 words
A transmission apparatus for transmitting signals on the basis of an OFDM/TDMA-system, comprising: allocation means for allocating a plurality of subcarriers being orthogonal to each other to a variable number of channels (U 0 , U 1 . . . U 9 ), each channel containing a variable number of subcarriers depending on information to be transmitted in said signals, wherein said allocation means, for the transmission of said signals in a GSM-system having a constant number of predetermined GSM-frequency-channels and a constant number of predetermined GSM-timeslots being grouped in GSM-frames, allocates a number of said subcarriers corresponding to the bandwidth of said GSM-frequency-channels, so that a multiple of one resulting OFDM/TDMA-timeslot (T S ) matches with one or a multiple of one GSM-timeslot, and for allocating a pilot symbol to every n-th subcarrier, n being an integer and n>1, and transmission means for transmitting said signals.
Claim 3
Dependent Claim
42 words
The transmission method according to claim 1 , characterized by, said allocation means, in case a multiple of one resulting OFDM/TDMA-timeslot (T S ) matches with one GSM-timeslot, the pilot symbols in adjacent OFDM/TDMA-timeslots are frequency interlaced with respect to each other.
Claim 4
Dependent Claim
45 words
The transmission method according to claim 2 , characterized by, in said allocation means, the pilot symbols in adjacent OFDM/TDMA-timeslots are symmetrically interlaced, whereby one pilot symbol is allocated to a subcarrier in the frequency middle between two respective pilot symbols of an adjacent OFDM/TDMA-timeslot.
Claim 5
Dependent Claim
41 words
The transmission method according to claim 1 , characterized in that, in said allocation means, 48 of said subcarriers are allocated corresponding to the bandwidth of said GSM-frequency channels, so that 2 OFDM/TDMA-timeslots match with 1 GSM-timeslot, whereby n=6 or n=8.
Claim 6
Dependent Claim
142 words
A transmission method for transmitting signals on the basis of an OFDM/TDMA-system, comprising the steps of: allocating a plurality of subcarriers being orthogonal to each other to a variable number of channels U 0 , U 1 . . . U 9 , each channel containing a variable number of subcarriers depending on information to be transmitted in said signals, wherein, for the transmission of said signals in a GSM-system having a constant number of predetermined GSM-frequency-channels and a constant number of predetermined GSM-timeslots being grouped in GSM-frames, a number of said subcarriers is allocated corresponding to the bandwidth of said GSM-frequency-channels, so that a multiple of one resulting OFDM/TDMA-timeslot (T S ) matches with one or a multiple of one GSM-timeslot, wherein a pilot symbol is allocated to every n-th subcarrier, n being an integer and n>1, and transmitting said signals.
Claim 7
Dependent Claim
142 words
A transmission method for transmitting signals on the basis of an OFDM/TDMA-system, comprising the steps of: allocating a plurality of subcarriers being orthogonal to each other to a variable number of channels U 0 , U 1 . . . U 9 , each channel containing a variable number of subcarriers depending on information to be transmitted in said signals, wherein, for the transmission of said signals in a GSM-system having a constant number of predetermined GSM-frequency-channels and a constant number of predetermined GSM-timeslots being grouped in GSM-frames, a number of said subcarriers is allocated corresponding to the bandwidth of said GSM-frequency-channels, so that a multiple of one resulting OFDM/TDMA-timeslot (T S ) matches with one or a multiple of one GSM-timeslot, wherein a pilot symbol is allocated to every n-th subcarrier, n being an integer and n>1, and transmitting said signals.
Claim 8
Dependent Claim
39 words
The transmission method according to claim 5 , characterized in that if a multiple of one resulting OFDM/TDMA-timeslot (T S ) matches with one GSM-timeslot, the pilot symbols in adjacent OFDM/TDMA-timeslots are frequency interlaced with respect to each other.
Claim 9
Dependent Claim
42 words
The transmission method according to claim 6 , characterized in that the pilot symbols in adjacent OFDM/TDMA-timeslots are symmetrically interlaced, whereby one pilot symbol is allocated to a subcarrier in the frequency middle between two respective pilot symbols of an adjacent OFDM/TDMA-timeslot.
Claim 10
Dependent Claim
37 words
The transmission method according to claim 5 , characterized in that 48 of said subcarriers are allocated corresponding to the bandwidth of said GSM-frequency channels, so that 2 OFDM/TDMA-timeslots match with 1 GSM-timeslot, whereby n=6 or n=8.
Claim 11
Dependent Claim
56 words
A receiving method for receiving signals transmitted by means of a transmission method according to claim 5 , characterized by the steps of: receiving the transmitted signals, estimating a channel transfer function on the basis of the received pilot symbols, and equalizing data symbols transmitted in said signals on the basis of the estimated transfer function.
Claim 12
Dependent Claim
36 words
The receiving method according to claim 9 , characterized in that said estimating step, a time and/or frequency interpolation on the basis of the received pilot symbols is performed to generate said estimated channel transfer function.
Claim 13
Dependent Claim
19 words
The receiving method according to claim 9 , characterized in that said channel transfer function is the channel attenuation.
Claim 14
Dependent Claim
65 words
A receiving apparatus for receiving signals transmitted by means of a transmission method according to claim 5 , characterized by: a receiving means for receiving the transmitted signals, an estimation means for estimating a channel transfer function on the basis of the received pilot symbols, and an equalization means for equalizing data symbols transmitted in said signals on the basis of the estimated transfer function.
Claim 15
Dependent Claim
35 words
The receiving apparatus according to claim 12 , characterized in that said estimation means performs a time and/or frequency interpolation on the basis of the received pilot symbols to generate said estimated channel transfer function.
Claim 16
Dependent Claim
19 words
The receiving method according to claim 12 , characterized in that said channel transfer function is the channel attenuation.
Claim 17
Dependent Claim
22 words
An OFDM/TDMA system comprising at least one transmission apparatus according to claim 5 and a receiving apparatus according to claim 12 .
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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) | 2006-04-07 | 2006-10-07 | 2007-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-04-07 | 2010-10-07 | 2011-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-04-07 | 2014-10-07 | 2015-04-08 | $7700.00 | Window Closed / Lapsed |