EP1966919A2 - Communication system and method - Google Patents

Communication system and method

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Publication number
EP1966919A2
EP1966919A2 EP06711343A EP06711343A EP1966919A2 EP 1966919 A2 EP1966919 A2 EP 1966919A2 EP 06711343 A EP06711343 A EP 06711343A EP 06711343 A EP06711343 A EP 06711343A EP 1966919 A2 EP1966919 A2 EP 1966919A2
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EP
European Patent Office
Prior art keywords
parameter
scattered
transmission
bit
burst
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EP06711343A
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German (de)
French (fr)
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EP1966919A4 (en
Inventor
Zion Hadad
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Individual
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Individual
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Publication of EP1966919A2 publication Critical patent/EP1966919A2/en
Publication of EP1966919A4 publication Critical patent/EP1966919A4/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J4/00—Combined time-division and frequency-division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
    • 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
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J7/00—Multiplex systems in which the amplitudes or durations of the signals in individual channels are characteristic of those channels

Definitions

  • This invention relates to communication systems and methods, and more particularly to such systems and methods using FEC blocks.
  • the OFDMA PHY uses a two-dimensional allocation method (in the frequency and the time domains) in order to allocate slots for transmission.
  • FIG. 1 An example for a possible transmission frame can be seen in Fig. 1, wherein different bursts in the DL are shown in different shades of gray. The same method may be used in the UL as well.
  • Each burst may contain several FEC blocks; a FEC block is the basic entity, which is processed, in the encoding chain.
  • a possible encoding chain using the convolutional encoder, uses a bit Interleaver as one of the chain processing elements or any other FEC encoding needs Interleaver which may appear in the byte level or/and symbol level or/and bit level as for example we have in DVB-T.
  • bit Interleaver definition is given in the standard and follows the following definitions, for example 802.16d OFDMA: — P 1 —
  • All encoded data bits shall be interleaved by a block interleaver with a block size corresponding to the number of coded bits per the encoded block size N cbps as set in 8.4.9.2.
  • the interleaver is defined by a two-step permutation. The first ensures that adjacent coded bits are mapped onto nonadjacent subcarriers. The second permutation insures that adjacent coded bits are mapped alternately onto less or more significant bits of the constellation, thus avoiding long runs of lowly reliable bits.
  • N cpc be the number of coded bits per subcarrier, i.e., 2, 4 or 6 for QPSK, 16-QAM or 64-QAM, respectively.
  • s N cpc /2.
  • k be the index of the coded bit before the first permutation
  • m k bethe index of that coded bit after the first and before the second permutation
  • lety' k be the index after the second permutation, just prior to modulation mapping
  • d be the modulo used for the permutation.
  • the second permutation is defined by the formula:
  • the de-intef leaver which performs the inverse operation, is also defined by two permutations, within a received block of N ebfS bits, let/ be the index of a received bit before the first permutation: rri j be the index of that bit after the first and before the second permutation; and let A / be the index of that bit after the second permutation, just prior to delivering the block to the decoder.
  • the first permutation is defined by the formula:
  • the second permutation is defined by the formula:
  • the first permutation in the de-interleaver is the inverse of the second permutation in the interleaver, and conversely.
  • This Interleaver and the OFDMA permutations in the different modes such as PUSC, FUSC, OFUSC, AMC - these are different ways to scatter or/and grouping of the subcarriers in time or/and in frequency in the transmitted frame) can be improve the results with a very small minimal distance between the interleaved bits .
  • Figs. 1 - 4 illustrate an example for a possible transmission frame
  • FIG. 5 - 7 detail, in table format, data to be used in preferred embodiments of the invention
  • FIG. 8 - 10 detail methods for implementing the invention - S -
  • Figs. 1 - 2 illustrate an example for a possible transmission frame. Different bursts in the DL are shown in different shades of gray or are enclosed within rectangles therein.
  • a bi-dimensional transmission is detailed in the time/frequency space, with frequency axis 11 indicating subchannels, and time axis including the stages downlink (DL) 12 and uplink (UL) 13.
  • the frame includes a preamble 21, DL and UL map 22, bursts 23, 24, 25, 26, 27 and 28.
  • Table 1 (Fig. 5) illustrates examples of embodiments of the present invention, wherein the parameter d is devised as a result of manipulating the "d" parameter of the formula per modulation and encoded block.
  • the Table shows such an example that apply to the current 802.16d ( 2004 ) for the "d" parameter, this optimization results in a high minimal-distance between the interleaved bits, and an improved performance of the link.
  • This extra optimization per FEC block will improve the system in case of burst errors which hit part of the FEC block that may caused by other cell, sectors interferers or by separate or combination of frequency/time fading which may create a frequency selective fading (holes) which are moving in time relative to the Doppler caused by the speed of the mobile or any other reasons .
  • This Multi-parameter d or any scattered spread parameter can be applied to another level , for example for symbol , byte and bit interleaves which may optimize for different FEC method like block code RS, TPC, LDPC etc., or covolutional codes like CC, CTC etc.
  • An improvement in the above invention may include a closed loop method: When mobile or fixed user detects that the scattered parameter are not good for the location of the scattered subcarrier hits by interference that randomly hit sequence of adjacent bits in the block code that reduce the code capability, the Mobile when detect this situation can ask the base for a parameter change which will break the sequence.
  • any repetition code, ARQ code or HARQ may change the scattered parameter by selecting for each transmission a different set of scattered parameters, which effectively will give the new system and method desirable frequency hopping and time hopping results in two level of diversity.
  • the OFDMA PHY defined: For example, within the IEEE802.16d/e standard and DVB-RCT ETSI standard uses a two-dimensional allocation method (in the frequency and the time domains) in order to allocate slots for transmission, an example for a possible transmission frame can be seen in Figs. 3 - 4.
  • a bi-dimensional transmission is detailed in the time/frequency space, with frequency axis 11 indicating subchannels, and time axis including the stages downlink (DL) 12 and uplink (UL) 13.
  • the frame includes a preamble 21, DL and UL map 22, bursts 23, 24, 25, 26, 27 and 28.
  • Each burst may contain several FEC blocks; a FEC block is the basic entity, which is processed, in the encoding chain.
  • a possible encoding chain using the convolutional encoder, uses a bit Interleaver as one of the chain processing elements or any other FEC encoding needs Interleaver which may appear in the byte level or/and symbol level or/and bit level as, for example, we have in DVB-T.
  • bit Interleaver definition is given in the standard and follows the following definitions for example 802.16d OFDKIA as detailed above.
  • the invention may be used in a system such as CDMA, SC, OFDM, OFDMA, etc.
  • parameter d used for all blocks
  • the bit Interleaver may use more than one constant parameter (named "d", and it equals for example 16 in 802.16), in order to perform its inner permutations.
  • the present invention implements this new innovative concept by manipulating the "d" parameter of the formula per modulation and encoded block, the following table shows such an example that apply to the current 802.16d (2004) for the "d" parameter.
  • Yet another method will be to optimize each transmission type (depending on the mode used, modulation, and number of slots) with its own unique parameter achieving optimal performance for each transmission' type.
  • This extra optimization per FEC block will improve the system in case of burst errors which hit part of the FEC block that may caused by other cell, sectors interferers or by separate or combination of frequency/time fading which may create a frequency selective fading (holes) which are moving in time relative to the Doppler caused by the speed of the mobile or any other reasons .
  • This Multi-parameter d or any scattered spread parameter can be applied to other level like symbol, byte and bit interleaves which may optimize for different FEC method like block code RS, TPC, LDPC etc. or covolutional codes like CC, CTC etc.
  • the method includes ( See Fig . 8 ) :
  • An improvement for the above invention could be close loop method when mobile or fixed user detects that the scattered parameter are not good for the location of the scattered subcarrier hits by interference that randomly hit sequence of adjacent bits in the block code that reduce the code capability.
  • the Mobile when detect this situation can ask the base for parameter change which will break the sequence for example we can have two different d per FEC block.
  • the method includes (See Fig. 9):
  • the base may base answer, if possible, with a parameter change which will break the sequence.
  • any repetition code, ARQ code or HARQ may change the scattered parameter by selecting, for each transmission, a different set of scattered parameter ARQ can combined CL Scattering by incorporate scattered parameter number as part of the ARQ ACK/NACK which effectively will give us controlled close loop frequency hopping and time hopping results in two level of diversity.
  • the method includes (See Fig. 10):
  • OLL Open Loop
  • Yet another method will be to optimize each transmission type (depending on the mode used, modulation and transmission slot format) with its own unique parameter, achieving optimal performance for each transmission type.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Error Detection And Correction (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

In a system (41) like CDMA, SC, OFDM, OFDMA, etc., a method is disclosed for computing and using the parameter d (42) for all blocks. The Bit Interleaver uses a constant parameter (named 'd', and it equals for example 16 in 802.16), in order to perform its inn permutations. Improved performance is achieved by manipulating the 'd' parameter of the formula per modulation and encoded bloc (43), using data from a table. An example applicable with the current 802.16d (2004) for the 'd' parameter is also disclosed (44).

Description

Communication system and method
The present application Priority: application No. 167677 filed on 25 March 2005 in Israel and entitled "Communication system and method " .
Technical Field
This invention relates to communication systems and methods, and more particularly to such systems and methods using FEC blocks.
Background of the Invention
The OFDMA PHY, as defined for example within the IEEE802.16d/e standard and DVB-RCT ETSI standard, uses a two-dimensional allocation method (in the frequency and the time domains) in order to allocate slots for transmission.
An example for a possible transmission frame can be seen in Fig. 1, wherein different bursts in the DL are shown in different shades of gray. The same method may be used in the UL as well.
Each burst may contain several FEC blocks; a FEC block is the basic entity, which is processed, in the encoding chain.
In the definition of the OFDMA, a possible encoding chain, using the convolutional encoder, uses a bit Interleaver as one of the chain processing elements or any other FEC encoding needs Interleaver which may appear in the byte level or/and symbol level or/and bit level as for example we have in DVB-T.
The bit Interleaver definition is given in the standard and follows the following definitions, for example 802.16d OFDMA: — P 1 —
All encoded data bits shall be interleaved by a block interleaver with a block size corresponding to the number of coded bits per the encoded block size Ncbps as set in 8.4.9.2. The interleaver is defined by a two-step permutation. The first ensures that adjacent coded bits are mapped onto nonadjacent subcarriers. The second permutation insures that adjacent coded bits are mapped alternately onto less or more significant bits of the constellation, thus avoiding long runs of lowly reliable bits.
Let Ncpcbe the number of coded bits per subcarrier, i.e., 2, 4 or 6 for QPSK, 16-QAM or 64-QAM, respectively. Let s = Ncpc/2. Within a block of Ncbps bits at transmission, let k be the index of the coded bit before the first permutation , mkbethe index of that coded bit after the first and before the second permutation and lety'kbe the index after the second permutation, just prior to modulation mapping, and d be the modulo used for the permutation.
The first permutation is defined by the formula: k = 0,l,...,Ncbps- 1 , d = 16
Wk= (Ncbps/fiO ' ^mod(d) + floored)
£ = 0,l,..., Ncbps-l d=16 (126)
The second permutation is defined by the formula:
Λ = s ' f]oJτnι/s) + (mk + Nchps -floor(d . mk/ Ncbps))moά(s)
A; = 0,l,..., Ncbps-l d=16 (127) The de-intef leaver, which performs the inverse operation, is also defined by two permutations, within a received block of NebfS bits, let/ be the index of a received bit before the first permutation: rrij be the index of that bit after the first and before the second permutation; and let A/ be the index of that bit after the second permutation, just prior to delivering the block to the decoder.
The first permutation is defined by the formula:
mj = s -fioJj/s) + (J / = 0,l,..., Ncbps-l d=16 (128)
The second permutation is defined by the formula:
kj πij I Ncbps) / = 0,l,..., Ncbps-l d=16 (129)
The first permutation in the de-interleaver is the inverse of the second permutation in the interleaver, and conversely.
Summary of the Invention
The various terms used in the present disclosure, such as FEC, OFDMA PHY, DVB-RCT ETSI, PUSC, FUSC, OFUSC, AMC are known in the art and are defined in various communication standards, such as the IEEE802.16d/e standard.
In a system like CDMA, SC, OFDM, OFDMA, etc., until now it was used one parameter d for all blocks, and the Bit Interleaver used a constant parameter (named "d" , and it equals for example 16 in 802.16), in order to perform its inner permutations.
The combination of this Interleaver and the OFDMA permutations in the different modes such as PUSC, FUSC, OFUSC, AMC - these are different ways to scatter or/and grouping of the subcarriers in time or/and in frequency in the transmitted frame) can be improve the results with a very small minimal distance between the interleaved bits .
A solution to this problem is given by manipulating the "d" parameter of the formula per modulation and encoded block. The following tables show such examples that apply to the current 802.16d (2004) for the "d" parameter. This optimization results in a high minimal-distance between the interleaved bits, and an improved performance of the link. For example, improved resistance to interference may be achieved.
Further objects, advantages and other features of the present invention will become obvious to those skilled in the art upon reading the disclosure set forth hereinafter.
Brief Description of the Drawings
Figs. 1 - 4 illustrate an example for a possible transmission frame
Figs. 5 - 7 detail, in table format, data to be used in preferred embodiments of the invention
Figs. 8 - 10 detail methods for implementing the invention - S -
Detailed Description of the Invention
A preferred embodiment of the present invention will now be described by way of example and with reference to the accompanying drawing.
Figs. 1 - 2 illustrate an example for a possible transmission frame. Different bursts in the DL are shown in different shades of gray or are enclosed within rectangles therein.
A bi-dimensional transmission is detailed in the time/frequency space, with frequency axis 11 indicating subchannels, and time axis including the stages downlink (DL) 12 and uplink (UL) 13.
The frame includes a preamble 21, DL and UL map 22, bursts 23, 24, 25, 26, 27 and 28.
Table 1 (Fig. 5) illustrates examples of embodiments of the present invention, wherein the parameter d is devised as a result of manipulating the "d" parameter of the formula per modulation and encoded block.
The Table shows such an example that apply to the current 802.16d ( 2004 ) for the "d" parameter, this optimization results in a high minimal-distance between the interleaved bits, and an improved performance of the link.
This extra optimization per FEC block, will improve the system in case of burst errors which hit part of the FEC block that may caused by other cell, sectors interferers or by separate or combination of frequency/time fading which may create a frequency selective fading (holes) which are moving in time relative to the Doppler caused by the speed of the mobile or any other reasons .
This Multi-parameter d or any scattered spread parameter, can be applied to another level , for example for symbol , byte and bit interleaves which may optimize for different FEC method like block code RS, TPC, LDPC etc., or covolutional codes like CC, CTC etc. An improvement in the above invention may include a closed loop method: When mobile or fixed user detects that the scattered parameter are not good for the location of the scattered subcarrier hits by interference that randomly hit sequence of adjacent bits in the block code that reduce the code capability, the Mobile when detect this situation can ask the base for a parameter change which will break the sequence.
Of course, any repetition code, ARQ code or HARQ may change the scattered parameter by selecting for each transmission a different set of scattered parameters, which effectively will give the new system and method desirable frequency hopping and time hopping results in two level of diversity.
Interweavers in Multi-burst transmission
The OFDMA PHY defined: For example, within the IEEE802.16d/e standard and DVB-RCT ETSI standard uses a two-dimensional allocation method (in the frequency and the time domains) in order to allocate slots for transmission, an example for a possible transmission frame can be seen in Figs. 3 - 4.
A bi-dimensional transmission is detailed in the time/frequency space, with frequency axis 11 indicating subchannels, and time axis including the stages downlink (DL) 12 and uplink (UL) 13.
The frame includes a preamble 21, DL and UL map 22, bursts 23, 24, 25, 26, 27 and 28.
Different bursts in the DL are shown in different shades of gray, the same method may be used in the UL as well .
Each burst may contain several FEC blocks; a FEC block is the basic entity, which is processed, in the encoding chain. In the definition of the OFDBIA, a possible encoding chain, using the convolutional encoder, uses a bit Interleaver as one of the chain processing elements or any other FEC encoding needs Interleaver which may appear in the byte level or/and symbol level or/and bit level as, for example, we have in DVB-T.
The bit Interleaver definition is given in the standard and follows the following definitions for example 802.16d OFDKIA as detailed above.
The invention may be used in a system such as CDMA, SC, OFDM, OFDMA, etc. There may be variations in the parameter d used for all blocks, and The bit Interleaver may use more than one constant parameter (named "d", and it equals for example 16 in 802.16), in order to perform its inner permutations.
The combination of this Interleaver and the OFDMA permutations in the different modes (PUSC/FUSC/OFUSC/AMC- this are different ways to scatter or/and grouping of the subcarriers in time or/and in frequency in the transmitted frame) can be improve the results with a very small minimal distance between the interleaved bits.
The present invention implements this new innovative concept by manipulating the "d" parameter of the formula per modulation and encoded block, the following table shows such an example that apply to the current 802.16d (2004) for the "d" parameter.
This optimization results in a high minimal-distance between the interleaved bits, and an improved performance of the link (d is computed as 48*N, where N is the number of slots transmitted). See Table 2 (Fig. 6).
Other methods for optimizing the parameter d may be used. For example, other embodiments for optimizing d may use the following formulas :
d=12*N or
d=6*N
Yet another method will be to optimize each transmission type (depending on the mode used, modulation, and number of slots) with its own unique parameter achieving optimal performance for each transmission' type.
This extra optimization per FEC block, will improve the system in case of burst errors which hit part of the FEC block that may caused by other cell, sectors interferers or by separate or combination of frequency/time fading which may create a frequency selective fading (holes) which are moving in time relative to the Doppler caused by the speed of the mobile or any other reasons .
This Multi-parameter d or any scattered spread parameter can be applied to other level like symbol, byte and bit interleaves which may optimize for different FEC method like block code RS, TPC, LDPC etc. or covolutional codes like CC, CTC etc.
Method for transmission optimization
The method includes ( See Fig . 8 ) :
a. For each transmission type, receiving the mode used, modulation, and number of slots ; b. Setting a unique parameter for achieving optimal performance, for each transmission type; c. Applying the unique parameter for extra optimization per FEC block; d. Applying the MuIti-parameter d or any scattered spread parameter to other level like symbol, byte and bit interleaves.
End of method. Close Loop fCLl Scattering
An improvement for the above invention could be close loop method when mobile or fixed user detects that the scattered parameter are not good for the location of the scattered subcarrier hits by interference that randomly hit sequence of adjacent bits in the block code that reduce the code capability. The Mobile when detect this situation can ask the base for parameter change which will break the sequence for example we can have two different d per FEC block.
Method for Close Loop ["CL] Scattering
The method includes (See Fig. 9):
a. detecting or measuring (by a mobile or fixed user) whether the scattered parameter is or is not good for the location of the scattered subcarrier hits by interference that randomly hit sequence of adjacent bits in the block code that reduce the code capability; b. is the scattered parameter satisfactory? if yes then goto (a); c. asking (by the Mobile) the base for a parameter change which will break the sequence; d. answering (by the base), if possible, with a parameter change which will break the sequence; e. goto a. End of method.
The base may base answer, if possible, with a parameter change which will break the sequence.
For example, we can have two different d per FEC block. Repetition code and ARQ
Of course, any repetition code, ARQ code or HARQ may change the scattered parameter by selecting, for each transmission, a different set of scattered parameter ARQ can combined CL Scattering by incorporate scattered parameter number as part of the ARQ ACK/NACK which effectively will give us controlled close loop frequency hopping and time hopping results in two level of diversity.
So, in this way, a bit that may fall to a hole in one transmission may fall to a good location in the next transmission and incorporate combined algorithm like, selection, MRC etc., on the bit/symbol will give us good improvement. In case of simple repetition we can chose several different scattered parameters in advanced which will give us kind of Open Loop [OL] solution that is good for fast changing channel or interference.
Method for Repetition code and ARQ
The method includes (See Fig. 10):
a. Changing the scattered parameter for any repetition code, ARQ code or HARQ, by selecting, for each transmission, a different set of scattered parameter; b. incorporating with ARQ combined CL Scattering, a scattered parameter number as part of the ARQ ACK/NACK which effectively will give us controlled close loop frequency hopping and time hopping results in two levels of diversity; c. as a result, a bit that may fall to a hole in one transmission may fall to a good location in the next transmission and incorporate combined algorithm like, selection, MRC etc., on the bit/symbol will give a good improvement ; d. in case of a simple repetition, choosing several different scattered parameters in advanced, which will give a kind of Open Loop [OL] solution that is good for fast changing channel or interference.
End of method. Yet another method will be to optimize each transmission type (depending on the mode used, modulation and transmission slot format) with its own unique parameter, achieving optimal performance for each transmission type.
Yet another solution will be to optimize each block size for each modulation type as illustrated by way of example with reference to Table 3 (Fig. 7).
Various embodiments of the abovedetailed system and method may be devised, according to the structure and operation of the system as detailed in the present disclosure.
It will be recognized that the foregoing is but one example of an apparatus and method within the scope of the present invention, and that various modifications will occur to those skilled in the art upon reading the disclosure set forth hereinbefore.

Claims

ClaimsWhat is claimed is:
1. In a communication system using burst with FEC blocks, a method using, for each block, a possibly different value of a parameter d, wherein the parameter d is used to perform inner permutations .
2. The method according to claim 1, wherein the communication system is based on CDMA, SC, OFDM or OFDMA, or a combination thereof.
3. The method according to claim 1 , wherein the parameter d is used to perform inner permutations in a Bit Interleaver.
4. The method according to claim 1, wherein the parameter d is used to perform inner permutations in a Bit Deinterleaver.
5. The method according to claim 1 , wherein the parameter d is used to perform inner permutations in a Bit Interleaver and OFDMA permutations in the different modes PUSC, FUSC, OFUSC or AMC.
6. The method according to claim 1, wherein the parameter d is computed as d=12*N .
7. The method according to claim 1, wherein the parameter d is computed as d=6*N .
8. The method according to claim 1 , wherein the communication parameters are set as detailed in Table 1, 2 or 3.
9. In a communication system using burst with FEC blocks, a method for transmission optimization including: a. For each transmission type, receiving the mode used, modulation, and number of slots; b. Setting a unique parameter for achieving optimal performance, for each transmission type; c. Applying the unique parameter for extra optimization per FEC block; d. Applying the MuIti-parameter d or any scattered spread parameter to other level like symbol, byte and bit interleaves.
10. The method according to claim 9, wherein the parameter is parameter d used in Interweavers in Multi-burst transmission.
11. The method according to claim 9, wherein the communication parameters are set as detailed in Table 1, 2 or 3.
12. In a communication system using burst with FEC blocks, a method for Close Loop [CL] Scattering including: a. detecting or measuring (by a mobile or fixed user) whether the scattered parameter is or is not good for the location of the scattered subcarrier hits by interference that randomly hit sequence of adjacent bits in the block code that reduce the code capability; b. is the scattered parameter satisfactory? if yes then goto (a); c. asking (by the Mobile) the base for a parameter change which will break the sequence; d. answering (by the base), if possible, with a parameter change which will break the sequence; e. goto a.
13. The method according to claim 12, wherein the parameter is parameter d used in Interweavers in Multi-burst transmission.
14. The method according to claim 13 , wherein the communication uses two different values of the d parameter per FEC block. - IA -
15. The method according to claim 12 , wherein the communication parameters are set as detailed in Table I1 2 or 3.
16. In a communication system using burst with PEC blocks, a method for Repetition code and ARQ including: a. Changing the scattered parameter for any repetition code, ARQ code or HARQ, by selecting, for each transmission, a different set of scattered parameter; b. incorporating with ARQ combined CL Scattering, a scattered parameter number as part of the ARQ ACK/NACK which effectively will give us controlled close loop frequency hopping and time hopping results in two levels of diversity; c. as a result, a bit that may fall to a hole in one transmission may fall to a good location in the next transmission and incorporate combined algorithm like, selection, MRC etc. on the bit/symbol will give a good improvement; d. in case of a simple repetition, choosing several different scattered parameters in advanced, which will give a kind of Open Loop [OL] solution that is good for fast changing channel or interference.
17. The method according to claim 16, wherein the parameter is parameter d used in Interweavers in Multi-burst transmission.
18. The method according to claim 16, wherein the communication parameters are set as detailed in Table 1, 2 or 3.
EP06711343A 2005-03-25 2006-03-26 Communication system and method Withdrawn EP1966919A4 (en)

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IL16767705 2005-03-25
PCT/IL2006/000374 WO2006100683A2 (en) 2005-03-25 2006-03-26 Communication system and method

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WO2006100683A2 (en) 2006-09-28

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