CN101938777B - Special reference signal mapping method and device for downlink terminal in LET (Long Term Evolution) system - Google Patents
Special reference signal mapping method and device for downlink terminal in LET (Long Term Evolution) system Download PDFInfo
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Abstract
The invention discloses special reference signal mapping method and device for a downlink terminal in a LET (Long Term Evolution) system. The method comprises the steps of: detecting a channel environmental parameter; comparing the channel environmental parameter with a preset parameter; and mapping one path or two paths of reference signals to a physical resource block of the LTE system according to a comparison result. The invention can be used for mapping two paths of reference signals to one physical resource block of the LET system when the channel environment is preferable, thereby achieving the technical effect of reducing system resource cost.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for mapping a dedicated reference signal for a downlink terminal in a long term evolution system.
Background
In an intelligent antenna system, a base station antenna is usually an array antenna, and the communication system adopts a beam forming technology, namely, according to the spatial characteristics of signal transmission, the estimation of a forming weight vector or downlink beam forming is realized through spatial digital signal processing, so that the purposes of reducing interference, increasing capacity, expanding coverage, improving communication quality, reducing transmitting power and improving wireless data transmission rate are achieved.
In 3GPP LTE (3rd Generation Partnership Project Long term evolution) communication protocol, Downlink UE-specific Reference Signals (UE-specific Reference Signals) are adopted to support PDSCH (Physical Downlink Shared Channel) data transmission on a single antenna port (i.e., port 5) by using beamforming technology.
At present, only one group of UE-specific reference signals is defined in the communication protocol of the 3GPP LTE36 system, so that when the channel environment is better, the downlink terminal-specific reference signal mapping method in the long term evolution system in the related art also maps two paths of UE-specific reference signals to two physical resource blocks, which results in high system resource overhead.
Disclosure of Invention
The invention aims to provide a method and a device for mapping a downlink UE (user equipment) dedicated reference signal in an LTE (long term evolution) system, which can solve the technical problem of high system resource overhead in the related technology.
According to an aspect of the present invention, a method for mapping a downlink terminal dedicated reference signal in a long term evolution system is provided, including: detecting a channel environment parameter; comparing the channel environment parameters with preset parameters; and mapping one or two reference signals to a physical resource block of the long-term evolution system according to the comparison result.
According to another aspect of the present invention, there is also provided a downlink terminal dedicated reference signal mapping apparatus in a long term evolution system, including: the detection module is used for detecting the channel environment parameters; the comparison module is used for comparing the channel environment parameters with preset parameters; and the mapping module is used for mapping one or two reference signals to one physical resource block of the long-term evolution system according to the comparison result.
By means of at least one technical scheme of the invention, the channel environment is detected, and one or two reference signals are selected to be mapped to one physical resource block of the long-term evolution system according to the detection result, so that the two reference signals can be mapped to one physical resource block of the long-term evolution system when the channel environment is better, and the technical effect of reducing the system resource overhead is achieved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a flowchart of a data caching method for data traffic management according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of two reference signal locations for the method shown in FIG. 1;
FIG. 3 is another schematic diagram of two reference signal locations for the method of FIG. 1;
FIG. 4 is yet another schematic diagram of two reference signal locations for the method shown in FIG. 1;
FIG. 5 is yet another schematic diagram of two reference signal locations for the method shown in FIG. 1;
fig. 6 is a block diagram of a downlink terminal dedicated reference signal mapping apparatus in an LTE system according to a second embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It may be evident, however, that the present invention may be practiced without these specific details, and that various combinations of the details of the following examples and embodiments are possible without departing from the spirit and scope of the present invention as set forth in the appended claims.
First embodiment
Fig. 1 is a flowchart of a data caching method for data traffic management according to a first embodiment of the present invention. As shown in fig. 1, the method for mapping downlink UE-specific reference signals in an LTE system includes the following steps:
step S102, detecting channel environment parameters;
step S104, comparing the channel environment parameter with the preset parameter;
and step S106, mapping one or two reference signals to a physical resource block of the long-term evolution system according to the comparison result.
According to the mapping method of the downlink UE dedicated reference signal in the LTE system of the first embodiment of the invention, the channel environment is detected, and one or two reference signals are selected to be mapped to one physical resource block of the long term evolution system according to the detection result, so that the two reference signals can be mapped to one physical resource block of the long term evolution system when the channel environment is good, and the technical effect of reducing the system resource overhead is achieved.
Preferably, the channel environment parameter is a signal-to-noise ratio, and mapping one or two reference signals onto one physical resource block of the long term evolution system according to the comparison result specifically includes: if the detected rank of the channel is greater than the preset rank, mapping the two reference signals to a physical resource block of the long-term evolution system; and if the detected rank of the channel is less than the preset rank, respectively mapping one path of reference signal to one physical resource block of the long term evolution system. The method for mapping one path of reference signal to one physical resource block of the LTE system is consistent with the 3GPP LTE communication protocol, and at this time, the single-layer/double-layer status flag may be set to 0 to notify the UE to use single-layer beamforming. If two paths of reference signals are mapped to one physical resource block of the long-term evolution system, the single-layer/double-layer status flag is set to be 1 so as to inform the UE of adopting double-layer beam forming.
Preferably, the channel environment parameter is a signal-to-noise ratio, and mapping one or two reference signals onto one physical resource block of the long term evolution system according to the comparison result specifically includes: if the detected signal-to-noise ratio is larger than the preset signal-to-noise ratio, mapping the two reference signals to a physical resource block of the long-term evolution system; and if the detected signal-to-noise ratio is smaller than the preset signal-to-noise ratio, respectively mapping the two reference signals to two physical resource blocks of the long-term evolution system. The method for mapping one path of reference signal to one physical resource block of the LTE system is consistent with the 3GPP LTE communication protocol, and at this time, the single-layer/double-layer status flag may be set to 0 to notify the UE to use single-layer beamforming. If two paths of reference signals are mapped to one physical resource block of the long-term evolution system, the single-layer/double-layer status flag is set to be 1 so as to inform the UE of adopting double-layer beam forming.
Preferably, the channel environment parameter is an error rate, and mapping one or two reference signals onto one physical resource block of the long term evolution system according to the comparison result specifically includes: if the detected error rate is larger than the preset error rate, mapping one path of reference signal to one physical resource block of the long-term evolution system respectively; and if the detected error rate is less than the preset error rate, mapping the two reference signals to a physical resource block of the long-term evolution system. The method for mapping one path of reference signal to one physical resource block of the LTE system is consistent with the 3GPP LTE communication protocol, and at this time, the single-layer/double-layer status flag may be set to 0 to notify the UE to use single-layer beamforming. If two paths of reference signals are mapped to one physical resource block of the long-term evolution system, the single-layer/double-layer status flag is set to be 1 so as to inform the UE of adopting double-layer beam forming.
Preferably, the physical resource block includes 12 subcarriers in the frequency domain, each reference signal includes multiple reference signals, and mapping the two reference signals to one physical resource block of the long term evolution system specifically includes: mapping two paths of reference signals to N Orthogonal Frequency Division Multiplexing (OFDM) symbols of a physical resource block, wherein the value of N is one of the following values: 3. 4; mapping each path of reference signal to M subcarriers on an OFDM symbol, wherein the value of M is one of the following: 3. 4 and 6. On the basis of not increasing the system resource overhead, two paths of UE special reference signals defined in a 3GPP LTE36 system communication protocol are mapped to one resource block, so that the purpose of supporting double-layer data beam forming transmission is achieved, and the purpose of reducing the system resource overhead is achieved.
Preferably, as shown in fig. 2, the long term evolution system employs a normal cyclic prefix, the physical resource block includes 14 OFDM symbols in the time domain, the mapping two paths of reference signals to 4 OFDM symbols of the physical resource block, and the mapping each path of reference signal to 3 subcarriers on the OFDM symbols specifically includes: mapping a plurality of reference signals in the first path of reference signal R5_1 to the following time-frequency positions: the 0 th subcarrier, the 4 th subcarrier and the 8 th subcarrier of the 3rd OFDM symbol; the 0 th subcarrier, the 4 th subcarrier and the 8 th subcarrier of the 9 th OFDM symbol; mapping a plurality of reference signals in the second path of reference signals R5_2 to the following time-frequency positions: the 2 nd subcarrier, the 6 th subcarrier and the 10 th subcarrier of the 6 th OFDM symbol; the 2 nd subcarrier, the 6 th subcarrier, and the 10 th subcarrier of the 12 th OFDM symbol. On the basis of not increasing the system resource overhead, two paths of UE special reference signals defined in a 3GPP LTE36 system communication protocol are mapped to one resource block, so that the purpose of supporting double-layer data beam forming transmission is achieved, and the purpose of reducing the system resource overhead is achieved.
Preferably, as shown in fig. 3, the long term evolution system employs a normal cyclic prefix, the physical resource block includes 14 OFDM symbols in the time domain, the mapping two paths of reference signals to 4 OFDM symbols of the physical resource block, and the mapping each path of reference signal to 6 subcarriers on the OFDM symbols specifically includes: mapping a plurality of reference signals in the first path of reference signal R5_1 to the following time-frequency positions: the 0 th subcarrier and the 8 th subcarrier of the 3rd OFDM symbol; the 2 nd subcarrier and the 10 th subcarrier of the 6 th OFDM symbol; the 4 th subcarrier of the 9 th OFDM symbol; the 6 th subcarrier of the 12 th OFDM symbol; mapping a plurality of reference signals in the second path of reference signals R5_2 to the following time-frequency positions: the 4 th subcarrier of the 3rd OFDM symbol; a 6 th subcarrier of a 6 th OFDM symbol; the 0 th subcarrier and the 8 th subcarrier of the 9 th OFDM symbol; the 2 nd subcarrier and the 10 th subcarrier of the 12 th OFDM symbol. On the basis of not increasing the system resource overhead, two paths of UE special reference signals defined in a 3GPP LTE36 system communication protocol are mapped to one resource block, so that the purpose of supporting double-layer data beam forming transmission is achieved, and the purpose of reducing the system resource overhead is achieved.
Preferably, as shown in fig. 4, the long term evolution system employs an extended cyclic prefix, the physical resource block includes 12 OFDM symbols in the time domain, the mapping two paths of reference signals to 3 OFDM symbols of the physical resource block, and the mapping each path of reference signal to 4 subcarriers on the OFDM symbols specifically includes: mapping a plurality of reference signals in the first path of reference signal R5_1 to the following frequency positions: the 0 th subcarrier and the 6 th subcarrier of the 4 th OFDM symbol; the 2 nd subcarrier and the 8 th subcarrier of the 7 th OFDM symbol; the 0 th subcarrier and the 6 th subcarrier of the 10 th OFDM symbol; mapping a plurality of reference signals in the second path of reference signals R5_2 to the following time-frequency positions: the 3rd subcarrier and the 9 th subcarrier of the 4 th OFDM symbol; the 5 th subcarrier and the 11 th subcarrier of the 7 th OFDM symbol; the 3rd subcarrier and the 9 th subcarrier of the 10 th OFDM symbol. On the basis of not increasing the system resource overhead, two paths of UE special reference signals defined in a 3GPPLTE 36 system communication protocol are mapped to one resource block, so that the purpose of supporting double-layer data beam forming transmission is achieved, and the purpose of reducing the system resource overhead is achieved.
Preferably, as shown in fig. 5, the long term evolution system employs an extended cyclic prefix, a physical resource block includes 12 OFDM symbols in a time domain, two paths of reference signals are mapped to 3 OFDM symbols of the physical resource block, and mapping each path of reference signal to 6 subcarriers on the OFDM symbols specifically includes: mapping a plurality of reference signals in the first path of reference signal R5_1 to the following frequency positions: the 0 th subcarrier and the 6 th subcarrier of the 4 th OFDM symbol; the 2 nd subcarrier and the 8 th subcarrier of the 7 th OFDM symbol; the 3rd subcarrier and the 9 th subcarrier of the 10 th OFDM symbol; mapping a plurality of reference signals in the second path of reference signals R5_2 to the following time-frequency positions: the 3rd subcarrier and the 9 th subcarrier of the 4 th OFDM symbol; the 5 th subcarrier and the 11 th subcarrier of the 7 th OFDM symbol; the 0 th subcarrier and the 6 th subcarrier of the 10 th OFDM symbol. On the basis of not increasing the system resource overhead, two paths of UE special reference signals defined in a 3GPPLTE 36 system communication protocol are mapped to one resource block, so that the purpose of supporting double-layer data beam forming transmission is achieved, and the purpose of reducing the system resource overhead is achieved.
In the above embodiment, the two reference signals are different pseudo random codes.
The method for mapping the dedicated reference signals of the downlink terminal in the LTE system of the embodiment can map two paths of UE dedicated reference signals defined in a communication protocol of a 3GPP LTE36 system into one resource block when a channel environment is good, so as to achieve the purpose of supporting dual-layer data beamforming transmission, thereby achieving the purpose of reducing system resource overhead.
Fig. 6 is a block diagram of a downlink terminal dedicated reference signal mapping apparatus in an LTE system according to a second embodiment of the present invention. As shown in fig. 6, the apparatus for mapping downlink terminal-specific reference signals in an LTE system according to the second embodiment of the present invention includes: a detecting module 602, configured to detect a channel environment parameter; a comparing module 604, configured to compare the channel environment parameter with a preset parameter; a mapping module 606, configured to map one or two reference signals to a physical resource block of the long term evolution system according to the comparison result.
According to the mapping method for the downlink UE dedicated reference signals in the LTE system, provided by the second embodiment of the invention, the detection module is used for detecting the channel environment, and the mapping module is used for selecting to map one or two reference signals to one physical resource block of the long-term evolution system according to the comparison result, so that the two reference signals can be mapped to one physical resource block of the long-term evolution system when the channel environment is good, and the technical effect of reducing the system resource overhead is achieved.
Preferably, the channel environment parameter is a signal-to-noise ratio or a bit error rate.
The dedicated reference signal mapping device for the downlink terminal in the LTE system of this embodiment can map two UE-dedicated reference signals defined in the 3GPP LTE36 system communication protocol to one resource block when the channel environment is good, so as to achieve the purpose of supporting dual-layer data beamforming transmission, thereby achieving the purpose of reducing the system resource overhead.
As described above, by means of at least one technical solution of the present invention, when the channel environment is good, two UE-specific reference signals defined in the 3GPP LTE36 system communication protocol can be mapped to one resource block, thereby achieving the technical effect of reducing the system resource overhead.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A method for mapping dedicated reference signals of a downlink terminal in a long term evolution system is characterized by comprising the following steps:
detecting a channel environment parameter;
comparing the channel environment parameter with a preset parameter;
mapping one or two reference signals to a physical resource block of the long-term evolution system according to the comparison result;
when the physical resource block includes 12 subcarriers in the frequency domain, and each reference signal includes multiple reference signals, mapping two reference signals onto one physical resource block of a long term evolution system specifically includes: mapping the two paths of reference signals to N Orthogonal Frequency Division Multiplexing (OFDM) symbols of the physical resource block, wherein the value of N is one of the following values: 3. 4; mapping each path of the reference signal to M subcarriers on the OFDM symbol, wherein a value of M is one of the following: 3. 4, 6;
when the long term evolution system employs a normal cyclic prefix and the physical resource block includes 14 OFDM symbols in a time domain, mapping the two paths of reference signals to 4 OFDM symbols of the physical resource block, and mapping each path of reference signal to 6 subcarriers on the OFDM symbols specifically includes: mapping a plurality of reference signals in the first path of reference signals to the following time-frequency positions: the 0 th subcarrier and the 8 th subcarrier of the 3rd OFDM symbol; the 2 nd subcarrier and the 1 st O subcarrier of the 6 th OFDM symbol; the 4 th subcarrier of the 9 th OFDM symbol; the 6 th subcarrier of the 12 th OFDM symbol; mapping a plurality of reference signals in the second path of reference signals to the following time-frequency positions: the 4 th subcarrier of the 3rd OFDM symbol; a 6 th subcarrier of a 6 th OFDM symbol; the 0 th subcarrier and the 8 th subcarrier of the 9 th OFDM symbol; the 2 nd subcarrier and the 10 th subcarrier of the 12 th OFDM symbol; or,
when the long term evolution system employs an extended cyclic prefix and the physical resource block includes 12 OFDM symbols in the time domain, mapping the two paths of reference signals onto 3 OFDM symbols of the physical resource block, and mapping each path of reference signal onto 4 subcarriers on the OFDM symbols specifically includes: mapping a plurality of reference signals in the first path of reference signals to the following time-frequency positions: the 0 th subcarrier and the 6 th subcarrier of the 4 th OFDM symbol; the 2 nd subcarrier and the 8 th subcarrier of the 7 th OFDM symbol; the O th subcarrier and the 6 th subcarrier of the 10 th OFDM symbol; mapping a plurality of reference signals in the second path of reference signals to the following time-frequency positions: the 3rd subcarrier and the 9 th subcarrier of the 4 th OFDM symbol; the 5 th subcarrier and the 11 th subcarrier of the 7 th OFDM symbol; the 3rd subcarrier and the 9 th subcarrier of the 10 th OFDM symbol; or,
when the long term evolution system employs an extended cyclic prefix and the physical resource block includes 12 OFDM symbols in the time domain, mapping the two paths of reference signals to 3 OFDM symbols of the physical resource block, and mapping each path of reference signal to 6 subcarriers on the OFDM symbol specifically includes: mapping a plurality of reference signals in the first path of reference signals to the following time-frequency positions: the 0 th subcarrier and the 6 th subcarrier of the 4 th OFDM symbol; the 2 nd subcarrier and the 8 th subcarrier of the 7 th OFDM symbol; the 3rd subcarrier and the 9 th subcarrier of the 10 th OFDM symbol; mapping a plurality of reference signals in the second path of reference signals to the following time-frequency positions: the 3rd subcarrier and the 9 th subcarrier of the 4 th OFDM symbol; the 5 th subcarrier and the 11 th subcarrier of the 7 th OFDM symbol; the 0 th subcarrier and the 6 th subcarrier of the 10 th OFDM symbol.
2. The method of claim 1, wherein the channel environment parameter is rank, and mapping the one or two reference signals onto one physical resource block of the long term evolution system according to the comparison result specifically comprises:
if the detected rank of the channel is greater than the preset rank, mapping the two reference signals to a physical resource block of the long-term evolution system;
and if the detected rank of the channel is less than the preset rank value, mapping one path of reference signals to one physical resource block of the long-term evolution system.
3. The method of claim 1, wherein the channel environment parameter is a signal-to-noise ratio, and mapping the one or two reference signals onto one physical resource block of the long term evolution system according to the comparison result specifically comprises:
if the detected signal-to-noise ratio is larger than the preset signal-to-noise ratio, mapping the two reference signals to a physical resource block of the long-term evolution system;
and if the detected signal-to-noise ratio is smaller than the preset signal-to-noise ratio, mapping one path of reference signal to one physical resource block of the long-term evolution system respectively.
4. The method of claim 1, wherein the channel environment parameter is a bit error rate, and mapping the one or two reference signals to a physical resource block of a long term evolution system according to the comparison result specifically comprises:
if the detected error rate is larger than the preset error rate, mapping one path of reference signal to one physical resource block of the long-term evolution system respectively;
and if the detected error rate is less than the preset error rate, mapping the two reference signals to a physical resource block of the long-term evolution system.
5. The method according to claim 1, wherein, in case that the long term evolution system employs a normal cyclic prefix and the physical resource block contains 14 OFDM symbols in a time domain, the mapping the two paths of reference signals onto 4 OFDM symbols of the physical resource block and the mapping each path of reference signal onto 3 subcarriers on the OFDM symbols specifically comprises:
mapping a plurality of reference signals in the first path of reference signals to the following time-frequency positions: the 0 th subcarrier, the 4 th subcarrier and the 8 th subcarrier of the 3rd OFDM symbol; the 0 th subcarrier, the 4 th subcarrier and the 8 th subcarrier of the 9 th OFDM symbol;
mapping a plurality of reference signals in the second path of reference signals to the following time-frequency positions: the 2 nd subcarrier, the 6 th subcarrier and the 10 th subcarrier of the 6 th OFDM symbol; the 2 nd subcarrier, the 6 th subcarrier, and the 10 th subcarrier of the 12 th OFDM symbol.
6. A dedicated reference signal mapping device for a downlink terminal in a long term evolution system is characterized by comprising:
the detection module is used for detecting the channel environment parameters;
the comparison module is used for comparing the channel environment parameters with preset parameters;
the mapping module is used for mapping one or two reference signals to a physical resource block of the long-term evolution system according to the comparison result;
when the physical resource block includes 12 subcarriers in the frequency domain, and each reference signal includes multiple reference signals, the mapping module is configured to map two reference signals to one physical resource block of a long term evolution system, which specifically includes: mapping the two paths of reference signals to N Orthogonal Frequency Division Multiplexing (OFDM) symbols of the physical resource block, wherein the value of N is one of the following values: 3. 4; mapping each path of the reference signal to M subcarriers on the OFDM symbol, wherein a value of M is one of the following: 3. 4, 6;
when the long term evolution system employs a normal cyclic prefix and the physical resource block includes 14 OFDM symbols in a time domain, the mapping module is configured to map the two paths of reference signals to 4 OFDM symbols of the physical resource block, and map each path of reference signal to 6 subcarriers on the OFDM symbol specifically includes: mapping a plurality of reference signals in the first path of reference signals to the following time-frequency positions: the 0 th subcarrier and the 8 th subcarrier of the 3rd OFDM symbol; the 2 nd subcarrier and the 10 th subcarrier of the 6 th OFDM symbol; the 4 th subcarrier of the 9 th OFDM symbol; the 6 th subcarrier of the 12 th OFDM symbol; mapping a plurality of reference signals in the second path of reference signals to the following time-frequency positions: the 4 th subcarrier of the 3rd OFDM symbol; a 6 th subcarrier of a 6 th OFDM symbol; the 0 th subcarrier and the 8 th subcarrier of the 9 th OFDM symbol; the 2 nd subcarrier and the 10 th subcarrier of the 12 th OFDM symbol; or,
when the long term evolution system employs an extended cyclic prefix and the physical resource block includes 12 OFDM symbols in the time domain, the mapping module is configured to map the two paths of reference signals to 3 OFDM symbols of the physical resource block, and map each path of reference signal to 4 subcarriers on the OFDM symbol specifically includes: mapping a plurality of reference signals in the first path of reference signals to the following time-frequency positions: the 0 th subcarrier and the 6 th subcarrier of the 4 th OFDM symbol; the 2 nd subcarrier and the 8 th subcarrier of the 7 th OFDM symbol; the 0 th subcarrier and the 6 th subcarrier of the 10 th OFDM symbol; mapping a plurality of reference signals in the second path of reference signals to the following time-frequency positions: the 3rd subcarrier and the 9 th subcarrier of the 4 th OFDM symbol; the 5 th subcarrier and the 11 th subcarrier of the 7 th OFDM symbol; the 3rd subcarrier and the 9 th subcarrier of the 10 th OFDM symbol; or,
when the long term evolution system employs an extended cyclic prefix and the physical resource block includes 12 OFDM symbols in a time domain, the mapping module is configured to map the two paths of reference signals to 3 OFDM symbols of the physical resource block, and map each path of reference signal to 6 subcarriers on the OFDM symbol specifically includes: mapping a plurality of reference signals in the first path of reference signals to the following time-frequency positions: the 0 th subcarrier and the 6 th subcarrier of the 4 th OFDM symbol; the 2 nd subcarrier and the 8 th subcarrier of the 7 th OFDM symbol; the 3rd subcarrier and the 9 th subcarrier of the 10 th OFDM symbol; mapping a plurality of reference signals in the second path of reference signals to the following time-frequency positions: the 3rd subcarrier and the 9 th subcarrier of the 4 th OFDM symbol; the 5 th subcarrier and the 11 th subcarrier of the 7 th OFDM symbol; the 0 th subcarrier and the 6 th subcarrier of the 10 th OFDM symbol.
7. The apparatus of claim 6, wherein the channel environment parameter is a rank or a signal-to-noise ratio or a bit error rate.
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