CN1527512A - Training sign generating and transmitting method in orthogonal frequency-division multiplexing system - Google Patents
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Abstract
The training sign generating method includes the following steps: using L son carriers in orthogonal frequency-division multiplexing system with N son carriers, with L being smaller than or equal to N; constituting transmission frame structure including upper line son frame and lower line son frame, with the training sign comprising one OFDM sign and its circular prefix; and creating the OFDM sign with setting frequency training sequence on the used son carrier and performing inverse Fourier transform. The training sign may be used in the synchronization, channel estimation and AGC in OFDM communication system, channel estimation among different antennas in antenna system, etc. Applying the training sign in AAS indicator can avoid interference caused by the same structure of available training sign. The present invention described training sign and its application in AAS system is easy to realize in available IEEE802.16a, high performance MAN specification (Hiperman), etc.
Description
Technical field
The present invention relates to OFDM (OFDM) communication technical field, specifically, the present invention relates generally to a kind of new training symbol in the ofdm communication system physical layer, and this training symbol can be used to do synchronously, channel estimating etc.
Background technology
In a lot of ofdm systems, training symbol has very important effect as some important in the OFDM frame, and the design of training symbol has different designs for different ofdm systems.In a lot of ofdm communication systems all adaptive antenna (AAS) but technology obtains system gain as a selecting technology.In such system, when the AAS technology is adopted in the base station (hereinafter to be referred as the AAS base station, corresponding system claims the AAS system), the sub-district of this base station services can be supported to adopt the terminal (hereinafter to be referred as the AAS terminal) of AAS technology simultaneously and do not adopted the terminal (hereinafter to be referred as non-AAS terminal) of AAS technology.
In the AAS system, some known symbols can be transmitted in the base station in descending (from the base station to the terminal) channel to indicate this system be the AAS system, the AAS terminal is when initially inserting this system, and need capture this kind known symbol could come connecting system by certain competition access mechanism by some specific access slot.We claim that this kind known symbol is the AAS indicating device.In fact, above-mentioned being used for indicates the known symbol in the AAS system, and promptly the AAS indicating device also is a kind of training symbol.Training symbol in the ofdm system can have different structures according to different methods for designing.It can be used for doing synchronously, channel estimating, automatic gain control etc.Training symbol in the actual ofdm system all is on frequency domain known sequences to be done quick inverse-Fourier transform (IFFT) to obtain, and we claim that this kind sequence is a frequency domain training sequence.In the 2560FDM physical layer of high-performance metropolitan area network standard (Hiperman) and 802.16a, have 256 subcarriers, label is-128 to 127, but the actual label of only having used is 200 subcarriers of-100 to 100, wherein label is that 0 zero subcarrier need not.
For example a lot of training symbols have been used in the 256 FDM physical layers of high-performance metropolitan area network standard (Hiperman) and 802.16a in the current system, if introduce a kind of new training symbol, the structure of the training symbol that this is new should have the structure that is different from the training symbol that has used.This training symbol should have low power peak-to-average ratio and good correlation properties simultaneously.To introduce a kind of new training symbol in the 256 OFDM standards of high-performance metropolitan area network standard (Hiperman) and 802.16a and indicate the AAS system.This training symbol will have low power peak-to-average ratio and good correlation properties equally.
At present, be proposed for the training symbol that indicates the AAS system and all have more following problems:
1: the training symbol that is proposed that has is structurally identical with the already used training symbol of existing standard, can cause like this having very big interference between the training symbol, even can not correctly capture corresponding training symbol;
2: the training symbol that is proposed that has does not have very low power peak-to-average ratio and good correlation properties.High power peak-to-average ratio can cause the distortion that transmits, and good correlation properties help the estimation of synchronization parameter.
Summary of the invention
At the technical problem of above-mentioned existence, the invention provides a kind of new training symbol, this symbol has the structure of the training symbol that is different from existing standard existence, has very low power peak-to-average ratio and good correlation properties simultaneously.
For achieving the above object, produce the method for training symbol in a kind of ofdm system, comprise step:
Have N subcarrier in orthogonal FDM communication system, the subcarrier that uses is L, and wherein L is less than or equal to N;
Every transmission frame-form comprises descending sub frame and sub-frame of uplink,
It is characterized in that also comprising step:
Training symbol is made up of an OFDM symbol and Cyclic Prefix thereof;
Described OFDM symbol carries out inverse-Fourier transform and generates by place frequency domain training sequence on the subcarrier that uses.
The present invention introduces a kind of new training symbol, and this symbol has very low power peak-to-average ratio and good correlation properties.It is synchronous that this training symbol can be used for ofdm communication system, the control of channel estimating automatic gain, and the purposes such as channel estimating between different antennae in the multiaerial system.It is the AAS system that this new training symbol can indicate current system as the AAS System pointer.When adopting this training symbol to be the AAS indicating device, can avoid owing to standard in existing training symbol have the interference that identical structure produces.Owing to introduce the AAS indicating device, and AAS indicating device and AAS alarm time slot bundle, and so just there is no need all to place AAS alarm time slot at each sub-frame of uplink, so just might reduce the extra expense of bringing owing to AAS alarm time slot.Training symbol and its application in the AAS system that the present invention describes realize in existing IEEE802.16a and high-performance metropolitan area network standard standards such as (Hiperman) extremely easily.
Description of drawings
Fig. 1 is in conjunction with the tdd frame structure of AAS indicating device and FDD frame structure, wherein the existence of AAS indicating device mapping AAS alarm time slot;
Fig. 2 is the frame structure example of time division duplex (TDD) system, comprises descending sub frame, sub-frame of uplink, and a transmit receive separation and a receipts are at interval;
Fig. 3 is the frame structure example of Frequency Division Duplexing (FDD) (FDD) system, comprises descending sub frame and sub-frame of uplink;
Fig. 4 is a downstream data traffic, is made up of the downlink business segmentation;
Fig. 5 is a uplink service, is made up of the uplink service segmentation;
Fig. 6 is when not having the AAS indicating device, the flow graph of terminal connecting system;
Fig. 7 is the training symbol structure, and wherein Tg represents the length of Cyclic Prefix, and Tb represents the length of an OFDM data symbol, the symbol of BI and the opposite in sign of B;
Fig. 8 is the AAS terminal inserts the AAS system by the AAS indicating device a flow graph.
Embodiment
When the new symbol of the present invention is used to indicate the AAS system, transmit this training symbol at down channel by the AAS base station.The AAS terminal confirms that by capturing this training symbol current system is the AAS system, and available it realize or the auxiliary Time and Frequency Synchronization that realizes channel estimating, automatic gain control, and the functions such as channel estimating between different antennae in the multiaerial system.
This new symbol not only can be used to indicate the AAS system, it also can place any position of ofdm system uplink and downlink Channel Transmission, as Time and Frequency Synchronization, channel estimating, automatic gain control, and the purposes such as channel estimating between different antennae in the multiaerial system, it can also be used with other symbols and transmission method, finish above mentioned various function, thereby reduce transmission error rates, improve systematic function.
In a lot of ofdm systems, for example IEEE802.16a and high-performance metropolitan area network standard (Hiperman) have all comprised the communication mode of time division duplex (TDD) and Frequency Division Duplexing (FDD) (FDD).With respect to this dual mode two kinds of different transmission frame-forms are arranged, example as these two kinds of frame structures is distinguished as shown in Figures 2 and 3, in these two kinds of frame structures, each frame has all comprised descending sub frame and sub-frame of uplink, and wherein TDD also comprises the transmitting-receiving gap and sends out and receive the gap.The beginning of descending sub frame is long access lead (long preamble), and this long access lead is a kind of specific training sequence, is used to determine the beginning of each frame.Followed by long access lead be frame control head (FCH) information, this information is some control informations, is used for illustrating current frame length, type of service, current channel quality etc.Simultaneously, frame control head has also comprised descending map information (DL-MAP) and up map information (UL-MAP), and wherein DL-MAP shines upon data service segmentation (burst) situation of current descending sub frame, comprises the position, the user of use etc.; UL-MAP shines upon data service segmentation (burst) situation of current sub-frame of uplink or next sub-frame of uplink, comprises the position, the user of use etc., the information that while UL-MAP also shines upon random access time slot and bandwidth request time slot.Fig. 4 and Fig. 5 are respectively the illustrations of downstream data traffic and uplink service.Concerning the AAS system, some position of sub-frame of uplink is mapped as a known traffic segment, and its particular location can be determined by specific AAS indicating device or known frame structure, does not need UL-MAP to shine upon, and is AAS alarm time slot.
Concerning a certain non-AAS terminal, when a certain terminal will insert current system, at first want the decoded frame control head to obtain position by the random access time slot of UL-MAP mapping, carry out initial random access procedure at random access time slot then.Concerning a certain AAS terminal, if this terminal can the decoded frame control head and want to carry out initial random access at random access time slot, this process and non-AAS terminal is the same so.Otherwise this terminal can directly be carried out initial random access by AAS alarm time slot.Insert flow graph as shown in Figure 6.
When terminal can directly be carried out initial random access by AAS alarm time slot, do not need the decoded frame control head, it only need catch the AAS indicating device, knows not only that by indicating device current system is the AAS system, also knows that by indicating device some time slot of current sub-frame of uplink is the alarm time slot simultaneously.
New training symbol of the present invention can be used as the AAS indicating device.This training symbol structure as shown in Figure 7, this training symbol is made of a Cyclic Prefix and an OFDM symbol, this OFDM symbol is made of two repeating parts with contrary sign.
Correspond to 802.16 256 ofdm system patterns and Hiperman OFDM pattern, the length of the repeating part in the structure of this training symbol in the OFDM symbol is 128.
In ofdm system, known training symbol is on frequency domain known sequences to be done quick inverse-Fourier change (IFFT) to obtain, and we claim that this kind sequence is a frequency domain training sequence.
If frequency domain training sequence is { p
i| i=-N/2 ..., N/2-1} wherein N is an IFFT length, corresponding OFDM modulated sub-carriers (subcarrier) label of i so, can get known training symbol
In 256 OFDM patterns, always have 256 subcarriers, label respectively from-128 to 127, only with wherein 200 subcarriers, label is-100 to 100, wherein label is that 0 zero subcarrier need not.
In order to produce the ofdm signal in the structure, the frequency domain training sequence of employing can be any one of following four sequences.As for which adopts, can arrange in advance or identify following four sequences one by the frequency domain training sequence label of appointment.
{p1
i|i＝-100∶100}＝{ 0 1 0 1 0 -1 0 1 0 1 0 1 0
1 0 1 0 -1 0 -1 0 1 0 1 0 -1 0 1 0 1 0
1 0 1 0 1 0 -1 0 -1 0 -1 0 -1 0 1 0 -1 0
-1 0 -1 0 -1 0 -1 0 1 0 1 0 1 0 1 0 -1 0
1 0 1 0 1 0 1 0 1 0 -1 0 -1 0 -1 0 -1 0
1 0 -1 0 1 0 -1 0 1 0 1 0 -1 0 -1 0 1 0
1 0 -1 0 1 0 1 0 1 0 1 0 1 0 -1 0 -1 0
-1 0 -1 0 1 0 -1 0 1 0 -1 0 1 0 1 0 -1 0
-1 0 -1 0 -1 0 1 0 -1 0 1 0 -1 0 1 0 1 0
-1 0 -1 0 1 0 1 0 -1 0 1 0 -1 0 1 0 -1 0
-1 0 1 0 1 0 1 0 1 0 -1 0 1 0 -1 0 1 0
-1 0 -1 0 1 0 1 0?}?*W
{p2
i|i＝-100∶100}＝{ 0 1 0 -1 0 -1 0 -1 0 1 0 -1 0
1 0 -1 0 -1 0 1 0 1 0 -1 0 -1 0 -1 0 1 0
-1 0 1 0 -1 0 -1 0 1 0 -1 0 1 0 1 0 1 0
-1 0 1 0 -1 0 1 0 1 0 -1 0 1 0 -1 0 -1 0
-1 0 1 0 -1 0 1 0 -1 0 -1 0 1 0 -1 0 1 0
1 0 1 0 1 0 1 0 1 0 -1 0 -1 0 1 0 1 0
-1 0 -1 0 -1 0 1 0 -1 0 1 0 -1 0 -1 0 1 0
-1 0 1 0 1 0 1 0 1 0 1 0 1 0 -1 0 -1 0
1 0 -1 0 1 0 1 0 1 0 1 0 1 0 1 0 -1 0
-1 0 1 0 1 0 -1 0 -1 0 -1 0 -1 0 -1 0 -1 0
1 0 1 0 -1 0 1 0 -1 0 -1 0 -1 0 -1 0 -1 0
-1 0 1 0 1 0 -1 0?}?*W
{p3
i|i＝-100∶100}＝{0 1 0 -1 0 -1 0 1 0 1 0 1 0
1 0 1 0 1 0 -1 0 1 0 -1 0 -1 0 1 0 1 0
1 0 1 0 1 0 1 0 -1 0 -1 0 1 0 1 0 -1 0
-1 0 -1 0 -1 0 -1 0 -1 0 1 0 -1 0 1 0 1 0
-1 0 -1 0 -1 0 -1 0 -1 0 -1 0 1 0 -1 0 1 0
1 0 -1 0 1 0 -1 0 1 0 1 0 1 0 -1 0 -1 0
1 0 1 0 -1 0 -1 0 -1 0 -1 0 -1 0 -1 0 1 0
-1 0 1 0 1 0 -1 0 1 0 -1 0 1 0 1 0 1 0
-1 0 1 0 -1 0 -1 0 1 0 -1 0 1 0 -1 0 -1 0
-1 0 1 0 -1 0 1 0 1 0 -1 0 1 0 -1 0 1 0
1 0 1 0 -1 0 -1 0 1 0 1 0 -1 0 1 0 -1 0
1 0 1 0 1 0 -1 0?}?*W
{p4
i|i＝-100∶100}＝{?0 1 0 -1 0 -1 0 -1 0 1 0 -1 0 1 0 -1 0
-1 0 1 0 -1 0 1 0 1 0 1 0 -1 0 1 0?-1 0 1 0 1 0 -1
0 -1 0 1 0 1 0 1 0 -1 0 1 0 -1 0 1 0 1 0 -1 0 -1 0
1 0 1 0 1 0 1 0 1 0 1 0 -1 0 -1 0 1 0 -1 0 1 0 1
0 1 0?-1 0 1 0 -1 0 1 0 1 0 -1 0 -1 0 1 0 1 0 1 0
1 0 1 0 1 0?-1 0 -1 0 1 0 -1 0 1 0 1 0 1 0 -1 0 1
0 -1 0 1 0 1 0 -1 0 1 0 -1 0 -1 0 -1 0 -1 0 -1 0 -1 0 1
0 1 0 -1 0 1 0 -1 0 -1 0 -1 0 -1 0 -1 0 -1 0 1 0 1 0 -
1 0?-1 0 1 0 1 0 1 0 1 0 1 0 1 0 -1 0 -1 0 1 0?}?*W
Here only provide the value of i from-100 to 100, other positions are zero, will be zero as-128 to-101 among 256 OFDM and 101 to 127, and wherein W is a coefficient of determining, can be any real number or plural number.
According to above-mentioned frequency domain training sequence, sequence is placed on carries out the BPSK modulation on the corresponding subcarrier, when realizing, can require suitably adjust average power according to the conditioned disjunction power emission of air traffic channel, promptly adjust the value of W, just can reach the purpose of power ascension or power pressure drop.Above-mentioned frequency domain training sequence will obtain corresponding training symbol through IFFT.This training symbol on time domain, have (B, architectural feature BI), as shown in Figure 7.
The present invention introduces the AAS indicating device, and to indicate current system be the AAS system, in the AAS system in conjunction with the AAS indicating device, when the AAS terminal wants initially to insert this system by AAS alarm time slot, must at first will catch this AAS indicating device.Can know that so just current system is the AAS system, and have AAS alarm time slot.
The AAS indicating device indicates not only whether current system is the AAS system, also indicates present frame whether to have AAS alarm time slot simultaneously.The AAS base station will guarantee that the AAS indicating device bundles when scheduling resource, that is to say, when when there is the AAS indicating device in current descending sub frame, just there is AAS alarm time slot certainly in so current sub-frame of uplink.
Corresponding to 802.16 256 OFDM (P802.16a/D7-2003.1) system pattern and HipermanOFDM pattern (BRAN031d89-2002.12 BRAN031d88-2002.12), when system is the TDD system, the AAS indicating device is being sent out beginning of receiving the gap or last symbol transmission of sending out the descending sub frame before receiving the gap, and the alarm time slot is a K OFDM symbol of the beginning of current sub-frame of uplink.When system was the FDD system, the AAS indicating device can be in the transmission of the optional position of descending sub frame, and K the OFDM symbol that begins backward from alignment AAS indicating device in sub-frame of uplink is the alarm time slot so.These mapping relations such as Fig. 1.
In the AAS system in conjunction with the AAS indicating device, the AAS terminal if this terminal is want to come connecting system by the alarm time slot, is searched descending sub frame so and is seen and have the AAS indicating device when start or restarting.After finding the AAS indicating device, this terminal is determined to determine with regard to the mapping ruler that defines the position of AAS alarm time slot to carry out system at AAS alarm time slot then and initially insert by this AAS indicating device in advance.Flow graph as shown in Figure 8.
Claims (9)
1. produce the method for training symbol in the ofdm system, comprise step:
Have N subcarrier in orthogonal FDM communication system, the subcarrier that uses is L, and wherein L is less than or equal to N;
Every transmission frame-form comprises descending sub frame and sub-frame of uplink,
It is characterized in that also comprising step:
Training symbol is made up of an OFDM symbol and Cyclic Prefix thereof;
Described OFDM symbol carries out inverse-Fourier transform and generates by place frequency domain training sequence on the subcarrier that uses.
2. by the described method of claim 1, it is characterized in that: when N was even number, the subcarrier label was-N/2 is to N/2.
3. by the described method of claim 1, it is characterized in that: described OFDM symbol is made of two opposite repeating parts, promptly has (B, structure BI) on time domain.
4. by claim 1 or 2 described methods, it is characterized in that: at label be [100 ..., 100] subcarrier on place frequency domain training sequence { p1 accordingly
i| i=-100:100} carries out the OFDM symbol and the ofdm signal part of its Cyclic Prefix as this training symbol that inverse-Fourier transform obtains,
{ p1 wherein
i| i=-100:100} is as follows:
{p1
i|i＝-100:100}＝{ 0 1 0 1 0 -1 0 1 0 1 0 1 0
1 0 1 0 -1 0 -1 0 1 0 1 0 -1 0 1 0 1 0
1 0 1 0 1 0 -1 0 -1 0 -1 0 -1 0 1 0 -1 0
-1 0 -1 0 -1 0 -1 0 1 0 1 0 1 0 1 0 -1 0
1 0 1 0 1 0 1 0 1 0 -1 0 -1 0 -1 0 -1 0
1 0 -1 0 1 0 -1 0 1 0 1 0 -1 0 -1 0 1 0
1 0 -1 0 1 0 1 0 1 0 1 0 1 0 -1 0 -1 0
-1 0 -1 0 1 0 -1 0 1 0 -1 0 1 0 1 0 -1 0
-1 0 -1 0 -1 0 1 0 -1 0 1 0 -1 0 1 0 1 0
-1 0 -1 0 1 0 1 0 -1 0 1 0 -1 0 1 0 -1 0
-1 0 1 0 1 0 1 0 1 0 -1 0 1 0 -1 0 1 0
-1 0 -1 0 1 0 1 0} *W
Wherein W is a coefficient of determining, can be any real number or plural number.
5. by claim 1 or 2 described methods, it is characterized in that: at label be [100 ..., 100] subcarrier on place frequency domain training sequence { p2 accordingly
i| i=-100:100} carries out the OFDM symbol and the ofdm signal part of its Cyclic Prefix as this training symbol that inverse-Fourier transform obtains,
{ p2 wherein
i| i=-100:100} is as follows:
{p2
i|i＝-100:100}＝{ 0 1 0 -1 0 -1 0 -1 0 1 0 -1 0
1 0 -1 0 -1 0 1 0 1 0 -1 0 -1 0 -1 0 1 0
-1 0 1 0 -1 0 -1 0 1 0 -1 0 1 0 1 0 1 0
-1 0 1 0 -1 0 1 0 1 0 -1 0 1 0 -1 0 -1 0
-1 0 1 0 -1 0 1 0 -1 0 -1 0 1 0 -1 0 1 0
1 0 1 0 1 0 1 0 1 0 -1 0 -1 0 1 0 1 0
-1 0 -1 0 -1 0 1 0 -1 0 1 0 -1 0 -1 0 1 0
-1 0 1 0 1 0 1 0 1 0 1 0 1 0 -1 0 -1 0
1 0 -1 0 1 0 1 0 1 0 1 0 1 0 1 0 -1 0
-1 0 1 0 1 0 -1 0 -1 0 -1 0 -1 0 -1 0 -1 0
1 0 1 0 -1 0 1 0 -1 0 -1 0 -1 0 -1 0 -1 0
-1 0 1 0 1 0 -1 0} *W
Wherein W is a coefficient of determining, can be any real number or plural number.
6. by claim 1 or 2 described methods, it is characterized in that: at label be [100 ..., 100] subcarrier on place frequency domain training sequence { p3 accordingly
i| i=-100:100} carries out the OFDM symbol and the ofdm signal part of its Cyclic Prefix as this training symbol that inverse-Fourier transform obtains,
{ p3 wherein
i| i=-100:100} is as follows:
{p3
i|i＝-100:100}＝{0 1 0 -1 0 -1 0 1 0 1 0 1 0
1 0 1 0 1 0 -1 0 1 0 -1 0 -1 0 1 0 1 0
1 0 1 0 1 0 1 0 -1 0 -1 0 1 0 1 0 -1 0
-1 0 -1 0 -1 0 -1 0 -1 0 1 0 -1 0 1 0 1 0
1 0 -1 0 -1 0 -1 0 -1 0 -1 0 1 0 -1 0 1 0
1 0 -1 0 1 0 -1 0 1 0 1 0 1 0 -1 0 -1 0
1 0 1 0 -1 0 -1 0 -1 0 -1 0 -1 0 -1 0 1 0
-1 0 1 0 1 0 -1 0 1 0 -1 0 1 0 1 0 1 0
-1 0 1 0 -1 0 -1 0 1 0 -1 0 1 0 -1 0 -1 0
-1 0 1 0 -1 0 1 0 1 0 -1 0 1 0 -1 0 1 0
1 0 1 0 -1 0 -1 0 1 0 1 0 -1 0 1 0 -1 0
1 0 1 0 1 0 -1 0?} *W
Wherein W is a coefficient of determining, can be any real number or plural number.
7. by claim 1 or 2 described methods, it is characterized in that: at label be [100 ..., 100] subcarrier on place frequency domain training sequence { p3 accordingly
i| i=-100:100} carries out the OFDM symbol and the ofdm signal part of its Cyclic Prefix as this training symbol that inverse-Fourier transform obtains,
{ p3 wherein
i| i=-100:100} is as follows:
{p4
i|i＝-100:100}＝{ 0 1 0 -1 0 -1 0 -1 0 1 0 -1 0 1 0 -1 0
-1 0 1 0 -1 0 1 0 1 0 1 0 -1 0 1 0 -1 0 1 0 1 0 -1
0 -1 0 1 0 1 0 1 0 -1 0 1 0 -1 0 1 0 1 0 -1 0 -1 0
1 0 1 0 1 0 1 0 1 0 1 0 -1 0 -1 0 1 0?-1 0 1 0 1
0 1 0 -1 0 1 0 -1 0 1 0 1 0 -1 0 -1 0 1 0 1 0 1 0
1 0 1 0 1 0 -1 0 -1 0 1 0 -1 0 1 0 1 0 1 0?-1 0 1
0 -1 0 1 0 1 0 -1 0 1 0 -1 0 -1 0 -1 0 -1 0?-1 0?-1 0 1
0 1 0 -1 0 1 0 -1 0 -1 0 -1 0 -1 0 -1 0 -1 0 1 0 1 0 -1
0 -1 0 1 0 1 0 1 0 1 0 1 0 1 0 -1 0 -1 0 1 0 } *W
Wherein W is a coefficient of determining, can be any real number or plural number.
8. the method for transmission training symbol in the ofdm system, comprise: when training symbol transmits in descending sub frame, the user is when this system of access, at first want the searching downlink subframe whether to have this training symbol, if exist, this user just can be at the random access time slot connecting system of this training symbol maps, if there is no so, search for next descending sub frame so and whether have this training symbol, find till the random access time slot by this training symbol maps always.
9. by the described method of claim 7, it is characterized in that: when ofdm system adopted the time division duplex communication mode, the transmission rule of the random access time slot of training symbol and its mapping was:
If this training symbol the transmission of the decline of the descending sub frame of a certain frame or send out receive the gap begin send, K OFDM beginning of the sub-frame of uplink of this frame is random access time slot so;
When this ofdm system adopted Frequency Division Duplexing (FDD) (FDD) communication mode, the transmission rule of the random access time slot of training symbol and its mapping was:
If this training symbol sends in a certain position of the descending sub frame of a certain frame, K the OFDM symbol that begins backward from this training symbol that aligns in sub-frame of uplink is random access time slot so.
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| CN101263669A (en) * | 2005-03-09 | 2008-09-10 | 高通股份有限公司 | Methods and apparatus for antenna control in a wireless terminal |
| CN101263669B (en) * | 2005-03-09 | 2013-01-30 | 高通股份有限公司 | Methods and apparatus for antenna control in a wireless terminal |
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