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Condition code distribution method of E-HICH channel

A distribution method and feature code technology, applied in multiplex code distribution, wireless communication, digital transmission systems, etc., can solve the problems of poor cross-correlation performance, low false detection rate, poor transmission performance, etc., and avoid good transmission performance. , the effect of reducing the average false detection rate and improving satisfaction

Active Publication Date: 2012-09-26
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because the wireless channel is usually a multipath channel, that is, the signal received by the receiving end is the superposition of the signal sent by the sending end after different delays, which leads to the existence of Inter Symbol Interference (ISI) in the received signal, and the receiving end Before signal detection, it is usually necessary to use an equalizer to equalize the received signal to reduce ISI and improve detection performance. However, the delay of the actual equalizer is limited. After equalizing the received signal, it is impossible to completely eliminate ISI
At this time, if the cross-correlation performance of the two signals is not good, the false detection rate of the feedback information sent to each UE at the receiving end is relatively high
[0018] In the HSUPA process, if the signature code used by the UE remains unchanged, it means that the cross-correlation characteristics between each signature code remain unchanged. In this way, the codeword with good cross-correlation performance will make the UE respond to the feedback sent to it The error detection rate of the information is low, and the codeword with poor cross-correlation makes the UE have a high error detection rate for the feedback information sent to it, thus causing the HSUPA transmission performance of some UEs to be good, while the transmission performance of other UEs is poor. The unfairness of poor performance

Method used

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  • Condition code distribution method of E-HICH channel
  • Condition code distribution method of E-HICH channel
  • Condition code distribution method of E-HICH channel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] In this embodiment, the specific steps of the random permutation function are as follows:

[0052] (1) Initializing the permutation sequence mainly refers to setting the length M=80 of the permutation sequence, and initializing the permutation sequence P, wherein P(0)=0, P(1)=1, ..., P( M-1)=M-1; then, set i=0;

[0053] (2) calculate and obtain a permutation sequence P relevant to SFN ', in the present embodiment its specific implementation steps are as follows:

[0054] Perform the following steps a to c in a loop until i=M-2;

[0055] a. Generate a random number k with a value ranging from 0 to M-i. The method of generating the random number must be known to NodeB and UE, which can be generated using the system subframe number SFN' as a seed;

[0056] B, replacement P (i) and P (k+i), promptly tmp=P (i), P (i)=P (k+i), P (k+i)=tmp;

[0057] c. Add 1 to i.

[0058] In the above step a, there are many ways to generate random numbers, but the generated random numbers...

Embodiment 2

[0065] Embodiment 2: The specific steps of the random permutation function are as follows:

[0066] (1) The sending and receiving parties agree on an initial permutation sequence Q(0), Q(1)..., Q(M-1) whose length is M=80;

[0067] (2) For any 0≤r

[0068] As an example, the initial random permutation sequence can be set to Q = {1, 41, 21, 61, 11, 51, 31, 71, 6, 46, 26, 66, 16, 56, 36, 76, 4, 44, 24, 64, 14, 54, 34, 74, 9, 49, 29, 69, 19, 59, 39, 79, 3, 43, 23, 63, 13, 53, 33, 73, 8, 48, 28, 68, 18, 58, 38, 78, 5, 45, 25, 65, 15, 55, 35, 75, 10, 50, 30, 70, 20, 60, 40, 80, 2, 42, 22, 62, 12, 52, 32, 72, 7, 47, 27, 67, 17, 57, 37, 77}, of course, the specific setting of the initial random permutation sequence in this embodiment is not limited to this, it can be based on specific application conditions, For example, selection is made according to ...

Embodiment 3

[0069] Embodiment 3, the specific steps of the random permutation function are as follows:

[0070] For any 0≤r

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Abstract

The invention discloses a method for distributing feature codes of an E-HICH channel, which can eliminate the inequality caused by code word distribution so as to result in the use equality of the feature codes used in the E-HICH channel, thus ensuring that the average detecting performance of the feature codes becomes more equal when different UE detect the average detecting performance on the E-HICH channel, and reducing the average mistake examining ratio of received feedback information of each UE. The method includes the following steps: firstly, an E-HICH logic feature code serial number r is distributed to each UE; and a random permutation function is used for respectively converting the logic feature code serial number r into a physical feature code serial number r' changing with time; and then the feature code corresponding to the physical feature code serial number r' is distributed to each UE.

Description

technical field [0001] The invention relates to a method for distributing characteristic codes in a wireless communication system, in particular to a method for distributing characteristic codes in an E-HICH channel for sending feedback information to an E-DCH channel in a TD-SCDMA system. Background technique [0002] In the 3GPP Release7 version, for the option of 1.28Mcps (that is, the TD-SCDMA system), the High Speed ​​Uplink Packet Access (HSUPA) technology is introduced. The main feature of this technology is the introduction of an enhanced uplink dedicated transmission channel (Enhanced Dedicated Channel, E-DCH) and several related physical channels, and adopt technologies such as fast Node-B scheduling and hybrid automatic repeat request (Hybrid Automatic Repetition Request, HARQ), so that the capacity of the uplink can be greatly improved. [0003] According to whether the UE uses pre-allocated or temporary scheduling when sending uplink services, HSUPA can be divid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W72/08H04W72/54H04J13/16H04J13/18
CPCH04L1/1692H04J13/16
Inventor 张爱民陈志群师延山
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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