WO2004066651A1

WO2004066651A1 - Method and device for searching and selecting cell

Info

Publication number: WO2004066651A1
Application number: PCT/CN2003/000063
Authority: WO
Inventors: Chen Ji; Liwen Shi
Original assignee: Linkair Communications, Inc.
Priority date: 2003-01-23
Filing date: 2003-01-23
Publication date: 2004-08-05
Also published as: CN1640165A; AU2003207222A1

Abstract

The present invention provides a method and device for searching and selecting cell, by LS matching filter for input signals; LA polarity matching is processed after LS matching filter, and square and LA power combining is processed, the processed signals are processed by power profile gen; the signals of processed by power profile gen are processed by peak detection and channel detection; channel selecting is processed for the signals of channel detecting; searching and selecting cell is completed. It provides for searching whole possible cell ID sequence, detecting whole enough signals intensity cell (or section), getting the information of LS code blocks and LA interval permutation employed by objective cell (or section).

Description

Method and device for community search and selection

Technical field

The present invention relates to the field of wireless communication technologies, and in particular, to a technology for performing a cell search and detecting a cell ID (Cell ID) when a mobile station in an idle mode (connected mode) and a connected mode (connected mode) in a CDMA system. Method and device for cell search and selection. Background technique

In the CDMA system, the purpose of cell search is to find all cells / sectors with sufficient signal strength, and establish downlink synchronization with the selected cell. The business channels of different cells use different LS spreading code groups and different LA intervals. . In order for a mobile station to correctly demodulate the signal of a certain cell / sector and establish communication, it must obtain the information of the LS code group and LA interval arrangement of the cell / sector traffic channel. Therefore, in the cell search, the mobile station must search all possible cell ID sequences in the downlink synchronization physical channel, detect all cells / sectors with sufficient signal strength, and further obtain the target cell / sector usage. LS interval information. Summary of the Invention

An object of the present invention is to provide a cell search and selection method and device, which are used to search all possible cell ID sequences, detect all cells / sectors with sufficient signal strength, and obtain a target cell I Information about the LS code group and LA interval used by the sector.

The technical solution of the present invention is:

A method for cell search and selection, which is characterized by including the following steps:

Perform LS matching filtering on the input signal;

The LS matching and filtering signals are respectively processed for LA polarity matching, squaring and LA energy combining, and the processed signals are subjected to energy distribution processing (power prof i le gen);

Perform peak value detection and channel detection on the signal after energy distribution processing;

Perform channel selection on the signal after channel detection; realize cell search and selection.

The LS matched filtering includes: If defined ^-^;

Let the waveform of the LS code be (0 = c _Re (t) + jc _lm (t), 0≤t <LT _c , where Z is the length of the LS code;

Then the shock response function of LS matched filtering is:

h (t) = ¾ _Re (+ A _m (=

= c _Re (T- t)-jc _lm (T ~ t), 0≤t≤LT _c , where T = LT _C ',

Corresponds to the input signal = s _Re (0 + js _lm (; there are:

The matched filtered output signal of LS is:

Άί) ® ^ (= [½ _e (0 + (01 ® [K _e (0 + Am (01

= ½e (0 ® K _e (t)-S _lm (t) ® h _lm (+ j [s _Re (t) ® (t) + S _Im (t) ® h _Re (t)];

After performing the modulo-square operation on the output signal, the output signal is:. 'For the complex number β + _ / · &,

.

The process of performing LA polarity matching on the LS-matched and filtered signals, and combining the squared and LA energy refers to:

Different LA polarity matching and squaring can be performed on the LS matched filtered signals respectively; and squared and LA polarity matching can be performed on the LS matched filtered signals.

The LA polarity matching is a delay line with a length of ¾ channel length of the downlink synchronization object. After LA multiplication, it is multiplied with the LA polarity sequence [, a ₂ , ... a ₈ ], and then the LS symbol is used. Several adders are used to achieve LA polarity matching, where the number of LS symbols is the number of LS codes included in the downlink synchronization physical channel.

The LA energy combining is the squaring of the signal, through a delay line of the length of the downlink synchronization physical channel, and using an adder to achieve the energy combining of the LS symbols.

The energy distribution processing includes: if the input of 笫 i LS matched filters (MF) after the square operation is greater than the input from K * LA combining, then the corresponding i-th output is the i-th LS matched filter (MF) Input after squaring operation, otherwise 笫 i output is 0, where K is preset parameter.

The peak detection includes: Within each frame time, according to the initial frame boundary position obtained from the initial frame boundary detection, the search time window of the downlink synchronization physical channel is determined, and within the search time window, the peak signal strength (s _k ) of the matched filter output and the corresponding Position x _k

The determination of the search time window is as follows:

Note that the oversampling rate of each chip of the baseband digital signal is Fs. There are Nc chips in the frame time, the search time window length is Nw chips, and the LS code length is Nls chips. chip), and the LA code length is Nla chips.

The energy profile processing (Power Profile Gen) unit outputs a total of Fs * Nc samples within a superframe time, and is recorded as PowerProfile [l .. Fs * Nc];

Record the initial frame boundary position obtained by the initial frame boundary detection as: FrameBoundaryLoc;

Make sure the search time window is PowerProf ile [FrameBoundaryLoc + (Nls + Nla-Nw) * Fs .. FrameBoundaryLoc + (Nls + Nla + Nw) * Fs];

For the peak signal strength (S _k ) and the corresponding position X _k found in the search time window of each frame, a sliding observation of a sliding window of M frames is performed to obtain the current signal strength Sc of the downlink synchronization physical channel and the average frame start position Yc; is divided into the following 3 steps:

Step 1: Take ¾: i = 1,2, ..., M} is the peak signal position with sliding observation of M frames, and ^: i = 1,2, ..., M} is the corresponding peak signal. Energy, calculate all satisfies and X; the number of peak positions whose distance is less than or equal to d; that is, find all X that satisfy I Xj-Xi I <d, j = 1,2, ..., Μ ", And calculate the number of Xj. The number of corresponding peak positions is counted as C _i;

Step 2: Find Cm = max {,: i = 1,2,…, M} in M frame observation. Take the corresponding ₁ as the peak position output; if the number of peak positions C _M corresponding to the current frame X _M is greater than Or equal to Nthl, the peak signal energy of the current frame is the peak signal energy output, otherwise the peak signal energy output is -1;

Step 3: Move the sliding window to the right by one position and repeat the first step.

The channel detection includes: If Nc is greater than the preset threshold Nth2, it is considered that the corresponding downlink synchronization physical channel is detected, and {Yc, Sc} is output to the signal energy measurement and channel selector; if Nc is less than or equal to the preset threshold Nth2, it is considered Failed to detect the corresponding downlink synchronization physical channel, set Yc = -1, Sc = -1, and output {Yc, Sc} to the signal energy measurement and channel selector.

The channel selection will select one of all detected sectors as the active sector, and the mobile station will demodulate and multipath receive the signal of this sector; which sector the mobile station chooses as the active sector is The upper layer decides that the physical layer simply reports the measurement results to the upper layer;

After receiving the indication of which sector in the upper layer is the active sector, the physical layer uses the corresponding Yc- (Nls + Nla) * Fs as the starting position of the downlink frame timing of the mobile station;

The mobile station will perform multipath search, RAKE reception, and timing tracking according to the starting position of the frame timing. The invention also provides a device for cell search and selection, which includes: LS matched filter, LA polarity matching unit, square unit, LA energy combining unit, energy distribution processing unit, peak detector, channel detector, channel Selector;

Input signal input LS matched filter;

The output signals of the LS matched filter are input to the LA polarity matching unit, the square unit and the LA energy combining unit, respectively; the output signal of the square unit and the output signal of the LA energy combining unit are input to the energy distribution processing unit;

The output signal of the energy distribution processing unit is input to the peak detector; the output signal of the peak detector is input to the channel detector;

The output signal of the channel detector is input to the channel selector; the output signal of the channel selector.

The LS matched filter includes:

If defined

Let the waveform of the LS code be at) = _CRe (t) + _ / _Chem (t), 0≤t≤LT _c , where Z is the length of the LS code;

Then the impulse response function of the LS matched filter is:

Ht) = (t) + jh _Im (t) = c * (Γ-= ¾ (Γ--Jc _Im (T-1), 0≤t <LT _c , take here T = LT _C

Corresponds to the input signal? (t) = s _Re (t) + js _lm (t); _Yes :

The output signal of the matched filter of LS is:

s (t) ® t) = [5 _Re (t) + js _lm (t)] ® [h _Re (+ jh _Im (t)]

= _SRe (® (-¾ ₁ (®¾ _m (+7 [¾e (®¾ _m (+ ¾ (®¾Re (];

After performing the modulo-square operation on the output signal, the output signal is:

For the complex number b, \ a + jbf = a ² + b ^z .

The output signals of the LS matched filter are input to the LA polarity matching unit, respectively. The square unit and the LA energy combining unit include:

The output signal of the LS matched filter is input to each different LA polarity matching unit; the output signal of each different LA polarity matching unit is respectively input to each square unit;

The output signal of the LS matched filter is inputted into a square unit and a LA energy combining unit connected to the square unit.

The LA polarity matching unit includes: a delay line with a long downlink synchronization physical channel length, a tap multiplier, and an adder.

The LA energy combining unit includes: a delay line having a length of a downlink synchronization physical channel, and an adder.

The energy distribution processing unit includes: if the input of the i-th LS matched filter (MF) after the square operation is greater than the input from K * combining, then the corresponding i-th output is the i-th LS matched filter (MF) Input after squaring, otherwise the i-th output is 0, where K is the preset parameter.

The peak detector includes: determining, within each frame time, a search time window of a downlink synchronization physical channel according to an initial frame boundary position obtained by detecting an initial frame boundary, and finding a matched filter output within the search time window. The peak signal strength ( _Sk ) and the corresponding position _Xk .

The channel detector includes:

If Nc is greater than the preset threshold Nth2, it is considered that the corresponding downlink synchronization physical signal is detected Channel, output {Yc, Sc} to the signal energy measurer and channel selector; if Nc is less than or equal to the preset threshold Nth2, it is considered that the corresponding downlink synchronization physical channel cannot be detected, and set Yc =-1, Sc =-1, output {Yc, Sc} to the signal energy measurement and channel selector.

The channel selector outputs signals to a multi-channel detector and a D-DPCH receiver.

The LA polarity matching unit may be composed of adders of LS symbols.

The LA energy combining unit may be composed of adders of LS symbols.

The beneficial effect of the present invention is that by providing a cell search and selection method and device for searching all possible cell ID sequences, detecting all cells / sectors with sufficient signal strength, we obtain Information about the LS code group and LA interval used by the destination cell / sector. Downlink synchronization with the selected cell is established.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a subframe structure diagram of a downlink synchronization channel;

FIG. 2 is a block diagram of a cell searcher;

Figure 3 is a structural block diagram of the LS matched filter;

Figure 4 is a schematic diagram of a LA polarity matching unit;

Figure 5 is a schematic diagram of LA energy combining.

detailed description

The present invention provides a method and device for cell search and selection. The process and algorithm of performing a cell search and detecting a cell ID (Cel l ID) when the mobile station is in idle mode and connected mode is described in detail below with reference to the accompanying drawings.

In a TD-LAS quasi-commercial system, the structure of the downlink synchronization channel is shown in Figure 1. The downlink synchronization physical channels of all cells use the same LS spreading code (see Table 1), and different modulation symbol code groups are used to distinguish the cells. There are 8 time slots in the downlink synchronization sub-frame, and the length of each time slot is shown in Table 2. Each time slot transmits a downlink synchronization pulse with a length of 72 Chips. The downlink synchronization pulse is transmitted at the beginning of each time slot. The LS code used for the downlink synchronization channel is complex digital, and the corresponding spreading and decoding Spreading is similar to QPSK, as shown in Table 4. The 8 slots of the downlink synchronization subframe can transmit 8 modulation symbols, and a total of 8 bipolar mutually orthogonal code sequences can be obtained, such as each row or column of an 8 x 8 Walsh matrix, in a TD-LAS quasi-commercial system These code sequences are called LA polar sequences (see Table 3). 8 orthogonal LA polar sequences can support the networking of 8 cells / sectors. To support a larger network size, consider combining with other cell identification methods such as continuous pilot cell identification, or you can use Different cell / sector clusters use different LA guard intervals to expand the D-SYNPCH signal set. Table 1. Spreading code (LS code) of the downlink synchronization channel (j = V ^ T)

Where: A = (+ j ++ +-), B = (-]-+ +-), C = (-) — +), D = (--+ +-) Table 2. Frame slot length

Table 3. LA Polarity Codes for Downlink Synchronization Channels

Table 4. LA Polarity Codes for Downlink Synchronization Channels

The purpose of cell search is to find all cells / sectors with sufficient signal strength, and select Cell establishes downlink synchronization. In the TD-LAS system, the traffic channels of different cells use different LS spreading code groups and different LA intervals. In order for a mobile station to correctly demodulate the signal of a certain cell / sector and establish communication, it must obtain the information of the LS code group and LA interval arrangement of the cell / sector traffic channel. Therefore, in the cell search, the mobile station must search all possible cell ID sequences in the downlink synchronization physical channel, detect all cells / sectors with sufficient signal strength, and further obtain the target cell / sector usage. Information arranged in LS code group and LA interval.

In the TD-LAS quasi-commercial system, there are 4 sectors in total. The downlink synchronization physical channels of all cells / sectors use the same LS code and LA arrangement, but different cells / sectors have different LA modulation polarities. Therefore, the cell searcher of the mobile station only needs to use the same LS code matching filter, and then use different LA polarity matching to achieve matching filtering of the downlink synchronization physical channel of each cell / sector at the same time. The cell searcher works at speed. Figure 2 illustrates the structure of the cell searcher and the downlink synchronous matched filter.

All calculations in the algorithm description do not take into account the additional delays used by device arithmetic processing. The definition and structure of each module in the downlink synchronization receiver are introduced in detail below.

LS Matched Filter (LS Matched Fi l ter):

Definition = V ^ T

Let the LS code waveform be? (t) = c _Re (t) + jc _lm (t), 0≤t≤ 72T _C

The impulse response function of the LS matched filter is

h (t)

, Q≤t≤72T _c , where T = Ί2Ί.

Corresponds to the input signal? (t) = s _Ke (t) + js _lm (t)

LS's matched filter output signal is S t) ® (t)

= [¾ _e (0 + _{∞ (t)] <S> [/ _e (t) + jh _lm (t)]

= ¾ (® (-^ _Im (®¾ _m (+ ie (®¾ _m (+ ¾ (®¾e (]

After performing modulo-square operation on the output signal, the output signal is

For complex number jb, α + jb \ ² = a ² + b ² LA polarity matching unit:

The LA polarity matching unit is a delay line with a total length of 811Tc in the downlink synchronization physical channel. After LA multiplication, it is multiplied with the LA polarity sequence a ₂ , ... a ₈ ], and then 8 adders are used to Achieve U polarity matching. Its structure is shown in Figure 4:

The output of the LA matched filter after the square operation is the signal strength at each sampling point (here, the sampling rate is 1 / 4Tc).

The function of the LA energy combining unit is to combine the energy on each time slot of the downlink synchronization channel.

The LA energy combining unit (LA Eng combining) is a delay line with a total length of 811Tc for the downlink synchronous physical channel, and uses eight adders to achieve the energy combining of the LS symbols. Its structure is shown in Figure 5.

The functions of the Power Distribution Gen Unit (Power Prof i le Gen) are as follows:

If the input of the i-th LS MF after square operation is greater than the input from K * LA combining, then the corresponding i-th output is the input of the i-th LS MF after square operation, otherwise the i-th output is 0. Here K is the preset parameter.

The operation of the peak detector and channel detector is as follows:

Within each 24ms time, according to the initial frame boundary position obtained from the initial frame boundary detection, a search time window of the downlink synchronization physical channel is determined, and the peak signal strength (S _k ) of the matched filter output and the corresponding Position X _k

The search time window is determined as follows:

Energy distribution Gen unit (Power Prof i le Gen unit) outputs a total of 4 * 30720 samples in a superframe time, recorded as PowerProf i le tl.. 30720 * 4]

Record the initial frame boundary position obtained by the initial frame boundary detection as FrameBoundaryLoc, and determine the search time window as PowerProf i le [FraraeBoundaryLoc + 72 * 4 + 811 * 4-40 * 4.. FrameBoundaryLoc + 72 * 4 + 811 * 4 + 40 * 4]

For the peak signal strength (S _k ) and the corresponding position X _k found in the search time window of each frame, a sliding observation with a sliding window of M frames is performed to obtain the current signal strength Sc and Average frame start position Yc. It is divided into the following 3 steps:

Step 1: Take: i = 1, 2, ..., M} is the peak signal position of sliding observation of M frames, and i = 1,2, ..., M} is the corresponding peak signal energy, Calculate the number of peak positions where the distance that satisfies the sum is less than or equal to d; that is, find all Xj that satisfy I χ′-I, I <d, j = 1, 2, ..., Μ, and calculate Xj Number of. The number of peak positions corresponding to Xi is counted as C _i;

Step 2: Find Cm = max {C,: i = 1, 2, ..., M} in the M frame observation. Take the corresponding Xi as the peak position output; if it corresponds to the peak position number C of the current frame _½ _{M is} greater than or equal to Nthl, and the peak signal energy of the current frame is output as the peak signal energy, otherwise the peak signal energy is output as -1;

Note: An implementation algorithm for calculating Cm is given below:

Take Count [0: M] as a one-dimensional array holding {Ci: i = 0, 1,…, M}, and X [0: M] as a one-dimensional array holding the peak energy position of each frame output;

Xt is the peak energy position input of the current frame;

St is the peak energy input for the current frame.

Yc is output for the start position of this superframe;

Sc is the energy output of the downlink synchronous physical channel.

〃Here the elements in the array Count [0: M] are initialized to M,, the array S [] is initialized to 0, and the array X [0: M] is initialized to 0.

输出 Output detection results after M frames

For i = 1, i <M, i ++ {

II compares the input of the earliest frame with the new input

if I X [i] -X [0] I <d

Count [i]-= 1;

} Shift the array Count [] and the array X [3 from left to right to remove the oldest input.

Count [M] = 0; 〃 counter is set to 0

X [M] = X _k ; 〃 read the latest input

for i = 0, i <M, i ++

〃 Compare the new input with the input of the previous M-1 frame

if | X [i]-X [M] I <d

{

Count [i] + = 1; 〃 update the counter of the existing m-1 frame

Count [M] + = 1; Set the counter of the latest frame

}

Count [M] —; 〃 decrement the counter of the latest frame

Find the maximum value Nc in the counter array {Count [i], i = 1, ..., Μ}, and its number Ic within the array

Set the peak position in this frame to Yc = X [Ic] and peak energy St = S [Ic].

if Count [M]> Nthl

Sc = St;

else

Sc = 0; Perform downlink synchronization physical channel detection: If Nc is greater than the preset threshold Nth2, it is considered that the corresponding downlink synchronization physical channel is detected, and {{Yc, Sc} is output to the signal energy measurement and channel selector. If Nc is less than or equal to the preset threshold Nth2, it is considered that the corresponding downlink synchronization physical channel cannot be detected. Set Yc =-1, Sc = -1, and output {Yc, Sc} to the signal energy measurement and channel selector. in.

The channel selector will select one of the detected sectors as the active sector, and the mobile station will demodulate and multipath receive the signals in this sector. Which sector the mobile station chooses as the active sector is determined by the upper layer, and the physical layer simply reports the measurement result to the upper layer. After receiving the indication of which sector in the upper layer is the active sector, the physical layer

Yc-72 * 4- 811 * 4 is used as the starting position of the downlink frame timing of the mobile station. The mobile station will perform multipath search, RAKE reception, and timing tracking functions according to the starting position of the frame timing.

I / O and parameters:

Input signal: output of baseband filter, signal rate 4fc;

Frame boundary position

Output signal: the signal energy and frame start position {Yc, Sc} of all detected downlink downlink physical channels;

Parameter configuration: K = 1;

M = 10;

Nthl = 3;

Nth2 = 5.

The beneficial effect of the present invention is that by providing a cell search and selection method and device for searching all possible cell ID sequences, and detecting all cells / sectors with sufficient signal strength, we obtain Information about the LS code group and interval used by the destination cell / sector. Downlink synchronization with the selected cell is established.

Claims

Rights request

1. A method for cell search and selection, comprising the following steps:

Perform LS matching filtering on the input signal;

The LS matched and filtered signals are respectively processed by LA polarity matching, squared and LA energy combined, and the processed signals are processed by energy distribution processing;

Perform peak detection and channel detection on the signal after energy distribution processing;

2. The method according to claim 1, wherein the LS matched filtering comprises:

If defined = = ^;

And let the LS code waveform be? (t) = c _Re (t) + c _Im (t), 0≤t≤LT _c , where Z is the length of the LS code;.

Then the shock response function of LS matched filtering is:

h (t) = K (0 + A _m (0 =

= c _Re (Γ--jc _lm (Τ-1) '0≤t≤LT _c , where T = LT _C

(Corresponds to the input signal ^ + ^^);

The matched filtered output signal of LS is:

® / 7 (= [¾ (+ j _lm (t)] ® [h _Re (+ jh _im (ή) After performing modulo-square operation on the output signal, the output signal is:

For complex number b,

.

3. The method according to claim 1, wherein the processing of performing LA polarity matching on the LS-matched and filtered signals, and combining the squared and LA energy means:

Different LA polarity matching and squaring processing can be performed on the LS matched filtered signals respectively; and squared and LA polarity matching processing can be performed on the LS matched filtered signals.

4. The method according to claim 1 or 3, wherein the LA polarity matching is a delay line having a length of a downlink synchronization physical channel, and on the LA line, and the LA polarity sequence [^ , A ₂ , ... ¾] are multiplied by using LS symbol number adders to achieve LA polarity matching, where N is the number of LS symbols, that is, the number of LS codes included in the downlink synchronization physical channel.

5. The method according to claim 1, wherein the LA energy combining is a length of a long common delay line of a downlink synchronization physical channel, and the number of adders of the symbols is used to implement the energy combining of the LS symbols.

6. The method according to claim 1, wherein the energy distribution processing comprises: if the input of LSi LS matched filters after squaring operation is greater than the input from K * LA merging, then 相应 i The output of the channel is the input of the 笫 i LS matched filter after the square operation, otherwise the output of the ith channel is 0, where K is the preset parameter.

7. The method according to claim 1, wherein the detected peak detection comprises: within each frame time, determining a search time window of a downlink synchronization physical channel according to an initial frame boundary position obtained by initial frame boundary detection. , Find the peak signal strength (S _k ) and the corresponding position X _{k of the} output of the matched filter within the search time window;

The determination of the search time window is as follows:

Note that the oversampling rate of each chip of the baseband digital signal is Fs. There are Nc chips in the frame time, the search time window is Nw chips, the LS code length is Nls chips, and the LA code length is Nla. Chip.

The energy distribution processing unit outputs a total of Fs * Nc samples within one superframe time, which is denoted as PowerProf i le [1.. Fs * Nc];

Record the initial frame boundary position obtained from the initial frame boundary detection as: FrameBoundaryLoc; Determine the search time window as PowerProf i le [FrameBoundaryLoc + (Nl s + Nla-Nw) * Fs.. FrameBoundaryLoc + (Nls + Nla + Nw) * Fs] ;

For the peak signal strength (S _k ) and the corresponding position X _k found in the search time window of each frame, a sliding observation of a sliding window of M frames is performed to obtain the current signal strength Sc of the downlink synchronization physical channel and the average frame start position Yc; is divided into the following 3 steps: Step 1: Take: i = 1, 2, ..., M} is the peak signal position of the sliding observation of M frames, and i = 1, 2, ..., M} is the corresponding peak signal. Energy, calculate the number of peak positions where the distance of all satisfies is less than or equal to d; that is, find all X's that satisfy I-I ≤ d, j = 1, 2, ..., M 'and calculate X' Number of. The number of corresponding peak positions is counted as C _i;.

笫 Step 2: Find Cm = max {Cj: i = 1, 2, ..,, M} in the M frame observation, and take the corresponding Xi as the peak position output; if it corresponds to the peak position number C of the current frame X _M _{M is} greater than or equal to Nthl, and the peak signal energy of the current frame is output as the peak signal energy, otherwise the peak signal energy is output as -1;

Step 3: Move the sliding window to the right by one position and repeat the next step.

8. The method according to claim 1, wherein the channel detection comprises: if Nc is greater than a preset threshold Nth2, it is considered that a corresponding downlink synchronization physical channel is detected, and output {Yc, Sc} to Signal energy measurement and channel selector; if Nc is less than or equal to the preset threshold Nth2, it is considered that the corresponding downlink synchronization physical channel cannot be detected, set Yc--1, Sc = -1, and set {Yc, Sc} Output to signal energy measurement and channel selector.

9. The method according to claim 1, wherein, in the channel selection, one of all detected sectors is selected as an active sector, and the mobile station will demodulate and multiply signals in this sector. Path reception; which sector the mobile station chooses as the active sector is determined by the upper layer, and the physical layer simply reports the measurement results to the upper layer;

The mobile station will perform multipath search, RAKE reception, and timing tracking according to the starting position of the frame timing.

10. A device for cell search and selection, comprising: an LS matched filter, an LA polarity matching unit, a squaring unit, an LA energy combining unit, an energy distribution processing unit, a peak detector, a channel detector, and a channel selector;

Input signal input LS matched filter; The output signals of the LS matched filter are respectively input to the LA polarity matching unit, the square unit and the LA energy combining unit; the output signals of the square unit and the LA energy combining unit are input to the energy distribution processing unit;

The output signal of the it detector is input to the channel selector; the channel selector output signal.

The device according to claim 10, wherein the LS matched filter comprises:

If _ = ^ 1,

And let the LS code waveform be? (t) = c _Re (0+ jc _lm {t), ≤t≤LT _c , here is taken as the length of the LS code;

Then the impulse response function of the LS matched filter is:

Kt)

(T-1), 0≤t≤LT _c , where T is LT _C ;

Corresponds to the input signal? (0 = (0+ _ta W; yes:

The output signal of the matched filter of LS is:

? (®¾ (= (+ _ta (] ® [/% e (+ A _m (]

= ¾ (0 ® (0-¾ (0 ® (+ j [s _Re (t) ® h (t) + _Slm (0 ® h _Ke (/)];

To plural

.

12. The device according to claim 10, wherein the output signals of the LS matched filter are respectively input to a LA polarity matching unit, and a square unit and a LA energy combining unit include ··

The output signal of the LS matched filter is input to a square unit and connected to the square unit. Connected LA energy merger unit.

13. The apparatus according to claim 10 or 12, wherein the LA polarity matching unit comprises: a delay line having a length of a downlink synchronization physical channel, a tap multiplier, and an adder.

14. The apparatus according to claim 10, wherein the energy combining unit comprises: a delay line having a length of a downlink synchronization physical channel, and an adder.

15. The device according to claim 10, wherein the energy distribution processing unit comprises: if the input of the i-th LS matched filter after the square operation is greater than the input from the K * LA combination, the corresponding first The output of channel i is the input of the i-th LS matched filter after the square operation, otherwise the output of channel i is 0, where K is the preset parameter.

16. The apparatus according to claim 10, wherein the peak detector comprises: determining, within each frame time, a search for a downlink synchronization physical channel according to an initial frame boundary position obtained by initial frame boundary detection. Time window, and find the module of the peak signal strength (s _k ) of the matched filter output and the corresponding position x _k within the search time window.

17. The apparatus according to claim 10, wherein the channel detector comprises:

If Nc is greater than the preset threshold Nth2, it is considered that the corresponding downlink synchronization physical channel is detected, and {Yc, Sc} is output to the signal energy measurer and channel selector; if Nc is less than or equal to the preset threshold Nth2, then It is considered that the corresponding downlink synchronization physical channel cannot be detected. Set Yc =-1 and Sc =-1 and output {Yc, Sc) to the signal energy measurement and channel selector.

18. The apparatus according to claim 10, wherein the channel selector outputs signals to a multi-channel detector and a D-DPCH receiver.

19. The device according to claim 13, wherein the LA polarity matching unit is composed of a plurality of adders of LS symbols.

20. The apparatus according to claim 14, wherein the LA energy combining unit may be composed of a plurality of adders of LS symbols.