JP3547991B2 - Line quality estimation apparatus and method - Google Patents

Description

また、Ｉｃｈ及びＱｃｈベースバンド信号１１０，１１１の位相θ＝ａｒｃｔａｎ（Ｑ／Ｉ）と｜Ｉ｜−｜Ｑ｜との関係を図１０に示す。位相θは、上式（１）に示す近似を行うことによって、１．８度以内の誤差で生成可能である。
【０１５０】
Ｉｃｈ及びＱｃｈベースバンド信号１１０，１１１は、各々、Ｉｃｈ絶対値検出回路９０１及びＱｃｈ絶対値検出回路９０２により絶対値検出され、この検出信号９０６と９０７とが減算器９０３で減算され、この減算により得られた差分信号９０８が変換器９０４へ出力される。
【０１５１】
また、Ｉｃｈ及びＱｃｈベースバンド信号１１０，１１１は、象限判定器９０５によって、その象限が判定され、この判定により得られた象限表示信号９０９が変換器９０４へ出力される。そして、変換器９０４において、象限表示信号９０９に応じて差分信号９０８が位相変換されることによって、位相情報１１２が得られる。
【０１５２】
このように、実施の形態９によれば、回線品質推定装置に入力されるＩｃｈ及びＱｃｈベースバンド信号１１０，１１１から位相情報１１２を生成する位相情報生成器を、乗算器及びメモリによるメモリ回路１０１を用いずに構成することができるので、実施の形態１〜８の回線品質推定装置の回路規模の削減、低消費電力化を図ることができる。
【０１５３】
（実施の形態１０）
図１１は、本発明の実施の形態１０に係る回線品質推定装置に用いられる位相情報生成器のブロック図を示す。
【０１５４】
この図１１に示す位相情報生成器は、図２〜図８に示したメモリ回路２０１の代わりに用いられるものであり、大小比較器１１０１と、２ビットシフト器１１０２と、３ビットシフト器１１０３と、加算器１１０４，１１０５とを備えて構成されている。
【０１５５】
まず、Ｉｃｈ及びＱｃｈベースバンド信号１１０，１１１の位相と包絡線情報Ｚにおいては、次式（２）に示す近似が成り立つ。
【０１５６】
｜Ｉ｜＞｜Ｑ｜の場合
Ｚ＝｜Ｉ｜＋０．３７５×｜Ｑ｜
｜Ｑ｜＞｜Ｉ｜の場合
Ｚ＝｜Ｑ｜＋０．３７５×｜Ｉ｜
但し、０．３７５は、ビットシフトを実現可能とする係数である。即ち、０．３７５の乗算はビットシフトで実現可能である。
【０１５７】
また、Ｉｃｈ及びＱｃｈベースバンド信号１１０，１１１位相θと包絡線情報Ｚの関係を図１２に示す。Ｚは上式（２）に示す近似を行うことによって、７％以内の誤差で生成可能である。
【０１５８】
Ｉｃｈ及びＱｃｈベースバンド信号１１０，１１１は、大小比較器１１０１によって、その大小が比較されることにより、｜Ｉ｜＞｜Ｑ｜の場合は｜Ｉ｜を示し、｜Ｑ｜＞｜Ｉ｜の場合は｜Ｑ｜を示す大小比較結果信号１１０６が得られ、加算器１１０５と、２ビットシフト器１１０２及び３ビットシフト器１１０３へ出力される。
【０１５９】
２ビットシフト器１１０２及び３ビットシフト器１１０３では、各々、２ビットシフト、３ビットシフトされ、これらシフトされた信号１１０７，１１０８が加算器１１０４で加算され、この加算信号１１０９と大小比較結果信号１１０６とが、加算器１１０５で加算されることによって、包絡線情報２０７が得られる。
【０１６０】
このように、実施の形態１０によれば、回線品質推定装置に入力されるＩｃｈ及びＱｃｈベースバンド信号１１０，１１１から包絡線情報２０７を生成する包絡線情報生成器を、乗算器及びメモリによるメモリ回路２０１を用いずに構成することができるので、実施の形態２〜８の回線品質推定装置の回路規模の削減、低消費電力化を図ることができる。
【０１６１】
【発明の効果】
以上の説明から明らかなように、本発明によれば、Ｉｃｈ及びＱｃｈベースバンド信号のエラーパルスの検出領域に存在する正しい信号がカウントされる比率が減少するので、エラーパルスの最大カウント数と最小カウント数との差である各バースト間のエラーパルスカウント数のバラツキを低減することができ、これによって、高精度な回線品質推定を行うことができる。
【図面の簡単な説明】
【図１】本発明の実施の形態１に係る回線品質推定装置のブロック図
【図２】本発明の実施の形態２に係る回線品質推定装置のブロック図
【図３】本発明の実施の形態３に係る回線品質推定装置のブロック図
【図４】本発明の実施の形態４に係る回線品質推定装置のブロック図
【図５】本発明の実施の形態５に係る回線品質推定装置のブロック図
【図６】本発明の実施の形態６に係る回線品質推定装置のブロック図
【図７】本発明の実施の形態７に係る回線品質推定装置のブロック図
【図８】本発明の実施の形態８に係る回線品質推定装置のブロック図
【図９】本発明の実施の形態９に係る回線品質推定装置に用いられる位相情報生成器のブロック図
【図１０】実施の形態９における位相情報生成器の理論計算結果図
【図１１】本発明の実施の形態１０に係る回線品質推定装置に用いられる包絡線情報生成器のブロック図
【図１２】実施の形態１０における包絡線情報生成器の理論計算結果図
【図１３】従来の回線品質推定装置のブロック図
【符号の説明】
１０１，２０１ メモリ回路
１０６，１０７，６０１，７０１ 一致検出器
１０８，２０６ アンド回路
１０９ カウンタ
２０３ 絶対値検出器
２０５，３０２，８０２ 判定器
３０３，４０１，５０１ 選択スイッチ
６０２，７０２，８０３ オア回路
９０１ Ｉｃｈ絶対値検出回路
９０２ Ｑｃｈ絶対値検出回路
９０４ 変換器
９０５ 象限判定器
１１０１ 大小比較器
１１０２ ２ビットシフト器
１１０３ ３ビットシフト器
１１０４，１１０５ 加算器[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a channel quality estimating apparatus applied to a radio receiver system such as digital mobile communication and a method thereof.
[0002]
[Prior art]
Conventionally, a channel quality estimating apparatus performs channel quality estimation by counting error pulses between bursts of a received signal.
[0003]
FIG. 13 shows a block diagram of a conventional channel quality estimation device. The line quality estimating apparatus shown in FIG. 13 includes a memory circuit 1301, a delay unit 1302, a subtractor 1303, a coincidence detector 1304, and a counter 1305.
[0004]
The memory circuit 1301 is obtained by calculating an arc tangent (arctan) of an I-channel baseband signal (hereinafter, Ich baseband signal) 1306 and a Q-channel baseband signal (hereinafter, Qch baseband signal) 1307. The phase information is stored, and the stored phase information 1308 is output to the delay unit 1302 and the subtractor 1303.
[0005]
Delay device 1302 delays phase information 1308 by one symbol period, and outputs the delayed phase information 1309 to subtractor 1303. The subtractor 1303 obtains the differential detection signal 1310 by subtracting the delay phase information 1309 of one symbol before from the current phase information 1308, and outputs the differential detection signal 1310 to the coincidence detector 1304.
[0006]
The coincidence detector 1304 compares the differential detection signal 1310 with an error pulse generation area display signal REF1 indicating an error pulse generation area, and when they match, generates an error pulse 1312 and outputs it to the counter 1305.
[0007]
The counter 1305 obtains a count value 1313 of the error pulse from the error pulse 1312 by counting the number of error pulses during one burst of the received signal.
[0008]
[Problems to be solved by the invention]
However, in the above-described conventional channel quality estimation apparatus, when the differential detection signal 1310 and the error pulse generation area display signal REF1 indicating the error pulse generation area coincide with each other, the error pulse 1312 is generated and counted. In accordance with the error pulse generation region, a signal having the first threshold value of the phase in which both the erroneous signal and the erroneous signal are present is counted, so that the actually erroneous signal is also counted. For this reason, the count number of error pulses varies between bursts, and the line quality estimation accuracy decreases.
[0009]
SUMMARY OF THE INVENTION An object of the present invention is to provide a channel quality estimating apparatus and method capable of performing highly accurate channel quality estimation by reducing variation in the count number of error pulses between bursts of a received signal. .
[0010]
[Means for Solving the Problems]
The present invention has the following configurations in order to solve the above-mentioned problems.
[0013]
Claim 1 The described channel quality estimating apparatus comprises: first storage means for generating and storing phase information of Ich and Qch baseband signals; and delaying the phase information by one symbol period. After subtracting from the current phase information First coincidence detecting means for outputting a first error pulse when the one-symbol delayed detection signal coincides with the first error-pulse generation region, and delaying the phase information by two symbol periods After subtracting from the current phase information When the two-symbol differential detection signal coincides with the second error pulse generation region, a second coincidence detecting means for outputting a second error pulse, and an AND operation of the first and second error pulses are performed. Accordingly, a configuration is provided that includes AND means for outputting a third error pulse indicating an error in the Ich and Qch baseband signals, and counting means for counting the third error pulse.
[0014]
According to this configuration, the ratio of counting the correct signals present in the error pulse detection region of the Ich and Qch baseband signals is reduced, so that the difference between each burst which is the difference between the maximum count and the minimum count of the error pulse is reduced. Variations in the number of error pulse counts can be reduced, so that highly accurate channel quality estimation can be performed.
[0015]
Claims 2 The line quality estimating device described in the claims 1 In the above described channel quality estimating apparatus, a second storage means for generating and storing envelope information of Ich and Qch baseband signals, and an absolute value for detecting an absolute value of a difference between the envelope information and an envelope reference value. Value detection means, when the absolute value exceeds a first threshold value for detecting an error in the envelope information, determines that the envelope information is erroneous, and outputs a level signal corresponding to this determination. A first determining unit for outputting the third error pulse to the counting unit according to a result of a logical product operation including the level signal in the first and second error pulses.
[0016]
According to this configuration, when the first and second error pulses are supplied only while the level signal indicating that the envelope information is erroneous is supplied to the AND means, the third error pulse is sent to the counting means. Output. In other words, the logical product means does not output the third error pulse to the counting means even if the first and second error pulses are supplied while the level signal indicating that the envelope information is correct is provided. As a result, the rate at which correct signals existing in the error pulse detection region of the Ich and Qch baseband signals pass through the AND means is reduced, and the variation in the number of error pulse counts between bursts is reduced. Further Therefore, it is possible to perform more accurate channel quality estimation.
[0017]
Claims 3 The line quality estimating device described in the claims 1 Or claims 2 In the above described line quality estimating apparatus, the count value is calculated based on a difference between a count value indicating the number of error pulses of the counting means and a second threshold value for suppressing variation in the number of error pulses to an appropriate value. A second determining means for determining whether or not a threshold value has been exceeded; and a first control for varying a first error pulse generation region so that the count value becomes an appropriate value in accordance with a determination result of the second determining means. And means.
[0018]
With this configuration, variations in the number of error pulse counts between bursts can be reduced. Further Therefore, it is possible to perform more accurate channel quality estimation.
[0019]
Claims 4 The line quality estimating device described in the claims 3 In the line quality estimating apparatus described above, the first control means controls the control to narrow the first error pulse generation area when the result of the determination by the second determination means indicates that the count value has exceeded the second threshold value. Is performed.
[0020]
With this configuration, when the count value indicates that the value exceeds the second threshold value, the ratio of counting correct signals existing in the first error pulse generation area decreases, and the current error pulse number is large and the The proper count value becomes the proper value.
[0021]
Claims 5 The above described line quality estimating apparatus is characterized in that Or Claim 4 The line quality estimating apparatus according to any one of the above, further comprising: a second control unit that varies a second error pulse generation region so that the count value becomes an appropriate value in accordance with a determination result of the second determination unit. And
[0022]
With this configuration, variations in the number of error pulse counts between bursts can be reduced. Further Therefore, it is possible to perform more accurate channel quality estimation.
[0023]
Claims 6 The line quality estimating device described in the claims 5 In the channel quality estimating apparatus described above, the second control means, when the determination result of the second determination means indicates that the count value has exceeded the second threshold value, controls to narrow the second error pulse generation region. Is performed.
[0024]
According to this configuration, when the count value indicates that the count value has exceeded the second threshold value, the ratio of counting correct signals existing in the second error pulse generation area decreases, and the current error pulse number is large and the The proper count value becomes the proper value.
[0025]
Claims 7 The above described line quality estimating apparatus is characterized in that: 6 In the channel quality estimating apparatus according to any one of the first to third aspects, the first determination means is used to determine an error in the envelope information so that the count value becomes an appropriate value in accordance with the determination result of the second determination means. Third control means for changing one threshold value is provided.
[0026]
With this configuration, the first threshold value for detecting an error in the envelope information is variable, so that the variation in the number of error pulses between bursts can be reduced. Further Therefore, the channel quality can be estimated with higher accuracy.
[0027]
Claims 8 The line quality estimating device described in the claims 7 In the channel quality estimating apparatus described above, the third control means, when the determination result of the second determination means indicates that the count value has exceeded the second threshold value, the envelope indicated by the first threshold value The configuration is such that the value for detecting information errors is increased.
[0028]
With this configuration, when the count value exceeds the second threshold value, the value for detecting an error in the envelope information indicated by the first threshold value is increased. Because , The rate at which the correct signals existing in the first and second error pulse generation areas are counted is reduced, so that the count value that is incorrect because the current number of error pulses is large becomes an appropriate value.
[0029]
Claims 9 The line quality estimating device described in the claims 2 In the above described channel quality estimating apparatus, a third coincidence detecting means for outputting a fourth error pulse when the one-symbol differential detection signal coincides with a third error pulse generation area narrower than the first error pulse generation area; A logical OR operation of performing an OR operation on the error pulse and the fourth error pulse, and outputting an error pulse obtained as a result to the counting unit.
[0030]
With this configuration, in the one-symbol differential detection signal, two types of large and small error pulse generation regions are set, and when the one-symbol differential detection signal also exists in the smaller error pulse generation region, an error pulse is generated. The variation in the number of error pulse counts between bursts. Further Therefore, the channel quality can be estimated with higher accuracy.
[0031]
Claims 10 The line quality estimating device described in the claims 9 4. The line quality estimating apparatus according to claim 1, further comprising: fourth coincidence detecting means for outputting a fifth error pulse when the two-symbol differential detection signal coincides with a fourth error pulse generation region narrower than the second error pulse generation region, The OR means performs a logical OR operation of the third and fourth error pulses and the fifth error pulse, and outputs the resulting error pulse to the counting means.
[0032]
With this configuration, also in the two-symbol differential detection signal, two types of large and small error pulse generation areas are set, and when the two-symbol differential detection signal also exists in the smaller error pulse generation area, an error pulse is generated. The variation in the number of error pulse counts between bursts. Further Therefore, the channel quality can be estimated with higher accuracy.
[0033]
Claims 11 The line quality estimating device described in the claims 10 In the channel quality estimating apparatus described above, the absolute value of the difference between the envelope information detected by the absolute value detecting means and the reference value of the envelope is larger than a first threshold value for detecting an error in the envelope information. The envelope information is determined to be erroneous when the third threshold value is smaller than the third threshold value, and a third determination means for outputting a level signal corresponding to the determination is provided. The logical sum of the error pulse and the level signal is calculated, and the resulting error pulse is output to the counting means.
[0034]
With this configuration, two types of thresholds for detecting errors in the envelope information are set, and an error pulse is generated when an error in the envelope information is determined using the smaller threshold. The error pulse count between each burst Further Therefore, the channel quality can be estimated with higher accuracy.
[0035]
Claims 12 The line quality estimating device described in the claims 1 Or claim 11 In the channel quality estimating apparatus according to any one of the above, instead of the first storage means, Ich and Qch absolute value detection means for detecting absolute values of Ich and Qch baseband signals, and a quadrant of the Ich and Qch baseband signals. Phase information generating means comprising: a quadrant judging means for judging; and a converting means for converting the detected Ich and Qch absolute value signals into phase information according to the quadrant obtained by the judgment. Configuration.
[0036]
According to this configuration, the phase information generating unit that generates the phase information from the Ich and Qch baseband signals input to the channel quality estimating apparatus can be configured with a simple circuit without using the first storage unit. It is possible to reduce the circuit scale of the estimation device and reduce power consumption.
[0037]
Claims Thirteen The line quality estimating device described in the claims 2 Or claim 12 In the channel quality estimating device according to any one of the above, instead of the second storage unit, a magnitude comparison unit that compares absolute values of the Ich and Qch baseband signals and outputs a magnitude comparison result signal indicating a larger signal, Shift means for shifting the magnitude comparison result signal by M and N bits; first addition means for adding the M and N-bit shifted signals; and a summation result of the first addition means and the magnitude comparison result signal. And an envelope information generating means including a second adding means for obtaining envelope information by adding.
[0038]
With this configuration, the envelope information generation unit that generates the envelope information from the Ich and Qch baseband signals input to the channel quality estimation device can be configured with a simple circuit without using the second storage unit. The circuit scale of the line quality estimating apparatus can be reduced, and power consumption can be reduced.
[0039]
Claims 14 The base station device described in claims 1 to Thirteen The configuration using the line quality estimation device according to any one of the above.
[0040]
According to this configuration, in the base station apparatus, claims 1 to Thirteen The effect described in any of the above is obtained.
[0041]
Claims Fifteen The mobile station device described in claims 1 to Thirteen The configuration using the line quality estimation device according to any one of the above.
[0042]
According to this configuration, in the mobile station device, claims 1 to Thirteen The effect described in any of the above is obtained.
[0043]
Claims 16 The mobile communication system according to any one of claims 1 to Thirteen The channel quality estimating device according to any one of the above is used for a base station device or a mobile station device.
[0044]
According to this configuration, the base station apparatus or the mobile station apparatus in the mobile communication system has the following features. Thirteen The effect described in any of the above is obtained.
[0045]
In addition, 17 The described channel quality estimating method is to delay the phase information of the Ich and Qch baseband signals by one and two symbol periods. After subtracting from the current phase information When the one- and two-symbol differential detection signals coincide with the first and second error pulse generation regions, both error pulses are detected, and the Ich and Qch baseband signals are determined according to the result of the logical product of the two error pulses. The error pulse indicating the error of the above is counted.
[0046]
According to this method, the ratio of counting the correct signals existing in the error pulse generation region of the Ich and Qch baseband signals is reduced, so that the error between each burst, which is the difference between the maximum count number and the minimum count number of error pulses, Variations in the pulse count can be reduced, which allows highly accurate channel quality estimation.
[0047]
Claims 18 The described channel quality estimation method stores phase information of Ich and Qch baseband signals, and delays the stored phase information by one symbol period. After subtracting from the current phase information Detecting a first error pulse when the one-symbol delayed detection signal coincides with the first error pulse generation region, and delaying the stored phase information by two symbol periods; After subtracting from the current phase information When the two-symbol differential detection signal matches the second error pulse generation region, a second error pulse is detected, and the Ich and Qch baseband signals obtained by performing a logical AND operation of the first and second error pulses are obtained. A third error pulse indicating an error is counted.
[0048]
According to this method, the ratio of counting correct signals existing in the error pulse detection region of the Ich and Qch baseband signals is reduced. Variations in the number of error pulse counts can be reduced, so that highly accurate channel quality estimation can be performed.
[0049]
Claims 19 The described line quality estimation method 18 In the described channel quality estimation method, the envelope information of the Ich and Qch baseband signals is stored, and the absolute value of the difference between the stored envelope information and the reference value of the envelope is detected. When the value exceeds a first threshold value for detecting an error in the envelope information, it is determined that the envelope information is erroneous, and the first determination result is converted into first and second error pulses. The third error pulse obtained by performing the AND operation including the above is counted.
[0050]
According to this method, the rate at which correct signals existing in the error pulse detection regions of the Ich and Qch baseband signals are reduced, so that the variation in the number of error pulses between bursts can be further reduced. Accordingly, more accurate channel quality estimation can be performed.
[0051]
Claims 20 The described line quality estimation method 18 Or claims 19 In the line quality estimation method described above, the count value is calculated based on a difference between a count value indicating the number of error pulses of the counting means and a second threshold value for suppressing variation in the number of error pulses to an appropriate value. It is determined whether or not the threshold value has been exceeded, and the first error pulse generation region is varied according to the result of the second determination so that the count value becomes an appropriate value.
[0052]
With this method, it is possible to further reduce the variation in the number of error pulses counted between bursts, and to perform more accurate channel quality estimation.
[0053]
Claims 21 The described line quality estimation method 20 In the described channel quality estimation method, the first error pulse generation region is narrowed when the second determination result indicates that the count value has exceeded the second threshold value.
[0054]
According to this method, when the count value exceeds the second threshold value, the ratio of correct signals present in the first error pulse generation area is reduced, so that the current error pulse number is large and the The proper count value becomes the proper value.
[0055]
Claims 22 The described line quality estimation method 19 Or claim 21 In the channel quality estimating method according to any one of the above, the second error pulse generation region is varied according to the second determination result so that the count value becomes an appropriate value.
[0056]
According to this method, it is possible to further reduce the variation in the number of error pulses counted between bursts, and to thereby perform more accurate channel quality estimation.
[0057]
Claims 23 The line quality estimation method described is The line quality estimation method according to claim 22, When the second determination result indicates that the count value has exceeded the second threshold value, the second error pulse generation region is narrowed.
[0058]
According to this method, when the count value exceeds the second threshold value, the ratio of counting the correct signal present in the second error pulse generation area decreases, and the current error pulse number is large and the error signal is not counted. The proper count value becomes the proper value.
[0059]
Claims 24 The line quality estimation method described is In the channel quality estimation method according to any one of claims 19 to 23, According to the second determination result, the first threshold value used for determining the error of the envelope information is varied so that the count value becomes an appropriate value.
[0060]
According to this method, the first threshold value for detecting an error in the envelope information can be varied, so that the variation in the number of error pulses between bursts can be further reduced, thereby providing a more accurate Channel quality estimation can be performed.
[0061]
Claims 25 The described line quality estimation method 24 In the channel quality estimation method described above, when the second determination result indicates that the count value has exceeded the second threshold value, a value for detecting an error in the envelope information indicated by the first threshold value is set. I made it bigger.
[0062]
According to this method, when the count value exceeds the second threshold value, the value for detecting an error in the envelope information indicated by the first threshold value is increased. Because , The rate at which the correct signals existing in the first and second error pulse generation areas are counted is reduced, so that the count value that is incorrect because the current number of error pulses is large becomes an appropriate value.
[0063]
Claims 26 The described line quality estimation method 19 In the channel quality estimation method described above, a fourth error pulse is output when the one-symbol differential detection signal matches a third error pulse generation area narrower than the first error pulse generation area, and the third error pulse and the third error pulse are output. A logical OR operation with four error pulses is performed, and the resulting error pulses are counted.
[0064]
According to this method, two types of large and small error pulse generation areas are set in the one-symbol differential detection signal, and an error pulse is generated when the one-symbol differential detection signal also exists in the smaller error pulse generation area. In addition, it is possible to further reduce the variation in the number of error pulse counts between bursts, thereby enabling more accurate channel quality estimation.
[0065]
Claims 27 The described line quality estimation method 26 In the channel quality estimation method described above, a fifth error pulse is output when the two-symbol differential detection signal matches a fourth error pulse generation area narrower than the second error pulse generation area, and the third and fourth error pulses are output. The logical OR operation with the fifth error pulse is performed, and the resulting error pulses are counted.
[0066]
According to this method, two types of error pulse generation areas are set in the two-symbol differential detection signal, and when the two-symbol differential detection signal also exists in the smaller error pulse generation area, an error pulse is generated. In addition, it is possible to further reduce the variation in the number of error pulse counts between bursts, thereby enabling more accurate channel quality estimation.
[0067]
Claims 28 The described line quality estimation method 27 In the above described channel quality estimating method, an absolute value of a difference between the envelope information detected by the absolute value detecting means and a reference value of the envelope is larger than a first threshold value for detecting an error in the envelope information. Is smaller than the third threshold value, it is determined that the envelope information is erroneous, and a logical sum operation of the level signal corresponding to this determination and the third to fifth error pulses is performed, and the result is obtained. Error pulses are now counted.
[0068]
According to this method, two types of thresholds for detecting an error in the envelope information are set, and an error pulse is generated when an error in the envelope information is determined using the smaller threshold. As a result, it is possible to further reduce the variation in the number of error pulses counted between bursts, thereby enabling more accurate channel quality estimation.
[0069]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the channel quality estimation device of the present invention will be specifically described with reference to the drawings.
[0070]
(Embodiment 1)
FIG. 1 shows a block diagram of a channel quality estimation apparatus according to Embodiment 1 of the present invention. However, the channel quality estimating device is applied to a base station device or a mobile station device in a digital mobile communication system.
[0071]
A feature of the first embodiment is that the channel quality estimation is performed by using both the one-symbol differential detection signal and the two-symbol differential detection signal, so that a more accurate channel quality estimation than before can be performed. It was done.
[0072]
The line quality estimating apparatus 100 shown in FIG. 1 includes a memory circuit 101, a delay unit 102, a two delay unit 103, subtractors 104 and 105, coincidence detectors 106 and 107, an AND circuit 109, a counter 109, It is configured with.
[0073]
In such a configuration, the memory circuit 101 stores phase information obtained by calculating an arc tangent (arctan) of the Ich baseband signal 110 and the Qch baseband signal 111, and stores the stored phase information 112. The signals are output to the delay unit 102, the two delay units 103, and the subtractors 104 and 105.
[0074]
Delay device 102 delays phase information 112 by one symbol period, and outputs delayed phase information 113 to subtractor 104. The subtracter 104 obtains the one-symbol differential detection signal 114 by subtracting the one-symbol delay phase information 113 from the current phase information 112, and outputs the delayed detection signal 114 to the coincidence detector 106.
[0075]
The coincidence detector 106 compares the differential detection signal 114 with an error pulse generation area display signal REF1 indicating an error pulse generation area, and when they match, generates an error pulse 115 and outputs the error pulse 115 to the AND circuit 108.
[0076]
Two-delay device 103 delays phase information 112 by two symbol periods, and outputs two-delay phase information 116 to subtractor 105. The subtracter 105 obtains a two-symbol delayed detection signal 117 by subtracting the two-symbol delayed phase information 116 two symbols earlier from the current phase information 112, and outputs the delayed detection signal 117 to the coincidence detector 107.
[0077]
The coincidence detector 107 compares the differential detection signal 117 with the error pulse generation area display signal REF2, and when they match, generates an error pulse 118 and outputs it to the AND circuit 108.
[0078]
The AND circuit 108 obtains an error pulse 119 when both the one-symbol delayed detection signal 114 and the two-symbol delayed detection signal 117 are used by performing a logical product operation of the error pulses 115 and 118. 119 is output to the counter 109.
[0079]
The counter 109 counts the number of error pulses during one burst from the error pulse 119 to obtain a count value 120 of the error pulse.
[0080]
As described above, according to the first embodiment, the error pulse 115 obtained from the one-symbol differential detection signal 114 and the error pulse 118 obtained from the two-symbol differential detection signal 117 are AND-ed to actually generate the error pulse. Is configured to limit the area in which is detected.
[0081]
With this configuration, the rate at which correct signals existing in the error pulse detection area are counted is reduced, so that the error pulse count between each burst, which is the difference between the maximum count and the minimum count of error pulses, is reduced. Variations in the numbers can be reduced, and thereby more accurate channel quality estimation can be performed than in the past.
[0082]
(Embodiment 2)
FIG. 2 shows a block diagram of a channel quality estimation device according to Embodiment 2 of the present invention. However, in the second embodiment shown in FIG. 2, portions corresponding to the respective portions of the first embodiment in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
[0083]
A feature of the second embodiment is that channel quality estimation is performed using the envelope signals of the Ich and Qch baseband signals, thereby performing more accurate channel quality estimation than in the first embodiment. is there.
[0084]
The second embodiment shown in FIG. 2 is different from the first embodiment in that, in addition to the components of the first embodiment, a memory circuit 201, a subtractor 202, an absolute value detector 203, and a subtractor 204 And a decision unit 205, and a three-input type AND circuit 206 instead of the two-input type AND circuit 108.
[0085]
In such a configuration, the memory circuit 201 stores the envelope information obtained by calculating the square root obtained by adding the square values of the Ich and Qch baseband signals 110 and 111, and stores the stored envelope. The information 207 is output to the subtractor 202. The subtracter 202 subtracts the reference value 208 of the envelope information from the envelope information 207, and outputs an envelope information difference signal 209 indicating the difference between the two to the absolute value detector 203.
[0086]
The absolute value detector 203 detects the absolute value of the envelope information difference signal 209 and outputs the absolute value 210 to the subtractor 204. The subtracter 204 subtracts a threshold value 211 for detecting an error in the envelope information from the absolute value 210, and outputs a signal 212 indicating the result of the subtraction to the determiner 205.
[0087]
The determiner 205 determines from the signal 212 whether the absolute value 210 has exceeded the threshold value 211 and outputs a signal 213 indicating the determination result to the AND circuit 206.
[0088]
That is, if the absolute value 210 indicating the difference between the envelope information 207 and the reference value 208 exceeds the threshold value 211, it is determined that the envelope information 207 of the Ich and Qch baseband signals 110 and 111 is incorrect. The determination result data 213 at the “H” level shown is output to the AND circuit 206, and if not, the determination result data 213 at the “L” level indicating that the envelope information 207 is correct is output to the AND circuit 206.
[0089]
In the AND circuit 206, if the determination result data 213 indicates that the envelope information 207 is correct, "L" is input. Even if the error pulses 115 and 118 are input erroneously at this time, The “L” error pulse 214 is output to the counter 109, thereby preventing the counter 109 from counting error pulses indicating an error even though the received signal is correct.
[0090]
As described above, according to the second embodiment, in addition to the one-symbol differential detection signal and the two-symbol differential detection signal, the envelope signal is also used for the channel quality estimation, thereby reducing the variation in the number of error pulses counted between bursts. It is possible to further reduce the channel quality as compared with the first embodiment, and thereby, it is possible to perform more accurate channel quality estimation than the first embodiment.
[0091]
(Embodiment 3)
FIG. 3 shows a block diagram of a channel quality estimation device according to Embodiment 3 of the present invention. However, in the third embodiment shown in FIG. 3, portions corresponding to the respective portions of the second embodiment in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted.
[0092]
A feature of the third embodiment is that a more accurate channel quality estimation than in the second embodiment can be performed by making the error pulse generation area variable in the one-symbol differential detection signal. is there.
[0093]
The third embodiment shown in FIG. 3 is different from the second embodiment in that the third embodiment includes a subtractor 301, a decision unit 302, and a selection switch 303 in addition to the components of the second embodiment. It is in.
[0094]
In such a configuration, the subtractor 301 subtracts the threshold value 304 for suppressing the variation in the number of error pulses to an appropriate value from the count value 120 indicating the number of error pulses output from the counter 109, and this subtraction result The signal 305 is output to the decision unit 302.
[0095]
The determiner 302 determines from the subtraction result signal 305 whether the count value 120 exceeds the threshold value 304 and is incorrect because the number of error pulses is large, or whether the count value is equal to or less than the threshold value 304 and the error pulse number is appropriate. Then, a control signal 306 indicating this determination result is output to the selection switch 303.
[0096]
The selection switch 303 displays an error pulse generation area indicating that the error pulse generation area is narrower than the error pulse generation area display signal REF1 when the supplied control signal 306 indicates that the number of error pulses is inappropriate. The signal REF1a is selected and output to the coincidence detector 106. On the other hand, when the control signal 306 indicates that the number of error pulses is appropriate, the control unit 306 selects the error pulse generation region display signal REF1 and outputs the signal to the coincidence detector 106.
[0097]
When the error pulse generation area display signal REF1a is supplied to the coincidence detector 106, the ratio of counting correct signals existing in the error pulse detection area decreases, and the current error pulse number is large and the Is the proper value.
[0098]
On the other hand, when the error pulse generation area display signal REF1 is supplied, the error pulse 115 detected from the one-symbol delayed detection signal 114 is used as it is according to the signal REF1 because the current number of error pulses is appropriate. Output to 206.
[0099]
As described above, according to the third embodiment, by making the signal representing the error pulse generation region in the one-symbol differential detection signal variable, the variation in the number of error pulses between bursts can be further reduced than in the second embodiment. Thus, the channel quality can be estimated with higher accuracy than in the second embodiment.
[0100]
(Embodiment 4)
FIG. 4 shows a block diagram of a channel quality estimation device according to Embodiment 4 of the present invention. However, in the fourth embodiment shown in FIG. 4, portions corresponding to those in the third embodiment shown in FIG. 3 are denoted by the same reference numerals, and description thereof is omitted.
[0101]
The feature of the fourth embodiment is that, in addition to the one-symbol differential detection signal, the error-pulse generation region is variable in the two-symbol differential detection signal, thereby achieving more accurate channel quality estimation than in the third embodiment. The point is that you can do it.
[0102]
The fourth embodiment shown in FIG. 4 is different from the third embodiment in that the fourth embodiment includes a selection switch 401 in addition to the components of the third embodiment.
[0103]
In such a configuration, when the supplied control signal 306 indicates that the number of error pulses is inappropriate, the selection switch 401 determines that the error pulse generation area is narrower than the error pulse generation area display signal REF2. The selected error pulse generation area display signal REF2a is output to the coincidence detector 107. On the other hand, when the control signal 306 indicates that the number of error pulses is appropriate, the error pulse generation area display signal REF2a is selected and output to the coincidence detector 107.
[0104]
When the error pulse generation area display signal REF7a is supplied to the coincidence detector 107, the ratio of correct signals present in the error pulse detection area is reduced. Is the proper value.
[0105]
On the other hand, when the error pulse generation area display signal REF2 is supplied, the error pulse 118 detected from the two-symbol delayed detection signal 117 is used as it is according to the signal REF2 because the current number of error pulses is appropriate. Output to 206.
[0106]
As described above, according to the fourth embodiment, in addition to the one-symbol differential detection signal, the signal representing the error pulse generation region in the two-symbol differential detection signal is made variable, so that the error pulse count number between bursts varies. Can be further reduced as compared with the third embodiment, and thereby more accurate channel quality estimation than the third embodiment can be performed.
[0107]
(Embodiment 5)
FIG. 5 shows a block diagram of a channel quality estimation device according to Embodiment 5 of the present invention. However, in the fifth embodiment shown in FIG. 5, portions corresponding to the respective portions of the fourth embodiment in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted.
[0108]
The feature of the fifth embodiment is that, in addition to making the signal representing the error pulse generation region in the one-symbol differential detection signal and the two-symbol differential detection signal variable, a threshold for detecting an error in the envelope information is set. By making it variable, it is possible to perform more accurate channel quality estimation than in the fourth embodiment.
[0109]
The fifth embodiment shown in FIG. 5 is different from the fourth embodiment in that the fifth embodiment is provided with a selection switch 501 in addition to the components of the fourth embodiment.
[0110]
In such a configuration, when the supplied control signal 306 indicates that the number of error pulses is inappropriate, the selection switch 501 is more than the threshold value 211 for detecting an error in the envelope information. The large threshold value 502 is selected and output to the subtractor 204. That is, each threshold value has a relationship of 211 <502.
[0111]
As a result, the subtractor 204 subtracts the threshold value 502 from the absolute value 210 of the difference between the envelope information 207 and the reference value 208 of the envelope information, and outputs a signal 212 indicating the subtraction result to the determiner 205. .
[0112]
The determiner 205 determines from the signal 212 whether the absolute value 210 has exceeded the threshold value 502 and outputs a signal 213 indicating the determination result to the AND circuit 206.
[0113]
In other words, even if the absolute value 210 indicating an error in the envelope information 207 is large because the threshold value 502 is increased, the determiner 205 determines that the absolute value 210 is correct, and determines that the envelope information 207 is correct. Is output to the AND circuit 206, so that the pass band of the error pulse is narrowed accordingly.
[0114]
As a result, the ratio of counting the correct signal present in the pass band of the error pulse decreases, and the count value 120, which is large and the number of error pulses is incorrect, becomes the appropriate value.
[0115]
As described above, according to the fifth embodiment, in addition to making the signal representing the error pulse generation region in the one-symbol differential detection signal and the two-symbol differential detection signal variable, the method for detecting an error in the envelope information is performed. By making the threshold variable, it is possible to further reduce the variation in the number of error pulses between bursts as compared with the third embodiment, thereby achieving a more accurate channel quality estimation than the fourth embodiment. It can be carried out.
[0116]
(Embodiment 6)
FIG. 6 shows a block diagram of a channel quality estimating apparatus according to Embodiment 6 of the present invention. However, in the sixth embodiment shown in FIG. 6, portions corresponding to the respective portions of the second embodiment in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted.
[0117]
The feature of the sixth embodiment is that, in the one-symbol differential detection signal, two types of large and small error pulse generation areas are set, and when the one-symbol differential detection signal also exists in the smaller error pulse generation area, the error pulse is generated. This is to make it possible to perform more accurate channel quality estimation than in the second embodiment.
[0118]
The sixth embodiment shown in FIG. 6 differs from the configuration of the second embodiment in that a coincidence detector 601 and an OR circuit 602 are provided in addition to the components of the second embodiment.
[0119]
In such a configuration, the coincidence detector 601 is supplied with the one-symbol delayed detection signal 114 and the error pulse generation area display signal REF1b indicating that the error pulse generation area is narrower than the error pulse generation area display signal REF1. It has become.
[0120]
Then, the coincidence detector 601 compares the one-symbol delayed detection signal 114 with the error pulse generation area display signal REF1b, and when they match, generates an error pulse 603 and outputs it to the OR circuit 602.
[0121]
The OR circuit 602 performs a logical OR operation on the error pulse 603 and the error pulse 214 output from the AND circuit 206, and outputs the error pulse 604 obtained as a result to the counter 109.
[0122]
That is, the error pulse 603 detected by the coincidence detector 601 must pass through a narrow error pulse generation region, but passes through the error pulse 115 of the one-symbol differential detection signal 114 according to the result of the determination by the determiner 205. The error pulse 603 corresponding to the one-symbol differential detection signal 114 is output to the counter 109 via the OR circuit 602 irrespective of the AND circuit 206, even if the determination error of the one-symbol differential detection signal 114 is large. The data can be output to the counter 109 via the OR circuit 602 and counted.
[0123]
For example, when the determiner 205 determines that the envelope information is correct, control is performed so that an error does not pass through the AND circuit 206. In this case, error counting is not performed.
[0124]
However, if the determination is erroneous and the one-symbol differential detection signal 114 contains an error, the correct count is not performed, and the count value 120 varies.
[0125]
Therefore, if the error of the one-symbol differential detection signal 114 is detected and counted in another path as described above, the error of the one-symbol differential detection signal 114 is counted even if the determination is incorrect as described above. Therefore, the variation of the count value 120 can be reduced.
[0126]
As described above, according to the sixth embodiment, in the one-symbol differential detection signal, two types of large and small error pulse generation areas are set, and when the one-symbol differential detection signal also exists in the smaller error pulse generation area, By generating an error pulse, it is possible to further reduce the variation in the number of error pulses between bursts as compared with the second embodiment, thereby performing a more accurate line quality estimation than the second embodiment. be able to.
[0127]
(Embodiment 7)
FIG. 7 shows a block diagram of a channel quality estimation device according to Embodiment 7 of the present invention. However, in the seventh embodiment shown in FIG. 7, parts corresponding to the respective parts of the sixth embodiment in FIG. 6 are denoted by the same reference numerals, and description thereof will be omitted.
[0128]
The feature of the seventh embodiment is that, in addition to the one-symbol differential detection signal, the two-symbol delayed detection signal sets two types of large and small error pulse generation areas, and the two-symbol differential detection signal is also set in the smaller error pulse generation area. Is present, an error pulse is generated so that more accurate channel quality estimation than in the sixth embodiment can be performed.
[0129]
The seventh embodiment shown in FIG. 7 is different from the sixth embodiment in that a coincidence detector 701 is provided in addition to the components of the sixth embodiment, and a three-input type is used instead of the two-input type OR circuit 602. In that the OR circuit 702 is provided.
[0130]
In such a configuration, the coincidence detector 701 is supplied with the two-symbol delayed detection signal 117 and the error pulse generation area display signal REF2b indicating that the error pulse generation area is narrower than the error pulse generation area display signal REF2. It has become.
[0131]
Then, the coincidence detector 701 compares the two-symbol delayed detection signal 117 with the error pulse generation area display signal REF2b, and when they match, generates an error pulse 703 and outputs it to the OR circuit 702.
[0132]
The OR circuit 702 performs a logical OR operation on the error pulse 703 and the error pulse 603 output from the coincidence detector 701, and the error pulse 214 output from the AND circuit 206, and counts the error pulse 704 obtained as a result. Output to 109.
[0133]
That is, the error pulse 703 detected by the coincidence detector 701 must pass through a narrow error pulse generation region, but passes through the error pulse 115 of the one-symbol differential detection signal 114 according to the result of the determination by the determiner 205. The error pulse 703 corresponding to the two-symbol differential detection signal 117 is output to the counter 109 via the OR circuit 702 irrespective of the AND circuit 206, even if the determination error of the two-symbol differential detection signal 117 is large. The data can be output to the counter 109 via the OR circuit 702 and counted.
[0134]
For example, when the determiner 205 determines that the envelope information is correct, control is performed so that an error does not pass through the AND circuit 206. In this case, error counting is not performed.
[0135]
However, if the determination is erroneous and the two-symbol differential detection signal 117 contains an error, the correct count is not performed, and the count value 120 will vary.
[0136]
Therefore, if the error of the two-symbol differential detection signal 117 is detected and counted in another path as described above, the error of the two-symbol differential detection signal 117 is counted even if the determination is erroneous as described above. Therefore, the variation of the count value 120 can be reduced.
[0137]
As described above, according to the seventh embodiment, in addition to the one-symbol differential detection signal, two types of error pulse generation areas are set in the two-symbol differential detection signal, and one symbol is also set in the smaller error pulse generation area. When the differential detection signal is present, by generating an error pulse, the variation in the number of error pulses between bursts can be further reduced than in the sixth embodiment. Furthermore, highly accurate channel quality estimation can be performed.
[0138]
(Embodiment 8)
FIG. 8 shows a block diagram of a channel quality estimation device according to Embodiment 8 of the present invention. However, in the eighth embodiment shown in FIG. 8, portions corresponding to the respective portions of the seventh embodiment in FIG. 7 are denoted by the same reference numerals, and description thereof will be omitted.
[0139]
The feature of the eighth embodiment is that, in addition to making the signal representing the error pulse generation region in the one- and two-symbol differential detection signals variable, two large and small thresholds for detecting errors in the envelope information are set. However, when an error in the envelope information is determined with a smaller threshold value, an error pulse is generated, so that more accurate channel quality estimation than in Embodiment 7 can be performed. On the point.
[0140]
The eighth embodiment shown in FIG. 8 is different from the seventh embodiment in that a subtractor 801 and a decision unit 802 are provided in addition to the components of the seventh embodiment, instead of the three-input type OR circuit 702. That is, it is configured to include a four-input type OR circuit 803.
[0141]
A subtractor 801 subtracts a threshold value 804 for detecting an error in envelope information from an absolute value 210 indicating a difference between the envelope information 207 output from the absolute value detector 203 and the reference value 208, The signal 805 indicating the result of the subtraction is output to the decision unit 802. However, the threshold value 804 is a value smaller than the threshold value 211.
[0142]
The determiner 802 determines from the signal 805 whether or not the absolute value 210 has exceeded the threshold value 804, and outputs a signal 806 indicating the determination result to the OR circuit 803.
[0143]
That is, if the absolute value 210 indicating the difference between the envelope information 207 and the reference value 208 exceeds the threshold 804, it is determined that the envelope information 207 of the Ich and Qch baseband signals 110 and 111 is incorrect. The determination result data 806 at the “H” level shown is output to the OR circuit 803, and if not, the determination result data 806 at the “L” level indicating that the envelope information 207 is correct is output to the OR circuit 803.
[0144]
Therefore, even if the absolute value 210 does not exceed the threshold value 211, if the absolute value 210 exceeds the threshold value 804, it is determined that the envelope information 207 is incorrect, and the OR circuit 803 outputs an error pulse 807 to the counter 109. Will be done.
[0145]
As described above, according to the eighth embodiment, in addition to making the signal representing the error pulse generation region in the one- and two-symbol differential detection signals variable, the threshold value for detecting an error in the envelope information is increased or decreased. If two types are set and an error in the envelope information is determined with the smaller threshold, an error pulse is generated to further reduce the variation in the number of error pulses between bursts as compared with the seventh embodiment. Thus, the channel quality can be estimated with higher accuracy than in the seventh embodiment.
[0146]
(Embodiment 9)
FIG. 9 shows a block diagram of a phase information generator used in the channel quality estimating apparatus according to Embodiment 9 of the present invention.
[0147]
The phase information generator shown in FIG. 9 is used in place of the memory circuit 101 shown in FIGS. 1 to 8, and includes an Ich absolute value detection circuit 901, a Qch absolute value detection circuit 902, and a subtractor 903. , A converter 904, and a quadrant determiner 905.
[0148]
First, for the phase θ = arctan (Q / I) and | I | − | Q | of the Ich and Qch baseband signals 110 and 111, an approximation expressed by the following equation (1) holds.
[0149]

FIG. 10 shows the relationship between | I | − | Q | and the phase θ = arctan (Q / I) of the Ich and Qch baseband signals 110 and 111. The phase θ can be generated with an error within 1.8 degrees by performing the approximation shown in the above equation (1).
[0150]
Absolute values of the Ich and Qch baseband signals 110 and 111 are detected by an Ich absolute value detection circuit 901 and a Qch absolute value detection circuit 902, respectively, and the detection signals 906 and 907 are subtracted by a subtractor 903. The obtained difference signal 908 is output to converter 904.
[0151]
The quadrants of the Ich and Qch baseband signals 110 and 111 are determined by the quadrant determiner 905, and the quadrant display signal 909 obtained by this determination is output to the converter 904. Then, the converter 904 converts the phase of the difference signal 908 according to the quadrant display signal 909, thereby obtaining the phase information 112.
[0152]
As described above, according to the ninth embodiment, a phase information generator that generates phase information 112 from Ich and Qch baseband signals 110 and 111 input to a channel quality estimating apparatus is replaced by a memory circuit 101 including a multiplier and a memory. , It is possible to reduce the circuit scale and reduce power consumption of the channel quality estimating apparatuses of the first to eighth embodiments.
[0153]
(Embodiment 10)
FIG. 11 shows a block diagram of a phase information generator used in the channel quality estimating apparatus according to Embodiment 10 of the present invention.
[0154]
The phase information generator shown in FIG. 11 is used in place of the memory circuit 201 shown in FIGS. 2 to 8, and includes a magnitude comparator 1101, a 2-bit shifter 1102, and a 3-bit shifter 1103. , Adders 1104 and 1105.
[0155]
First, in the phase and the envelope information Z of the Ich and Qch baseband signals 110 and 111, an approximation expressed by the following equation (2) holds.
[0156]
When | I |> | Q |
Z = | I | + 0.375 × | Q |
When | Q |> | I |
Z = | Q | + 0.375 × | I |
Here, 0.375 is a coefficient that enables the bit shift to be realized. That is, the multiplication of 0.375 can be realized by a bit shift.
[0157]
FIG. 12 shows a relationship between the phase θ of the Ich and Qch baseband signals 110 and 111 and the envelope information Z. Z can be generated with an error of 7% or less by performing the approximation shown in the above equation (2).
[0158]
The magnitudes of the Ich and Qch baseband signals 110 and 111 are compared by a magnitude comparator 1101 to indicate | I | when | I |> | Q |, and | Q |> | I | In this case, a magnitude comparison result signal 1106 indicating | Q | is obtained and output to the adder 1105, the 2-bit shifter 1102, and the 3-bit shifter 1103.
[0159]
The two-bit shifter 1102 and the three-bit shifter 1103 shift by two bits and three bits, respectively. The shifted signals 1107 and 1108 are added by an adder 1104. The sum signal 1109 and the magnitude comparison result signal 1106 are added. Are added by the adder 1105 to obtain the envelope information 207.
[0160]
As described above, according to the tenth embodiment, the envelope information generator that generates the envelope information 207 from the Ich and Qch baseband signals 110 and 111 input to the channel quality estimating device is provided by the multiplier and the memory including the memory. Since the configuration can be made without using the circuit 201, it is possible to reduce the circuit scale and reduce the power consumption of the channel quality estimating apparatuses according to the second to eighth embodiments.
[0161]
【The invention's effect】
As is apparent from the above description, according to the present invention, the ratio of correct signals present in the error pulse detection region of the Ich and Qch baseband signals is reduced, so that the maximum number of error pulses and the minimum Variation in the number of error pulse counts between bursts, which is the difference from the count number, can be reduced, and thereby highly accurate channel quality estimation can be performed.
[Brief description of the drawings]
FIG. 1 is a block diagram of a channel quality estimation device according to Embodiment 1 of the present invention.
FIG. 2 is a block diagram of a channel quality estimation apparatus according to Embodiment 2 of the present invention.
FIG. 3 is a block diagram of a channel quality estimation device according to Embodiment 3 of the present invention.
FIG. 4 is a block diagram of a channel quality estimation device according to Embodiment 4 of the present invention.
FIG. 5 is a block diagram of a channel quality estimation device according to Embodiment 5 of the present invention.
FIG. 6 is a block diagram of a channel quality estimation apparatus according to Embodiment 6 of the present invention.
FIG. 7 is a block diagram of a channel quality estimation device according to Embodiment 7 of the present invention.
FIG. 8 is a block diagram of a channel quality estimation device according to Embodiment 8 of the present invention.
FIG. 9 is a block diagram of a phase information generator used in a channel quality estimating apparatus according to Embodiment 9 of the present invention.
FIG. 10 is a diagram showing a theoretical calculation result of the phase information generator according to the ninth embodiment.
FIG. 11 is a block diagram of an envelope information generator used in a channel quality estimation apparatus according to Embodiment 10 of the present invention.
FIG. 12 is a diagram showing a theoretical calculation result of the envelope information generator according to the tenth embodiment.
FIG. 13 is a block diagram of a conventional line quality estimation device.
[Explanation of symbols]
101, 201 memory circuit
106, 107, 601, 701 Match detector
108,206 AND circuit
109 counter
203 Absolute value detector
205, 302, 802 Judge
303, 401, 501 selection switch
602, 702, 803 OR circuit
901 Ich absolute value detection circuit
902 Qch absolute value detection circuit
904 converter
905 Quadrant judging device
1101 Large and small comparator
1102 2-bit shifter
1103 3-bit shifter
1104, 1105 Adder

Claims (28)

First storage means for generating and storing phase information of the Ich and Qch baseband signals; and a one-symbol differential detection signal obtained by subtracting the phase information from the current phase information after delaying the phase information by one symbol period. A first coincidence detecting means for outputting a first error pulse when the signal coincides with the error pulse generation region; and a two-symbol differential detection signal obtained by subtracting the phase information from the current phase information after delaying the phase information by two symbol periods. A second coincidence detecting means for outputting a second error pulse when the first and second error pulses coincide with the second error pulse generation region, and performing an AND operation of the first and second error pulses; A logical AND unit that outputs a third error pulse indicating an error in the baseband signal; and a counting unit that counts the third error pulse. Line quality estimation apparatus to be. Second storage means for generating and storing envelope information of Ich and Qch baseband signals; absolute value detection means for detecting an absolute value of a difference between the envelope information and a reference value of the envelope; A first determining means for determining that the envelope information is incorrect when a first threshold value for detecting an error in the envelope information is exceeded, and outputting a level signal corresponding to the determination. includes, logical product means, channel quality according to claim 1, wherein the output of the third error pulse in accordance with a logical aND operation results including the level signal to the first and second error pulse to the counting means Estimation device. From a difference between a count value indicating the number of error pulses of the counting means and a second threshold value for suppressing the variation of the number of error pulses to an appropriate value, it is determined whether or not the count value exceeds the second threshold value. A second determination unit for determining, and a first control unit that varies a first error pulse generation region so that the count value becomes an appropriate value in accordance with a determination result of the second determination unit. The channel quality estimating device according to claim 1 or 2, wherein: The first control means performs control to narrow the first error pulse generation region when the result of the determination by the second determination means indicates that the count value has exceeded the second threshold value. Item 3. The line quality estimation device according to item 3 . 5. The control device according to claim 3, further comprising: a second control unit configured to vary a second error pulse generation region so that a count value becomes an appropriate value according to a determination result of the second determination unit. 6 . Line quality estimating apparatus as described in the above. The second control means performs control to narrow the second error pulse generation area when the result of the determination by the second determination means indicates that the count value has exceeded the second threshold value. Item 6. The line quality estimation device according to item 5 . A third control unit that varies a first threshold value used by the first determination unit to determine an error in the envelope information so that the count value becomes an appropriate value in accordance with a determination result of the second determination unit; The channel quality estimating apparatus according to any one of claims 3 to 6 , further comprising: The third control means, when the determination result of the second determination means indicates that the count value has exceeded the second threshold value, sets a value for detecting an error in the envelope information indicated by the first threshold value. 8. The channel quality estimating apparatus according to claim 7 , wherein the channel quality is increased. Third match detection means for outputting a fourth error pulse when the one-symbol differential detection signal matches a third error pulse generation region narrower than the first error pulse generation region; and a third error pulse and the fourth error pulse 3. The line quality estimating apparatus according to claim 2 , further comprising: a logical sum unit for performing a logical sum operation on the count value and outputting an error pulse obtained as a result to the count unit. And a fourth coincidence detecting means for outputting a fifth error pulse when the two-symbol differential detection signal coincides with a fourth error pulse generation area narrower than the second error pulse generation area. 10. The channel quality estimating apparatus according to claim 9 , wherein a logical sum operation of a fourth error pulse and the fifth error pulse is performed, and an error pulse obtained as a result is output to a counting unit. An absolute value of a difference between the envelope information detected by the absolute value detecting means and the reference value of the envelope is set to a third threshold smaller than a first threshold for detecting an error in the envelope information. When the envelope signal exceeds the threshold, the envelope information is determined to be erroneous, and a third determination means for outputting a level signal corresponding to the determination is provided. 11. The channel quality estimating apparatus according to claim 10 , wherein a logical sum operation is performed, and an error pulse obtained as a result is output to a counting means. Instead of the first storage means, Ich and Qch absolute value detecting means for detecting absolute values of Ich and Qch baseband signals, quadrant determining means for determining quadrants of the Ich and Qch baseband signals, depending on the quadrant claims 1 to, characterized in that it comprises the phase information generating means constituted by a conversion means for converting the detected Ich and Qch phase information the absolute value signal 12. The line quality estimating apparatus according to any one of 11 . Instead of the second storage means, a magnitude comparison means for comparing the absolute values of the Ich and Qch baseband signals and outputting a magnitude comparison result signal indicating the larger signal, and shifting the magnitude comparison result signal by M and N bits Shifting means, first adding means for adding the signals shifted by M and N bits, and second adding means for adding the result of addition of the first adding means and the magnitude comparison result signal to obtain envelope information. channel quality estimation apparatus according to any one of claims 2 to 12, characterized in that it comprises the envelope information generating unit configured to include and. A base station apparatus using the channel quality estimating apparatus according to any one of claims 1 to 13 . Mobile station apparatus characterized by using a channel quality estimation apparatus according to any one of claims 1 to 13. A mobile communication system using the channel quality estimation device according to any one of claims 1 to 13 for a base station device or a mobile station device. When the 1 and 2 symbol delayed detection signals obtained by subtracting the phase information of the Ich and Qch baseband signals from the current phase information after delaying the phase information by 1 and 2 symbol periods coincide with the first and second error pulse generation areas. And outputting an error pulse indicating an error in the Ich and Qch baseband signals in accordance with a result of a logical product operation of the two error pulses. The phase information of the Ich and Qch baseband signals is stored, and the stored phase information is delayed by one symbol period and then subtracted from the current phase information to obtain a one-symbol differential detection signal in the first error pulse generation area. When they match, a first error pulse is output, and the stored phase information is delayed by two symbol periods and then subtracted from the current phase information, and a two-symbol delayed detection signal obtained by the subtraction matches the second error pulse generation area. Outputting a second error pulse, and counting a third error pulse indicating an error of the Ich and Qch baseband signals obtained by performing a logical AND operation of the first and second error pulses. Line quality estimation method. Envelope information of the Ich and Qch baseband signals is stored, an absolute value of a difference between the stored envelope information and a reference value of the envelope is detected, and the detected absolute value is used as an error in the envelope information. Is determined to be erroneous when a first threshold value for detecting the error is exceeded, and a logical AND operation including the first determination result included in the first and second error pulses is performed. 19. The channel quality estimating method according to claim 18 , wherein the third error pulse is counted. From a difference between a count value indicating the number of error pulses of the counting means and a second threshold value for suppressing the variation of the number of error pulses to an appropriate value, it is determined whether or not the count value exceeds the second threshold value. 20. The channel quality estimating method according to claim 18 or 19 , wherein a determination is made, and a first error pulse generation area is varied according to the second determination result so that the count value becomes an appropriate value. . 21. The channel quality estimating method according to claim 20 , wherein when the second determination result indicates that the count value has exceeded the second threshold value, the first error pulse generation region is narrowed. 22. The channel quality estimating method according to claim 19 , wherein the second error pulse generation area is varied so that the count value becomes an appropriate value according to a second determination result. . 23. The channel quality estimating method according to claim 22 , wherein, when the second determination result indicates that the count value has exceeded the second threshold value, the second error pulse generation region is narrowed. In response to the second determination result, so that the count value becomes an appropriate value, according to claim 19 to claim, characterized in that for varying the first threshold value used to determine the error in the envelope information 23 The line quality estimation method according to any one of the above. When the second determination result indicates that the count value has exceeded the second threshold value, the value for detecting an error in the envelope information indicated by the first threshold value is increased. Item 25. The line quality estimation method according to Item 24 . A fourth error pulse is output when the one-symbol differential detection signal matches a third error pulse generation area narrower than the first error pulse generation area, and a logical sum operation of the third error pulse and the fourth error pulse is performed. 20. The method according to claim 19, wherein the error pulses obtained as a result are counted. When the two-symbol differential detection signal matches a fourth error pulse generation area narrower than the second error pulse generation area, a fifth error pulse is output, and the logic of the third and fourth error pulses and the fifth error pulse is output. 27. The channel quality estimating method according to claim 26 , wherein a sum operation is performed and error pulses obtained as a result are counted. An absolute value of a difference between the envelope information detected by the absolute value detecting means and the reference value of the envelope is set to a third threshold smaller than a first threshold for detecting an error in the envelope information. When it exceeds, it is determined that the envelope information is erroneous, a logical sum operation of the level signal corresponding to this determination and the third to fifth error pulses is performed, and the error pulses obtained as a result are counted. 28. The channel quality estimation method according to claim 27, wherein

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