Communication device and operating method thereof

Abstract

A communication device includes an analog-to-digital converter, a symbol accumulator, an enhanced first path search engine, a normal first path search engine, a selector, and a first path dynamic range generator. The analog-to-digital converter is configured to amplify symbols of a preset proportion in a set of input symbols to generate a set of amplified symbols. The symbol accumulator is configured to accumulate the set of amplified symbols to generate enhanced symbols, and accumulate unamplified symbols in the set of input symbols to generate normal symbols. The enhanced first path searcher is used for searching a first path according to the enhanced symbol. The normal first path searcher is used for searching a first path according to a normal symbol. If the enhanced first path searcher and / or the normal first path searcher searches a first path, the selector is configured to generate a first path signal. The first-path dynamic range generator is used for generating a first-path dynamic range at least according to the first-path signal.

Description

Technical Field

[0001] This invention relates to communication systems, and more particularly to a communication device and its operation method for improving the dynamic range of the first path in an ultra-wideband (UWB) system. Background Technology

[0002] Ultra-wideband (UWB) is a radio frequency technology that operates over a wide bandwidth, typically between 3.1 GHz and 10.6 GHz, enabling high data rates and precise ranging and positioning. UWB systems are characterized by transmitting extremely short pulses, usually in the nanosecond range or less, occupying a large bandwidth. UWB systems are widely used in wireless personal area networks (WPANs), positioning, radar, military, and security fields.

[0003] UWB systems estimate the first path dynamic range (FPDR) to achieve high-precision ranging and positioning applications. However, current UWB systems cannot improve the first path dynamic range, thus limiting ranging and positioning applications. Summary of the Invention

[0004] This invention provides a communication device comprising an analog-to-digital converter (ADC), a symbol accumulator, an enhanced first-path seeker, a normal first-path seeker, a selector, and a first-path dynamic range generator. The ADC amplifies a preset proportion of symbols from a set of input symbols to generate an amplified set of symbols. The symbol accumulator, coupled to the ADC, accumulates the amplified set of symbols to generate enhanced symbols, and accumulates unamplified symbols from the set of input symbols to generate normal symbols. The enhanced first-path seeker, coupled to the symbol accumulator, searches for the first path based on the enhanced symbols. The normal first-path seeker, coupled to the symbol accumulator, searches for the first path based on the normal symbols. The selector, coupled to the enhanced and / or normal first-path seekers, generates a first-path dynamic range based on the first-path signal if the enhanced and / or normal first-path seekers find the first path.

[0005] This invention also proposes a communication device comprising an analog-to-digital converter, a symbol accumulator, a first-path seeker, and a first-path dynamic range generator. The analog-to-digital converter amplifies a set of input symbols by a preset proportion to generate a set of amplified symbols, wherein the preset proportion is less than 1 / 2. The symbol accumulator is coupled to the analog-to-digital converter and accumulates the set of amplified symbols to generate accumulated symbols. The first-path seeker is coupled to the symbol accumulator and searches for the first path based on the accumulated symbols to generate a first-path signal. The first-path dynamic range generator is coupled to the first-path seeker and generates a first-path dynamic range at least based on the first-path signal.

[0006] This invention also proposes a method for operating a communication device, comprising amplifying a set of input symbols by a preset proportion to generate a set of amplified symbols, accumulating the set of amplified symbols to generate enhanced symbols, searching for the first diameter based on the enhanced symbols, accumulating unamplified symbols in the set of input symbols to generate normal symbols, searching for the first diameter based on the normal symbols, generating a first diameter signal if a first diameter is found based on the enhanced symbols and / or based on the normal symbols, and generating a first diameter dynamic range based at least on the first diameter signal. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of an ultra-wideband system according to an embodiment of the present invention. Figure 2 yes Figure 1 A waveform diagram of the received signal received by the communication device. Figure 3 yes Figure 1 Block diagram of the communication device. Figure 4 yes Figure 3 A flowchart illustrating the operation method of a communication device. Figure 5 yes Figure 3 A schematic diagram of an analog-to-digital converter producing a set of magnified symbols. Figure 6 This is a block diagram of another communication device in an embodiment of the present invention. Detailed Implementation

[0008] Figure 1 This is a schematic diagram of an ultra-wideband (UWB) system 1 according to an embodiment of the present invention. The UWB system 1 may include a communication device 10 and a communication device 12, which can communicate with each other using UWB technology. In the UWB system 1, the communication device 10 can send UWB signals (pulses) to the communication device 12 in a sporadic and sparse manner.

[0009] UWB pulses can be transmitted via a direct path Pd and a reflection path Pr. The direct path Pd represents the path through which the UWB pulse directly passes through obstacle 16 to reach the communication device 12, while the reflection path Pr represents the path through which the UWB pulse is reflected from the surface of obstacle 14 to reach the communication device 12. Therefore, the received signal received by the communication device 12 can include a primary diameter component transmitted via the direct path Pd and a secondary diameter component transmitted via the reflection path Pr, such as... Figure 2 As shown. Figure 2 This is a waveform diagram of the received signal received by communication device 12, where the horizontal axis represents time t and the vertical axis represents the voltage V of the received signal. Between times t1 and t2, the first diameter component 21 in the received signal occurs, corresponding to the direct path Pd. Between times t3 and t4, the main diameter component 22 in the received signal occurs, corresponding to the reflection path Pr. Since the length of the direct path Pd is shorter than the length of the reflection path Pr, the first diameter component 21 occurs earlier than the main diameter component 22. When the length difference between the direct path Pd and the reflection path Pr is large enough, the first diameter component 21 and the main diameter component 22 can be separated by a distance (t2, t3). In some embodiments, when the length difference between the direct path Pd and the reflection path Pr decreases, the distance between the first diameter component 21 and the main diameter component 22 also decreases, and sometimes the first diameter component 21 may even superimpose on the main diameter component 22. Furthermore, the UWB pulse attenuates significantly when passing through obstacle 16, but only slightly when reflected from the surface of obstacle 14. Therefore, the peak value V1 of the primary diameter component 21 may be lower than the peak value V2 of the major diameter component 22.

[0010] Since the first path component 21 corresponds to the direct path Pd, the communication device 12 can detect the first path component 21 from the received signal to estimate the time-of-flight (ToF), time-of-arrival (ToA), distance between the communication devices 10 and 12, and other location information. The received signal is an analog signal. In the analog-to-digital conversion process, the communication device 12 can convert the peak value V2 of the first path component 22 to the maximum quantization level of the analog-to-digital converter (ADC). Therefore, the equivalent quantization bit width of the first path component 22 is equal to the resolution of the ADC. For example, if the ADC resolution is 7 bits, the equivalent quantization bit width of the first path component 22 can also be 7 bits. If the peak value V1 of the first path component 21 is very weak compared to the peak value V2 of the main path component 22, the equivalent quantization bit width of the first path component 21 may be smaller than the minimum quantization level of the ADC, causing the communication device 12 to be unable to identify the first path component 21. The ability of the communication device 12 to detect weak first path components 21 is called the first path dynamic range (FPDR), expressed in decibels (dB). A larger first path dynamic range indicates that the communication device 12 can detect smaller first path components 21, and the stronger its ability to detect weak first path components 21. The communication device 12 can perform channel impulse response (CIR) estimation to generate information about the first path dynamic range.

[0011] Although Figure 1 Only two transmission paths are displayed. UWB pulses can also be transmitted via more paths. In this case, the received signal will contain a primary path component and multiple reflection path components. The one with the largest peak value among the multiple reflection path components is called the primary path component.

[0012] Figure 2 The received signal y(t) is a time-domain signal, expressed by formula (1):

[0013] y(t)=Kx(t)+x(t-τ)+n Formula (1)

[0014] Where Kx(t) is the first diameter component;

[0015] x(t-τ) is the principal diameter component;

[0016] n represents noise;

[0017] t represents time;

[0018] τ is the time delay of the principal diameter component relative to the first diameter component; and

[0019] K represents the strength of the initial diameter component.

[0020] The communication device 12 can adjust the automatic gain control (AGC) setting according to the main diameter component x(t-τ) so that the equivalent quantization bit width of the main diameter component x(t-τ) is equal to the resolution M of the ADC. Since the AGC setting is fixed and the intensity of the first diameter component Kx(t) is K times that of the main diameter component x(t-τ), the equivalent quantization bit width of the first diameter component Kx(t) can be equal to (M+log2K). The equivalent quantization bit width (M+log2K) of the first diameter component Kx(t) must be greater than the minimum effective detection bit p for the communication device 12 to identify the first diameter component Kx(t), as shown in formula (2):

[0021] M + log₂K ≥ p Formula (2)

[0022] The minimum effective detection bit p is a constant between 0 and 1, depending on the CIR estimation scheme and the noise floor of the ADC. Generally speaking, the lower the noise floor of the ADC, the closer the minimum effective detection bit p is to 0. Formula (2) is rearranged into the mathematical expression -log2K≤Mp, and both sides of this expression are processed and 20log2K is taken. 10 The power difference between the principal diameter component x(t-τ) and the first diameter component Kx(t) can be obtained, or the first diameter dynamic range FPDR, as shown in formula (3):

[0023] FPDR = -20log 10 (K)≤20log 10 (2 M-p = 6.02 (Mp) Formula (3)

[0024] According to formula (3), the first-path dynamic range (FPDR) can be determined by the equivalent quantization bit width M and the minimum effective detection bit p of the main-path component x(t-τ). Since the equivalent quantization bit width M is equal to the resolution of the ADC, and the minimum effective detection bit p is usually a constant of about 1, it is difficult to reduce the minimum effective detection bit p, making it very difficult to improve the first-path dynamic range (FPDR) by adjusting the minimum effective detection bit p. For example, if M = 7 and p = 1, the first-path dynamic range (FPDR) of the communication device 12 will be essentially fixed at 36 dB (= 6.02(7-1)).

[0025] If the ADC further amplifies the received signal y(t) through the AGC circuit to increase the equivalent quantization bit width of the first diameter component Kx(t) and the main diameter component x(t-τ) by N bits respectively, then the amplified equivalent quantization bit width of the first diameter component Kx(t) can be (M+N+log2K), and the amplified equivalent quantization bit width of the main diameter component x(t-τ) can be (M+N). Since the amplified equivalent quantization bit width (M+N) of the main diameter component x(t-τ) exceeds the resolution M of the ADC, clipping will occur, introducing clipping noise f(N), causing the minimum effective detection bit p to be updated to (p+f(N)). The amplified equivalent quantization bit width (M+N+log2K) of the first diameter component Kx(t) must be greater than the updated minimum effective detection bit (p+f(N)) for the communication device 12 to identify the first diameter component Kx(t), as shown in formula (4):

[0026] M+N+log2K≥p+f(N) Formula (4)

[0027] Rearrange formula (4) into the mathematical expression -log2K≤M+Npf(N), and process both sides of this mathematical expression and take 20log 10 The initial diameter dynamic range (FPDR) can then be obtained, as shown in formula (5):

[0028] FPDR = -20log 10 (K)≤20log 10 (2 M+N-p-f(N) =6.02(M+Npf(N)) Formula (5)

[0029] According to formula (5), the first-path dynamic range (FPDR) can be determined by the ADC's resolution M, equivalent upscaling bits N, minimum effective detection bits p, and chopped noise f(N). Since the ADC's resolution M and minimum effective detection bits p remain unchanged, and the equivalent upscaling bits N are greater than the chopped noise f(N), the first-path dynamic range (FPDR) is improved. For example, if M = 7, N = 1, p = 1, and f(N) = 0.35, then the first-path dynamic range (FPDR) of the communication device 12 is essentially 40 dB (=6.02(7+1-1-0.35)). Compared with the first-path dynamic range (FPDR) of the unamplified received signal y(t), the first-path dynamic range (FPDR) of the amplified received signal y(t) is improved by 4 dB (=40-36). In another example, if M = 7, N = 2, p = 1, and f(N) = 1, then the first-path dynamic range (FPDR) of communication device 12 is substantially 42 dB (= 6.02(7 + 2 - 1 - 1)). Compared to the first-path dynamic range (FPDR) of the unamplified received signal y(t), the first-path dynamic range (FPDR) of the amplified received signal y(t) is improved by 6 dB (= 42 - 36).

[0030] Figure 3 This is a block diagram of the communication device 12. The communication device 12 includes an antenna 30, a front-end circuit 31, an ADC 32, an AGC circuit 37, a symbol accumulator 33, a normal first-path seeker 341, an enhanced first-path seeker 342, a selector 35, and an FPDR generator 36. The antenna 30, front-end circuit 31, ADC 32, and symbol accumulator 33 may be coupled sequentially. The AGC circuit 37 may be coupled to the ADC 32, and the front-end circuit 31 may be coupled to the AGC circuit 37. The normal first-path seeker 341 and the enhanced first-path seeker 342 may be coupled to the symbol accumulator 33. The selector 35 may be coupled to the normal first-path seeker 341 and the enhanced first-path seeker 342. The FPDR generator 36 may be coupled to the selector 35.

[0031] Antenna 30 can receive UWB pulses to generate a signal Sr. Front-end circuitry 31 can amplify, filter, and perform other signal processing on signal Sr to generate a received signal y. The received signal y may contain frames, which may sequentially include a synchronization sequence, a start frame delimiter (SFD), a scrambled timestamp sequence (STS), and payload data, wherein the synchronization sequence and the start frame delimiter can form a preamble. ADC 32 can convert the received signal y from analog to digital to generate multiple bits in the frame. Each bit may contain a set of input symbols, and each set of input symbols contains Q input symbols, where Q is an integer greater than 1, for example, Q = 8. Each input symbol may contain a first diameter component and a second diameter component. The AGC circuit 37 can adjust the AGC setting according to the main diameter component 22, and adjust the gain of the front-end circuit 31 (e.g., amplifier gain) according to the AGC setting so that the equivalent quantization bit width of the main diameter component 22 can be the resolution M of the ADC (e.g., M=7).

[0032] Furthermore, the AGC circuit 37 can adjust the AGC settings to cause the front-end circuit 31 to amplify the preamble and / or STS code, thereby causing the ADC 32 to amplify a preset proportion of symbols in a set of input symbols to generate a set of amplified symbols. The amplified equivalent quantization bit width of the first diameter component in each amplified symbol in the set of amplified symbols can be (M+N+log2K), and the equivalent quantization bit width of the main diameter component can be (M+N). The set of amplified symbols can have a repeating symbol structure, such as a preamble in a UWB system. In some embodiments, the set of amplified symbols may not include the scrambled timestamp sequence (STS) of a UWB system. The preset proportion can be less than 1 / 2 so that each set of input symbols can still retain the complete information of at least half of the main diameter components for subsequent data processing. For example, the preset ratio can be 0.25, M=7, N=1, and the ADC 32 can amplify 2 of the 8 input symbols in the preamble or STS code to generate a set of amplified symbols, without amplifying the remaining 6 input symbols. The equivalent quantization bit width of the first diameter component in each amplified symbol can be (8+log2K), and the equivalent quantization bit width of the first diameter component in each unamplified symbol can be (7+log2K).

[0033] Symbol accumulator 33 can accumulate the set of amplified symbols to generate an enhanced symbol Se, and accumulate the unamplified symbols in the set of input symbols to generate a normal symbol Sn. Normal first-path searcher 341 can search for the first path based on the normal symbol Sn. Enhanced first-path searcher 342 can search for the first path based on the enhanced symbol Se. Normal first-path searcher 341 and enhanced first-path searcher 342 can be correlators. In some embodiments, normal first-path searcher 341 can correlate the normal symbol Sn with a predetermined symbol to detect multiple pulses corresponding to a multipath, thereby generating a search result Rn. The predetermined symbol can be the sum of a known sequence in a preamble or STS code. The first path can correspond to the earliest pulse among multiple pulses in a multipath. If the correlation between the normal symbol Sn and the predetermined symbol is successful, normal first-path searcher 341 can indicate in the search result Rn that the first path and / or other paths have been found. If the correlation between the normal symbol Sn and the predetermined symbol fails, normal first-path searcher 341 can indicate in the search result Rn that no path has been found. Similarly, the enhanced first path seeker 342 can correlate the enhanced symbol Se and the predetermined symbol to detect multiple pulses corresponding to the multipath, thereby generating a search result Re.

[0034] If the normal first diameter finder 341 and / or the enhanced first diameter finder 342 finds the first diameter, the selector 35 can generate a first diameter signal Sp. The selector 35 can determine whether the normal first diameter finder 341 and the enhanced first diameter finder 342 found the first diameter based on the search result Re and the search result Rn, respectively. Specifically, if the search result Re indicates that the enhanced first diameter finder 342 found the first diameter and the search result Rn indicates that the normal first diameter finder 341 did not find the first diameter, the selector 35 can generate a first diameter signal Sp based on the enhancement symbol Se. In some embodiments, the selector 35 can directly output the enhancement symbol Se as the first diameter signal Sp. If the search result Re indicates that the enhanced first diameter finder 342 found the first diameter and the search result Rn indicates that the normal first diameter finder 341 found the first diameter, the selector 35 can generate a first diameter signal Sp based on the enhancement symbol Se. In some embodiments, the selector 35 can directly output the enhancement symbol Se as the first diameter signal Sp. If the search result Re indicates that the enhanced first-path seeker 342 did not find the first path and the search result Rn indicates that the normal first-path seeker 341 found the first path, then the selector 35 can generate the first-path signal Sp based on the normal symbol Sn. In some embodiments, the selector 35 can directly output the normal symbol Sn as the first-path signal Sp. If the search result Re indicates that the enhanced first-path seeker 342 did not find the first path and the search result Rn indicates that the normal first-path seeker 341 did not find the first path, then the selector 35 may not generate the first-path signal Sp. In some embodiments, the selector 35 may include a multiplexer and selection logic, which can select whether the multiplexer should output the normal symbol Sn or the enhanced symbol Se as the first-path signal Sp based on the search result Re and the search result Rn.

[0035] The FPDR generator 36 can generate the first-path dynamic range FPDR based at least on the first-path signal Sp. In some embodiments, the FPDR generator 36 can generate the first-path dynamic range FPDR based on the actual equivalent quantization bit width Sbw of the first-path signal Sp, the resolution M of the ADC 32, the rise bit N of the set of amplified symbols, and the cutoff noise f(N), as expressed by formula (6):

[0036] FPDR=6.02(M+N-Sbw-f(N)) Formula (6)

[0037] Formula (6) is similar to formula (5), but formula (6) uses the actual equivalent quantization bit width Sbw of the first path signal Sp to replace the minimum effective detection bit p in formula (5). The actual equivalent quantization bit width Sbw of the first path signal Sp is greater than or equal to the minimum effective detection bit p. For example, if M = 7, N = 2, Sp = 2, and f(N) = 1, then the first path dynamic range FPDR of the communication device 12 is actually 36dB (= 6.02(7+2-2-1)).

[0038] Figure 4 This is a flowchart of method 4 for operating the communication device 12. Method 4 includes steps S402 to S410 for improving the first-path dynamic range (FPDR). Any reasonable technical changes or adjustments to the steps are within the scope of this invention. The details of steps S402 to S410 are as follows:

[0039] Step S402: ADC 32 amplifies the symbols in the set of input symbols by a preset ratio to generate a set of amplified symbols;

[0040] Step S404: The symbol accumulator 33 accumulates the set of amplified symbols to generate an enhanced symbol Se, and the enhanced first path searcher 342 searches for the first path based on the enhanced symbol Se;

[0041] Step S406: The symbol accumulator 33 accumulates the unamplified symbols in the set of input symbols to generate a normal symbol Sn, and the normal first path searcher 341 searches for the first path based on the normal symbol Sn;

[0042] Step S408: Selector 35 determines whether the first path can be found based on the enhancement symbol Se and / or the enhancement symbol Se. If yes, continue to step S410; if no, end method 4.

[0043] Step S410: FPDR generator 36 generates the first diameter dynamic range FPDR based at least on the first diameter signal Sp; End method 4.

[0044] The following combinations Figure 5 Explain the operation method 4. Figure 5 This is a schematic diagram of an ADC 32 generating a set of amplified symbols, where the horizontal axis represents time t and the vertical axis represents gain G. Figure 5 A set of input symbols is displayed, including symbols sym0 to sym7. Symbols sym0 to sym7 can be preamble symbols or STS symbols. First, the preset ratio can be 25%. The AGC circuit 37 adjusts the AGC setting so that the front-end circuit 31 amplifies part of the signal Sr (including the preamble code and / or STS code), thereby causing the ADC 32 to amplify symbols sym2 and sym3 according to the amplification gain, and not amplify symbols sym0, sym1, sym4 to sym7, where the gain value of symbols sym2 and sym3 is G2, and the gain value of symbols sym0, sym1, sym4 to sym7 is G1, G2>G1 (step S402).

[0045] In some embodiments, the set of amplified symbols may be consecutive symbols in the set of input symbols, such as symbols sym2 and sym3, to stabilize the AGC circuit 37 and the front-end circuit 31. In other embodiments, the set of amplified symbols may be discontinuous symbols in the set of input symbols, such as symbols sym0 and sym3.

[0046] In step S404, the symbol accumulator 33 accumulates amplified symbols sym2 and sym3 to generate an enhanced symbol Se, and the enhanced first-path searcher 342 searches for the first path based on the enhanced symbol Se to generate a search result Re. In step S406, the symbol accumulator 33 accumulates the original symbols sym0, sym1, sym4 to sym7 to generate a normal symbol Sn, and the normal first-path searcher 341 searches for the first path based on the normal symbol Sn to generate a search result Rn. Steps S404 and S406 can be executed in parallel or sequentially. In step S408, the selector 35 determines, based on the search result Re and the normal symbol Sn, whether a first path can be found based on the enhanced symbol Se and / or the enhanced symbol Se. If so, the selector 35 generates a first-path signal Sp, and the FPDR generator 36 generates at least the first-path dynamic range FPDR based on the first-path signal Sp (step S410), and method 4 ends. If no first path is found, method 4 ends. The methods by which selector 35 generates the first diameter signal Sp and FPDR generator 36 generates the first diameter dynamic range FPDR have been explained above and will not be repeated here.

[0047] In some embodiments, the first path component is superimposed on the main path component. If the amplification gain of the amplification symbol is too high, the first path component will fall into the chopping region and be discarded. To avoid discarding the first path component, the spreading factor L of the UWB signal can be increased. The unit of the spreading factor L can be equal to the pulse width Tp of the UWB pulse, for example, 2 nanoseconds (ns). For example, increasing the spreading factor L to 128 units increases the spacing between adjacent UWB pulses to 256 ns, thereby reducing the probability of discarding the first path component due to overlap between the first and main path components.

[0048] Figure 6 This is a block diagram of another communication device 62 in an embodiment of the present invention. Figure 6 The communication device 62 can be used as a replacement Figure 3 The communication device 12 generates the first-path dynamic range (FPDR). Compared to Figure 3 , Figure 6 The communication device 62 lacks the normal first-path seeker 341 and selector 35; the operation and connection of the other components in the communication device 62 are similar to those in the standard device. Figure 3The explanation of the communication device 12 is omitted here. The communication device 62 generates the first-path signal Sp solely based on the first-path search result of the enhanced first-path searcher 342, thus eliminating the need for the normal first-path searcher 341 and selector 35, reducing circuit area and manufacturing costs. It uses the enhanced symbol Se to detect the first-path to improve the first-path dynamic range (FPDR). The communication device 62 employs a more aggressive AGC adjustment strategy. For line-of-sight (LOS) scenarios (i.e., no first-path scenarios) in UWB systems, the approach of the communication device 62 can lead to clipping, affecting the estimation accuracy of the main path. In some embodiments, for non-line-of-sight (NLOS) scenarios (i.e., scenarios where the first path exists) in UWB systems, the communication device 62 can be used if the weakest path does exist and needs to be detected.

[0049] Figures 1 to 6 The embodiments disclose a communication device and its operation method, which detect the first diameter signal based on a set of amplified symbols, thereby improving the first diameter dynamic range (FPDR). The above description is only a preferred embodiment of the present invention. Any equivalent changes and modifications made to the scope of the present invention should be included in the scope of the present invention. Symbol Explanation

[0050] 1: Ultra-wideband system 10,12,62: Communication device 14,16: Obstacles 21: Initial diameter composition 22: Main diameter component 30: Antenna 31: Front-end circuit 32: Analog-to-digital converter 37: Automatic Gain Control Circuit 33: Symbolic accumulator 341: Normal First Path Finder 342: Enhanced First Path Finder 35: Selector 36: Initial Diameter Dynamic Range Generator 4: Method S402 to S410: Steps G1, G2: Gain values FPDR: First-diameter dynamic range Pd: direct path Pr: Reflection Path Rn, Re: Search results Se: Enhanced symbol Sn: Normal symbol Sr: signal Sp: Head diameter signal sym0 to sym7: symbols t, t1 to t4: Time V: Voltage V1, V2: Peak values y: Received signal

Claims

1. A communication device, comprising: An analog-to-digital converter is used to amplify a set of input symbols by a preset ratio to produce a set of amplified symbols; A symbol accumulator, coupled to the analog-to-digital converter, is used to accumulate the set of amplified symbols to generate enhanced symbols, and to accumulate the set of unamplified symbols in the input symbols to generate normal symbols; An enhanced first-path seeker, coupled to the symbol accumulator, is used to search for the first path based on the enhanced symbol; A normal first-path finder, coupled to the symbol accumulator, is used to search for the first path based on the normal symbols; A selector, coupled to the enhanced head diameter seeker and the normal head diameter seeker, is used to generate a head diameter signal if the enhanced head diameter seeker and / or the normal head diameter seeker finds the head diameter. as well as A first diameter dynamic range generator, coupled to the selector, is used to generate a first diameter dynamic range based at least on the first diameter signal.

2. The communication device as claimed in claim 1, wherein: If the enhanced first diameter finder finds the first diameter and the normal first diameter finder does not find the first diameter, then the selector generates the first diameter signal based on the enhanced symbol.

3. The communication device as claimed in claim 1, wherein: If the enhanced first diameter finder finds the first diameter and the normal first diameter finder finds the first diameter, then the selector generates the first diameter signal based on the enhanced symbol.

4. The communication device as claimed in claim 1, wherein: If the enhanced first diameter finder fails to find the first diameter while the normal first diameter finder finds the first diameter, the selector generates the first diameter signal based on the normal symbol.

5. The communication device as claimed in claim 1, wherein, The preset ratio is less than 1 / 2.

6. The communication device as claimed in claim 1, wherein, The first diameter dynamic range generator generates the first diameter dynamic range based on the first diameter signal, the resolution of the analog-to-digital converter, the amplification gain of the set of amplification symbols, and the cutoff noise.

7. The communication device as claimed in claim 1, wherein, The amplifier amplifies a preset proportion of consecutive symbols in the set of input symbols to produce the amplified set of symbols.

8. The communication device as claimed in claim 1, wherein, The analog-to-digital converter is also used to convert the received signal from analog to digital to generate the set of amplified symbols.

9. A communication device, comprising: An analog-to-digital converter is used to amplify a set of input symbols by a preset ratio to produce a set of amplified symbols; A symbol accumulator, coupled to the analog-to-digital converter, is used to accumulate the set of amplified symbols to generate an accumulated symbol; A first-path seeker, coupled to the symbol accumulator, is used to search for the first path based on the accumulated symbols to generate a first-path signal; as well as A first diameter dynamic range generator, coupled to the first diameter seeker, is used to generate a first diameter dynamic range at least based on the first diameter signal; The preset ratio is less than 1 / 2.

10. A method of operating a communication device, comprising: Enlarge a set of input symbols by a preset ratio to produce a set of enlarged symbols; The set of amplification symbols is accumulated to generate enhancement symbols, and the first path is searched based on the enhancement symbols; Accumulate the unamplified symbols in the set of input symbols to generate normal symbols, and search for the first path based on the normal symbols; If the first diameter is found based on the enhanced symbol and / or the first diameter is found based on the normal symbol, a first diameter signal is generated; as well as The dynamic range of the first diameter is generated based at least on the first diameter signal.

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