CN1194476C - System and method for improving high data rate wireless terminal characteristic using diversity - Google Patents
System and method for improving high data rate wireless terminal characteristic using diversity Download PDFInfo
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- CN1194476C CN1194476C CNB011453079A CN01145307A CN1194476C CN 1194476 C CN1194476 C CN 1194476C CN B011453079 A CNB011453079 A CN B011453079A CN 01145307 A CN01145307 A CN 01145307A CN 1194476 C CN1194476 C CN 1194476C
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Abstract
Disclosed is a system and method for improving HDR (high data rate) wireless terminal characteristic using diversity. The wireless terminal includea: two transmission paths, in which one containes diplexers, another bypass duplexer; and two receiving paths, in which one containing diplexers, and the other does not contain diplexers and completely isolates with ang transmission path. When the terminal was identified as a HDR mode, the transmission path and the two receiving paths including duplexers are all used. When the terminal work in low-data-rate mode, the transmission path with the bypass duplexer and the receiving path completely isolating with ang transmission path are used, resulting in a lower minimum detectable signal, thus reducing the current consumption in the wireless terminals.
Description
Technical field
A kind of diversity antenna technology in wireless terminal of relate generally to of the present invention, and more specifically relates to the transmission that improves high data rate wireless terminal and the technology of reception.
Technical background
In the wireless terminal of routine, the shared antenna of transmitter and receiver.When the reception antenna diversity technique is applied on the wireless terminal, provide the combination of a plurality of antenna selectivities ground high-quality signal, therefore improved receiving efficiency and increased processing data rate.Fig. 1 is the schematic diagram that expression is used for carrying out at conventional wireless terminal the system of antenna diversity.With reference to Fig. 1, the receiver Rx that is connected to switch SW 1 detects the intensity of the signal of a specific antenna reception passing through ANT1 or ANT2.If the signal strength signal intensity by specific antenna detection is higher than a predetermined threshold value, then this receiver Rx just utilizes this specific antenna.If the signal strength signal intensity that is detected is lower than this predetermined threshold value, this receiver utilizes other antenna by conversion SW1 to other antenna.After receiver was selected antenna, transmitter Tx utilized remaining antenna.
In addition, conventional wireless terminal is isolated transmission signal and received signal by duplexer, and carries out the voice-and-data business by transmitter circuit and receiver circuit.Fig. 2 represents that conventional wireless terminal sends the schematic diagram of signal and received signal by the duplexer isolation.With reference to Fig. 2, the duplexer 200 that is inserted between antenna and the transmitter Tx is isolated transmission signal and received signal, so that carry out full-duplex operation.That is to say that during sending, the power output of the PAM (power amplifier module) in the transmitter Tx (not shown) sends to antenna ANT by duplexer with maximum power.At reception period, receive the low power RF signal and be sent to low noise amplifier (not shown) in receiver Rx by antenna ANT, so that receive with maximum power by duplexer.But, when sending with received signal, exist high insertion loss with maximum power.Have again,, exist the interference that sends between signal and the received signal owing to pass through the incomplete isolation of each signal of duplexer.The appearance of this interference is because the transmitted power much higher and therefore interference receiver than received power usually.
The shortcoming of conventional wireless terminal is, when transceiver utilizes a single antenna and duplexer as common path, incomplete isolation between the loss of duplexer device itself and transmitter and the receiver, increased the level of minimum detectable signal (MDS), the result causes the increase of wireless terminal on current drain.
Therefore, exist in the needs that the wireless terminal of duplexer is isolated and avoided using to transmit path and RX path during the low data rate tupe fully, therefore feasiblely might reduce the level of minimum detectable signal and the current drain of wireless terminal.
Summary of the invention
Therefore, an object of the present invention is to improve wireless terminal transmission and receptivity during low-rate data is handled in HDR (high data rate) transmission system.
Another object of the present invention provide a kind of during low data rate tupe transmit path and RX path isolate and avoid using the wireless terminal of duplexer, the therefore feasible level and the wireless telephonic current drain that might reduce minimum detectable signal fully.
Another object of the present invention provides a kind of wireless terminal that utilizes first RX path, second RX path and transmit path during the high data rate tupe.
In order to realize above-mentioned purpose with other, a kind of wireless terminal is provided, this wireless terminal comprises: be used for first transceiver of the transmission and the reception of the general signal such as voice transfer, this transceiver comprises: the transmit button that second transmit path of first antenna, first RX path by duplexer, first transmit path by duplexer, bypass duplexer and being used for is changed between first and second transmit paths.This wireless terminal also comprises second receiver that is used to receive high data rate, and this receiver comprises: second antenna and second RX path.Because this second receiver is not carried out transmission, it is free of attachment to duplexer.
A kind of method that is used to utilize said system to realize above-mentioned purpose with other also is provided.If determine to take place the HDR transmission, then transmit button is set in order to first transmit path that is used in first transceiver.Then, the signal that enters is received by public first and second RX path of utilizing.If do not detect the HDR transmission, then transmit button is set to use second transmit path of the bypass duplexer in first transceiver.Then, the signal that enters only utilizes second path in second receiver to receive.By during low data rate tupe, isolating transmit path and RX path fully and avoid using duplexer, can reduce the level of minimum detectable signal, and can reduce wireless telephonic current drain.
Description of drawings
From the detailed description below in conjunction with accompanying drawing, above-mentioned and other each purpose of the present invention, characteristics and advantage will become clearer, wherein:
Fig. 1 is illustrated in the schematic diagram of carrying out the system of antenna diversity in the conventional wireless terminal;
Fig. 2 is the conventional wireless terminal that sends signal and received signal is isolated in expression by duplexer a schematic diagram;
Fig. 3 is the schematic diagram according to the HDR wireless terminal of a preferred embodiment of the present invention; With
Fig. 4 is the flow chart of method of operation of the preferred embodiment of presentation graphs 3.
Embodiment
With reference to each accompanying drawing the preferred embodiments of the present invention are described below.In the following description, will not describe in detail known function or structure, because do like this, those inessential details might have been obscured the present invention.
Referring now to each accompanying drawing, label identical in wherein several accompanying drawings is all represented similar or identical parts.Fig. 3 is the schematic diagram according to the HDR wireless terminal of a preferred embodiment of the present invention.With reference to Fig. 3, involved in the present invention have a plurality of antennas () wireless terminal in this example, two antennas, first transceiver (transceiver #1) and second receiver (receiver #2) be connected respectively to the first antenna ANT1 and the second antenna ANT2.The signal that transceiver # 1 carries out in wireless terminal sends and receives, and receiver # 2 is used to receive the highest 2.4Mbps two-forty (or high-speed) data that limited by the IS-856 standard, only carries out signal and receives.Receiver # 2 ad hoc carries out a kind of known 1xEV-DO (only evolution-data evolution-data) operation.For transmission and the reception of carrying out signal, transceiver # 1 comprises the first transmit path Tx# 1, the second transmit path Tx# 2 and RX path Rx#1.Because receiver # 2 only carries out signal and receives, it only comprises RX path Rx# 2.
At first, will the structure of the transceiver # 1 of preferred embodiment be described.As mentioned above, transceiver # 1 comprises: the first transmit path Tx# 1, the second transmit path Tx# 2 and RX path Rx#1.Except duplexer 305, the structure of transmit path Tx# 1 and Tx# 2 comes down to identical.Tx# 1 and Tx# 2 comprise multiplier 324, RF BPF (radio frequency band filter) 323, driver 322, BPF (band pass filter) 321 and the power amplifier 320 that is connected in series to transmit button 315.Transmit button 315 by microprocessor 310 controls determines that according to the position of transmit button 315 Tx# 1 still is that Tx# 2 is used.In order to control the position of transmit button 315, microprocessor determines that this wireless terminal is to be in low data rate tupe, still is in the high data rate tupe.If this wireless terminal is in low data rate tupe, this transmit button 315 is switched to position 1.If microprocessor is determined this wireless terminal and is in the high data rate tupe that this transmit button 315 is switched to position 2.When transmit button is in position 1, use Tx# 1 and send signal to send to antenna ANT1 by duplexer 305.Under another situation, when transmit button 315 is in position 2, uses Tx# 2 and transmission signal bypass duplexer 305 and directly send to antenna ANT1.The RX path # 1 of transceiver 1 comprises antenna ANT1, duplexer 305, LNA (low noise amplifier) 316A, BPF 317A, multiplier 318A and the RF BPF 319A that is connected in series.
In general, the antenna that is used for wireless terminal comprises helical antenna and the whip antenna that protrudes in the wireless terminal outside.In a preferred embodiment of the invention, though do not limit, also use the antenna of these types.Helical antenna work when whip antenna is withdrawn into the inside of wireless terminal is when whip antenna whip antenna work when wireless terminal stretches out.
Be drawn in following table 1 expression antenna ANT1 and the characteristic of ANT2.
Table 1
| | Type | |
| ANT | ||
| 1 | Rx/Tx, the broadband | Helical antenna cooperates |
| ANT | ||
| 2 | Rx, the arrowband | Helical antenna (, may use whip antenna) according to antenna length |
The method of operation of the preferred embodiment is described now with reference to Fig. 3 and 4.With reference to Fig. 4, the flow chart of the method for operation of the preferred embodiment of key diagram 3 in step 401, begins a speech data business.In step 402, microprocessor 310 determines that this wireless terminal is to be operated in the high data rate tupe, still is operated in low data rate tupe.If determine that at step 402 microprocessor 310 this wireless terminal should be operated in the high data rate tupe, then in step 403, microprocessor 310 conversion transmit buttons 315 are to position 1.Along with transmit button 315 in the position 1, the transmit path Tx# 1 that comprises duplexer 305 will be used in high data rate and send.Duplexer 305 is used to isolate along the transmission signal of Tx# 1 and received signal along Rx#1.In step 404, RX path Rx# 1 is powered, and is used to received signal in step 405 with the RX path Rx# 2 of receiver #2.Which path of depending on two RX path is receiving stronger signal, alternately uses Rx# 1 and Rx# 2.
In step 402, if microprocessor 310 determines that this wireless terminal will not be operated in the high data rate tupe, but be operated in low data rate tupe, then in step 406, transmit button 315 is transformed into position 2 by microprocessor 310.Along with transmit button is in position 2, use the transmit path Tx# 2 of bypass duplexer 305.In step 407, RX path Rx# 1 is de-energized and carries out separately at the task of the step 408 received signal RX path Rx# 2 by the receiver # 2 that isolates fully with transmit path Tx#2.Cause lower minimum detectable signal like this, it makes wireless terminal can receive the signal of lower-wattage, has therefore reduced the consumption of power.
Be provided at the work that following table 2 further specifies wireless terminal.
Table 2
| Pattern | The transceiver that is using | Operation | ||
| The transmit button position | Duplexer | |||
| Low data rate | Rx# | 2， | 2 | Do not use |
| The high data rate | Rx# | 1 and | 1 | Using |
As mentioned above, owing to use duplexer, the processing of present wireless terminal in low data rate mode has limited performance.But the present invention isolates transmit path and RX path fully during low data rate tupe, and avoids using duplexer, the therefore feasible level and the wireless telephonic current drain that might reduce minimum detectable signal.
Though the preferred embodiments of the present invention are described in the above, but the professional and technical personnel will understand, under the situation that does not break away from the spirit of the present invention that limited by the accompanying Claim book and scope, can make various changes in form and details.
Claims (15)
1. a system that utilizes diversity technique to improve performance in high data rate wireless terminal comprises;
First transceiver, be used for the transmission and the reception of signal, the transmit button that this transceiver comprises second transmit path of first antenna, first RX path by duplexer, first transmit path by described duplexer, the described duplexer of bypass and is used for changing between described first and second transmit paths; With
Second receiver is used to receive high data rate, and this receiver comprises second antenna and second RX path.
2. be used for improving at high data rate wireless terminal the system of performance according to claim 1, wherein this first transmit path comprises:
Multiplier is used for the signal that spread spectrum sends;
Radio frequency band filter;
Driver;
Band pass filter; With
Be used to amplify the power amplifier that sends signal, be connected in series and send signal from this first antenna transmission by duplexer.
3. be used for improving at high data rate wireless terminal the system of performance according to claim 1, wherein this second transmit path comprises:
Multiplier is used for the signal that spread spectrum sends;
Radio frequency band filter;
Driver;
Power amplifier is connected in series and sends signal from this first antenna transmission.
4. be used for improving at high data rate wireless terminal the system of performance according to claim 1, wherein this first RX path comprises:
Low noise amplifier is used to amplify the signal of reception;
Band pass filter;
Multiplier; With
Radio frequency band filter is connected in series and receives the signal received from first antenna by duplexer.
5. be used for improving at high data rate wireless terminal the system of performance according to claim 1, wherein this first RX path comprises:
Low noise amplifier is used to amplify the signal of reception;
Band pass filter;
Multiplier; With
Radio frequency band filter is connected in series and receives the signal that is received from described first antenna.
6. be used for improving the system of performance according to claim 1, also comprise the microprocessor that is used to control transmit button at high data rate wireless terminal.
7. be used for improving the system of performance according to claim 1, also comprise being used to determine whether to take place the microprocessor that high data rate sends at high data rate wireless terminal.
8. be used for improving at high data rate wireless terminal the system of performance according to claim 1, wherein first and second antennas are helical antennas.
9. be used for improving at high data rate wireless terminal the system of performance according to claim 1, wherein first antenna is the helical antenna combined with whip antenna.
10. method of utilizing diversity technique in high data rate wireless terminal, to improve performance, this wireless terminal comprises: first transceiver, be used for the transmission and the reception of signal, the transmit button that this first transceiver comprises second transmit path of first antenna, first RX path by duplexer, first transmit path by described duplexer, the described duplexer of bypass and is used for changing between described first and second transmit paths; With second receiver, be used to receive high data rate, this second receiver comprises second antenna and the second receiver path, this method comprises:
Determine whether to take place high data rate transfer;
When determining high data rate transfer to take place, the set transmit button is so that be used on first transmit path in first transceiver, and comes received signal by public use first and second RX path; With
When determining high data rate transfer not to take place, the set transmit button is so that be used on second transmit path of bypass duplexer in first transceiver, and only utilizes second RX path in second receiver to come received signal.
11. as improve the method for performance as described in the claim 10 in high data rate wireless terminal, wherein microprocessor determines whether to take place high data rate transfer.
12. as in high data rate wireless terminal, improving the method for performance as described in the claim 10, the wherein switching of microprocessor control transmit button.
13. method of utilizing diversity technique in high data rate wireless terminal, to improve performance, this wireless terminal comprises: first transceiver, be used for the transmission and the reception of signal, the transmit button that this first transceiver comprises second transmit path of first antenna, first RX path by duplexer, first transmit path by described duplexer, the described duplexer of bypass and is used for changing between described first and second transmit paths; With second receiver, be used to receive high data rate, this receiver comprises second antenna and the second receiver path, this method comprises:
Determining whether to take place high data rate receives;
When determining that high data rate is taking place to be received, the set transmit button is so that be used on first transmit path in first transceiver, and comes received signal by public use first and second RX path; With
When determining that high data rate does not take place to be received, the set transmit button is so that be used on second transmit path of bypass duplexer in first transceiver, and only utilizes second RX path in second receiver to come received signal.
14. as improve the method for performance as described in the claim 13 in high data rate wireless terminal, wherein microprocessor determines whether to take place high data rate transfer.
15. as in high data rate wireless terminal, improving the method for performance as described in the claim 13, the wherein switching of microprocessor control transmit button.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/988,713 US6746157B2 (en) | 1998-08-24 | 2001-11-20 | Retainer and rolling bearing having the same |
| US09/988,713 | 2001-11-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1423423A CN1423423A (en) | 2003-06-11 |
| CN1194476C true CN1194476C (en) | 2005-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011453079A Expired - Fee Related CN1194476C (en) | 2001-11-20 | 2001-12-31 | System and method for improving high data rate wireless terminal characteristic using diversity |
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| Country | Link |
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| CN (1) | CN1194476C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013155494A1 (en) * | 2012-04-12 | 2013-10-17 | Skyworks Solutions, Inc. | Systems and methods related to improved isolation between transmit and receive radio-frequency signals |
| CN103442416B (en) * | 2013-08-23 | 2016-09-28 | 青岛海信移动通信技术股份有限公司 | A kind of method and device of data transmission |
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- 2001-12-31 CN CNB011453079A patent/CN1194476C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1423423A (en) | 2003-06-11 |
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Granted publication date: 20050323 Termination date: 20161231 |