CN1414724A - High speed CDMA radio communication network - Google Patents
High speed CDMA radio communication network Download PDFInfo
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- CN1414724A CN1414724A CN01132032A CN01132032A CN1414724A CN 1414724 A CN1414724 A CN 1414724A CN 01132032 A CN01132032 A CN 01132032A CN 01132032 A CN01132032 A CN 01132032A CN 1414724 A CN1414724 A CN 1414724A
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- base station
- radio communication
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- wireless network
- cdma radio
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Abstract
A high-speed CDMA radio communication net includes at least one CDMA base station and a couple of radio network terminals in the area covered by the base station. The base band signal process uses the same WALSH code spread spectrum mode with less bit number and the same coding mode numatter where the transmission is from the base station to radio network terminals or from terminals to the base station. The said WALSH code can be bit of 2,4,8, 16, or 32. The said coding mode can be convolutional coding or TURBO coding and the modulating mode can use the standards in IS-95, ie QPSK modulating mode for transmission from the base station to radio network terminals and OQPSK modulating mode for tansmission from radio network terminals to the base station.
Description
Technical field
The present invention relates to wireless communication technology field, particularly relate to a kind of cdma wireless communication net.
Background technology
Mostly existing C DMA (code division multiple access) wireless communication networks is the IS-95 standard if adopting, in the communicating by letter of wireless network terminal (as the CDMA mobile phone) in its base station and its area of coverage, on base band signal process, forward direction (promptly transmitting to wireless network terminal from the base station) adopts 64 Walsh sign indicating number spread spectrum, and adopt the QPSK mode to modulate, oppositely (promptly from wireless network terminal to base station transmits) then adopts the long code spread spectrum, and adopt the OQPSK mode to modulate, why oppositely adopt the long code spread spectrum that 242 kinds of codings are arranged, be because consider that the CDMA cellphone subscriber's is numerous, its reverse transfer has very big uncertainty, therefore but the shortcoming of bringing is that the data transmission rate of individual channel is low, the voice call that just in time is suitable for low speed is used, as the IS-95A system, for solving the high-speed communication demand, the IS-95B system has adopted channel binding technology on the basis of IS-95A, can make the flank speed of air interface reach 76.8kbps (rate set 1) and 115.2kbps (rate set 2), but the expense of deduction protocol fields, real data transmission rate has only 68.8kbps (rate set 1) and 106.8kbps (rate set 2), and the realization of IS-95B system, its overhead is very big.
And on the other hand, in actual applications, such situation is arranged, in the little zone of area, need to carry out radio communication at a high speed, and its wireless network terminal and few, if use the IS-95B system therein, its relative cost is just too high.
Summary of the invention
Technical problem to be solved by this invention provides a kind of high speed CDMA radio communication network that is fit to be applied to have only a small amount of wireless network terminal in the zonule.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: high speed CDMA radio communication network comprises at least one cdma base station and several wireless network terminals in its area of coverage, it is characterized in that on base band signal process, no matter be to transmit to wireless network terminal from the base station, still wireless network terminal all adopts identical figure place less Walsh sign indicating number spread spectrum mode and identical coded system to base station transmits.
Described Walsh sign indicating number can be 2,4,8,16 or 32;
Described coded system can adopt convolutional encoding or TURBO coding;
And modulation system still can adopt the standard among the IS-95, promptly adopts the QPSK modulation system from the base station to wireless network terminal transmission, from wireless network terminal to base station transmits OQPSK modulation system.
Compared with prior art, the present invention has only in the zonule under the situation of a small amount of wireless network terminal, only need less overhead just can realize the high-speed communication that communication network is interior, as adopting 8 WALSH sign indicating number to link in forward link and back, then single channel makes the single-channel speed of IS-95 can reach 76.8kbps (rate set 1), real data transmission rate also can reach 73.6kbps (rate set 1), and that it sets up cost is much lower relatively.Therefore the present invention can be used as the inner high speed communication network in individual cell territories such as school, hospital, military camp, large-scale company, and as need to realize and extraneous high-speed communication, as long as then add and their interface.
Description of drawings
Fig. 1 is the schematic diagram of the embodiment of the invention.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
As shown in Figure 1, be one embodiment of the present of invention, wherein from the base station 2 to the forward link of wireless network terminal 11,12 transmission with from wireless network terminal 11,12 back to base station 2 transmission to link, all adopt 8 WALSH sign indicating number spread spectrum, and all adopt convolutional encoding, but on modulation system, forward link adopts the QPSK modulation system, and the OQPSK modulation system is adopted to link in the back, the base station is under the situation of three sector configuration, and every base station can be satisfied 20 users' access at most.
When this high speed high speed CDMA radio communication network need be with the high-speed communication of external network 4, then as long as between them, connect by interface 3.
Claims (4)
1, a kind of high speed CDMA radio communication network, comprise at least one cdma base station and several wireless network terminals in its area of coverage, it is characterized in that on base band signal process, no matter be to transmit to wireless network terminal from the base station, still wireless network terminal all adopts identical figure place less WALSH sign indicating number spread spectrum mode and identical coded system to base station transmits.
2, high speed CDMA radio communication network according to claim 1 is characterized in that described WALSH sign indicating number can be 2,4,8,16 or 32.
3, high speed CDMA radio communication network according to claim 1 is characterized in that described coded system adopts convolutional encoding or TURBO coding.
4, according to claim 1 or 2 or 3 described high speed CDMA radio communication networks, it is characterized in that from the base station adopting the QPSK modulation system to the wireless network terminal transmission, from wireless network terminal to base station transmits OQPSK modulation system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01132032A CN1414724A (en) | 2001-10-26 | 2001-10-26 | High speed CDMA radio communication network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01132032A CN1414724A (en) | 2001-10-26 | 2001-10-26 | High speed CDMA radio communication network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1414724A true CN1414724A (en) | 2003-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN01132032A Pending CN1414724A (en) | 2001-10-26 | 2001-10-26 | High speed CDMA radio communication network |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1874331B (en) * | 2005-06-01 | 2011-06-08 | 美国博通公司 | Baseband processing module for radio frequency transceiver , and method of execution of turbine decoding operation |
| CN102388540A (en) * | 2009-04-11 | 2012-03-21 | 高通股份有限公司 | Apparatus and methods for interleaving in a forward link only system |
| US8982832B2 (en) | 2008-04-28 | 2015-03-17 | Qualcomm Incorporated | Wireless communication of turbo coded data with time diversity |
-
2001
- 2001-10-26 CN CN01132032A patent/CN1414724A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1874331B (en) * | 2005-06-01 | 2011-06-08 | 美国博通公司 | Baseband processing module for radio frequency transceiver , and method of execution of turbine decoding operation |
| US8982832B2 (en) | 2008-04-28 | 2015-03-17 | Qualcomm Incorporated | Wireless communication of turbo coded data with time diversity |
| CN102388540A (en) * | 2009-04-11 | 2012-03-21 | 高通股份有限公司 | Apparatus and methods for interleaving in a forward link only system |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |