TW577203B - A wideband multi-carrier code division multiplexing system using orthogonal complementary code - Google Patents

Abstract

A wideband multi-carrier code division multiplexing system using orthogonal complementary code employs orthogonal complementary code as the code division multiplexing multiple access subscriber code and use interleave overlap spread spectrum modulation method to achieve frequency spectrum expansion and multiple access. By means of high spectrum utilization efficiency of spread spectrum signal generated by interleave overlap spread spectrum modulation method and orthogonal complementary code taken as code division multiplexing multiple access code, both uplink and downlink channels free of multiple access interference can be guaranteed; moreover, the invention can control uplink and downlink data transmission speed and the data transmission speed can realize fully continuous modulated and proper customized data transmission speed for subscribers.

Description

• AV policy and Lu Ming's explanation [Technical field to which the invention belongs] / The present invention relates to a wideband multi-carrier orthogonal complementary code division code multiplex communication system, and in particular refers to a kind of orthogonal complementary code used as the division code multi-guard multiple The user code is extracted, and a dislocation overlapping spread spectrum modulation method is used to implement a wideband multi-carrier orthogonal complementary code division code multiplexing communication system with spread spectrum and multiple acquisitions. [Previous Technology] The success of the second generation of mobile communication systems around the world has changed the way people live. In recent years, the perfect voice transmission services provided by the second-generation mobile communications in many countries have made it a reality. In ", over ^ people became subscribers of GSM mobile phones. However, there are already hundreds of millions of people in mainland China who have mobile power at an annual rate of 2,000 people. This growth trend is expected to continue to occur around the world, especially in many developing countries. The success of the first generation of mobile communication systems has also paved the way for many developed countries to develop new generations of mobile communication systems. In May 2001, Japan launched the world's first: the third-generation mobile communication system based on W_CDMA technology for owed business service thieves. In addition to the voice and other low-speed services of the existing second-generation mobile communication system, the third-generation mobile communication system can transmit several multimedia services. At the end of 2001, the Taiwanese government will also require Fan Cheng to release the auction process, and hope to start the island's third-generation mobile communication service in 2003 to keep up with other developed countries around the world.

1¾1 As the third-generation mobile communication technology matures, it motivates us to think about the possible architecture of the next-generation mobile communication. Although at this time, no one can be sure what specific services can be provided by the system after the third generation mobile communication system, but it is certain that the system after the third generation mobile communication system must be able to provide better than the current It is about to be put into practical use of the third-generation mobile communication system for higher data transfer rates. Some people hope that the possible data transmission rate of the fourth generation mobile communication system is in the range of 10 to 100 Mbps. Based on this purpose, the general problem is how to ensure such a high data transmission rate in an extremely unpredictable and harsh mobile channel environment, and which wireless interface architecture can be used to transmit such a high data transmission service. . Taking into account the spectrum constraints of mobile communication systems globally available (in the range of a few hundred MHz to less than ioogHz), we believe that the most appropriate and feasible way to achieve the goals promised by the fourth generation of mobile communication is to use some possible Technology to further improve the bandwidth efficiency of the system. The present invention will propose a potential code division multiplex mobile communication system architecture, which can be used as a possible multiple acquisition technology for the fourth generation mobile communication. It is well known that all the second and third generation CDMA mobile communication standards now available (for example: IS_95 of the second generation and cdma200 (^ W-Cdma) of the third generation use the well-known direct sequence code The basic structure of multiplexing technology is that each bit is spread by a spreading code composed of N consecutive chips, and the \ 243 correction is supplemented to obtain a certain degree of processing gain. These The bandwidth occupied by the system is basically determined by the chip width used by the spreading code. Therefore, the present invention will define a parameter called π spreading efficiency " (spreading efficiency), the unit of which is The number of bits that can be transmitted to measure the bandwidth efficiency of the code division multiplexing system. Therefore 'all mobile communication systems based on the code division multiplexing technology, such as IS-95, cdma2000 and W-CDMA, have obvious spread spectrum benefits It is much smaller than i, or about 1 / N. It also explains why these systems cannot achieve better spread spectrum benefits. In recent years, the present invention is working on an answer that may improve the spread spectrum benefits of the code division multiplexing system. And this must be exploited A new spread-spectrum technology with complete complementary codes, taking into account the various restrictions on the implementation of an actual multiplexing system. First, the architecture of this multiplexing system must be capable of using current digital technology Achievable. Second, this new code division multiplexing system should avoid introducing too much multiple acquisition interference (MAI) 'to ensure a higher system capacity than the well-known code division multiplexing system. Third' The proposed architecture should have better resistance to frequency selective fading to mitigate multipath interference problems in the channel. The multi-carrier division code multiplexing based on orthogonal ^ full complementarity ^ is exactly this— This solution can meet all the requirements mentioned above. Because it uses two special signal designs in uploading and downloading, so in the present invention it will be confirmed that it can achieve the high-frequency bandwidth 577203. 'II_: 4 Utilization Rate and low bit error rate. The present invention will discuss the special aspects of the receiver design related to the new architecture. In the complementary code (CC) based code division multiplexing system architecture, the RAKE receiver is It works normally. To this end, the present invention will propose an adaptive recursive filter for detecting signals in a multi-path channel environment. The inventors of the present invention are The shortcomings and shortcomings of this project are eager to improve and innovate, and after painstaking and meticulous research, finally successfully developed this wideband multi-carrier orthogonal complementary code division code multiplexing communication system. [Abstract] The object of the present invention is to provide A wideband multi-carrier orthogonal complementary code division code communication system uses misaligned overlapping spread-spectrum modulation methods. The generated spread-spectrum signals have high spectrum utilization efficiency, which is higher than that of traditional spread-spectrum modulation methods. The resulting spread spectrum signal is Gaoxian, where N is the length of the spread spectrum code. The secondary-objective of the present invention is to provide a kind of wideband redundant orthogonal complementary code division code multi-guard communication system, which uses orthogonal complementary code as the division code multiplex multiple acquisition code, both in the upload and download channels, It is expected that there is no MAI interference. Another object of the present invention is to provide a wideband multi-carrier orthogonal complementary code division code multiplexing communication system, which can use a very simple square-up key and downlink transmission rate. The data transmission rate can achieve Continuously adjustable 'and H's wire times. From ㈣ to a few = 8 577203 ΙΛ transmission rate. In the W-CDMA standard, the user's data transmission rate must be controlled by a complex rate-matching algorithm, which is very inconvenient and = consumes a large amount of software and hardware resources, and it cannot support any arbitrary user expectations. Transmission rate (only an integer multiple of two). Another purpose of the present invention is to provide a wide-band multi-carrier orthogonal complementary code division code multi-X communication system, which is suitable for supporting domain and downlink asymmetric data communication services, so the + point is suitable for future mobile Internet Services. This feature of the present invention is also entirely due to the use of its own unique dislocation overlapping spread spectrum modulation method, so that users can freely adjust their own appropriate key-up and downlink data transmission rates without having to worry about the waste of wireless resources . Another object of the present invention is to provide a wideband multi-carrier orthogonal complementary code division code multiplex communication system, which adopts a misaligned overlapping spread-spectrum modulation method. The traditional RAKE receiver is used to receive signals in a multi-path channel. Therefore, a special feedback signal receiver is designed to complete the estimation of multi-path channels and the detection of signals. In order to achieve the purpose of the invention, a wideband multi-carrier orthogonal complementary code division code two = system is adopted, which uses orthogonal complementary code as the division code multiplexing multiple operation _, and borrows _ double two: = The spread-spectrum signal that realizes spread spectrum and multiple W chest generation has frequency-reporting utilization efficiency and uses orthogonal complementary code as the code division multiplexing and multiplexing. 577203 ： 9 Code fetching, no matter in the upload and download channels, 吝丨 It is guaranteed that there is no multiple fetching of interferons, and the present invention can control the transmission rate of the on-line eclipse, and the data transmission rate can be completely continuous. The ^ J tuning allows the user to adjust as appropriate. Shell material transfer rate. Moreover, the present invention also provides T 1 special feedback signal receiver 'to complete the estimation of multi-path channels and signal detection. [Embodiment] ▲ A wideband multi-carrier orthogonal complementary code division code multiplex communication system provided by the present invention is described in the following two aspects: ^ Operation under multiple acquisition interference The operation of the industrial system under the AWGN channel is shown in Figure-and Figure 2. This is a simple signal diagram of the two-user system downloading and uploading; and two users one, two i, 2 use two users-two-element code group 11, 12, 21, 22 ( element codes) as its signature code; the information bits are used after the user ’s one, two element horses, and 11, 12, 21, 22 spread-spectrum modulation, and do, shift overlap ,, ( 〇Hold ked), which means shifting one cMp between the mother's bits and then overlaying them. Compared with the traditional spread spectrum modulation technology used in general code division multiplexing systems, the present invention has the following features: The most obvious is that the bit stream in the present invention will no longer be arranged one after the other in order. Instead, a new bit will start with a chip delay time relative to the previous bit. "This bit is spread by the element code of length L; another important characteristic about the new division multiplexing technology is: this shift overlap overlap spread spectrum modulation technique 577203 S2.11 2A-C ' ... λ is a mode suitable for multi-rate data transmission Various needs in multimedia services, and in the third generation of mobile communication standards, this is called, rate matching "(rate-matching); Use the displacement of more than one chip delay (maximum L chips) between two adjacent bits to easily reduce the data transmission rate; if the delay between two adjacent bits increases to L chip length, the new system It will reply to become a general code division multiplexing system, and will produce the lowest data transmission speed.

rate. In other words, the highest data transfer rate will occur when the delay between two adjacent shifted overlapping bits is only one chip long. In this case, the spread spectrum efficiency will reach the highest value, and each chip will have the ability to carry a bit of information through the channel. When the bandwidth of a sub-code multi-guard system is determined by the ehip width used by the spreading code, a higher spreading efficiency represents a higher bandwidth benefit. Therefore, a new code division multiplexing system frame has been proposed.

The architecture has the ability to have higher bandwidth efficiency under the same processing efficiency than the traditional code division multiplexing architecture. The emphasis is that the sub-code multi-jade system of the present invention can provide multi-rate and multi-media services based on its unique shift-overlap spread-spectrum technology. In the current W-CDMA architecture of third-generation mobile communications, a complex and unreliable rate matching algorithm must rely on selecting the appropriate OVSF orthogonal code group, and according to the spreading factor and The required transmission rate to adjust the data transmission rate. In the present invention, the multi-code division multiplexing is sufficient. Η. Η Complementary system can deliberately change the data transmission rate... No frequency factor to find the appropriate and special code group. We have changed θ to shift the bit gates adjacent to each other, and changed them at least three days later. The UP delay was lowered to reduce or increase the data transmission rate. There will be no more calculations, and this is exactly what we see when the transmission material changes. And the change of its transmission rate is no longer a multiple of two (in the W-CDMA standard, Tan private, ancient, and reference ^), the change can only be a multiple of two. , And cannot be continuously adjustable). As can be seen from Figures 1 and 2, because the CC code group is used on the new code division multiplexing architecture, such transmission is performed in the AWGN channel when it is transmitted (synchronized channel) and uploaded (phased channel). Unaffected by multiple acquisitions. In Fig. 2, it has been assumed that the mutual delay between the two households-2 and 2 is an integer of _ length. "This assumption is not valid, and the simulation results of the present invention also show that the degree of multiple acquisition interference is also much smaller than the traditional Code multiplexing system. It must be emphasized that by adjusting the number of chip delays between two adjacent shifted overlapping bits, the operation of the proposed code division multiplexing system under the AWGN channel without interference from multiple acquisitions will not be affected. The non-multiple acquisition interference operation under the AWGN channel is very helpful to improve the system capacity, because the system capacity is usually limited by co-channel interference. What must be pointed out in Figures 1 and 2 is that for each user's identification code group, two users have one or two element code groups 11, 12, 21, 22 (element code) 12 577203 ___ month 9 Modification _ Supplementary ~ Carrier frequency fi and β incoming, as shown in the figure ^. Therefore, this means that the proposed code division multiplexing system architecture is a multi-carrier code division multi-system, and has various characteristics of the first carrier code division multiplexing system, such as reducing frequency selection attenuation effects through a frequency multiple selection mechanism. Wait. In addition, the present invention can also use orthogonal carrier groups, where two or two are staggered from each other by 1 / Tc (here Tc stands for medium length), in order to further improve the bandwidth efficiency of the system.

Among multiple acquisition interference and AWGN channels, the bit error rate (BER) of the code division multiplexing system proposed by the present invention is a value obtained by computer simulation. The bit error rate performance obtained under the code division multiplexing system of the present invention will be under the same operating loop disturbance, and the traditional code division using the traditional Gold code group and μ sequence code group

Compare with multiplexed systems. For each system mentioned here, we use a matched filter (single-correlator) as the receiver. In the simulation of the upload channel and the download channel, both different numbers of users and processing benefits are considered simultaneously. Figures 3 and 4 show the results we have obtained. The former shows that the processing benefit is 64 ′ for the cc code group and the processing efficiency for the Gold code group and the M code group.

Comparison of bit error rate performance performance of the downstream (synchronous) channel with a physical benefit of 63. The latter obtains the bit error rate under the upload (asynchronous) channel, and the delay between its users is 3 ehips. The error rates of these two graphs are predetermined as the error rate of the first user, and the same error rate results will also be reflected in the signal reception to other users. From Fig. 3 and Fig. 4, it can be observed that, compared with the conventional code division multiplexing system proposed in the present invention, a gain of at least 3dB 13 577203 m: can be obtained. For the new multiplexing system, one of the most significant features is that its almost fixed bit error rate performance (as shown in Figure 3) is not affected by the number of users in the channel. In these two performances, The curves of different user numbers (single user and four user respectively) are almost completely overlapped, and it also shows that the proposed code division multiplexing system is not affected by multiple acquisition interference. 2. Operation in multi-path channels Regarding the performance of the code division multiplexing system proposed in the present invention under multi-path channels, the description is as follows: The receiver in the traditional code division multiplexing system is usually used to collect data in different channels. The reflected energy is dispersed in the reflection path to achieve multi-path multiple selection in the receiver. Therefore, the rake receiver is necessary for all traditional code division multi-u, including the currently proposed second and third generation mobile communication architectures, such as IS_95, umTSW_cdma, and cdma20 standards. However, in the code division multiplexing system proposed by the present invention, the RAKE receiver is useless under the new code division multiple guard architecture due to the unique spread spectrum technology. In the code division multiple-guard system proposed by the present invention, the use of a phase-capable receiver will still lead to a simple bit error rate (using three reflection paths of the same intensity), which is obviously unacceptable. Therefore, using the proposed code multiplexing architecture under multiple path interference requires a new receiver for signal reception. The adaptive recursive multipath receiver is specially designed for the code division multiplexing architecture based on CC code group 577203. As shown in Figure 5, the receiver here is a multi-channel impulse response estimator. The multi-channel signal receivers 3 and 4 are composed of two key modules. The multi-channel impulse response estimator 3 is used to estimate the channel impulse response, and the multi-path signal receiver 4 is used to generate signals in the same phase and from different paths of the scholar in order to generate a signal that has Enhanced decision variables. In order for the adaptive recursive filter to operate effectively, a designated pilot signal should be added to the signal system of the proposed multiplexing system. In the download channel transmission, this signal should be spread by a pilot code group that is different from the code group used by other users. In the upload channel transmission, this signal should be inserted into the user data box in a time-sharing 5, as shown in Figure 6. As for the differences in the download and upload channels of the pilot signal 6, it will be mentioned in the text later. The downlink transmission process is transmitted by the same source (base station) on a synchronized channel. Therefore, a pilot signal 6 of a specified code group is reasonable. Considering a strong pilot signal 6, it is helpful for mobile phones. To lock the control channel. On the other hand, the uploaded transmission process # is transmitted by different sources (mobile phones) on asynchronous channels. Therefore, if each mobile phone is given two code groups, one is used for data transmission and the other is used to transmit the pilot signal 6, which will waste a lot of code groups. Therefore, when uploading the channel, the pilot signal 6 and the data are arranged in a time-sharing manner. As shown in Figure 5, the same recursive filter can be used for signal impulse response estimation during download and upload, as long as the receiver can achieve synchronization with the data frame of the received signal. In fact, the pilot signal in the download and upload channels is composed of a series of short pulses, and their lengths (Tdl and Tul) should only be slightly longer than the maximum channel delay spread, and their update periods (Td2 and Tu2) should be Coherence time shorter than the channel to adapt to the time-varying effect of the mobile channel. The recursive multi-path receiving filter mentioned in the present invention has several advantages: The structure is simple and flexible, and only two transversal filters are used to form its 乜 U, one is used for channel impulse response estimation, and the other is Data detection households use flute first, recursive filter and pilot signal 6 will be able to smoothly and accurately estimate the channel impulse response, which can be seen in subsequent results. Multi-path channel equalization and signal coherence synthesis can be combined and implemented in the proposed system using a simple hardware architecture. Third, the adaptive operation of the recursive multi-path receiver is suitable for channel characteristics with high variability without the need for main channel parameters, such as the relative delay and relative strength between different paths. In contrast, common RAKE receivers of code division multiplexing systems require path gain coefficients to be combined at the maximum ratio (maximal ratiocmbining), and the path gain coefficients are usually unknown parameters, so other complex algorithms are required. To estimate. The performance of the code division multiplexing system architecture proposed in this volume, combined with the performance of the recursive filter in multipath channel signal reception, is shown in Figures 7 and 8, two typical situations are considered here; The performance of uploading is similar to the comparison between multiple acquisition interference in Figure 3 and Figure 4 and the performance comparison in the channel Zhao Zhao. It can be seen from the figure that, in terms of the bit error rate of the synchronous download channel, Goid 577203 92. ii 24 code group is better than the M sequence code group; on the contrary, as for the asynchronous upload channel, the Gold code group And M sequence has almost the same performance. However, the code division multiplexing system based on CC code group can easily outperform the performance of any general code division multiplexing system using Gold code group and M sequence code group. As shown in Figure 9, this figure shows how the shift-overlap spread-spectrum modulation method can change the number of shifted chips between two adjacent bits to support three different data transmission rates (the rates are 1, 4/3, and 4) The schematic diagram is mainly used to explain the use of this system to achieve continuous variable data transmission rate without changing the user code. The figure shows three different data transmission rates, as shown below: 1 · Above: the lowest data transfer rate, that is, one unit transfer rate; 2. Middle: 4/3 unit data transfer rates; 3. Bottom: the highest achievable data transfer rate, that is, four unit transfer rates (due to The figure uses a complementary code with a subcode length of four). As shown in Figure 10, it is a schematic diagram showing how the system architecture supports asymmetrical data transmission. This is mainly to explain the use of the system in the upload and download channels' by adjusting the adjacent two bits The number of overlapping complementary code subcodes makes it very easy to achieve asymmetric data transfer rates. The figure shows three different data transfer rates, as shown below: 1. Upper picture: adjacent two-bit complementary coders The number of ehips with zero code overlaps corresponds to the lowest data transmission rate, that is, a unit transmission rate; 17 577203 92.11 24. The number is three, which corresponds to the highest achievable data transmission rate, that is, four unit transmission rates (because the complementary code with a subcode length of four is used in the figure). As shown in Fig. 10, the transmission and reception architecture diagram of the proposed multi-carrier division code multiplexing system based on the proposed CC code group (from the transmitter of the mobile phone to the receiver of the base station) is mainly composed of three main The composition is as follows:

1 · Upper block · Block diagram of system implementation of multi-carrier complementary code overlapping modulation and code division multiplexing system in the upload channel; 2 · Central · · Detailed schematic diagram of single subcode overlapping modulation spread spectrum modulator; 3 · Bottom: detailed schematic diagram of signal detection filter. As shown in Figure 12, it is the transmission and reception architecture diagram of the proposed CC code group-based multi-carrier division code multiplexing system (from the transmitter of the base station to the receiver of the mobile phone); it is mainly composed of three The main parts are as follows:

1 · Upper block · Block diagram of system implementation of multi-carrier complementary code overlapping modulation and division code multiplexing system in the downlink channel; 2 · Middle: detailed schematic diagram of single sub-code overlapping modulation spread-spectrum modulator; 3 · lower part : Detailed schematic diagram of the signal detection filter. "The present invention provides-" Broadband multicarrier orthogonal complementary code & code multiplex communication system, compared with other commonly used technologies, has the following advantages: First, the broadband multicarrier orthogonal complementary code division of the present invention The code multiplex communication system 'uses a dislocation overlapping spread spectrum modulation method, and the generated spread spectrum signal has a year of 18,577,203. The middle N produced by the traditional spread spectrum modulation method is the length of the spread spectrum code. No matter whether the communication system is in the above reference) a wideband multi-carrier orthogonal complementary code division code multiple system of the present invention, the orthogonal complementary code is used as the division code multiplexed multiple acquisition code, and the channel channel can be transmitted and downloaded. No multiple acquisition interference exists (the ancestor I exists. A present invention < wideband multi-carrier orthogonal complementary code division code multiplex communication system 'can control the data transmission rate of the uplink and downlink in a very simple way 'The data transmission rate can be completely continuously adjustable, and is not necessarily an integer multiple of two. In order to achieve "calable data transmission rate. In the W-CDMA standard, the use of $ 夕": 欠 刺 h T The user's transmission rate must use a complex rate-matching algorithm to control the adjustment, which is very inconvenient and consumes a lot of software and hardware resources. It also cannot support any transmission rate that the user expects. 4. The broadband multi-carrier orthogonal complementary code division code multiplexing communication system of the present invention is suitable for supporting asymmetric data communication services of the up-key and the down-chain, so the + points are applicable to the future mobile Internet. Service content. This point of the present invention is also completely the reason for using its own unique dislocation overlapping spread spectrum modulation method, so that users can freely adjust their own appropriate uplink and downlink data transmission rate 'without having to worry about wireless resources The problem of waste. 5. The wideband multi-carrier orthogonal complementary code division code multiplex communication system of the present invention 577203

Therefore, traditional RAKE cannot be adopted. Therefore, a special system is specially designed. Because of the misalignment and overlapping spread spectrum modulation method, the receiver receives the signals in the multi-path channel to form an estimation of the multi-path channel and the return of the signal gate. Receiver signal detection. The above detailed description is a specific description of one of the feasible embodiments of the present invention, but this embodiment is not intended to limit the scope of the patent of the present invention. Any equivalent implementation or change that does not depart from the technical spirit of the present invention should be included in Within the scope of the patent in this case. As shown in the above, this case is not only technically innovative, but also can enhance the above-mentioned multiple effects compared with the conventional code division multiplex communication system. It should have fully met the requirements for novel and progressive statutory invention patents. I filed an application in accordance with the law, and kindly ask your office to approve this patent application for invention to encourage invention and to feel good. [Brief description of the drawings] Please refer to the following detailed description of a preferred embodiment of the present invention and the accompanying drawings' to further understand the technical content of the present invention and its purpose and effect; the drawings related to this embodiment are: Figure 1 This is a signal schematic diagram of a wideband multi-carrier orthogonal complementary code division multiplexing communication system when the user downloads; using a CC code group of 4 in a two-user division multiplexing system, multiple acquisitions are performed on the downlink. Interference-AWGN channel; User 1 is the user to be detected; Figure 2 is a signal diagram of the wideband multi-carrier orthogonal complementary code division code multiplex communication system when the user uploads it; using a CC code length of 4 is used in the second use 20 577203 households' code division multiplexing system, upload multiple acquisition interference _AWGN channel; user 1 is the user to be detected; Figure 2 shows CC code group-based code division multiplexing and traditional code division multiplexing systems. Comparison of the bit error rate in the multiple acquisition interference-AWGN channel transmission and the use of matched filter receivers in the downstream transmission; Gold code and M sequence code length 63, CC code length 4 * 16; Figure 4 shows the CC code Group-based code division multiplexing System and traditional code division multiplexing system in multiple acquisition interference _AWGN channel transmission, and using a matched filter to call the receiver to upload a comparison chart of bit error rate; Goll code and M s call this code code length 63, CC The code length is 4 * 16; Figure 5 is the architecture diagram of the recursive multipath signal receiving filter used by the CC code group based code division multiplexing system in the downlink channel signal reception; the upper part is the flood signal detection filter The lower part is the channel impulse response estimator. Figure 6 is a schematic diagram of the signal arrangement of the CC code-based multiplexing system for downloading and uploading channels; a designated pilot signal channel is used for downloading, and the pilot is for uploading. The signals and data are arranged in a time-sharing manner. Figure 7 shows the transmission of the bit error rate (BER) in the downlink (synchronous) multipath channel of the CDMA code group-based CDMA system and the traditional CDMA system. Comparison chart; multi-path channel is normalized power; delay between paths is equal; relative strength of multi-path channel path = [1 · 35, L ◎ current processing gain lion 4; CC code is used for GO and M sequence codes The group uses a recursive filter; 21 577203 (Comparison of the transmission of bit error rate (BEr) in the upload (non-synchronous) multipath channel based on the X code group-based multicode n and the traditional multicode system; first, the multipath channel is normalized. G-force sheep, inter-path delay = 3 chips; relative strength of multi-path channel paths = [1 · 35 los >, · 08, 〇 · 13]; processing gain = 63/64; use of Goki codes and M sequence codes MRC-RAKE · a & The CC code group uses a recursive filter; Figure 9 shows how the shift-overlap spread-spectrum modulation method can change the number of chips between two adjacent bits to support 3 Schematic diagram of different data transmission rates (rates are U / 3 and 4 respectively); simply consider that each user gives two codes as the # identification code group and the element code length is 4; Figure 10 is a diagram showing how the system architecture supports Schematic diagram of asymmetric data transmission; upload at a slower rate with a rate of 1; download at a faster rate with a rate of 4; consider each user to give two codes as the identification code group and the element code length is 4; Figure 11 shows the proposed CC code group-based multi-carrier Transmitter to receiver of the base station) transmission diagram of the receiving and receiving architecture; all the building blocks in the figure depict the hardware blocks of the transmitter and receiver; and Figure 12 is based on the proposed CC code set Multi-carrier code division multiplexing system transmission (receiving from the base station transmitter to the mobile phone receiver) transmission and reception architecture diagram; all the building blocks in the figure are shown as the transmitter and base station to the mobile phone Receiver hardware block. [Representative symbols of main parts] 22 577203 1 user 1 11 user 1 element code group 12 user 1 element code group 2 user 2 21 user two element code group 22 user two element code group 3 multi-channel impulse response estimator 4 multi-channel Via Signal Receiver 5 User Information 6 Pilot Signal

twenty three

Claims (1)

Scope of patent application: 1. A wideband multi-carrier orthogonal complementary code division code multiplex communication system, which is a hardware architecture of a spread spectrum modulator using complementary code shift and overlap spread spectrum technology. It consists of a bit register, a delay unit, a multiplier, and an adder. The information bits are shifted and overlapped by the element code spreading tone, that is, the number of shifts between the mother bit and another bit ( The minimum is one and the maximum is L) chip lengths; the bit stream is no longer arranged one by one. In the system that uses the complementary code shift overlap spread spectrum technology, the first bit is the last bit. The new bits will be arranged after only a few (minimum one, maximum L) chip delays, and each bit will be spread with an element code (eiement c0 (je) of length L). 2 · A wideband multi-carrier orthogonal complementary code division code multiplexing communication system as described in item i of the patent application range, in which the spread spectrum modulator has the ability to support variable rate transmission in the downlink and upload channels. Complementary code multiplexing system is also characterized by: The spread-spectrum frequency modulation method is particularly suitable for multi-rate data transmission to respond to the different needs of multimedia services. This algorithm is called rate-matching in the third-generation mobile communication standard; using complementary code The special shift overlap spreading method of the code division multiplexing system can easily reduce the transmission rate as long as the displacement between two adjacent shift overlap bits exceeds a Chip length (up to £ chip length); if The displacement between two consecutive bits is L · chip length, then the system will return to the traditional code division multiplexing system with the lowest transmission rate of 24. If two adjacent shifted bits overlap The maximum transmission rate can be reached by shifting the length of i chlp. As described in the first item of Shenjing's patent scope-a wideband multi-carrier orthogonal complementary Margin code multiplex communication system, which uses n different carriers to Send each symbol (symbol); that is, the identification code group used by each user contains n elements, and the saber is transmitted by different carriers, β, ..., fo, where ^ is the element code group required by each user Number. That is, The new CDMA multiplexing architecture is a multi-carrier CDMA multiplexing system. It has all the characteristics of a multi-carrier CDMA multiplexing system. For example, orthogonal carrier waves can be used to transport all element code groups of the same user. The bandwidth efficiency of the system is further improved, and the distance between adjacent carriers is 1 / Tc (Tc is the chip width). As described in the scope of patent application! Item A wideband multi-carrier orthogonal complementary code division code multiplex communication system, The adaptive recursive multipath receiver is an adaptive recursive multipath receiver filter, which is a receiver composed of two main modules; one is used to estimate the impulse response of the channel, and the other is used for coherence. Combining the signals of different paths, an enhanced decision variable is generated before the decision device. For example, the scope of patent application is the highest! Item described in a wideband multi-carrier orthogonal complementary code division multiplexing communication system, in which the spread-spectrum modulator and adaptive recursive multi-path 4-pass reception filter designed for cc code division code multiple I system Device, download and upload in a code division multiplexing system using complementary codes 577203 One by one, the pilot signal of one channel is transmitted; the pilot signal of the download channel is spread by a set of identification codes different from those of other user data channels; in the upload channel, the pilot signal should be separated from the user's data frame. When the receiver can achieve synchronization with the data frame of the received signal, the same recursive wavelet can be used to estimate the channel impulse response in the downlink and upload channels; the downlink and upload channels The pilot signal is composed of a series of short pulses, whose lengths (Tdi and Tul) should only be slightly longer than the maximum channel delay spread, and their update periods (Td2 and Tu2) should be shorter than the channel's coherence time To track the time-varying effects of the action channel. 6. A wideband multi-carrier orthogonal complementary code division code multiplexing communication system as described in item 1 of the scope of patent application, wherein the spread-spectrum modulator and the adaptability designed for the cc code division code multiplexing system Recursive multi-path receive filter, and the timing format of pilot and data signals for download and upload channels designed for CC code division multiplexing systems. The transmission and reception architecture (from the mobile phone transmitter to the base station receiver) consists of two main bodies, the transmitter and the receiver; the transmitter consists of n shift-overlapping spread-spectrum modulators and n It adopts (L + 1) -QAM carrier modulator. The receiver consists of η adopting (L + 1) -QAM carrier demodulator and adaptive recursive multipath receive filter for upload loop. 26 577203 7_ A wideband multi-carrier orthogonal complementary code division code multiplexing communication system as described in item 1 of the scope of patent application, wherein the spread-spectrum modulator, and The adaptive recursive multipath receiving filter designed by the CDMA multiplexing system, and the timing format of the pilot and data signals of the download and upload channels designed for the CC CDMA multiplexing system are complementary. The transmission and reception architecture of the multi-carrier multi-code division multiplexing system of the code (from the base station's transmitter to a mobile phone's receiver to the mobile phone's receiver). It consists of n shift-overlapping data signal spread-spectrum modulators using complementary codes, n shift-overlapping pilot signal spread-spectrum modulators using complementary codes, and n using (L + 1) _QAM carrier modulators; The receiver is composed of η adopting (L + 1) _QAM carrier demodulator and adaptive recursive multipath receiving filter for the downlink. 8. A wideband multi-carrier orthogonal complementary sabre code communication system as described in item X of the patent application scope, wherein the architecture of the shift-overlap spread-spectrum modulator is based on a tapped delay line architecture; In the modulator, the & point is the input point, and the b point is the output point. 9 · A wideband multi-carrier orthogonal complementary code division code multiplex communication system as described in item 丨 of the patent application scope, wherein the spread spectrum modulator of the spread spectrum technology uses a (L + 1) -QAM (where l is the length of each element code of the complementary code) The structure of the carrier modulator is used to implement the carrier modulation of the multi-carrier amplitude spread-spectrum baseband signal, which is based on ιι ([+ 1) ^ αμ + (which + n is Compose 27 577203 92.11. 24 The number of element codes required for a complementary code), each (L + 1) -QAM carrier modulator is used to transmit the spread signal by an element code. 28