KR20000073908A - Receiving apparatus in cdma type wireless telephone set and method thereof - Google Patents

Abstract

PURPOSE: A receiver of a code division multiple access(CDMA) wireless terminal is provided to sequentially arrange signals obtained through multi paths to pseudo-noise(PN) back diffusing blocks firstly, couplers secondly, Walsh demodulating blocks thirdly, and multiplexers finally, so as to make the receiving device applied to an international mobile telecommunication-2000(IMT-2000). CONSTITUTION: Many pseudo-noise(PN) back diffusing blocks(600,601,602) apply PN back diffusing processes to in-phase(I) channel signals and quadrature(Q) channel signals inputted through many paths. A first coupler(610) couples the PN back-diffused Q channel signals. A second coupler(620) couples the PN back-diffused I channel signals. Many Walsh demodulating blocks(630,631,632) separate the signals outputted through the first and the second coupler into many channels. Many third couplers(multiplexers)(640,641,642) couple the Q channel signals with the I channel signals, and output the coupled Q/the I signals.

Description

Receiving apparatus and method for wireless terminal using code division multiple access method {RECEIVING APPARATUS IN CDMA TYPE WIRELESS TELEPHONE SET AND METHOD THEREOF}

The present invention relates to a transmitter of a wireless terminal using a code division multiple access (CDMA: code division multiple access) method, and in particular, can also be applied to IMT (IMT: INTERNATIONAL MOBILE TELECOMMUNICATION) 2000. The structure of the transmitter is located after the demodulation block (WALSH DECOVERING BLOCK or "Walsh demodulation block") after the combiner (COMBINE or "combiner").

FIG. 1 is a block diagram for compensating and collecting delays of a queue channel and an eye channel coming into a multipath of a receiver using a conventional code division multiple access scheme.

2 is a Walsh demodulation block diagram for separating channels of a receiver using a conventional code division multiple access scheme.

3 is a block diagram for merging data transmitted by multiple carriers using a conventional code division multiple access scheme.

4 is a block diagram for despreading (hereinafter, referred to as "despreading") according to a conventional code division multiple access scheme.

5 is a block diagram of a transmitter according to a multicarrier (MULTI CARRIER) using a conventional code division multiple access scheme.

In general, a RAKE RECEIVER of a Qualcomm MSM (MOBILE STATION MODEM) has a structure capable of demodulating only one channel at a time. Therefore, three fingers (FINGER) for catching the multipath components of one channel and a combiner for combining the multipath components into one. This structure is not available in the IMT-2000, the third generation mobile communication in which data is transmitted on multiple channels using multiple carriers due to the large amount of data to be processed. The above reason is not suitable as a structure in which the basic channel FUNDAMENTAL CHANNEL, the supplemental channel, the dedicated control channel, and the like must be demodulated.

Therefore, in IMT-2000, several fingers are required for each carrier, and Walsh demodulation blocks are required for each finger as many channels to be processed simultaneously. Also, as many as the number of combiner blocks are needed, in this structure, the redundancy increases in implementation. In addition, if the Walsh demodulation block uses one finger, multipath diversity gain cannot be obtained because one finger must be allocated to one channel to demodulate multiple channels.

As shown in FIG. 1, the block configuration of a transmitter using a code division multiple access scheme compensates for delays of I channel and Q channel data coming through multiple fingers and combines them again. PN demodulation blocks (100, 120, 130) demodulate the input signal and are coupled by I and Q channel combiners 140, 150 through combiners 140 and 150. At this time, the output data is output through a plurality of Walsh demodulation blocks 201, 202, and 203 and MUX 220, 230, and 240 for merging I and Q channels in order to separate channels. In this case, if multiple carriers are used, another MUX 350, 360, and 370 must be provided as shown in FIG. 3 to combine the transmitted data. 4 is a block diagram illustrating in detail the structure of the finger 400 as described above. The I data or Q data on each channel is synchronized with the DES 430 and despread by the PN demodulator 440 by the PN generator 420. The PN despread signal is orthogonal demodulated again via Walsh generator 410. The output signal is then passed to a DESKEW 480 through a SYMBOL PROCESSOR 460. 4 illustrates despreading and demodulating blocks of one finger 400. In the conventional IS-95, three fingers 400 are required because three fingers 400 are required. However, in the case of the IMT-2000 which uses multiple carriers and needs to demodulate several channels, the number of blocks shown in FIG. 4 is required for each carrier. And as many Walsh demodulation blocks as there are channels are needed at the same time. In the IMT-2000, a rake receiver is not implemented, but a finger 400 capable of multipathing for each carrier is required, and a Walsh demodulation block of the required channel is required for each finger 400. Therefore, when combined after Walsh demodulation in the conventional receiver structure, there is a problem in that a number of mux and Walsh demodulation blocks are required as shown in FIG. In addition, in the IMT-2000 using multiple carriers, three more block structures as shown in FIG. 5 are required, and there is a problem in that MUXs for combining signals for each channel are required as many as the number of channels.

Accordingly, an object of the present invention is to provide an apparatus and method for a code division multiple access method that can be easily implemented.

Another object of the present invention is to provide a multi-carrier receiving apparatus and method applied to IMT-2000.

It is still another object of the present invention to provide a receiving apparatus and method capable of obtaining diversity gain by multiple paths.

In order to achieve the above objects, an apparatus according to the present invention comprises a plurality of Pien despreading blocks for pien despreading a cue channel and an eye channel signal input through a plurality of paths, and by the plurality of Pien despreading blocks. A first combiner for combining the pien despread cue channel signal, a second combiner for combining the signals of the i-channel de-spread by the plurality of pien despread blocks, the first combiner and the second combiner And a plurality of Walsh demodulation blocks for separating the signals output through the plurality of channels, and a plurality of third combiners for combining and outputting signals of the cue channel and the eye channel output from the plurality of Walsh demodulation blocks. It features.

1 is a block diagram for compensating and collecting delays of a Q channel and an I channel coming into a multipath of a receiver using a conventional code division multiple access scheme.

2 is a Walsh demodulation block diagram for separating channels of a receiver using a conventional code division multiple access scheme.

3 is a block diagram for merging data transmitted by multiple carriers using a conventional code division multiple access scheme.

4 is a block diagram for despreading according to a conventional code division multiple access scheme.

5 is a block diagram of a transmitter according to a multicarrier using a conventional code division multiple access scheme.

6 is a block diagram of a transmitter using a code division multiple access scheme according to the present invention;

7 is a flowchart illustrating operation of a finger unit of a transmitter using a code division multiple access method according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings. In addition, specific details appear in the following description, which is provided to help a more general understanding of the present invention, and the present invention may be practiced without these specific matters. Will be self-evident. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

6 is a block diagram of a transmitter using a code division multiple access scheme according to the present invention.

7 is a flowchart illustrating operation of a finger unit of a transmitter using a code division multiple access method according to an embodiment of the present invention.

In the code division multiple access method using a single carrier according to the present invention, a plurality of PIE despread blocks 600, 601, and 602 for PN despreading a cue channel and an eye channel signal input through a plurality of paths, and Combining a first combiner 610 for combining the CQ channel signals de-spread by the PPI despread blocks and the signals of the I-channels de-spread by the PPI despread blocks 600, 601, 602 A plurality of Walsh demodulation blocks 630, 631, and 632 for separating the signals output through the first coupler 610 and the second coupler 620 into a plurality of channels, and the plurality of Walsh demodulation blocks 630; A plurality of third combiners 640, 641, and 642 for combining the cue channel and the eye channel signals output from 631 and 632 and outputting the signals for each channel.

In the case of using a multi-carrier, the above-described structure is provided for each carrier, and a plurality of combiners are provided for collecting signals output for each channel for each carrier through the third combiner. That is, a plurality of Pien despread blocks for despreading the CUE and I-channel signals input through a plurality of paths for each carrier and a plurality of Pien despread blocks for each of the carriers A first combiner for combining the received cue channel signals, a second combiner for combining the signals of the i-channels de-spread by the plurality of PIene despreading blocks for each of the carriers, and for the respective carriers Combining the plurality of Walsh demodulation blocks for separating the signals output through the first combiner and the second combiner into a plurality of channels, and the cue channel and the eye channel signals output from the plurality of Walsh demodulation blocks for each carrier; And a third combiner for outputting the signal, and a signal output through the third combiner for each carrier to each channel. One fourth coupler.

An embodiment according to the present invention will be described with reference to FIGS. 6 and 7 as follows.

In FIG. 6, signals 1, 2, and 3 input through the multipaths are despread using the PN code generated by the PN generator in step 700. The PN despread cue channel signal is combined and output through the first combiner 610 in step 710. Likewise, in step 710, the PN despreaded eye channel signal is combined and output through the second combiner 620. The signal output through the combiner 610, 620 is Walsh demodulated by the Walsh demodulation block consisting of Walsh 1 630, Walsh 2 631, Walsh 3 632 in step 720. The Walsh demodulated signal is combined and outputted through MUX 640, 641, 642 for each channel again in step 730. In FIG. 6, it is easily understood that the structure is simple and the block configuration is easy as compared with FIG. 5. As described above, when the Walsh demodulation blocks 630, 631, and 632 are positioned after the combiners 610 and 620, the Walsh demodulation blocks by the number of fingers are reduced, and the mux blocks are also reduced.

Applying the above structure to the IMT-2000 can be implemented as follows.

A block as shown in FIG. 6 is configured for each carrier. That is, three blocks as shown in FIG. In addition, a mux (fourth combiner) for combining the channel-specific signals output from each carrier by the same channel may be further configured by the number of channels. When used as described above, the channel used is a pilot channel, an access channel, an access channel, a fundamental channel, a dedicated control channel, and a supplemental channel. On the other hand, if it is configured as shown in FIG. 6 and used in a conventional PCS communication terminal, the channel configured and used as shown in FIG. 6 becomes a pilot channel, an access channel, and a basic channel. That is, the Walsh demodulation block may vary depending on the number of channels used.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention arranges signals obtained through the multipath in the order of PN despreading block, combiner, Walsh demodulation block, and mux, so that not only a mobile terminal using a conventional code division multiple access scheme but also a next generation A terminal transmission apparatus of a communication method according to a multi-carrier applicable to mobile communication IMT-2000 can be implemented with a simple structure.

Claims (6)

In a receiving apparatus using a code division multiple access method using a single carrier, A plurality of Pien despread blocks for pien despreading the cue channel and the eye channel signals input through the plurality of paths; A first combiner for combining the Q channel despread signal by the PPI despread block; A second combiner for combining the signals of the i-channels de-spread by the plurality of P-en despread blocks; A plurality of Walsh demodulation blocks for separating signals outputted through the first combiner and the second combiner into a plurality of channels; And a plurality of third combiners for combining and outputting cue channel and eye channel signals output from the plurality of Walsh demodulation blocks. The method of claim 1, Wherein the plurality of Walsh demodulation blocks for separating the signals output through the first combiner and the second combiner into a plurality of channels are three blocks for a pilot channel, an access channel, and a base channel. In a receiving apparatus using a code division multiple access method using a plurality of carriers, A plurality of Pien despread blocks for pien despreading the cue channel and the eye channel signals input through a plurality of paths for each carrier, A first combiner for combining the Q-channel de-spread cue signal by the plurality of P-EN despread blocks for each carrier; A second combiner for combining signals of i-channels de-spread by the plurality of P-en despreading blocks for each carrier; The plurality of Walsh demodulation blocks for separating signals output through the first combiner and the second combiner into a plurality of channels for each carrier; A third combiner for combining and outputting signals of a cue channel and an eye channel output from a plurality of Walsh demodulation blocks for each carrier; And a fourth combiner for combining the signals output through the third combiner by the same channel for each carrier. The method of claim 3, wherein The plurality of Walsh demodulation blocks for separating the signals output through the first combiner and the second combiner into a plurality of channels include a pilot channel, an access channel, a basic channel, a dedicated control channel, and five additional channels. Device characterized in that the four blocks. In the reception method of a code division multiple access wireless terminal using a single carrier, Despreading the signals of the cue channel and the eye channel input through a plurality of paths; Combining the PEN despread signal for each of the cue channel and the eye channel; Walsh demodulating the combined cue channel and eye channel signals through the plurality of Walsh demodulation blocks; And combining the signals of the cue channel and the eye channel output by the Walsh demodulation for each channel and outputting the combined signals. In the reception method of a code division multiple access wireless terminal using a plurality of carriers, Despreading the signals of the cue channel and the eye channel input through a plurality of paths for each carrier; Combining the PEN despread signal for each of the carriers for each of the cue channel and the eye channel; Walsh demodulating the combined cue channel and eye channel signals through the plurality of Walsh demodulation blocks for each carrier; Combining and outputting signals of a cue channel and an eye channel for each carrier by the Walsh demodulated channel and outputting the channels; And combining the signals combined for each channel for each carrier by the same channel.