CN1260992C - Frequency selecting method for TD-SCDMA/GSM UE double-mode multi-band receiver-transmittor machine - Google Patents

Frequency selecting method for TD-SCDMA/GSM UE double-mode multi-band receiver-transmittor machine Download PDF

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CN1260992C
CN1260992C CN 03117916 CN03117916A CN1260992C CN 1260992 C CN1260992 C CN 1260992C CN 03117916 CN03117916 CN 03117916 CN 03117916 A CN03117916 A CN 03117916A CN 1260992 C CN1260992 C CN 1260992C
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frequency
band
scdma
gsm
receiver
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CN1549633A (en
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郑建宏
陆秋捷
彭火成
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Keen Chongqing Microelectronics Technology Co ltd
Chongqing University of Post and Telecommunications
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CHORGYOU XINKE Co Ltd CHONGQING
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Abstract

The present invention relates to a medium frequency selecting method of a TD-SCDMA/GSM UE double-mode multifrequency band receiver-transmittor machine. In the method of the present invention, medium frequency selecting ranges of receiving frequency bands of the TD-SCDMA/GSM UE double-mode multifrequency band receiver-transmittor machine are respectively calculated by programming according to the limiting conditions of the prevention of various signal harmonic waves in a receiver and the combination interference of the various signal harmonic waves; the receiving and transmitting medium frequency of the TD-SCDMAUE and the GSMUE are found out on the basis. The method has effects on preventing different possible combination interference of the receiver, enhancing the interference resistant capability of the receiver, optimally designing a frequency synthesizer circuit and reducing cost.

Description

The system of selection of TD-SCDMA/GSM UE bimodulus multiband transceiver intermediate frequency
One. technical field
The present invention relates to the system of selection of a kind of TD-SCDMA/GSM UE bimodulus multiband transceiver frequency synthesizer intermediate frequency, belong to the mobile communication system technical field, be specifically related to 3-G (Generation Three mobile communication system).
Two. background technology
In TD-SCDMA/GSM UE bimodulus multiband transceiver frequency synthesizer, owing to will realize that TD-SCDMAUE and GSM UE are compatible, finish second generation gsm communication net to the seamlessly transitting of third generation TD-SCDMA communication network, need the various interference considered more relatively.According to the regulation that Ministry of Information Industry's " letter portion does not have literary composition [2002] No. 479 " divides about third generation public mobile communication system frequency, distribute to the asymmetrical time division duplex of the TD-SCDMA third generation public mobile communication 155MHz of system (TDD) and can run frequency range.This 155MHz bandwidth is to be distributed in 1880-1920MHz, and 2010-2025MHz and 2300-2400MHz be totally three frequency ranges.And the reception of GSM UE and transmit frequency band are to be respectively 935-960MHz, 890-915MHz.Obviously, TD-SCDMA/GSM UE radio-frequency (RF) front-end circuit will realize that TD-SCDMA UE and GSM UE are compatible, promptly be to finish above-mentioned TD-SCDMA UE at 1880-1920MHz, in the time of 2010-2025MHz and 2300-2400MHz reception or emission, also should be able to finish GSM UE in the reception of 935-960MHz frequency range and the emission of 890-915MHz frequency range.For this reason, TD-SCDMA/GSM UE receives or sends required local oscillation signal must have corresponding radio frequency and IR-PLL and VCO thereof to support, and the distribution of the various combination interference Frequency points of the frequency coverage of its VCO and receiver all is to select different and different because of the intermediate frequency of transceiver.Be the interference of the harmonic wave of avoiding various signals in the TD-SCDMA/GSMUE and intermodulation signal thereof to receiver, and optimize the radio frequency of TD-SCDMA/GSM bimodulus multifrequency transceiver and the circuit design of IR-PLL and corresponding VCO thereof, TD-SCDMA/GSM UE bimodulus transceiver IF-FRE be selected to key.
Three. summary of the invention
The objective of the invention is according to the restrictive condition of avoiding interior various signal harmonics of receiver and combination interference thereof, the IF-FRE that respectively receives frequency range that calculates TD-SCDMA/GSM UE bimodulus multiband transceiver respectively can be chosen scope, and finds out reception and the emission medium-frequency frequency of TD-SCDMA UE and GSM UE on this basis.The restrictive condition of selective receiver intermediate frequency is:
1, disturb for the image frequency that suppresses received signal better, receiver should be selected high intermediate frequency f IF, its selected receiver intermediate frequency f IF-RXShould satisfy condition: 150MHz≤f IF-RX≤ 350MHz
2, selective reception intermediate frequency f IF-RXShould be greater than the received signal bandwidth B i3/2 times to satisfy the requirement of its no third order intermodulation, promptly f IF - RX > 3 2 B i . Wherein, B iBe the received RF signal bandwidth.
3, receiver intermediate frequency f IF-RXAny subharmonic n * f IF-RXShould not drop in the received RF band, to avoid fixedly interference receiver.Promptly n × f IF - RX ∉ f RF - RX - Band . Wherein, f RF-RX-BandBe the received RF frequency band; N is positive integer arbitrarily.
4, reference clock frequency f RAny subharmonic n * f RShould not drop in the radio frequency and midband of receiver, promptly n × f R ∉ f RF - RX - Band ; n × f R ∉ f IF - RX - Band . Wherein, f RF-RX-BandBe the received RF frequency band; f IF-RX-BandMedium-frequency band for receiver; N is positive integer arbitrarily.
5, same, DSP work clock speed f SAny subharmonic n * f SShould not drop in received RF and the midband, promptly n × f s ∉ f RF - RX - Band ; n × f s ∉ f IF - RX - Band . Wherein, f RF-RX-BandBe radio frequency frequency acceptance band, f IF-RX-BandFor receiving medium-frequency band; N is positive integer arbitrarily.
6, the sampling clock speed f of base band ADC BAny subharmonic n * f BShould not drop in received RF and the midband, promptly n × f B ∉ f RF - RX - Band ; n × f B ∉ f IF - RX - Band . Wherein, f RF-RX-BandBe the radio frequency frequency acceptance band; f IF-RX-BandBe positive integer arbitrarily for receiving medium-frequency band: n.
Receive the restrictive condition that intermediate frequency is selected according to above-mentioned TD-SCDMA/GSM UE, determine that the method and the step of TD-SCDMA UE and GSM UE receiver IF-FRE is as follows:
1). when TD-SCDMA UE receiver when the 1880-1920MHz frequency range is worked, if receiver adopts the heterodyne scheme, then the frequency range of radio frequency VCO should be [(1880-1920)+f IF-TSM-A] MHz.Receive restrictive condition (1)-(6) that intermediate frequency is selected according to above-mentioned TD-SCDMA/GSMUE, calculate by programming and receive intermediate frequency f this moment IF-TSM-AThe scope chosen.
2). when TD-SCDMA UE receiver when the 2010-2025MHz frequency range is worked, if receiver adopts the heterodyne scheme, then the frequency range of radio frequency VCO should be [(2010-2025)+f IF-TSM-B] MHz.Receive restrictive condition (1)-(6) that intermediate frequency is selected according to above-mentioned TD-SCDMA/GSMUE, calculate by programming and receive intermediate frequency f this moment IF-TSM-BThe scope chosen.
3). when TD-SCDMA UE receiver when the 2300-2400MHz frequency range is worked, if receiver adopts the interpolation scheme, then the frequency range of radio frequency VCO should be [(2300-2400)-f IF-TSM-C] MHz.Receive restrictive condition (1)-(6) that intermediate frequency is selected according to above-mentioned TD-SCDMA/GSMUE, calculate by programming and receive intermediate frequency f this moment IF-TSM-CThe scope chosen.
4). from the above-mentioned the 1st), 2), 3) f that step calculated IF-TSM-A, f IF-TSM-B, f IF-TSM-CIn, obtain their common IF-FRE point f IF-TSM-RXThis is the scope chosen of TD-SCDMA UE receiver intermediate frequency just.
5). because of the reception of TD-SCDMA UE identical with tranmitting frequency, so should choose the emission medium-frequency f of TD-SCDMA UE IF-TSM_TXShould with the reception intermediate frequency f of TD-SCDMA UE IF-TSM-RXIdentical, i.e. f IF-TSM_TX=f IF-TSM-RX=f IF-TSMLike this as long as TD-SCDMA UE adopts the emission of frequency conversion lower sideband at 1880-1920MHz and the work of 2010-2025MH frequency range; 2300-2400MHz then adopts the emission of frequency conversion upper sideband.Calculate the frequency coverage f of the required radio frequency VCO of TD-SCDMA UE transmitter RF-TSM-VCO-TXFrequency range f with the required radio frequency VCO of TD-SCDMAUE receiver RF-TSM-VCO-RXBe duplicate.Be a TD-SCDMA UE transmitting-receiving shared radio-frequency (RF) local oscillator frequency fully, when the conversion of transmitting-receiving time slot, the frequency of radio-frequency (RF) local oscillator then need not changed like this.
6). when GSM UE receiver when the 935-960MHz frequency range is worked, if receiver adopt the heterodyne scheme and with the local oscillation signal of radio frequency VCO before participating in receiving down-conversion through removing 2 circuit frequency divisions, then the frequency range of radio-frequency (RF) local oscillator should be 2 * [(935-960)+f IF-GSM-RX] MHz.Receive restrictive condition (1)-(6) that intermediate frequency is selected according to above-mentioned TD-SCDMA/GSM UE, calculate, then can draw and receive intermediate frequency f this moment by programming IF-GSM-RXThe scope chosen.This just the intermediate frequency of GSM UE receiver can choose scope.
7). if choose the emission medium-frequency f of GSM UE IF-GSM_TXReception intermediate frequency f than GSM UE IF-GSM-RXHigh 45MHz, i.e. f IF-GSM_TX=(f IF-GSM-RX+ 45) MHz.If at this moment adopt the emission of frequency conversion lower sideband when launching, and the local oscillation signal of sending out of radio frequency VCO needed then be not difficult to calculate the frequency range f of the required radio frequency VCO of GSM UE transmitter through removing 2 circuit frequency divisions before the frequency conversion that participates in posting a letter RF-GSM-VCO-TX=2 * [(890-915)+f IF-GSM_TX] MHz=2 * [(935-960)+f IF-GSM-RX].The frequency range of the radio-frequency (RF) local oscillator that this and GSM UE receiver are required is identical.Then the radio-frequency (RF) local oscillator of GSM UE reception and emission has realized shared equally.
8) no matter. be TD-SCDMA UE or GSM UE, because of when carrying out quadrature modulation or quadrature demodulation, its required intermediate frequency local oscillator signal all needs through removing 2 circuit frequency divisions, so be f if select the transmitting-receiving intermediate frequency of TD-SCDMA UE IF-TSMThe transmitting-receiving intermediate frequency of GSM UE is f IF-GSMThen the coverage of the required intermediate frequency local oscillator frequency of TD-SCDMA/GSM UE then is f IF-VCO=2 * (f IF-TSM_ f IF-GSM)
9). if choose the reception intermediate frequency f of TD-SCDMA IF-TSM-RxBe 186MHz, then can calculate to satisfying TD-SCDMA UE simultaneously at 1980-1920MHz; 2010-2025MHz; The needs that 2300-2400MHz receives and launches, the frequency range of its radio frequency VCO should be 2066-2214MHz.
10). if choose the reception intermediate frequency of GSM is 163MHz, then can calculate to satisfying the needs of GSM in 890-915MHz band transmit and the reception of 935-960MHz frequency range simultaneously, and the frequency range of its radio frequency VCO should be 2196-2246MHz.
The present invention is that the IF-FRE that respectively receives frequency range that calculates TD-SCDMA/GSM UE bimodulus multiband transceiver by programming respectively can be chosen scope according to the restrictive condition of avoiding interior various signal harmonics of receiver and combination interference thereof.And find out the reception of such TD-SCDMA UE and GSM UE on this basis and send out IF-FRE, can reduce the radio frequency VCO of TD-SCDMA/GSM UE bimodulus radio-frequency front-end and the coverage of intermediate frequency VCO, finally realize the purpose of shared radio frequency VCO of TD-SCDMA/GSM UE bimodulus multiband transceiver and intermediate frequency VCO.This method is for avoiding the various possible combination interference of receiver, improve the receiver antijamming capability and to the optimal design of frequency synthesizer circuit, to reduce its cost all be a kind of highly effective method.
The present invention is described further below in conjunction with accompanying drawing.
Four. description of drawings
Fig. 1 is that TD-SCDMA/GSM UE RX intermediate frequency is selected calculation process;
Fig. 2 is TD-SCDMA UE RX f IF-TSM-ACalculation process;
Fig. 3 is TD-SCDMA UE RX f IF-TSM-BCalculation process;
Fig. 4 is TD-SCDMA UE RX f IF-TSM-CCalculation process;
Fig. 5 is GSM UE RX f IF-GSM-RXCalculation process.
Five. embodiment
Determining of intermediate frequency selectional restriction condition
When TD-SCDMA/GSM UE bimodulus multiband transceiver is worked, in machine, must exist corresponding reference clock f simultaneously R, DSP work clock f S, ADC sample frequency f B, intermediate frequency local oscillator f IL, radio-frequency (RF) local oscillator f RLIntermediate-freuqncy signal f with receiver IFAnd their pairing various harmonic signals.So, when selecting the receiver intermediate frequency of TD-SCDMA UE and GSMUE, at first must avoid the harmonic wave and the combination interference signal thereof of various signals in the receiver to drop on the intrinsic interference that makes it in received RF signal or the receiving intermediate frequency signal band to become to receiver.Simultaneously, because of receive and the radio-frequency (RF) local oscillator frequency range of emission directly related with the intermediate frequency of selected reception and emission, so, when the intermediate frequency of the Receiver And Transmitter of selecting TD-SCDMA UE and GSM UE, also should reduce the coverage of radio frequency VCO and intermediate frequency VCO as possible, thereby reduce the quantity of radio frequency VCO and intermediate frequency VCO, optimize the purpose of the design of its required frequency synthesizer circuit with realization.For this reason, at first provide the restrictive condition of following selective receiver intermediate frequency.
1. suppress the image frequency interference receiver of received signal better and should select high intermediate frequency f IF, its selected receiver intermediate frequency f IF-RXShould satisfy condition: 150MHz≤f IF-RX≤ 350MHz
2. intermediate frequency f IF-RXShould be greater than the received signal bandwidth B i3/2 times to satisfy the requirement of its no third order intermodulation, promptly f IF - RX > 3 2 B i . Wherein, B iBe the received RF signal bandwidth.
3. receive machine intermediate frequency f IF-RXAny subharmonic n * f IF-RXShould not drop in the received RF band, to avoid fixedly interference receiver.Promptly n × f IF - RX ∉ f RF - RX - Band . Wherein, f RF-RX-BandBe the received RF frequency band; N is positive integer arbitrarily.
4. reference clock frequency f RAny subharmonic n * f RShould not drop in the radio frequency and midband of receiver, promptly n × f R ∉ f RF - RX - Band ; n × f R ∉ f IF - RX - Band . Wherein, f RF-RX-BandBe the received RF frequency band; f IF-RX-BandMedium-frequency band for receiver; N is positive integer arbitrarily.
5. same, DSP work clock speed f SAny subharmonic n * f SShould not drop in received RF and the midband, promptly n × f s ∉ f RF - RX - Band ; n × f s ∉ f IF - RX - Band . Wherein, f RF-RX-BandBe the radio frequency frequency acceptance band; f IF-RX-BandFor receiving medium-frequency band; N is positive integer arbitrarily.
6. the sampling clock speed f of base band ADC BAny subharmonic n * f BShould not drop in received RF and the midband, promptly n × f B ∉ f RF - RX - Band ; n × f B ∉ f IF - RX - Band . Wherein, f RF-RX-BandBe the radio frequency frequency acceptance band; f IF-RX-BandFor receiving medium-frequency band; N is positive integer arbitrarily.
Intermediate frequency is selected the calculation process explanation
Receive the restrictive condition that intermediate frequency is selected according to above-mentioned TD-SCDMA/GSM UE, calculate the scope chosen of the IF-FRE that then can obtain TD-SCDMA UE and each frequency range of GSM UE receiver respectively by programming.The main flow chart that its programming is calculated as shown in Figure 1.
Programming is calculated and be its objective is in (150-350) MHz scope, and when stepping is 1MHz, but judgement TD-SCDMA/GSMUE receives the selected value of intermediate frequency.Referring to Fig. 1.In the flow chart listed judgment condition from [ f IF - RX < 3 2 B i ] To [n * f B∈ f IF-RX-Band] all opposite with the given intermediate frequency alternative condition of above-mentioned the 4th 2--6 money.So in the programming calculation process, when judgement was " Y ", this was to have run counter to actual required intermediate frequency alternative condition, thereby determine that this intermediate frequency value is inadvisable, flow process will directly enter [f IF_RX=f IF_RX+ 1] program cycle; And when judgement is for " N " in the programming calculation process, then be to have met actual required intermediate frequency to select judgment condition, flow process will enter down step intermediate frequency alternative condition judgement.Adjudicated roughly the same with the last step, and if in second step programming calculation process, adjudicate when being " Y ", then be to have run counter to actual required intermediate frequency to select judgment condition, thereby determine that this intermediate frequency value is inadvisable that flow process will directly enter [f IF_RX=f IF_RX+ 1] program cycle; And when judgement is for " N " in the programming calculation process, then be to have met actual required intermediate frequency to select judgment condition, thereby determine to carry out next step judgement; Go round and begin again, until finishing [n * f S∈ f IF_RX_Band] judgment condition, could determine finally that as still adjudicating this intermediate frequency value is desirable and export this value to " N ".Then, flow process just can enter [f IF_RX=f IF_RX+ 1] program cycle.Has only the f of working as IF_RX+ 1=350; [f IF_RXWhen＜350] the flow process judgement is for " N ", just can finish of the selection judgement of current intermediate frequency from 150-350MHz.
On the basis of Fig. 1 flow chart, if according to TD-SCDMAUE at 1880-1920MHz, 2010-2025MHz, 2400-2500MHz frequency range and GSM UE can calculate the optional value of intermediate frequency in the specific requirement that 935-960MHz frequency range receiver intermediate frequency is selected.
When TD-SCDMA UE receiver when the 1880-1920MHz frequency range is worked, if receiver adopts the heterodyne scheme, then the frequency range of radio frequency VCO should be [(1880-1920)+f IF-TSM-A] MHz, promptly heterodyne is that the frequency of radio frequency VCO equals radio frequency receive frequency and IF-FRE sum.Receive restrictive condition (1)-(6) that intermediate frequency is selected according to above-mentioned TD-SCDMA/GSM UE, calculate by programming and receive intermediate frequency f this moment IF-TSM-AThe scope chosen, its concrete calculation flow chart is asked for an interview Fig. 2, its result of calculation is asked for an interview table 1.
Table 1 unit: MHz
150 151 152 153 154 155 161 162 163 165
166 167 168 170 175 176 177 178 179 180
181 183 184 185 186 187 193 194 196 197
198 199 200 201 202 203 204 205 206 207
214 215 216 217 218 219 220 222 223 224
225 226 227 228 229 230 231 232 233 241
242 243 244 248 249 250 251 252 253 254
255 256 257 258 259 261 262 263 264 265
266 267 268 275 276 277 278 279 280 281
282 283 284 285 286 287 288 289 290 291
292 293 294 295 296 297 298 299 300 301
302 303 304 305 306 307 308 309 310 311
312 313 321 322 323 324 325 326 329 330
331 332 333 334 335 336 337 338 339 340
341 342 343 344 345 346 347 348 349 350
When TD-SCDMA UE receiver when the 2010-2025MHz frequency range is worked, if receiver adopts the heterodyne scheme, then the frequency range of radio frequency VCO should be [(2010-2025)+f IF-TSM-B] MHz.Receive restrictive condition (1)-(6) that intermediate frequency is selected according to above-mentioned TD-SCDMA/GSM UE, calculate by programming and receive intermediate frequency f this moment IF-TSM-BThe scope chosen, its concrete calculation flow chart is asked for an interview Fig. 3, its result of calculation is asked for an interview table 2.
Table 2 unit: MHz
150 151 152 153 154 157 158 159 160 161
162 163 165 166 167 170 171 172 173 174
175 176 177 178 179 180 181 185 186 187
188 189 190 191 192 193 194 196 197 198
199 200 203 204 205 206 207 209 210 211
212 213 214 215 216 217 218 219 220 222
223 226 227 228 229 230 231 232 233 235
236 237 238 239 240 241 242 243 244 248
249 250 251 254 255 256 257 258 259 261
262 263 264 265 266 267 268 269 270 271
272 273 274 275 276 277 278 279 280 281
282 283 284 285 286 287 290 291 292 293
294 295 296 297 298 299 300 301 302 303
304 305 306 307 308 309 310 311 312 313
314 315 316 317 318 319 320 321 322 323
324 325 326 329 330 331 332 333 334 338
339 340 341 342 343 344 345 346 347 348
349 350
When TD-SCDMA UE receiver when the 2300-2400MHz frequency range is worked, if receiver adopts the interpolation scheme, then the frequency range of radio frequency VCO should be [(2300-2400)-f IF-TSM-C] MHz, promptly interpolation is that the frequency of radio frequency VCO equals the poor of radio frequency receive frequency and IF-FRE.Receive restrictive condition (1)-(6) that intermediate frequency is selected according to above-mentioned TD-SCDMA/GSM UE, calculate by programming and receive intermediate frequency f this moment IF-TSM-CThe scope chosen, its concrete calculation flow chart is asked for an interview Fig. 4, its result of calculation is asked for an interview table 3.
Table 3 unit: MHz
151 152 153 161 162 163 172 173 174 175
176 185 186 187 188 189 190 191 201 202
203 204 205 206 207 209 219 220 222 223
224 225 226 227 228 229 241 242 243 244
248 249 250 251 252 253 254 255 267 268
269 270 271 272 273 274 275 276 277 278
279 280 281 282 283 284 285 286 287 301
302 303 304 305 306 307 308 309 310 311
312 313 314 315 316 317 318 319 320 321
322 323 324 325 326 343 344 345 346 347
348 349 350
4. the f that is calculated from above-mentioned the 1st, 2,3 steps IF-TSM-A, f IF-TSM-B, f IF-TSM-CIn, can obtain their common IF-FRE point f IF-TSM-RXConcrete f IF-T-RxThe selectable frequency point range is asked for an interview table 4.
Table 4 unit: MHz
151 152 153 161 162 163 175 176 185 186
187 203 204 205 206 207 219 220 222 223
226 227 228 229 241 242 243 244 248 249
250 251 254 255 267 268 275 276 277 278
279 280 281 282 283 284 285 286 287 301
302 303 304 305 306 307 308 309 310 311
312 313 321 322 323 324 325 326 343 344
345 346 347 348 349 350
5. identical with tranmitting frequency because of the reception of TD-SCDMA UE, so should choose the emission medium-frequency f of TD-SCDMA UE IF-TSM_TXShould with the reception intermediate frequency f of TD-SCDMA UE IF-TSM-RXIdentical, i.e. f IF-TSM_TX=f IF-TSM-RX=f IF-TSMLike this as long as TD-SCDMA UE adopts the emission of frequency conversion lower sideband at 1880-1920MHz and the work of 2010-2025MH frequency range; 2300-2400MHz then adopts the emission of frequency conversion upper sideband.Be not difficult to calculate the frequency coverage f of the required radio frequency VCO of TD-SCDMA UE transmitter RF-TSM-VCO-TXFrequency range f with the required radio frequency VCO of TD-SCDMA UE receiver RF-TSM-VCO-RXBe duplicate.Be a TD-SCDMA UE transmitting-receiving shared radio-frequency (RF) local oscillator frequency fully, when the conversion of transmitting-receiving time slot, the frequency of radio-frequency (RF) local oscillator then need not changed like this.This is very favorable to keeping stable reception and emission.
When GSM UE receiver when the 935-960MHz frequency range is worked, if receiver adopt the heterodyne scheme and with the local oscillation signal of radio frequency VCO before participating in receiving down-conversion through removing 2 circuit frequency divisions, then the frequency range of radio-frequency (RF) local oscillator should be 2 * [(935-960)+f IF-GSM-RX] MHz.Receive restrictive condition (1)-(6) that intermediate frequency is selected according to above-mentioned TD-SCDMA/GSM UE, calculate by programming and receive intermediate frequency f this moment IF-GSM-RXThe scope chosen, its concrete calculation flow chart is asked for an interview Fig. 5, its result of calculation is asked for an interview table 5.
Table 5 unit: MHz
151 152 153 154 155 161 162 164 165 166
167 168 170 171 172 173 174 175 177 178
179 180 181 183 184 185 186 193 194 196
197 198 199 200 201 203 204 205 206 207
209 210 211 212 213 214 216 217 218 219
220 222 223 224 225 226 227 228 229 230
231 232 233 241 242 243 244 245 246 248
249 250 251 252 253 254 255 256 257 258
259 261 262 263 264 265 266 267 268 269
270 271 272 273 274 275 276 277 278 279
280 281 282 283 284 285 286 287 288 289
290 291 292 293 294 295 296 297 298 299
300 301 302 303 304 305 306 307 305 309
310 311 321 322 323 324 325 326 327 328
329 330 331 332 333 334 335 336 337 338
339 340 341 342 343 344 345 346 347 348
349 350
7. if choose the emission medium-frequency f of GSM UE IF-GSM_TXReception intermediate frequency f than GSM UE IF-GSM-RXHigh 45MHz, i.e. f IF-GSM_TX=(f IF-GSM-RX+ 45) MHz.If at this moment adopt the emission of frequency conversion lower sideband when launching, and the local oscillation signal of sending out of radio frequency VCO needed then be not difficult to calculate the frequency range f of the required radio frequency VCO of GSM UE transmitter through removing 2 circuit frequency divisions before the frequency conversion that participates in posting a letter RF-GSM-VCO-TX=2 * [(890-915)+f IF-GSM_TX] MHz=2 * [(935-960)+f IF-GSM-RX].The frequency range of the radio-frequency (RF) local oscillator that this and GSM UE receiver are required is identical.Then the radio-frequency (RF) local oscillator of GSM UE reception and emission has realized shared equally.
8. no matter be TD-SCDMA UE or GSM is UE, because of when carrying out quadrature modulation or quadrature demodulation, its required intermediate frequency local oscillator signal all needs through removing 2 circuit frequency divisions, so be f if select the transmitting-receiving intermediate frequency of TD-SCDMA UE IF-TSMThe transmitting-receiving intermediate frequency of GSMUE is f IF-GSMThen the coverage of the required intermediate frequency local oscillator frequency of TD-SCDMA/GSM UE then is f IF-VCO=2 * (f IF-TSM_ f IF-GSM)
9. if from table 4, choose the reception intermediate frequency f of TD-SCDMA IF-TSM-RxBe 186MHz, then be not difficult to calculate for satisfying TD-SCDMA UE simultaneously at 1880-1920MHz; 2010-2025MHz; The needs that 2300-2400MHz receives and launches, the frequency range of its radio frequency VCO should be 2066-2214MHz.
10. same, be 165MHz if in table 5, choose the reception intermediate frequency of GSM, then to be not difficult to calculate for satisfying the needs of GSM simultaneously in 890-915MHz band transmit and the reception of 935-960MHz frequency range, the frequency range of its radio frequency VCO should be 2110-2250MHz.
11. be not difficult to find out that from the 9th, the 10th result of calculation for satisfying TD-SCDMA/GSM UE transmitting-receiving requirements of one's work simultaneously, the frequency of its radio frequency VCO covers and should be 2066-2250MHz.Clearly 2066-2250MHz has only the coverage of 184MHz, and this illustrates that just TD-SCDMA/GSM UE fully can a shared radio frequency VCO.
12. it is same, learn that from the 9th, the 10th TD-SCDMA and GSM receive intermediate frequency and be respectively 186MHz and 165MHz, the frequency of then being not difficult to obtain the shared intermediate frequency VCO of TD-SCDMA/GSM covers and should be 330-372MHz, and this illustrates that just TD-SCDMA/GSM UE equally can a shared intermediate frequency VCO.
Above-mentioned method has been applied among the experimental prototype of TD-SCDMA/GSM UE, facts have proved effective.

Claims (9)

1. the IF-FRE system of selection of a TD-SCDMA/GSM UE bimodulus multiband transceiver is characterized in that the restrictive condition of selective receiver intermediate frequency is:
(1). receiver is selected high intermediate frequency f IF, its selected receiver intermediate frequency f IF-RXShould satisfy condition: 150MHz≤f IF-RX≤ 350MHz;
(2). selective reception intermediate frequency f IF-RXShould be greater than the received signal bandwidth B i3/2 times to satisfy the requirement of its no third order intermodulation, promptly f IF - RX > 3 2 B i , Wherein, B iBe the received RF signal bandwidth;
(3). receiver intermediate frequency f IF-RXAny subharmonic n * f IF-RXShould not drop in the received RF band, to avoid fixedly interference, promptly receiver n &times; f IF - RX &NotElement; f RF - RX - Band ; Wherein, f RF-RX-BandBe the received RF frequency band; N is positive integer arbitrarily;
(4). reference clock frequency f RAny subharmonic n * f RShould not drop in the radio frequency and midband of receiver, promptly n &times; f R &NotElement; f RF - RX - Band ; n &times; f R &NotElement; f IF - RX - Band ; Wherein, f RF-RX-BandBe the received RF frequency band; f IF-RX-BandMedium-frequency band for receiver; N is positive integer arbitrarily;
(5) .DSP work clock speed f SAny subharmonic n * f SShould not drop in received RF and the midband, promptly n &times; f S &NotElement; f RF - RX - Band ; n &times; f S &NotElement; f IF - RX - Bana ; Wherein, f RF-RX-BandBe the radio frequency frequency acceptance band; f IF-RX-BandFor receiving medium-frequency band; N is positive integer arbitrarily;
(6). the sampling clock speed f of base band ADC RAny subharmonic n * f BShould not drop in received RF and the midband, promptly n &times; f B &NotElement; f RF - RX - Band ; n &times; f B &NotElement; f IF - RX - Band ; Wherein, f RF-RX-BandBe the radio frequency frequency acceptance band; f IF-RX-BandFor receiving medium-frequency band; N is positive integer arbitrarily.
2. the method for claim 1, it is characterized in that when TD-SCDMA UE receiver when the 1880-1920MHz frequency range is worked, if receiver adopts the heterodyne scheme, then the frequency range of radio frequency VCO should be [(1880-1920)+f IF-TSM-A] MHz, receive restrictive condition (1)-(6) that intermediate frequency is selected according to TD-SCDMA/GSM UE, calculate by programming and receive intermediate frequency f this moment IF-TSM-AThe scope chosen.
3. the method for claim 1, it is characterized in that when TD-SCDMA UE receiver when the 2010-2025MHz frequency range is worked, if receiver adopts the heterodyne scheme, then the frequency range of radio frequency VCO should be [(2010-2025)+f IF-TSM-B] MHz, receive restrictive condition (1)-(6) that intermediate frequency is selected according to TD-SCDMA/GSM UE, calculate by programming and receive intermediate frequency f this moment IF-TSM-BThe scope chosen.
4. the method for claim 1 is characterized in that being operated in tdd mode as TD-SCDMA/GSM UE, and when the 2300-2400MHz frequency range received, receiver adopted the interpolation scheme, obtains the reception intermediate frequency f that meets in this frequency range work IF-TSM-C
5. the method for claim 1 is characterized in that being operated in tdd mode as TD-SCDMA/GSM UE, at 1920-1980MHz, and 2010-2025MHz, any frequency range reception of 2300-2400MHz work, TD-SCDMA UE intermediate frequency f IF-TSMSelection should be at f IF-TSM-A, f IF-TSM-BAnd f IF-TSM-CIn the common coverage.
6. the method for claim 1, it is characterized in that being operated in tdd mode as TD-SCDMA/GSM UE, at 1920-1980MHz, 2010-2025MHz, the any frequency range reception of 2300-2400MHz work, meet the described receiver intermediate frequency of claim 1 selectional restriction condition simultaneously ,-final TD-SCDMA UE intermediate frequency f IF-TSMSelection should be at f IF-TSM-A, f IF-TSM-BAnd f IF-TSM-CIn the common coverage.
7. the method for claim 1 is characterized in that being operated in fdd mode as TD-SCDMA/GSM UE, and when the 935-960MHz frequency range received, receiver adopted the heterodyne scheme, obtains the reception intermediate frequency f that meets in this frequency range work IF-GSM, this is the range of choice of GSM UE intermediate frequency just.
8. the method for claim 1 is characterized in that being operated in tdd mode as TD-SCDMA/GSM UE, at 1920-1980MHz, and 2010-2025MHz, when any band transmit of 2300-2400MHz was worked, emission medium-frequency was identical with the reception intermediate frequency.
9. the method for claim 1 is characterized in that being operated in fdd mode as TD-SCDMA/GSM UE, and when the 890-915MHz band transmit was worked, emission medium-frequency received the high 45MHz of intermediate frequency.
CN 03117916 2003-05-21 2003-05-21 Frequency selecting method for TD-SCDMA/GSM UE double-mode multi-band receiver-transmittor machine Expired - Lifetime CN1260992C (en)

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