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Flexible CDMA coombiner

A combiner and register technology, applied in the combiner field

Inactive Publication Date: 2002-02-06
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The combiner 3-1 in Fig. 2-1 has the disadvantage that the channels are combined unchanged on the sector carrier. Furthermore, the combiner 3-1 requires a rather scalable hardware, since the individual circuits need to be provided m times
Although the circuit in Fig. 2-3 is more flexible than that in Fig. 2-2 since the combiner 3-3 allows combining any input user channel on any desired sector carrier, an extension is required to implement the circuit hardware

Method used

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  • Flexible CDMA coombiner
  • Flexible CDMA coombiner
  • Flexible CDMA coombiner

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0051] The combiner CMB shown in Figure 4, from a predetermined number of n channels (such as user channels,  1 ,  2 ,... n ) are combined onto a predetermined number of m outputs, for example sector carriers sc-1, sc-2, . . . , sc-m of a digital radio communication system. These channels may also be pre-added channels. For example, in one practical configuration, each of the n=24 input channels to the combiner could consist of 32 pre-added channels, i.e. 1 =ch1+ch2+...ch32;  2 =ch33+ch34+...ch64 and so on, where "ch" denotes a specific user channel.

[0052] The digital data samples have a predetermined bit width in bits and arrive at the combiner in parallel, since the data sets each consist of n data samples at a predetermined common data sampling rate CLK. That is, at each time fixed point ″t k At "place, n data samples belong to n channels and arrive. Here k sub-processing units are provided, wherein sub-processing unit SUk is shown in Fig. 4. An input device IM...

no. 2 example

[0078] In addition to using the combiner according to the invention in a CDMA transmitter as explained with reference to FIGS. See, eg, K.D. Kammeyer: "Nachrichtenübertragung (Information Transmission)", B.G. Teubner, 2nd edition, 1996, pp. 658-672).

[0079] Figure 6 shows a functional block diagram of a rake receiver. Basically, it consists of a number L of so-called Rake branches RF 1 ,RF 2 ,...,R F L, a combiner RADD and a receiving unit REC. In each rake branch, the received complex baseband signal RC sampled at the chip rate is processed in the first multiplier m 1 , m 2 … m L and an appropriately delayed channel-specific pseudonoise sequence PN(d 1 ), PN(d 2 ),…PN(d L ) are multiplied, in the adder SUM 1 , SUM 2 , SUM L Added on top of the period of the PN sequence, and in the second multiplier m 1 ', m 2 ’… m L ’ and an estimated channel coefficient , , Multiply, where the asterisk signifies a complex combination. Different delay d in each rake br...

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Abstract

A combiner (CMB) comprises a number (K) of subprocessing units (S1, S2, Sk) which each combine digital data values from input data sets with a higher processing rate. A single selector (M3) is used for cyclically reading out the addition results from the respective subprocessing units (SU1, ..., SUk). The invention allows to flexibly combine data from any desired input onto a specific output.

Description

field of invention [0001] The present invention relates to a combiner for combining digital data samples from a predetermined number of inputs into a predetermined number of outputs, for example from a predetermined number of channels, to a predetermined number of carriers of a digital communication system. [0002] In telecommunication systems, a large number of channels, eg user channels containing voice or data signals, can be transmitted together over the same transmission medium (eg over the same radio frequency band). A number of access schemes are known for placing the data of a user channel on a transmission medium. For example one class of transmission schemes simultaneously transmits a number of different user channels in one radio frequency band in such a way that they overlap both in the time domain and in the frequency domain. One well known access scheme of this type is the CDMA (Code Division Multiple Access) scheme. [0003] Although the invention is not limi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04W88/08
CPCH04W88/08H04B1/7115H04B1/712H04B1/7117
Inventor R·D·库克拉B·多特韦克
Owner TELEFON AB LM ERICSSON (PUBL)