Base station transceiver in CDMA mobile communication system

Abstract

The base station transceiver in a CDMA mobile communication system is configured to have a separate hardware component for performing only a Viterbi decoding apart from a single hardware H / W that performs a composite function of modulation / demodulation and Viterbi encoding / decoding. The modulator and the Viterbi encoder are provided in one hardware by sectors; more than one demodulator being provided by sectors for demodulating signals from multiple users. And, more than one Viterbi decoder is separately provided for performing a Viterbi decoding of the signals demodulated at the plural demodulator constituted in each sector, thereby facilitating a decoding of demodulated signals received from multiple users and enhancing efficiency of the hardware.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a base station transceiver in a CDMA (Code Division Multiple Access) mobile communication system and, more particularly, to a base station transceiver in a CDMA mobile communication system configured to have a separate hardware component for performing only a Viterbi decoding apart from a single hardware H / W that performs a composite function of modulation / demodulation and Viterbi encoding / decoding, thereby facilitating a decoding of demodulated signals received from multiple users.[0003]2. Description of the Related Art[0004]A base station transceiver (hereinafter, referred to as “BTS”) in a CDMA digital mobile communication system communicates data and voice signals with mobile stations in a wireless way, controls mobile stations (e.g., PCS phones, DCS phones) to monitor speech quality, and connects a base station controller to the mobile stations linked to each other with wires. That ...

AI Technical Summary

Benefits of technology

[0017]It is, therefore, an object of the present invention to provide a base station transceiver in a CDMA mobile communication system configured to have a separate hardware component for performing only a Viterbi decoding apart from a single hardware H / W that performs a composite function of modulation / demodulation and Viterbi encoding / decoding, thereby facilitating a decoding of demodulated signals received from multiple users.

[0018]It is another object of the present invention to provide a base station transceiver in a CDMA mobile communication system configured to have a separate decoder hardware for performing only a Viterbi decoding apart from a single hardware H / W that performs both modulation / demodulation and Viterbi encoding / decoding functions, wherein a multi-user modulator board assembly combines channels from multiple users into digital signals to acquire accurate synchronization even at a high chip rate and Viterbi decoders are controlled in the form of a decoder pool, thus enhancing use efficiency of the decoder depending on the performance of the decoder element.

Problems solved by technology

That is, the conventional base station transceiver involves some problems in that there must be provided a plurality of hardware circuit packs including the Viterbi decoders and that, when required, the users and sectors, i.e., α, β and γ sectors must be increased in the units of channel element.

That is, there is required to substitute the Viterbi decoder with a turbo decoder in order to support a data service of higher than 144 Kbps with a modulator, demodulator and a Viterbi decoder in one hardware circuit pack, which incurs a serious problem involving an entire modification of the hardware circuit pack.

Also, signals from multiple users are combined in the analog form and thus accurate synchronization is hard to acquire in the case of modulating the composite analog signals at a high chip rate such as in the IMT-2000 system.

Furthermore, it is difficult to utilize the hardware efficiently because both the forward and reverse channels are allocated irrespective of the characteristics of the traffic channel.

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