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The Research of WCDMA Key Technology Base on Multi-mode SDR

Author: HeBin
Tutor: GuanYunFeng
School: Shanghai Jiaotong University
Course: Communication and Information System
Keywords: SDR WCMDA configurable rake receiver
CLC: TN929.533
Type: Master's thesis
Year: 2010
Downloads: 80
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Abstract


? ? ? ? As modern wireless communication systems are in a period of great development, now the mobile communication develops quickly with the existence of many standard, such as GSM, WCDMA, CDMA2000, TD-SCDMA, WLAN, LTE etc. In the near future, there must be coexistence of multiple modes in the mobile access network, by using a variety of different coverage and capacity of air interface techniques. The birth of multi-mode base station is becoming a trend.In this paper, we begin with the physical layer of the WCDMA system, and find out the process of WCDMA downlink physical layer, including spreading, scrambling and rake receiver etc, then we design the WCDMA key technology which aims at multi-mode base station base on SDR (software defined radio) platform. From the point of software, we show an idea of the configurable rake receiver which has many kinds of channel estimation algorithms and the receiving ability of high sample rate, with that we choose different channel estimation algorithms or sample rate to adapt to different channels. That is the concept we set up that we can easily change the parameters of the SDR platform to adapt to different system requirements and different kinds of environments. We have finished a simulation about the technology of WCDMA downlink physical layer which verifies the system receiving performance base on SDR platform under different kinds of environment and do some test of the configurable channel estimation’s performance. Our research shows that as the configurable rake receiver can change the channel estimation flexibly, there is no difference for the premise of certain system performances but lower computational complexity.In this paper, the research of configurable channel estimation algorithms that we show up base on SDR platform can be used for the research of other wireless communication systems’channel estimation, also this paper provide a new direction about the result that high sample rate will reduce the system’s BER (bit error rate) to some extent which can be used to rise the performance of other systems base on SDR platform.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Mobile Communications > Cellular mobile communications systems (mobile phones, mobile phone handsets ) > Code Division Multiple Access (CDMA) mobile communication
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