Low-power-adaptive MC-CDMA receiver architecture

被引:4
|
作者
Hasan, Mohd. [1 ]
Arslan, Tughrul [1 ]
Thompson, John S. [1 ]
机构
[1] Univ Edinburgh, Sch Engn & Elect, Edinburgh, Midlothian, Scotland
关键词
MC-CDMA; FFT; architecture; VLSI design;
D O I
10.4218/etrij.07.0106.0101
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
This paper proposes a novel concept of adjusting the hardware size in a multi-carrier code division multiple access (MC-CDNIA) receiver in real time as per the channel parameters such as delay spread, signal-to-noise ratio, transmission rate, and Doppler frequency. The fast Fourier transform (FFT) or inverse FFT (IFFT) size in orthogonal frequency division multiplexing (OFDM)/MC-CDN11A transceivers varies from 1024 points to 16 points. Two low-power reconfigurable radix-4 256-point FFT processor architectures are proposed that can also be dynamically configured as 64-point and 16-point as per the channel parameters to prove the! concept. By tailoring the clock of the higher FFT stages for longer FFTs and switching to shorter FFTs from longer FFTs, significant power saving is achieved. In addition, two 256 sub-carrier MC-CDNIA receiver architectures are proposed which can also be configured for 64 sub-carriers in real time to prove the feasibility of the concept over the whole receiver.
引用
收藏
页码:79 / 88
页数:10
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