Title :
Admission control and adaptive CDMA for integrated voice and data systems
Author :
Tang, Xiaoyi ; Goldsmith, Andrea
Author_Institution :
California Univ., Berkeley, CA, USA
Abstract :
We propose a new direct-sequence code division multiple access (DS-CDMA) strategy for combining voice and variable-rate data. Our admission control policy uses a reservation policy for voice calls and different variable-rate schemes for data to maximize throughput on the residual bandwidth unused by voice. The data schemes we consider include variable bit rate (VBR), multicode (MC), and variable constellation size (VCS). We determine the voice call blocking probability and the data throughput for each of the variable-rate schemes. We find that VBR outperforms MC and VCS in terms of data throughput. We also calculate the improvement to system performance obtained by exploiting voice activity detection
Keywords :
adaptive signal detection; code division multiple access; integrated voice/data communication; optimisation; probability; spread spectrum communication; telecommunication congestion control; telecommunication traffic; variable rate codes; DS-CDMA; MC communication; VBR; VCS communication; adaptive CDMA; admission control; data communication; direct-sequence code division multiple access; multicode communication; reservation policy; system performance; throughput maximization; variable bit rate; variable constellation size communication; voice activity detection; voice call blocking probability; voice data integration; wireless networks; Adaptive control; Admission control; Bandwidth; Bit error rate; Data systems; Delay effects; Interference; Multiaccess communication; Programmable control; Throughput;
Conference_Titel :
Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd
Conference_Location :
Rhodes
Print_ISBN :
0-7803-6728-6
DOI :
10.1109/VETECS.2001.944894
