Abstract
An improved pilot symbol-assisted channel estimation filter, called the weighted multi-slot averaging (WMSA) channel estimation filter, is presented for DS-CDMA transmission links using coherent RAKE combining. Known pilot symbols are periodically time-multiplexed with the sequence of transmitted data symbols; they are placed at the beginning of each data slot. The WMSA channel estimation filter extends the observation interval over several slots. The average bit error rate (BER) performance achievable with coherent RAKE combining using the proposed WMSA channel estimation filter is evaluated by computer simulations in a frequency selective multipath Rayleigh fading channel and the results are compared with those achievable with the use of other channel estimation filters such as an interpolation filter. The DS-CDMA reverse link requires fast transmit power control (TPC). In this paper, we also consider fast TPC based on the measurement of signal-to-interference plus background noise ratio (SIR). The average BER performance with the time-multiplexed pilot channel is also compared with that with the parallel pilot channel.
| Original language | English |
|---|---|
| Pages (from-to) | 1517-1525 |
| Number of pages | 9 |
| Journal | IEICE Transactions on Communications |
| Volume | E81-B |
| Issue number | 7 |
| Publication status | Published - 1998 |
| Externally published | Yes |
Keywords
- Channel estimation
- DS-CDMA
- Mobile radio
- RAKE combining
ASJC Scopus subject areas
- Software
- Computer Networks and Communications
- Electrical and Electronic Engineering