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# IEE Proceedings - Communications

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Displaying Results 1 - 10 of 10
• ### Capacity of a cellular time division duplex CDMA system

Publication Year: 1994, Page(s):351 - 356
Cited by:  Papers (14)  |  Patents (3)
| | PDF (505 KB)

A time division duplex (TDD) technique is considered for a CDMA cellular system. Its use enables all the multipath combining (using a RAKE type receiver) to be located in the base site rather than in the mobile unit. This is possible due to the reciprocal uplink and downlink channels which are created by time division, and employ the same carrier frequency. Simulations show that at low Doppler fad... View full abstract»

• ### Fast sequential decoding algorithm based on dynamic searching strategy

Publication Year: 1994, Page(s):312 - 316
Cited by:  Papers (1)
| | PDF (376 KB)

The authors present a new sequential decoding algorithm based on dynamic searching strategy to improve decoding efficiency. The searching strategy is to exploit both sorting' and path recording' techniques. By means of sorting, it is possible to identify the correct path in a very fast way and then, by path recording, the bit sequence can be recovered without degrading decoding performance. The ... View full abstract»

• ### Trellis decoding technique for block RLL/ECC

Publication Year: 1994, Page(s):297 - 302
Cited by:  Papers (3)
| | PDF (344 KB)

A new simple encoding technique that allows the design of almost all known block runlength-limited error control codes is described. Attention is focused on the most widely used codes (Hamming, Reed-Muller, Golay) with RLL properties. The trellis design procedure for the proposed codes is introduced. It is shown that the trellises of the designed codes are similar to the trellises of the coset cod... View full abstract»

• ### Design of a high performance nonblocking copy network for multicast ATM switching

Publication Year: 1994, Page(s):317 - 324
Cited by:  Papers (4)
| | PDF (484 KB)

Multicast switches have found many applications in communication networks. A common design of multicast switches is a tandem of a copy network and a point-to-point routing network. The occurrence of overflow is an inherent problem in copy networks. The authors study overflow control mechanisms in copy networks and present a novel copy-network architecture, which is based on T.T. Lee's design (1988... View full abstract»

• ### Soft decision decoding of Reed-Solomon codes using trellis methods

Publication Year: 1994, Page(s):303 - 308
Cited by:  Papers (4)  |  Patents (2)
| | PDF (352 KB)

Soft decision decoding of Reed-Solomon codes has been implemented by using trellis decoding methods. Trellis decoding schemes make it possible to incorporate both hard and soft decision methods easily. To establish maximum likelihood performance, the Viterbi decoding algorithm has been used. To reduce the decoder complexity caused by full search Viterbi decoding, reduced search methods have been t... View full abstract»

• ### New hybrid MAC-layer protocol for real-time bus networks

Publication Year: 1994, Page(s):325 - 333
Cited by:  Papers (4)
| | PDF (620 KB)

A hybrid group implicit token-CSMA/CD (GIT-CSMA/CD) access protocol for use in real-time bus networks is introduced. Network control is distributed over all nodes, thus eliminating the need for central switching. Operating features of the hybrid protocol are described together with its computer simulated performance evaluation. The results showing the delay-throughput characteristics are compared ... View full abstract»

• ### Improvement of noncoherent orthogonal coding by time overlapping

Publication Year: 1994, Page(s):309 - 311
Cited by:  Papers (2)  |  Patents (1)
| | PDF (200 KB)

A simple way to increase the performance of noncoherent orthogonal coding is suggested. The idea is to overlap the transmitted symbols in time using an appropriate set of symbols. The best upper bound of the possible performance improvement in terms of Eb/N0 when transmitting over the AWGN channel is proven to be M/(M-1). An example of a set of orthogonal symbols which can be... View full abstract»

• ### Further results on receivers for the nonlinear channel including pre- and post-nonlinearity filtering

Publication Year: 1994, Page(s):334 - 340
Cited by:  Papers (1)
| | PDF (396 KB)

The authors extend previous results (Dubey and Taylor, 1986) on an optimum receiver structure for receiving quaternary phase-shift keyed signals over a digital satellite communications channel, to include the effects of filtering following the nonlinear satellite transponder. The error performance of the receiver at low signal-to-noise ratios (SNR) is evaluated by computer simulation. An upper bou... View full abstract»

• ### Simplified error bound analysis for M-DPSK in fading channels with diversity reception

Publication Year: 1994, Page(s):341 - 350
Cited by:  Papers (13)
| | PDF (588 KB)

An extremely tight upper bound symbol error probability is developed for M-DPSK over a Rician channel, incorporating the effects of AWGN, fading bandwidth and fixed Doppler shift (for the line-of-sight component). In addition, the error probability has also been determined in the above channels with the use of post-detection diversity combining. The bounds are shown to be in excellent agreement wi... View full abstract»

• ### Error performance for diversity DS-SSMA communications in fading channels

Publication Year: 1994, Page(s):357 - 363
Cited by:  Papers (14)
| | PDF (484 KB)

The average error probability for asynchronous direct sequence spread spectrum multiple access communications through slow Rician or Nakagami fading channels is evaluated for non-diversity and diversity receptions. The moments of the self-interference and the multiple access interferences are used to evaluate the average error probability by the Gauss quadrature rule. Diversity techniques and erro... View full abstract»